CN111676419A - Method for preparing S355MC steel coil based on multi-mode sheet billet continuous casting and rolling production line and product thereof - Google Patents
Method for preparing S355MC steel coil based on multi-mode sheet billet continuous casting and rolling production line and product thereof Download PDFInfo
- Publication number
- CN111676419A CN111676419A CN202010395183.7A CN202010395183A CN111676419A CN 111676419 A CN111676419 A CN 111676419A CN 202010395183 A CN202010395183 A CN 202010395183A CN 111676419 A CN111676419 A CN 111676419A
- Authority
- CN
- China
- Prior art keywords
- rolling
- mode
- continuous casting
- steel
- production line
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
- B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/06—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing of strip material
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Metal Rolling (AREA)
Abstract
The invention belongs to the technical field of metal material processing and steel, and particularly relates to a method for preparing an S355MC steel coil based on a multi-mode thin slab continuous casting and rolling production line and a product thereof. The method for preparing the S355MC steel coil based on the multi-mode sheet billet continuous casting and rolling production line comprises the following steps: smelting and continuously casting to obtain a steel slab, and sequentially carrying out heating treatment, descaling before rough rolling, electromagnetic induction heating, descaling before finish rolling, laminar cooling, coiling and cooling on the steel slab to obtain an S355MC steel coil; wherein, by mass percent, the steel slab comprises: 0.03-0.15% of C, less than or equal to 0.05% of Si, 0.6-1.5% of Mn, 0.02-0.35% of Al, less than or equal to 0.010% of P, less than or equal to 0.005% of S, 0.01-0.10% of Nb, less than or equal to 0.005% of N, and the balance of iron and inevitable impurities. The preparation method of the S355MC steel coil expands the thickness range of the final product S355MC steel coil, and has the advantages of short production line, short process, energy conservation, emission reduction and cost reduction.
Description
Technical Field
The invention belongs to the technical field of metal material processing and steel, and particularly relates to a method for preparing an S355MC steel coil based on a multi-mode thin slab continuous casting and rolling production line and a product thereof.
Background
At present, driven by factors of cost reduction, energy conservation and emission reduction, flow shortening, efficiency improvement and the like, the market demand for high-performance thin hot-rolled strip steel is continuously increased, and the endless rolling technology has remarkable effects on the aspects of improving the product proportion, the yield, the size and shape precision and the tissue performance uniformity of ultrathin strip steel, reducing energy consumption and roll consumption, saving energy and reducing emission.
The high-strength steel becomes a new-generation environment-friendly material because the high-strength steel can meet the requirements of safety and use and can achieve the purposes of weight reduction, energy conservation and emission reduction, and is widely applied to the fields of engineering machinery, automobile manufacturing, container manufacturing and the like. In this context, a thin slab continuous casting and rolling line can produce thin hot rolled strip having a thickness of about 0.8 mm. The thin hot-rolled strip steel has excellent comprehensive performance, can replace a cold-rolled plate after acid cleaning, and reduces the construction investment, energy consumption and environmental pollution of a cold-rolling process.
However, the thickness range of the product of the S355MC steel coil prepared by the current thin slab continuous casting and rolling production line is too narrow, the achievable rolling mode is limited, the production line is too long, the flow is too long, and the production line has no advantages in terms of energy saving, emission reduction and life cycle.
Disclosure of Invention
In view of the above problems, the present invention provides a method for manufacturing a steel coil S355MC based on a multi-mode thin slab continuous casting and rolling production line, and a product thereof. The invention prepares the S355MC steel coil based on the multi-mode thin slab continuous casting and rolling production line, and the difference between the multi-mode thin slab continuous casting and rolling production line and the conventional thin slab continuous casting and rolling production line is that: the roller-hearth tunnel soaking pit is arranged between the outlet of the continuous casting machine and rough rolling of the multi-mode sheet billet continuous casting and rolling production line and comprises a fixed section and a movable section, so that the roller-hearth tunnel soaking pit has the offline function of a steel slab, and can realize multi-mode operation in a single-slab rolling mode, a semi-automatic endless rolling mode or a full-automatic endless rolling mode, thereby expanding the thickness range of a final product S355MC steel coil (the thickness of the S355MC steel coil obtained by the invention can be 0.8-12.7mm), and the multi-mode sheet billet continuous casting and rolling production line has the advantages of short production line, short process, energy conservation, emission reduction and cost reduction.
The technical scheme for realizing the purpose is as follows:
the invention provides a method for preparing an S355MC steel coil based on a multi-mode thin slab continuous casting and rolling production line, which comprises the following steps: smelting and continuously casting to obtain a steel slab, and sequentially carrying out heating treatment, descaling before rough rolling, electromagnetic induction heating, descaling before finish rolling, laminar cooling, coiling and cooling on the steel slab to obtain an S355MC steel coil;
wherein, by mass percent, the steel slab comprises: 0.03-0.15% of C, less than or equal to 0.05% of Si, 0.6-1.5% of Mn, 0.02-0.35% of Al, less than or equal to 0.010% of P, less than or equal to 0.005% of S, 0.01-0.10% of Nb, less than or equal to 0.005% of N, and the balance of iron and inevitable impurities.
In one embodiment, in the method for manufacturing a steel coil S355MC based on the multi-mode thin slab continuous casting and rolling production line, the multi-mode thin slab continuous casting and rolling production line adopts a rolling mode selected from one or more than two of a single slab rolling mode, a semi-automatic endless rolling mode or a full-automatic endless rolling mode;
in a preferred embodiment, in the method for manufacturing the S355MC steel coil based on the multi-mode thin slab continuous casting and rolling production line, the length of the multi-mode thin slab continuous casting and rolling production line is 280-290 meters.
In one embodiment, in the method for manufacturing a steel coil S355MC based on the multi-mode thin slab continuous casting and rolling production line, the steel slab comprises, by mass percent: 0.11% of C, 0.03% of Si, 0.9% of Mn, 0.02% of Al, 0.009% of P, 0.002% of S, 0.08% of Nb, 0.003% of N, and the balance of iron and inevitable impurities;
in a preferred embodiment, in the method for manufacturing a steel coil S355MC based on a multi-mode thin slab continuous casting and rolling production line, the smelting and the continuous casting are performed to obtain a steel slab, and the method comprises the following steps: and sequentially carrying out KR desulfurization treatment, converter smelting, LF refining, VD refining and continuous casting on the molten iron to obtain a steel slab.
In the invention, molten iron is subjected to KR desulfurization pretreatment and converter smelting processes, LF and VD double refining treatment is adopted to obtain molten steel with required components, and the steel plate blank with the required components is obtained through continuous casting.
In one embodiment, in the method for manufacturing a steel coil S355MC based on the multi-mode thin slab continuous casting and rolling production line, the continuous casting speed is 3.5-6.5 m/min; the thickness of the steel plate blank is 110-123 mm;
in a preferred embodiment, in the method for manufacturing a steel coil S355MC based on the multi-mode thin slab continuous casting and rolling production line, when the thin slab continuous casting and rolling production line adopts the single slab rolling mode, the continuous casting speed is 3.5-4.5 m/min;
in a preferred embodiment, in the method for manufacturing a coil of S355MC steel based on the multi-mode thin slab continuous casting and rolling line, when the thin slab continuous casting and rolling line rolls in the semi-automatic endless rolling mode or the full-automatic endless rolling mode, the continuous casting speed is 4.5-6.5 m/min.
In one embodiment, the method for manufacturing a steel coil S355MC based on a multi-mode thin slab continuous casting and rolling production line according to the present invention, wherein the heating the steel slab includes: carrying out heating treatment on the steel plate blank by using a roller hearth type tunnel soaking pit furnace; wherein the temperature of the heating treatment is 1150-1200 ℃; the temperature of the heating treatment is to ensure that the carbonitrides of the alloy elements in the coil of S355MC steel according to the present invention are sufficiently dissolved and the austenite is more uniform.
In one embodiment, in the method for preparing the steel coil S355MC based on the multi-mode thin slab continuous casting and rolling production line, the roller-hearth tunnel soaking pit comprises a fixed section and a movable section, wherein the fixed section has a length of 50-55 meters; the length of the moving section is 25-30 meters.
The invention adopts the roller hearth type tunnel soaking pit furnace to carry out the heating treatment, and has the following advantages: (1) the temperature of the corners of the steel plate is improved, the uniformity of the width temperature of the steel plate is improved, the control of the plate type of the steel plate is facilitated, the uniformity of the performance of the steel plate is improved, and the edge defects of the steel plate are eliminated; (2) providing buffering time for roller replacement during heating; (3) the multi-mode rolling can be realized, the thickness range of products is expanded, and the thickness of the obtained S355MC steel coil is 0.8-12.7 mm.
In one embodiment, in the method for preparing the S355MC steel coil based on the multi-mode thin slab continuous casting and rolling production line, the descaling pressure is more than or equal to 30MPa in the descaling process before rough rolling;
the inlet temperature of the rough rolling is more than or equal to 1150 ℃, and the finish rolling temperature of the rough rolling is 930-1000 ℃;
in a preferred embodiment, in the method for preparing the steel coil S355MC based on the multi-mode thin slab continuous casting and rolling production line, the inlet temperature of rough rolling is 1150-1190 ℃, and the finish rolling temperature of rough rolling is 960-980 ℃.
In a preferred embodiment, in the method for preparing the S355MC steel coil based on the multi-mode thin slab continuous casting and rolling production line, the outlet temperature of the electromagnetic induction heating is 1050-.
In one embodiment, in the method for manufacturing a steel coil S355MC based on the multi-mode thin slab continuous casting and rolling production line, the descaling mode is double-row descaling or single-row descaling; the dephosphorization pressure is more than or equal to 30 MPa;
in a preferred embodiment, in the method for preparing the S355MC steel coil based on the multi-mode thin slab continuous casting and rolling production line, when the thin slab continuous casting and rolling production line adopts the single slab rolling mode, in the process of descaling before finish rolling, the mode of dephosphorization is double-row dephosphorization, a descaler adopts a double-row header, and the pressure of the double-row header is more than or equal to 30 MPa;
in a preferred embodiment, in the method for preparing the S355MC steel coil based on the multi-mode thin slab continuous casting and rolling production line, when the semi-automatic endless rolling mode or the full-automatic endless rolling mode is adopted by the thin slab continuous casting and rolling production line, in the process of removing the scale before finish rolling, the mode of removing the phosphorus is single-row phosphorus, a single-row header is adopted by the descaling machine, and the pressure of the single-row header is greater than or equal to 30 MPa.
The invention adopts two-pass descaling process before rough rolling and finish rolling, thereby ensuring the surface quality of the strip steel.
In one embodiment, in the method for manufacturing the steel coil S355MC based on the multi-mode thin slab continuous casting and rolling production line, the distance between the descaling nozzle and the steel slab is 60-110mm in the descaling process before finish rolling; the distance between the descaling nozzle and the steel plate blank is adjusted according to the thickness of the steel plate blank.
In a preferred embodiment, in the method for preparing the steel coil S355MC based on the multi-mode thin slab continuous casting and rolling production line, the inlet temperature of the finish rolling is 950-1060 ℃; the finish rolling temperature of the finish rolling is 820-880 ℃; the total reduction rate of finish rolling is 70-80%; the coiling temperature is 550-620 ℃; the cooling mode is air cooling (air cooling) until the temperature is 18-31 ℃.
The method adopts laminar cooling after finish rolling, and the coiling temperature is adjusted according to the required thickness of the strip steel, so that the S355MC hot rolled steel coil with excellent comprehensive performance can be finally obtained.
The rough rolling adopts irreversible 3-pass rolling, the finish rolling adopts 5-pass rolling, and the steel plate blank after the rough rolling adopts electromagnetic induction heating equipment to heat the steel plate blank.
According to the invention, the intermediate steel plate blank is heated by adopting an electromagnetic induction heating mode before finish rolling, so that the operation of rough rolling and finish rolling temperature can be ensured, the carbonitride of Nb is formed in the rough rolling process for redissolution, and Nb is separated out again in the finish rolling stage, thereby refining austenite grains and ferrite grains of a final product steel coil.
In one embodiment, in the method for manufacturing the S355MC steel coil based on the multi-mode thin slab continuous casting and rolling production line, when the thin slab continuous casting and rolling production line adopts the single slab rolling mode, the thickness of the S355MC steel coil is 4.0-12.7 mm;
when the sheet billet continuous casting and rolling production line adopts the semi-automatic endless rolling mode or the full-automatic endless rolling mode, the thickness of the S355MC steel coil is 2.0-4.0 mm;
when the sheet billet continuous casting and rolling production line adopts the full-automatic endless rolling mode, the thickness of the S355MC steel coil is 0.8-2.0 mm.
The invention also provides an S355MC steel coil prepared by the method for preparing the S355MC steel coil based on the multi-mode thin slab continuous casting and rolling production line;
wherein, the S355MC steel coil comprises the following components in percentage by mass: 0.03-0.15% of C, less than or equal to 0.05% of Si, 0.6-1.5% of Mn, 0.02-0.35% of Al, less than or equal to 0.010% of P, less than or equal to 0.005% of S, 0.01-0.10% of Nb, less than or equal to 0.005% of N, and the balance of iron and inevitable impurities;
the thickness of the S355MC steel coil is 0.8-12.7 mm.
In one embodiment, in the S355MC steel coil prepared by the method for preparing the S355MC steel coil based on the multi-mode thin slab continuous casting and rolling production line, the S355MC steel coil comprises, by mass percent: 0.11% of C, 0.03% of Si, 0.9% of Mn, 0.02% of Al, 0.009% of P, 0.002% of S, 0.08% of Nb, 0.003% of N, and the balance of iron and inevitable impurities.
In one embodiment, the longitudinal yield strength of the S355MC steel coil prepared by the method for preparing the S355MC steel coil based on the multi-mode thin slab continuous casting and rolling production line is 360-400MPa, the tensile strength is 466-500MPa, the elongation is not less than 28%, and no crack is formed on the surface of the steel plate with the cold bending d-0 a bending angle of 180 degrees.
The total length of the multi-mode thin slab continuous casting and rolling production line is only 280-290 meters, while the total length of the thick slab hot continuous rolling production line in the prior art is 700-1000 meters, even the total length of the short-flow CSP production line is 430 meters. Therefore, the multi-mode sheet billet continuous casting and rolling production line has the advantages of greatly shortened total length, short production line, short flow, energy conservation, emission reduction and cost reduction. In addition, compared with the existing production line, the energy consumption of each ton of steel of the unit used by the multi-mode sheet billet continuous casting and rolling production line is reduced by 49-62.5%, and the multi-mode sheet billet continuous casting and rolling production line has an important effect on reducing the emission of greenhouse gases of iron and steel production enterprises.
The concept of selecting the components and the contents of the alloying elements in the S355MC steel coil is as follows:
in the embodiment of the present invention, the C element is the most important alloying element in the steel and is one of the elements that most economically improve the strength. Wherein, C atoms are limitedly and fixedly dissolved in gamma-Fe, a gamma phase region is enlarged, the influence on the microstructure and the performance of steel is great, and the main control effect on the strength and the hardness is played. In addition, C can form carbonitride with microalloy elements, and the comprehensive performance of the steel is adjusted in a large range. If the C content in the steel is too high, a band-shaped structure is easily formed during slab smelting and rolling, and the band-shaped structure adversely affects cold formability and fatigue properties of the steel sheet. In addition, the C content is too high, which is quite disadvantageous to the weldability of the steel material. However, if the C content is too low, the difficulty of smelting increases. According to the invention, through repeated optimization tests, the content range of C in the steel plate is limited to 0.03-0.15%, and more preferably 0.11%.
The inventors have recognized that the Si element mainly affects the surface quality of hot rolled steel strip, pickled steel sheet and strip, and that the increase of the Si content in steel causes a sharp increase in the thickness of the coating according to the santellin effect. Repeated optimization tests show that when the content of Si is controlled to be less than or equal to 0.05 percent, the coating structure of the product is basically not influenced by Si, a bright coating with normal thickness can be obtained, and the surface quality of the strip steel is greatly ensured.
The inventors have also recognized that Mn and Fe can be substituted for each other and belong to substitutional solute atoms in an iron-based solid solution, and that Mn has a good solid solution strengthening effect, and can refine grains, improve strength, become an austenite-forming element, and expand a single austenite phase region, and further, Mn can significantly lower the temperature of γ → α transition, and enable A1The point is lowered, thereby achieving the effect of refining ferrite grains. In the present invention, the Mn content is designed mainly from the aspects of performance requirements and production cost. In terms of production cost, Mn is the most economical alloy for enlarging the austenitic regionAnd meanwhile, Mn and S can form MnS, so that the sulfide form in the test steel is improved. However, too high Mn content as an alloying element increases the production cost of the test steel. According to the invention, through repeated optimization tests, the Mn content is finally limited to 0.6-1.5%, and the Mn content is further preferably 0.9%.
It is also considered by the inventors that too high amounts of S, P and N elements in the steel adversely affect the plasticity, toughness and fatigue properties of the steel material. Therefore, the present invention defines S.ltoreq.0.005%, P.ltoreq.0.010%, N.ltoreq.0.005%, and more preferably S is 0.002%, P is 0.009%, and N is 0.003%.
The Nb element is one of key strengthening elements in steel, and has various strengthening mechanisms such as solid solution strengthening and precipitation in a thermomechanical process. Solid-soluted Nb can significantly increase the dynamic recrystallization temperature of steel, thereby promoting deformation by non-zone rolling to induce the generation of ferrite and precipitates. Among them, the dispersed precipitates of Nb strengthen the matrix by dragging the dislocations, and also refine the crystal grains by pinning the grain boundaries, thereby improving the steel strength. In addition, Nb can also ensure the refinement of weld joint structure and improve the strength after welding. However, considering the cost factor, too high Nb content increases the production cost of the material. Therefore, the content of Nb is limited to 0.01 to 0.10%, and more preferably 0.08%.
Al element is one of effective deoxidizing elements, and can form nitrides to refine grains. Among them, too high content of Al element impairs toughness of steel and also deteriorates toughness of weld heat affected zone. According to the invention, the Al content is finally limited to 0.02-0.35%, and more preferably 0.02% through comprehensive consideration and a balance optimization test.
One or more technical embodiments of the present invention have at least the following technical effects or advantages:
(1) the roller-hearth tunnel soaking pit is arranged between the outlet of the continuous casting machine and rough rolling of the multi-mode sheet billet continuous casting and rolling production line, comprises a fixed section and a movable section, has the function of lower limit of a steel slab, and can realize multi-modes of a single-slab rolling mode, a semi-automatic endless rolling mode or a full-automatic endless rolling mode, so that the thickness range of a final product is expanded, and the multi-mode sheet billet continuous casting and rolling production line has the advantages of short production line, short flow, energy conservation, emission reduction and cost reduction, and the thickness of an S355MC steel coil obtained by the invention can be 0.8-12.7 mm.
(2) The total length of the multi-mode sheet billet continuous casting and rolling production line is only 280-290 meters, and the multi-mode sheet billet continuous casting and rolling production line has the advantages of short production line, short flow, energy conservation, emission reduction and cost reduction.
(3) Compared with the existing production line, the energy consumption of each ton of steel of the unit used by the multi-mode sheet billet continuous casting and rolling production line is reduced by 49-62.5%, and the multi-mode sheet billet continuous casting and rolling production line has an important effect on reducing the emission of greenhouse gases of iron and steel production enterprises.
(4) The invention is based on the production line of multi-mode sheet billet continuous casting and rolling to produce S355MC hot rolled steel coils. The steel coil mainly adopts a C-Si-Mn-Nb component system in component design, and the system depends on the solid solution strengthening of C, Mn element and the fine crystal strengthening of Nb; in addition, in the continuous casting and rolling process, a rough rolling and finish rolling two-pass descaling process is adopted, so that the surface quality of the strip steel is ensured; heating the intermediate steel plate blank by adopting an electromagnetic induction heating mode before finish rolling, ensuring the operation of finish rolling temperature, redissolving the carbonitride of Nb formed in the rough rolling process, and precipitating Nb again in the finish rolling stage, thereby refining austenite grains and ferrite grains of a final product steel coil; the method adopts laminar cooling after finish rolling, and the coiling temperature is adjusted according to the required thickness of the strip steel, so that the S355MC hot rolled steel coil with excellent comprehensive performance can be finally obtained.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a flow chart illustrating a method for manufacturing a steel coil S355MC based on a multi-mode thin slab continuous casting and rolling production line according to the present invention;
fig. 2 shows a metallographic picture of a coil of S355MC steel produced on the basis of a multi-mode thin slab continuous casting and rolling line according to the present invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
In order to solve the technical problems, the embodiment of the invention provides the following general ideas:
the invention provides a method for preparing an S355MC steel coil based on a multi-mode thin slab continuous casting and rolling production line, which comprises the following steps: smelting and continuously casting to obtain a steel slab, and sequentially carrying out heating treatment, descaling before rough rolling, electromagnetic induction heating, descaling before finish rolling, laminar cooling, coiling and cooling on the steel slab to obtain an S355MC steel coil;
wherein, by mass percent, the steel slab comprises: 0.03-0.15% of C, less than or equal to 0.05% of Si, 0.6-1.5% of Mn, 0.02-0.35% of Al, less than or equal to 0.010% of P, less than or equal to 0.005% of S, 0.01-0.10% of Nb, less than or equal to 0.005% of N, and the balance of iron and inevitable impurities.
In one embodiment, in the method for manufacturing a steel coil S355MC based on the multi-mode thin slab continuous casting and rolling production line, the multi-mode thin slab continuous casting and rolling production line adopts a rolling mode selected from one or more than two of a single slab rolling mode, a semi-automatic endless rolling mode or a full-automatic endless rolling mode;
in a preferred embodiment, in the method for manufacturing the S355MC steel coil based on the multi-mode thin slab continuous casting and rolling production line, the length of the multi-mode thin slab continuous casting and rolling production line is 280-290 meters.
In one embodiment, in the method for manufacturing a steel coil S355MC based on the multi-mode thin slab continuous casting and rolling production line, the steel slab comprises, by mass percent: 0.11% of C, 0.03% of Si, 0.9% of Mn, 0.02% of Al, 0.009% of P, 0.002% of S, 0.08% of Nb, 0.003% of N, and the balance of iron and inevitable impurities;
in a preferred embodiment, in the method for manufacturing a steel coil S355MC based on a multi-mode thin slab continuous casting and rolling production line, the smelting and the continuous casting are performed to obtain a steel slab, and the method comprises the following steps: and sequentially carrying out KR desulfurization treatment, converter smelting, LF refining, VD refining and continuous casting on the molten iron to obtain a steel slab.
In one embodiment, in the method for manufacturing a steel coil S355MC based on the multi-mode thin slab continuous casting and rolling production line, the continuous casting speed is 3.5-6.5 m/min; the thickness of the steel plate blank is 110-123 mm;
in a preferred embodiment, in the method for manufacturing a steel coil S355MC based on the multi-mode thin slab continuous casting and rolling production line, when the thin slab continuous casting and rolling production line adopts the single slab rolling mode, the continuous casting speed is 3.5-4.5 m/min;
in a preferred embodiment, in the method for manufacturing a coil of S355MC steel based on the multi-mode thin slab continuous casting and rolling line, when the thin slab continuous casting and rolling line rolls in the semi-automatic endless rolling mode or the full-automatic endless rolling mode, the continuous casting speed is 4.5-6.5 m/min.
In one embodiment, the method for manufacturing a steel coil S355MC based on a multi-mode thin slab continuous casting and rolling production line according to the present invention, wherein the heating the steel slab includes: carrying out heating treatment on the steel plate blank by using a roller hearth type tunnel soaking pit furnace;
in one embodiment, in the method for preparing the steel coil S355MC based on the multi-mode thin slab continuous casting and rolling production line, the roller-hearth tunnel soaking pit comprises a fixed section and a movable section, wherein the fixed section has a length of 50-55 meters; the length of the moving section is 25-30 meters.
In one embodiment, in the method for preparing the S355MC steel coil based on the multi-mode thin slab continuous casting and rolling production line, the descaling pressure is more than or equal to 30MPa in the descaling process before rough rolling;
the inlet temperature of the rough rolling is more than or equal to 1150 ℃, and the finish rolling temperature of the rough rolling is 930-1000 ℃;
in a preferred embodiment, in the method for preparing the steel coil S355MC based on the multi-mode thin slab continuous casting and rolling production line, the inlet temperature of rough rolling is 1150-1190 ℃, and the finish rolling temperature of rough rolling is 960-980 ℃.
In a preferred embodiment, in the method for preparing the S355MC steel coil based on the multi-mode thin slab continuous casting and rolling production line, the outlet temperature of the electromagnetic induction heating is 1050-.
In one embodiment, in the method for manufacturing a steel coil S355MC based on the multi-mode thin slab continuous casting and rolling production line, the descaling mode is double-row descaling or single-row descaling; the dephosphorization pressure is more than or equal to 30 MPa;
in a preferred embodiment, in the method for preparing the S355MC steel coil based on the multi-mode thin slab continuous casting and rolling production line, when the thin slab continuous casting and rolling production line adopts the single slab rolling mode, in the process of descaling before finish rolling, the mode of dephosphorization is double-row dephosphorization, a descaler adopts a double-row header, and the pressure of the double-row header is more than or equal to 30 MPa;
in a preferred embodiment, in the method for preparing the S355MC steel coil based on the multi-mode thin slab continuous casting and rolling production line, when the semi-automatic endless rolling mode or the full-automatic endless rolling mode is adopted by the thin slab continuous casting and rolling production line, in the process of removing the scale before finish rolling, the mode of removing the phosphorus is single-row phosphorus, a single-row header is adopted by the descaling machine, and the pressure of the single-row header is greater than or equal to 30 MPa.
In one embodiment, in the method for manufacturing the steel coil S355MC based on the multi-mode thin slab continuous casting and rolling production line, the distance between the descaling nozzle and the steel slab is 60-110mm in the descaling process before finish rolling;
in a preferred embodiment, in the method for preparing the steel coil S355MC based on the multi-mode thin slab continuous casting and rolling production line, the inlet temperature of the finish rolling is 950-1060 ℃; the finish rolling temperature of the finish rolling is 820-880 ℃; the total reduction rate of finish rolling is 70-80%; the coiling temperature is 550-620 ℃; the cooling mode is air cooling (air cooling) until the temperature is 18-31 ℃.
The method adopts laminar cooling after finish rolling, and the coiling temperature is adjusted according to the required thickness of the strip steel, so that the S355MC hot rolled steel coil with excellent comprehensive performance can be finally obtained.
The rough rolling adopts irreversible 3-pass rolling, the finish rolling adopts 5-pass rolling, and the steel plate blank after the rough rolling adopts electromagnetic induction heating equipment to heat the steel plate blank.
According to the invention, the intermediate steel plate blank is heated by adopting an electromagnetic induction heating mode before finish rolling, so that the operation of rough rolling and finish rolling temperature can be ensured, the carbonitride of Nb is formed in the rough rolling process for redissolution, and Nb is separated out again in the finish rolling stage, thereby refining austenite grains and ferrite grains of a final product steel coil.
In one embodiment, in the method for manufacturing the S355MC steel coil based on the multi-mode thin slab continuous casting and rolling production line, when the thin slab continuous casting and rolling production line adopts the single slab rolling mode, the thickness of the S355MC steel coil is 4.0-12.7 mm;
when the sheet billet continuous casting and rolling production line adopts the semi-automatic endless rolling mode or the full-automatic endless rolling mode, the thickness of the S355MC steel coil is 2.0-4.0 mm;
when the sheet billet continuous casting and rolling production line adopts the full-automatic endless rolling mode, the thickness of the S355MC steel coil is 0.8-2.0 mm.
The invention also provides an S355MC steel coil prepared by the method for preparing the S355MC steel coil based on the multi-mode thin slab continuous casting and rolling production line;
wherein, the S355MC steel coil comprises the following components in percentage by mass: 0.03-0.15% of C, less than or equal to 0.05% of Si, 0.6-1.5% of Mn, 0.02-0.35% of Al, less than or equal to 0.010% of P, less than or equal to 0.005% of S, 0.01-0.10% of Nb, less than or equal to 0.005% of N, and the balance of iron and inevitable impurities;
the thickness of the S355MC steel coil is 0.8-12.7 mm.
In one embodiment, in the S355MC steel coil prepared by the method for preparing the S355MC steel coil based on the multi-mode thin slab continuous casting and rolling production line, the S355MC steel coil comprises, by mass percent: 0.11% of C, 0.03% of Si, 0.9% of Mn, 0.02% of Al, 0.009% of P, 0.002% of S, 0.08% of Nb, 0.003% of N, and the balance of iron and inevitable impurities.
In one embodiment, the longitudinal yield strength of the S355MC steel coil prepared by the method for preparing the S355MC steel coil based on the multi-mode thin slab continuous casting and rolling production line is 360-400MPa, the tensile strength is 466-500MPa, the elongation is not less than 28%, and no crack is formed on the surface of the steel plate with the cold bending d-0 a bending angle of 180 degrees.
The preparation of the steel coil S355MC based on the multi-mode thin slab continuous casting and rolling line according to the present application will be described in detail with reference to examples, comparative examples and experimental data.
Example 1:
in the embodiment, 9 test groups are adopted, and in the test groups 1 to 9, the preparation method based on the multi-mode thin slab continuous casting and rolling production line is adopted to prepare the S355MC steel coil;
firstly, sequentially carrying out KR desulfurization treatment, converter smelting, LF refining, VD refining and continuous casting on molten iron to obtain a steel plate blank, wherein the steel plate blank comprises the chemical components shown in the table 1 in percentage by mass;
table 1: the steel slab comprises the chemical components
| Serial number | C(％) | Si(％) | Mn(％) | Al(％) | P(％) | S(％) | Nb(％) | N(％) |
| Test group 1 | 0.03 | 0.032 | 0.75 | 0.035 | 0.009 | 0.0020 | 0.01 | 0.004 |
| Test group 2 | 0.038 | 0.035 | 0.60 | 0.030 | 0.008 | 0.0040 | 0.020 | 0.003 |
| Test group 3 | 0.040 | 0.030 | 0.78 | 0.042 | 0.01 | 0.0030 | 0.018 | 0.003 |
| Test group 4 | 0.11 | 0.03 | 0.9 | 0.02 | 0.009 | 0.0020 | 0.08 | 0.003 |
| Test group 5 | 0.045 | 0.031 | 0.81 | 0.044 | 0.007 | 0.0030 | 0.028 | 0.005 |
| Test group 6 | 0.055 | 0.021 | 0.90 | 0.034 | 0.005 | 0.0050 | 0.034 | 0.004 |
| Test group 7 | 0.10 | 0.05 | 1.22 | 0.032 | 0.01 | 0.0020 | 0.035 | 0.003 |
| Test group 8 | 0.13 | 0.037 | 1.31 | 0.35 | 0.008 | 0.0032 | 0.038 | 0.004 |
| Test group 9 | 0.15 | 0.032 | 1.50 | 0.25 | 0.008 | 0.0038 | 0.1 | 0.004 |
Secondly, the S355MC steel coil was prepared according to the following process, and the specific preparation process parameters of the 9 test groups in this example are shown in tables 2 and 3:
sequentially carrying out heating treatment, descaling before rough rolling, electromagnetic induction heating, descaling before finish rolling, laminar cooling, coiling and cooling on the steel plate blank obtained in the first step; the method specifically comprises the following steps:
(1) in the continuous casting process, the drawing speed of the continuous casting is 3.5-6.5 m/min; the thickness of the steel plate blank is 110-123 mm; when the thin slab continuous casting and rolling production line adopts a single slab rolling mode, the drawing speed of the continuous casting is 3.5-4.5 m/min; when the thin slab continuous casting and rolling production line adopts a semi-automatic endless rolling mode or a full-automatic endless rolling mode for rolling, the drawing speed of the continuous casting is 4.5-6.5 m/min.
(2) Carrying out heating treatment on the steel plate blank obtained in the step (1) by using a roller-hearth tunnel soaking pit furnace; wherein the temperature of the heating treatment is 1150-1200 ℃. The roller-hearth tunnel soaking pit furnace comprises a fixed section and a movable section, wherein the fixed section is 50-55 meters in length; the length of the moving section is 25-30 meters.
(3) Descaling the steel plate blank obtained in the step (2) under the condition that the pressure of the descaling is more than or equal to 30MPa in the descaling process before rough rolling; the inlet temperature of the rough rolling is more than or equal to 1150 ℃, and the finish rolling temperature of the rough rolling is 930-1000 ℃; the inlet temperature of the rough rolling is 1150-1190 ℃, and the final rolling temperature of the rough rolling is 960-980 ℃; in the process of electromagnetic induction heating, the outlet temperature of the electromagnetic induction heating is 1050-1250 ℃; the descaling mode is double-row descaling or single-row descaling; the dephosphorization pressure is more than or equal to 30 MPa; when the thin slab continuous casting and rolling production line adopts the single slab rolling mode, in the descaling process before finish rolling, the descaling mode is double-row dephosphorization, a descaler adopts a double-row header, and the pressure of the double-row header is more than or equal to 30 MPa; when the semi-automatic endless rolling mode or the full-automatic endless rolling mode is adopted by the thin slab continuous casting and rolling production line, in the descaling process before finish rolling, the dephosphorization mode is single-row dephosphorization, a single-row header is adopted by a descaler, and the pressure of the single-row header is more than or equal to 30 MPa. In the descaling process before finish rolling, the distance between the descaling nozzle and the steel plate blank is 60-110 mm; the inlet temperature of the finish rolling is 950-1060 ℃; the finish rolling temperature of the finish rolling is 820-880 ℃; the total reduction rate of finish rolling is 70-80%; the coiling temperature is 550-620 ℃; the cooling mode is that air is cooled to 18-31 ℃.
When the thin slab continuous casting and rolling production line adopts a single slab rolling mode, the thickness of the prepared S355MC steel coil is 4.0-12.7 mm; when the thin slab continuous casting and rolling production line adopts a semi-automatic endless rolling mode or a full-automatic endless rolling mode, the thickness of the S355MC steel coil is 2.0-4.0 mm; when the thin slab continuous casting and rolling production line adopts a full-automatic endless rolling mode, the thickness of the S355MC steel coil is 0.8-2.0 mm.
The S355MC steel coil prepared by the invention comprises: 0.03-0.15% of C, less than or equal to 0.05% of Si, 0.6-1.5% of Mn, 0.02-0.35% of Al, less than or equal to 0.010% of P, less than or equal to 0.005% of S, 0.01-0.10% of Nb, less than or equal to 0.005% of N, and the balance of iron and inevitable impurities; further preferably, the S355MC steel coil comprises, by mass percent: 0.11% of C, 0.03% of Si, 0.9% of Mn, 0.02% of Al, 0.009% of P, 0.002% of S, 0.08% of Nb, 0.003% of N, and the balance of iron and inevitable impurities.
The thickness of the S355MC steel coil prepared by the invention is 0.8-12.7 mm.
Table 2: technological parameters of the preparation method of the invention
Table 3: technological parameters of the preparation method of the invention
Mechanical property tests are respectively carried out on the S355MC steel coils prepared in the test groups 1-9, and the comparison results are shown in Table 4:
table 4: results of mechanical Property testing
The data show that the longitudinal yield strength of the S355MC steel coil prepared by the preparation method is 360-400MPa, the tensile strength is 466-500MPa, the elongation is not less than 28%, no crack is formed on the surface of the steel plate with the bending angle of 0a being 180 degrees, and the cold forming performance is excellent.
The total length of the multi-mode thin slab continuous casting and rolling production line is only 280-290 meters, while the total length of the thick slab hot continuous rolling production line in the prior art is 700-1000 meters, even the total length of the short-flow CSP production line is 430 meters. The multi-mode sheet billet continuous casting and rolling production line has the advantages of greatly shortened total length, short production line, short flow, energy conservation, emission reduction and cost reduction. In addition, compared with the existing production line, the energy consumption of each ton of steel of the unit of the multi-mode sheet billet continuous casting and rolling production line is reduced by 49-62.5%, and the unit plays an important role in reducing the emission of greenhouse gases of iron and steel production enterprises.
The invention adopts the roller hearth type tunnel soaking pit furnace to carry out the heating treatment, and has the following advantages: (1) the temperature of the corners of the steel plate is improved, the uniformity of the width temperature of the steel plate is improved, the control of the plate type of the steel plate is facilitated, the uniformity of the performance of the steel plate is improved, and the edge defects of the steel plate are eliminated; (2) providing buffering time for roller replacement during heating; (3) the multi-mode rolling can be realized, the thickness range of products is expanded, and the thickness of the obtained S500MC steel coil is 0.8-12.7 mm.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.
Claims (10)
1. A method for manufacturing S355MC steel coils based on a multi-mode thin slab continuous casting and rolling production line, the method comprising: smelting and continuously casting to obtain a steel slab, and sequentially carrying out heating treatment, descaling before rough rolling, electromagnetic induction heating, descaling before finish rolling, laminar cooling, coiling and cooling on the steel slab to obtain an S355MC steel coil;
wherein, by mass percent, the steel slab comprises: 0.03-0.15% of C, less than or equal to 0.05% of Si, 0.6-1.5% of Mn, 0.02-0.35% of Al, less than or equal to 0.010% of P, less than or equal to 0.005% of S, 0.01-0.10% of Nb, less than or equal to 0.005% of N, and the balance of iron and inevitable impurities.
2. The method for preparing S355MC steel coils based on the multi-mode thin slab continuous casting and rolling production line according to claim 1, wherein the multi-mode thin slab continuous casting and rolling production line adopts a rolling mode selected from one or more of a single slab rolling mode, a semi-automatic endless rolling mode or a full-automatic endless rolling mode;
preferably, the length of the multi-mode sheet billet continuous casting and rolling production line is 280-290 meters.
3. The method for manufacturing S355MC steel coils based on multi-mode thin slab continuous casting and rolling production line according to claim 1 or 2, wherein the steel slab comprises, in mass percent: 0.11% of C, 0.03% of Si, 0.9% of Mn, 0.02% of Al, 0.009% of P, 0.002% of S, 0.08% of Nb, 0.003% of N, and the balance of iron and inevitable impurities;
preferably, the smelting and the continuous casting are performed to obtain a steel slab, and the steel slab comprises: and sequentially carrying out KR desulfurization treatment, converter smelting, LF refining, VD refining and continuous casting on the molten iron to obtain a steel slab.
4. The method for preparing a coil of S355MC steel based on the multi-mode thin slab continuous casting and rolling production line as claimed in claim 1 or 2, wherein the continuous casting speed is 3.5-6.5 m/min; the thickness of the steel plate blank is 110-123 mm;
preferably, when the thin slab continuous casting and rolling production line adopts the single slab rolling mode, the continuous casting drawing speed is 3.5-4.5 m/min;
preferably, when the thin slab continuous casting and rolling production line adopts the semi-automatic endless rolling mode or the full-automatic endless rolling mode for rolling, the drawing speed of the continuous casting is 4.5-6.5 m/min;
preferably, the process of heating the steel slab includes: carrying out heating treatment on the steel plate blank by using a roller hearth type tunnel soaking pit furnace; wherein the temperature of the heating treatment is 1150-1200 ℃;
preferably, the roller hearth type tunnel soaking pit furnace comprises a fixed section and a movable section, wherein the length of the fixed section is 50-55 m; the length of the moving section is 25-30 meters.
5. The method for preparing the S355MC steel coil based on the multi-mode thin slab continuous casting and rolling production line according to claim 1 or 2, wherein the pressure of descaling is more than or equal to 30MPa in the descaling process before rough rolling;
the inlet temperature of the rough rolling is more than or equal to 1150 ℃, and the finish rolling temperature of the rough rolling is 930-1000 ℃;
preferably, the inlet temperature of the rough rolling is 1150-1190 ℃, and the finish rolling temperature of the rough rolling is 960-980 ℃;
preferably, during the electromagnetic induction heating, the outlet temperature of the electromagnetic induction heating is 1050-.
6. The method for manufacturing the steel coil S355MC based on the multi-mode thin slab continuous casting and rolling production line as claimed in claim 1 or 2, wherein the descaling mode is double-row descaling or single-row descaling; the dephosphorization pressure is more than or equal to 30 MPa;
preferably, when the thin slab continuous casting and rolling production line adopts the single slab rolling mode, in the descaling process before finish rolling, the dephosphorization mode is double-row dephosphorization, a descaler adopts a double-row header, and the pressure of the double-row header is more than or equal to 30 MPa;
preferably, when the semi-automatic endless rolling mode or the full-automatic endless rolling mode is adopted by the thin slab continuous casting and rolling production line, in the descaling process before finish rolling, the dephosphorization mode is single-row dephosphorization, a single-row header is adopted by a descaler, and the pressure of the single-row header is more than or equal to 30 MPa.
7. The method for manufacturing the coil of S355MC steel based on the multi-mode thin slab continuous casting and rolling production line of claim 6, wherein, in the descaling process before finish rolling, the distance between the descaling nozzle and the steel slab is 60-110 mm;
preferably, the inlet temperature of the finish rolling is 950-1060 ℃; the finish rolling temperature of the finish rolling is 820-880 ℃; the total reduction rate of finish rolling is 70-80%; the coiling temperature is 550-620 ℃; the cooling mode is air cooling to 18-31 ℃.
8. The method for manufacturing the coil of S355MC steel based on the multi-mode thin slab continuous casting and rolling production line as claimed in claim 1 or 2, wherein when the thin slab continuous casting and rolling production line adopts the single slab rolling mode, the thickness of the coil of S355MC steel is 4.0-12.7 mm;
when the sheet billet continuous casting and rolling production line adopts the semi-automatic endless rolling mode or the full-automatic endless rolling mode, the thickness of the S355MC steel coil is 2.0-4.0 mm;
when the sheet billet continuous casting and rolling production line adopts the full-automatic endless rolling mode, the thickness of the S355MC steel coil is 0.8-2.0 mm.
9. The coil of S355MC steel produced based on the method of producing a coil of S355MC steel according to any one of claims 1 to 8;
wherein, the S355MC steel coil comprises the following components in percentage by mass: 0.03-0.15% of C, less than or equal to 0.05% of Si, 0.6-1.5% of Mn, 0.02-0.35% of Al, less than or equal to 0.010% of P, less than or equal to 0.005% of S, 0.01-0.10% of Nb, less than or equal to 0.005% of N, and the balance of iron and inevitable impurities;
the thickness of the S355MC steel coil is 0.8-12.7 mm.
10. The steel coil S355MC according to claim 9, wherein the steel coil S355MC comprises, in mass percent: 0.11% of C, 0.03% of Si, 0.9% of Mn, 0.02% of Al, 0.009% of P, 0.002% of S, 0.08% of Nb, 0.003% of N, and the balance of iron and inevitable impurities.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010395183.7A CN111676419A (en) | 2020-05-12 | 2020-05-12 | Method for preparing S355MC steel coil based on multi-mode sheet billet continuous casting and rolling production line and product thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010395183.7A CN111676419A (en) | 2020-05-12 | 2020-05-12 | Method for preparing S355MC steel coil based on multi-mode sheet billet continuous casting and rolling production line and product thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111676419A true CN111676419A (en) | 2020-09-18 |
Family
ID=72433666
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010395183.7A Pending CN111676419A (en) | 2020-05-12 | 2020-05-12 | Method for preparing S355MC steel coil based on multi-mode sheet billet continuous casting and rolling production line and product thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111676419A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112695251A (en) * | 2020-12-21 | 2021-04-23 | 本钢板材股份有限公司 | Production method of thick seaside building structure steel S355G11M hot-rolled coil |
| CN113528940A (en) * | 2021-06-16 | 2021-10-22 | 首钢集团有限公司 | Aluminum-silicon alloy plating layer hot forming steel and preparation method thereof |
| CN114012056A (en) * | 2021-10-14 | 2022-02-08 | 首钢集团有限公司 | 1500 MPa-grade hot forming steel and preparation method thereof |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050115649A1 (en) * | 2003-03-27 | 2005-06-02 | Tokarz Christopher A. | Thermomechanical processing routes in compact strip production of high-strength low-alloy steel |
| CN1995431A (en) * | 2006-01-06 | 2007-07-11 | 鞍钢股份有限公司 | Method for medium sized or thin plate blank continuous casting and continuous rolling for producing superfine crystal grain steel plate and the steel plate |
| CN101293257A (en) * | 2007-04-25 | 2008-10-29 | 宝山钢铁股份有限公司 | Process for manufacturing hot rolled steel strips by using compaction type continuous casting and rolling technique |
| CN101391264A (en) * | 2007-09-19 | 2009-03-25 | 中冶赛迪工程技术股份有限公司 | Technique method of thin middle plate continuous casting and rolling production |
| KR20140085188A (en) * | 2012-12-27 | 2014-07-07 | 주식회사 포스코 | Method for manufacturing hot rolled steel plate and hot rolled steel sheet |
| CN106011421A (en) * | 2016-06-06 | 2016-10-12 | 日照宝华新材料有限公司 | Method for producing thin-specification S500MC steel based on ESP thin slab continuous casting and rolling process |
| CN106756508A (en) * | 2016-12-30 | 2017-05-31 | 日照宝华新材料有限公司 | The method that Thin Specs REH380LA steel is produced based on ESP bar strip continuous casting and rolling flow paths |
| CN106834887A (en) * | 2016-12-30 | 2017-06-13 | 日照宝华新材料有限公司 | The method that Thin Specs RE510L steel is produced based on ESP bar strip continuous casting and rolling flow paths |
-
2020
- 2020-05-12 CN CN202010395183.7A patent/CN111676419A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050115649A1 (en) * | 2003-03-27 | 2005-06-02 | Tokarz Christopher A. | Thermomechanical processing routes in compact strip production of high-strength low-alloy steel |
| CN1995431A (en) * | 2006-01-06 | 2007-07-11 | 鞍钢股份有限公司 | Method for medium sized or thin plate blank continuous casting and continuous rolling for producing superfine crystal grain steel plate and the steel plate |
| CN101293257A (en) * | 2007-04-25 | 2008-10-29 | 宝山钢铁股份有限公司 | Process for manufacturing hot rolled steel strips by using compaction type continuous casting and rolling technique |
| CN101391264A (en) * | 2007-09-19 | 2009-03-25 | 中冶赛迪工程技术股份有限公司 | Technique method of thin middle plate continuous casting and rolling production |
| KR20140085188A (en) * | 2012-12-27 | 2014-07-07 | 주식회사 포스코 | Method for manufacturing hot rolled steel plate and hot rolled steel sheet |
| CN106011421A (en) * | 2016-06-06 | 2016-10-12 | 日照宝华新材料有限公司 | Method for producing thin-specification S500MC steel based on ESP thin slab continuous casting and rolling process |
| CN106756508A (en) * | 2016-12-30 | 2017-05-31 | 日照宝华新材料有限公司 | The method that Thin Specs REH380LA steel is produced based on ESP bar strip continuous casting and rolling flow paths |
| CN106834887A (en) * | 2016-12-30 | 2017-06-13 | 日照宝华新材料有限公司 | The method that Thin Specs RE510L steel is produced based on ESP bar strip continuous casting and rolling flow paths |
Non-Patent Citations (8)
| Title |
|---|
| CITIC-CBMM中信微合金化技术中心: "《汽车用铌微合金化钢板》", 31 October 2006, 北京：冶金工业出版社 * |
| 吕瑞国: "《连续铸钢实训指导书》", 30 April 2016, 北京：冶金工业出版社 * |
| 孙玮: "《中厚板生产900问》", 31 July 2017, 北京：冶金工业出版社 * |
| 李生根: "欧标冷成型用高屈服强度钢板S355MC的研究与开发", 《莱钢科技》 * |
| 杨文峰: "热轧带钢无头轧制动态变规格控制技术", 《轧钢》 * |
| 杨春政: "对薄板坯无头轧制技术的初步认识", 《百度文库》 * |
| 鄢朝勇: "《土木工程材料》", 31 July 2014, 北京：中国建材工业出版社 * |
| 陈连生: "《热轧薄板生产技术》", 31 March 2006, 北京：冶金工业出版社 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112695251A (en) * | 2020-12-21 | 2021-04-23 | 本钢板材股份有限公司 | Production method of thick seaside building structure steel S355G11M hot-rolled coil |
| CN113528940A (en) * | 2021-06-16 | 2021-10-22 | 首钢集团有限公司 | Aluminum-silicon alloy plating layer hot forming steel and preparation method thereof |
| CN113528940B (en) * | 2021-06-16 | 2022-06-21 | 首钢集团有限公司 | Aluminum-silicon alloy plating layer hot forming steel and preparation method thereof |
| CN114012056A (en) * | 2021-10-14 | 2022-02-08 | 首钢集团有限公司 | 1500 MPa-grade hot forming steel and preparation method thereof |
| CN114012056B (en) * | 2021-10-14 | 2023-10-13 | 首钢集团有限公司 | 1500 MPa-level hot forming steel and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107502821A (en) | The economical X 70 pipeline steel plate and its manufacture method used under a kind of special think gauge ultra-low temperature surroundings | |
| CN105838994B (en) | Chrome plating and its manufacture method, crown plug | |
| CN111676419A (en) | Method for preparing S355MC steel coil based on multi-mode sheet billet continuous casting and rolling production line and product thereof | |
| CN105112776A (en) | Phosphorus-containing low-carbon cold-rolled hard tin-plated steel plate and production method thereof | |
| CN109097699B (en) | 900 MPa-grade hot-rolled automobile girder steel and manufacturing method thereof | |
| CN114012056B (en) | 1500 MPa-level hot forming steel and preparation method thereof | |
| CN110578042B (en) | Production method of steel for cold-hardening pipe | |
| CN110106444B (en) | 700 MPa-grade hot-rolled plate coil for driving axle housing and preparation method thereof | |
| CN113528944B (en) | 1000MPa easily-formed wear-resistant steel plate and preparation method thereof | |
| CN110669913B (en) | Hot-rolled and acid-washed dual-phase steel for high-strength automobile wheels and production method thereof | |
| CN109023105A (en) | A kind of vehicle structure hot-strip and manufacturing method | |
| CN107043890A (en) | A kind of 1.5~3.0mm of thickness yield strengths are more than 700MPa Hot Rolling Automobile steel and its manufacture method | |
| CN105112775B (en) | A kind of high formability hot continuous-milling steel plate and its production method | |
| CN112522618A (en) | Full-ferrite high-strength steel and preparation method thereof | |
| CN111672907A (en) | Method for preparing S500MC steel coil based on multi-mode sheet billet continuous casting and rolling production line and product thereof | |
| CN113025913A (en) | 700MPa steel based on multi-mode sheet billet continuous casting and rolling production line and production method thereof | |
| CN113025918A (en) | 800MPa steel based on multi-mode sheet billet continuous casting and rolling production line and production method thereof | |
| CN111996459B (en) | CSP (cast steel plate) process-based special high-strength steel plate for automobile with grade of more than 1000Mpa and manufacturing method thereof | |
| CN110983180B (en) | Hot-rolled high-strength steel and preparation method and application thereof | |
| CN114836696B (en) | 390 MPa-level steel for automobile axle housing for hot stamping and production method thereof | |
| CN114807780B (en) | 600 MPa-level steel for automobile axle housing for hot stamping and production method thereof | |
| CN114480960B (en) | 800 MPa-grade high-strength steel with low yield ratio and low-temperature toughness and production process thereof | |
| CN113667892B (en) | Economical low-temperature continuous annealing cold-rolled high-strength steel strip and production method thereof | |
| CN115572912A (en) | Method for controlling cooling uniformity of steel plate for economic 460 MPa-level engineering structure | |
| CN110284077B (en) | Manufacturing method of thin-gauge high-toughness pipeline steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200918 |