CN115491589B - 800 MPa-level CSP short-flow hot-rolled high-strength structural steel and manufacturing method thereof - Google Patents
800 MPa-level CSP short-flow hot-rolled high-strength structural steel and manufacturing method thereof Download PDFInfo
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- 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
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- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
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- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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Abstract
The invention discloses 800 MPa-level CSP short-flow hot-rolled high-strength structural steel and a preparation method thereof, wherein the structural steel comprises the following chemical components in percentage by weight: 0.045-0.069%, si: less than or equal to 0.20 percent, mn:1.3 to 1.7 percent, P: less than or equal to 0.012 percent, S: less than or equal to 0.003 percent, ti:0.12 to 0.20 percent, cr:0.15 to 0.50 percent, als: 0.06-0.20%, as is less than or equal to 0.012%, N is less than or equal to 0.005%, and the balance is Fe and unavoidable impurities. The steel sheet strip with the yield strength of more than or equal to 800MPa has low process cost and alloy cost, the tensile strength of more than or equal to 850MPa, the elongation rate of more than or equal to 18 percent, higher elongation plasticity, extremely high strength-plastic product and capability of meeting various forming processes such as rolling and bending of users and various application requirements and application environments such as welding.
Description
Technical Field
The invention relates to the field of micro-alloyed steel manufacturing, in particular to 800 MPa-level CSP short-flow hot-rolled high-strength structural steel and a manufacturing method thereof.
Background
How to realize the light weight of the structure by improving the strength of the steel plate, thereby achieving the effects of reducing consumption and energy, reducing the labor intensity of workers and the like, and becoming the necessity of the development of modern steel materials. For general structural steels, the plastic level tends to decrease as the strength of the material increases. The plasticity characterizes the deformability of the material, and the too low plasticity can directly influence the formation of a user part structure, so that the problems of cracking and the like are easy to occur, and the material is not available. How to solve the contradiction between strength and plasticity is also a difficult point for researching and developing iron and steel materials.
High strength steel with yield strength of 800MPa has been studied and manufactured in both domestic and foreign institutions and enterprises. A weather-resistant hot-rolled steel sheet with excellent high strength and a method for manufacturing the same (patent No. CN 101568659A) published by foreign POSCO corporation, a method for manufacturing a steel sheet with high tensile strength and ductility published by Castane Le Mida L French corporation, and a sheet obtained thereby (patent No. CN 101784688A), a hot-rolled strip steel with yield strength higher than 800MPa and a method for manufacturing the same (patent No. CN 101560629A) developed by domestic university, such as North east, a high-strength steel with yield strength of 800MPa grade developed by Baoshan iron and Steel Co Ltd, and a method for manufacturing the same (patent No. CN 104513937A) can reach 800MPa grade, but the elongation can only be ensured not less than 12%, and the diversity requirement of users cannot be fully satisfied. How to develop a low-alloy high-strength steel material with high strength and high plasticity and economical efficiency and practicability at the same time has quite difficulty.
Disclosure of Invention
The invention aims to solve the defects of the background technology, and provides 800 MPa-level CSP short-flow hot-rolled high-strength structural steel and a manufacturing method thereof, which adopt low-cost alloy and process design to produce, on one hand, ensure high strength (yield strength is not less than 800MPa, tensile strength is not less than 850 MPa), and more importantly, realize high plasticity (elongation after break is not less than 18%).
The technical scheme of the invention is as follows: a800 MPa class CSP short-flow hot-rolled high-strength structural steel is characterized by comprising the following chemical components in percentage by weight,
c: 0.045-0.069%, si: less than or equal to 0.20 percent, mn:1.3 to 1.7 percent, P: less than or equal to 0.012 percent, S: less than or equal to 0.003 percent, ti:0.12 to 0.20 percent, cr:0.15 to 0.50 percent, als: 0.06-0.20%, as is less than or equal to 0.012%, N is less than or equal to 0.005%, and the balance is Fe and unavoidable impurities.
Preferably, the composition comprises the following chemical components in percentage by weight,
c: 0.058-0.060%, si: less than or equal to 0.12 percent, mn:1.63 to 1.68 percent, P: less than or equal to 0.009%, S: less than or equal to 0.003 percent, ti: 0.160-0.165%, cr:0.39 to 0.44 percent, als: 0.082-0.105%, as is less than or equal to 0.0042%, N is less than or equal to 0.005%, and the balance is Fe and unavoidable impurities.
Preferably, the thickness of the 800 MPa-level CSP short-process hot-rolled high-strength structural steel is 1.2-4.5 mm, the yield strength is more than or equal to 800MPa, the tensile strength is more than or equal to 850MPa, and the elongation is more than or equal to 18%.
The invention also provides a preparation method of the 800 MPa-level CSP short-flow hot-rolled high-strength structural steel, which is characterized by comprising the following steps of:
1) After converter smelting, the molten steel enters an LF furnace for refining treatment, and the chemical components and the weight percentages of the molten steel are C: 0.045-0.069%, si: less than or equal to 0.20 percent, mn:1.3 to 1.7 percent, P: less than or equal to 0.012 percent, S: less than or equal to 0.003 percent, ti:0.12 to 0.20 percent, cr:0.15 to 0.50 percent, als: 0.06-0.20%, as is less than or equal to 0.012%, N is less than or equal to 0.005%, and the balance is Fe and unavoidable impurities;
2) And then carrying out sheet bar continuous casting and rolling production on the molten steel: the thickness of the cast steel billet is 60-85 mm; heating the casting blank in a soaking pit, wherein the heating temperature is controlled to be 1210-1250 ℃; rolling in a 7-frame finishing mill, wherein the initial rolling temperature of finish rolling is more than or equal to 1100 ℃, the rolling reduction rate of the first three passes is more than or equal to 50%, the pass temperature is more than or equal to 1050 ℃, the F4 pass reduction rate is more than or equal to 40%, the F5 pass reduction rate is more than or equal to 35%, constant-speed rolling is adopted according to the thickness specification, the rolling speed is controlled to be 3.0-12.0 m/s, the final rolling temperature is controlled to be 870-920 ℃, and the rolling thickness is 1.2-4.5 mm;
3) Laminar cooling: the water cooling speed is 70-120 ℃/s, cooling to 650-700 ℃, and then cooling to 600-640 ℃ according to the water cooling speed less than or equal to 10 ℃/s for coiling.
Preferably, in the step 1), the chemical components and weight percentages of the molten steel are controlled as follows: 0.058-0.060%, si: less than or equal to 0.12 percent, mn:1.63 to 1.68 percent, P: less than or equal to 0.009%, S: less than or equal to 0.003 percent, ti: 0.160-0.165%, cr:0.39 to 0.44 percent, als: 0.082-0.105%, as is less than or equal to 0.0042%, N is less than or equal to 0.005%, and the balance is Fe and unavoidable impurities.
Preferably, in the step 2), the casting blank is heated in a soaking pit, and the heating temperature is controlled between 1230 and 1240 ℃.
Preferably, in the step 2), constant speed rolling is adopted according to the thickness specification, the rolling speed is controlled to be 6.2-8.1 m/s, and the final rolling temperature is controlled to be 890-910 ℃.
Preferably, in the step 3), the temperature is cooled to 660-680 ℃, and then the temperature is cooled to 610-630 ℃ according to the water cooling speed of less than or equal to 10 ℃ per second for coiling.
The chemical components of the invention are described below:
carbon C: carbon is the most economical strengthening element. However, if the carbon content is more than 0.07%, good formability of the material cannot be satisfied, peritectic reaction of molten steel occurs during casting, risks of continuous casting and steel leakage are increased, and weldability of the steel is affected by the excessively high carbon content. Therefore, the carbon content is limited to the range of 0.045 to 0.069%.
Silicon Si: silicon can purify ferrite and avoid generation of coarse carbide during cooling, but silicon also easily forms Fe 2 SiO 4 And eutectoid products are formed on the surface of the steel billet and FeO, and the eutectoid products are solidified into an anchor-shaped structure, so that the FeO is difficult to remove, and the final surface quality is affected. The silicon content is limited to a range of 0.20% or less.
Manganese Mn: manganese is the most effective element for improving strength and toughness, and can effectively delay pearlite transformation. If the content is less than 1.30%, the material strength requirement cannot be met; however, the addition of excessive manganese also tends to cause ladle reaction and cause quality problems such as continuous casting cracks, so that the manganese content is limited to a range of 1.30 to 1.70%.
Chromium Cr: chromium is a carbide forming element, has strong affinity with carbon, can prevent the diffusion of carbon atoms, and has the combined effect of manganese, so that the pearlite and bainite transformation is obviously delayed. In the present invention, the chromium content is controlled to be 0.15-0.50%.
Titanium Ti: the precipitation strengthening effect of titanium is outstanding, and is an economic and effective element for guaranteeing the strength of steel, and the titanium content range of the invention is designed to be 0.12-0.20%.
Phosphorus P: phosphorus is liable to cause center segregation, which affects the formability. In the invention, the phosphorus content is controlled to be less than or equal to 0.012 percent.
Aluminum Als: as an effective deoxidizer in the smelting process, the aluminum alloy has certain grain refining effect, improves the strength of steel, and is easy to form Al 2 O 3 Inclusions. In the invention, the content of acid-soluble aluminum is controlled to be 0.06-0.20%.
Arsenic As: the toughness and plasticity of the material can be greatly reduced, and the arsenic content is strictly controlled to be less than or equal to 0.012 percent in the invention.
Sulfur S, nitrogen N: the alloy is easy to combine with Ti in steel, influences the strengthening effect of the Ti, greatly influences the plasticity of the steel, and controls the sulfur to be less than or equal to 0.003 percent and the nitrogen to be less than or equal to 0.005 percent in the invention.
Except for limiting the ranges of the chemical components, the invention does not add precious alloy elements such as Nb, cu, ni, mo from the viewpoints of improving the formability and economy of the material.
The control of the main process is explained below.
The CSP production line is characterized in that a continuous casting blank is directly fed into a heating furnace for heating after being poured and cut, is rolled by a 7-pass rolling mill after being discharged for dephosphorization, and is coiled after being cooled by laminar flow; compared with the conventional process, the time and energy consumption of the whole production process are greatly reduced, and the method has the characteristic of green environmental protection.
And according to the load condition of the rolling mill in the production line, selecting the blank thickness of 62-85 mm according to different finished product thicknesses to roll.
The casting blank is heated and kept at 1210-1250 ℃, and the temperature can enable alloy elements to be more solid-dissolved into austenite, and the alloy elements are precipitated in the subsequent low-temperature stage to achieve a larger strengthening effect.
The final rolling temperature is controlled between 870 ℃ and 920 ℃, and the deformation can lead the austenite to obtain larger deformation storage energy in the temperature range, thereby providing dynamic conditions and nucleation points for the subsequent ferrite transformation and precipitation.
The intermediate temperature is controlled between 650-700 ℃, and the temperature range is rapidly cooled to increase the supercooling degree of austenite after rolling, so that ferrite transformation is facilitated, and a foundation is provided for subsequent interphase precipitation and dispersion precipitation.
The coiling temperature is controlled at 600-640 ℃, and the temperature range can maximally separate out the nano-grade precipitated phase so as to achieve the precipitation strengthening effect.
According to the thickness of the finished product, the rolling speed is controlled to be 3.0-12.0 m/s for constant-speed rolling, so as to ensure the stability of the coil passing process and the stability of the overall performance.
The beneficial effects of the invention are as follows:
compared with the prior art, the produced steel sheet strip with the yield strength of more than or equal to 800MPa has low process cost and alloy cost, the tensile strength of more than or equal to 850MPa, the elongation rate of more than or equal to 18 percent, and higher elongation plasticity, and the product has extremely high strength-plastic product (up to 18.9GPa percent), can be applied to the field of high-strength structural members with higher forming requirements, and can meet various forming processes such as rolling and bending of users and various application requirements and application environments such as welding.
Drawings
FIG. 1 is a metallographic structure diagram of 800 MPa-level CSP short-flow hot-rolled high-strength structural steel.
Detailed Description
The invention is illustrated in further detail by the following specific examples. Table 1 is a listing of chemical components of various embodiments of the present invention; table 2 is a list of main process parameters for each embodiment of the present invention; the embodiments of the invention are produced according to the following steps:
1) After converter smelting, the molten steel enters an LF furnace for refining treatment, and the chemical components and the weight percentages of the molten steel are C: 0.045-0.069%, si: less than or equal to 0.20 percent, mn:1.3 to 1.7 percent, P: less than or equal to 0.012 percent, S: less than or equal to 0.003 percent, ti:0.12 to 0.20 percent, cr:0.15 to 0.50 percent, als: 0.06-0.20%, as is less than or equal to 0.012%, N is less than or equal to 0.005%, and the balance is Fe and unavoidable impurities;
2) And then carrying out sheet bar continuous casting and rolling production on the molten steel: the thickness of the cast steel billet is 60-85 mm; heating the casting blank in a soaking pit, wherein the heating temperature is controlled to be 1210-1250 ℃; rolling in a 7-frame finishing mill, wherein the initial rolling temperature of finish rolling is more than or equal to 1100 ℃, the rolling reduction rate of the first three passes is more than or equal to 50%, the pass temperature is more than or equal to 1050 ℃, the F4 pass reduction rate is more than or equal to 40%, the F5 pass reduction rate is more than or equal to 35%, constant-speed rolling is adopted according to the thickness specification, the rolling speed is controlled to be 3.0-12.0 m/s, the final rolling temperature is controlled to be 870-920 ℃, and the rolling thickness is 1.2-4.5 mm;
3) Laminar cooling: the water cooling speed is 70-120 ℃/s, the intermediate cooling temperature is 650-700 ℃, and then the intermediate cooling temperature is 600-640 ℃ according to the water cooling speed of less than or equal to 10 ℃/s for coiling.
The chemical composition list of examples 1-5 is shown in Table 1 below, the main process parameters of examples 1-5 are shown in Table 2 below, and the mechanical properties of the products obtained in examples 1-5 are shown in Table 3.
TABLE 1 list of chemical compositions of various embodiments of the invention
TABLE 2 list of major process parameters for various embodiments of the invention
TABLE 3 mechanical property test results list of various embodiments of the invention
As can be seen from Table 3, the finished products obtained in examples 1-5 satisfy the conditions that the yield strength is not less than 800MPa, the tensile strength is not less than 850MPa, the elongation is not less than 18%, and the product of strength and elongation can reach 18.90 GPa. The metallographic structure of the product is shown in figure 1, the structure type is ferrite or ferrite plus a small amount of bainite, and the structure type has good plasticity, so that the product can meet the requirement of the subsequent processing process.
Claims (5)
1. A800 MPa class CSP short-flow hot-rolled high-strength structural steel is characterized by comprising the following chemical components in percentage by weight,
c: 0.058-0.060%, si: less than or equal to 0.12 percent, mn:1.63 to 1.68 percent, P: less than or equal to 0.009%, S: less than or equal to 0.003 percent, ti: 0.160-0.165%, cr:0.39 to 0.44 percent, als: 0.082-0.105%, as is less than or equal to 0.0042%, N is less than or equal to 0.005%, and the balance is Fe and unavoidable impurities;
the thickness of the 800 MPa-level CSP short-process hot-rolled high-strength structural steel is 1.2-4.5 mm, the yield strength is more than or equal to 800MPa, the tensile strength is more than or equal to 850MPa, and the elongation is more than or equal to 18%.
2. The preparation method of 800 MPa-level CSP short-process hot-rolled high-strength structural steel is characterized by comprising the following steps of:
1) After converter smelting, the molten steel enters an LF furnace for refining treatment, and the chemical components and the weight percentages of the molten steel are C: 0.058-0.060%, si: less than or equal to 0.12 percent, mn:1.63 to 1.68 percent, P: less than or equal to 0.009%, S: less than or equal to 0.003 percent, ti: 0.160-0.165%, cr:0.39 to 0.44 percent, als: 0.082-0.105%, as is less than or equal to 0.0042%, N is less than or equal to 0.005%, and the balance is Fe and unavoidable impurities;
2) And then carrying out sheet bar continuous casting and rolling production on the molten steel: the thickness of the cast steel billet is 60-85 mm; heating the casting blank in a soaking pit, wherein the heating temperature is controlled to be 1210-1250 ℃; rolling in a 7-frame finishing mill, wherein the initial rolling temperature of finish rolling is more than or equal to 1100 ℃, the rolling reduction rate of the first three passes is more than or equal to 50%, the pass temperature is more than or equal to 1050 ℃, the F4 pass reduction rate is more than or equal to 40%, the F5 pass reduction rate is more than or equal to 35%, constant-speed rolling is adopted according to the thickness specification, the rolling speed is controlled to be 3.0-12.0 m/s, the final rolling temperature is controlled to be 870-920 ℃, and the rolling thickness is 1.2-4.5 mm;
3) Laminar cooling: the water cooling speed is 70-120 ℃/s, cooling to 650-700 ℃, and then cooling to 600-640 ℃ according to the water cooling speed less than or equal to 10 ℃/s for coiling.
3. The method for preparing 800 MPa-level CSP short-process hot-rolled high-strength structural steel according to claim 2, wherein in step 2), the cast blank is heated in a soaking pit at 1230-1240 ℃.
4. The method for preparing 800 MPa-level CSP short-process hot-rolled high-strength structural steel according to claim 2, wherein in step 2), constant-speed rolling is adopted according to thickness specifications, rolling speed is controlled to be 6.2-8.1 m/s, and finishing temperature is controlled to be 890-910 ℃.
5. The method for preparing 800 MPa-level CSP short-process hot-rolled high-strength structural steel according to claim 2, wherein in the step 3), cooling to 660-680 ℃, and then cooling to 610-630 ℃ at a water-cooling speed of 10 ℃/s or less, and coiling.
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