CN116463559B - High-rigidity cold-rolled stainless steel sheet for building templates and preparation method thereof - Google Patents

High-rigidity cold-rolled stainless steel sheet for building templates and preparation method thereof Download PDF

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CN116463559B
CN116463559B CN202310275312.2A CN202310275312A CN116463559B CN 116463559 B CN116463559 B CN 116463559B CN 202310275312 A CN202310275312 A CN 202310275312A CN 116463559 B CN116463559 B CN 116463559B
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stainless steel
cold
rolled
rolling
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CN116463559A (en
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赵庆升
王振东
王平
赵永璞
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Jiangsu Mingzhu New Material Technology Co ltd
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Jiangsu Mingzhu New Material Technology Co ltd
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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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/005—Manufacture of stainless steel
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • 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
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • 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
    • 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
    • C21D8/0236—Cold rolling
    • 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
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Abstract

The invention discloses a high-rigidity cold-rolled stainless steel sheet for a building template and a preparation method thereof, belonging to the technical field of stainless steel production. The stainless steel sheet comprises the following main components in percentage by mass: 0.07-0.15% of C, 0.2+12×C% of Ni and 12-22% of Cr. The raw material is laterite nickel ore surface ore and derivatives thereof, and the laterite nickel ore surface ore is obtained by smelting, hot rolling and cold rolling in a controlled rolling and controlled cooling mode. When the building template backboard is used as the building template backboard, the yield strength is 850-1000 MP, the breaking strength is more than 1100MPa, which is more than 1.5 times of the breaking strength of the traditional template backboard steel, and the shape stability, the safety and the bow back bending prevention function are greatly enhanced. The stainless steel sheet disclosed by the invention is comprehensively and obviously improved in the aspects of rigidity, yield strength, breaking strength, corrosion resistance, production efficiency, quality and the like, so that the surface quality of the concrete of the support body is better, the surface of the concrete is not required to be cleaned or is less cleaned and is not easy to damage, and the recycling frequency is greatly improved.

Description

High-rigidity cold-rolled stainless steel sheet for building templates and preparation method thereof
Technical Field
The invention belongs to the technical field of stainless steel sheet preparation, and relates to a high-rigidity cold-rolled stainless steel sheet for a building template and a preparation method thereof.
Background
The building template material is different from the general structural material; the function of the device is to keep the flatness, smoothness and compression resistance of the formwork support building body so as to ensure that the supported body has accurate size, few defects and attractive appearance after the formwork is removed. Meanwhile, in order to reduce technical defects of damage of the template in the disassembly process, such as pit breaking, deformation breaking, bending torsion, surface finish damage and the like, the high rigidity, namely the deformation resistance of the material for the building template is an important technical key point.
In the prior art, the materials for the building templates are developed from the original wood templates and carbon steel templates to aluminum templates, and the rigidity is mainly improved as a key performance index. The template material can meet the functional requirements and is lighter in weight due to the high strength and low density on the basis, so that the construction of engineering personnel is facilitated.
The material characteristic factors influencing the rigidity and the weight of the template backboard material are as follows:
the wood template stage is that the material is longitudinal grain wood, the strength is 100-150MPa, and the elastic modulus is 0.098-0.12X10 5 MPa, expansion coefficient of 3.0X10 -6 At a temperature of between 0.5 and 1g/cm 3 ；
The carbon steel template stage is made of carbon steel, the yield strength is 250-500MPa, and the elastic modulus is 2-2.1X10% 5 MPa, expansion coefficient of 11.3-13 x 10 -6 At a temperature of 7.85g/cm 3 ；
The tensile strength of the aluminum alloy 2A13 is 315-345MPa, and the elastic modulus is 0.7X10 5 MPa, expansion coefficient of 23.6x10 -6 At a temperature of 2.7g/cm 3 . When the composite material is used as a template backboard material, the composite advantage is obvious. Therefore, aluminum alloy forms are the dominant product of the lower form back sheet material.
Compared with a carbon steel template, the aluminum template has the main advantage of rust prevention and light weight. But has the technical defects of low elastic modulus, large expansion coefficient, low strength, high manufacturing cost, high cost and the like; in addition, the template backboard is easy to corrode to generate bubbles so as to cause the defect of the concrete surface; has larger wettability with concrete, can not be removed cleanly, and needs to be oiled or difficult to clean.
Chinese patent CN104911319a discloses a steel plate for a low-temperature spherical tank container and a production method thereof, wherein the selection and preparation method of the component content do not consider properties such as corrosion resistance; although the obtained metallographic structure is ferrite and tempered sorbite, the matching relationship between the heat treatment mode and the rolling process is different from that of stainless steel containing the same structure components; the elongation is higher, the corresponding yield strength and breaking strength are lower, and the grain size of the prepared steel plate is larger.
Chinese patent CN112575254a discloses a method for producing high strength steel 09 mnnimovar for pressure vessel with 150mm thickness, the metallographic structure of the prepared material is a mixed structure of free ferrite, tempered sorbite, lath bainite and residual austenite, the heat treatment adopts a complex heat treatment process of high temperature quenching, two-phase zone quenching and tempering, the yield strength, tensile strength and breaking strength are lower, the elongation is higher, and the corrosion resistance is poor.
In a word, in the prior art, from the practical engineering point of view, the material for the building template, which has the advantages of high rigidity, high yield strength, low cost and high turnover, ensures that the surface quality of the concrete of the support body is better, and the surface of the support body does not need to be cleaned or is cleaned less, so that the material is not easy to damage, is an urgent market demand.
Disclosure of Invention
The invention aims to solve the technical problems that the existing template material has low strength, low rigidity and easy deformation, and the surface defect of the concrete of a building or the hidden trouble of convex belly is easy to cause. The invention provides the building template material which has high rigidity, high yield strength, low cost, high turnover and portability, so that the surface quality of the concrete of the support body is better, the self surface of the support body is not required to be cleaned or is less cleaned, and the support body is not easy to damage.
The high-rigidity ferrite and tempered sorbite stainless steel sheet for the building template comprises the following components in percentage by mass: 0.07-0.15% of C, 0.4-1.0% of Si, 0.4-1.5% of Mn, 0.2+12×C of Ni=0.2, 12-22% of Cr, less than or equal to 0.06% of P, less than or equal to 0.015% of S, 0.015-0.040% of N and 0.01-0.04% of Al; the balance of Fe and other unavoidable impurities.
Preferably, the stainless steel sheet has a small amount of other metals such as titanium, niobium, vanadium, etc. added to the composition.
Preferably, the yield strength and the breaking strength of the stainless steel sheet are close, and the yield ratio is more than or equal to 0.88; the elongation is less than or equal to 5 percent, the elastic modulus is 198 to 215MPa, and the expansion coefficient is 11 to 15 multiplied by 10 -6 At a temperature of between 7.7 and 7.8g/cm 3 。
Preferably, the relationship between the C content and the mechanical property in the components of the stainless steel sheet is as follows:
when 850MPa < yield strength <950MPa, the C content is 0.07-0.08%; when 900MPa < yield strength <1050MPa, the carbon content is 0.08-0.09%; when the yield strength is more than 1000MPa and the breaking strength is more than 1100MPa, the content of C is 0.09-0.15%;
the relation between Cr content in the components of the stainless steel sheet and the use environment is as follows:
when in inland environment, the Cr content is 12-15%; when in coastal environment, the Cr content is 15-18%; when in marine environment, the Cr content is 18-22%.
Preferably, when the stainless steel sheet is used as a back plate of a building template, the yield strength of the stainless steel sheet is 1.5 times of the breaking strength of the traditional template back plate steel; compared with a drop hammer pit test of the same-function aluminum template backboard, the drop pit diameter is greatly reduced to below 70% compared with pit depth.
The preparation method is characterized in that laterite-nickel ore surface ores or derivatives thereof are adopted as raw materials, and the specific process steps are as follows:
s1, molten iron obtained through a blast furnace or an electric arc furnace or RK-Larc or other methods is subjected to batching, so that the nickel content in the molten iron after batching can meet the component requirements of a final stainless steel cold-rolled sheet at one time;
s2, continuously casting molten steel obtained by refining the molten iron prepared in the step S1 through AOD and LF into a steel billet; the chromium content is added according to the lower limit control in the AOD stage, or chromite is added into the blast furnace in the step S1, so that the chromium can meet the component requirement of the final stainless steel cold-rolled sheet at one time;
s3, hot rolling the steel billet in the step S2 into a hot rolled coil with the thickness of 2-4 mm;
s4, continuously annealing and pickling the hot rolled coil with the thickness of 2-4mm in the step S3 to obtain a white skin cold rolling raw material, wherein the yield strength is 600-800MPa, and the elongation is more than 10%;
s5, feeding the white skin cold-rolling raw material in the step S4 into a cold rolling mill for cold rolling to obtain a final stainless steel cold-rolled sheet with the thickness of 0.5-1mm, wherein annealing treatment is not carried out during the cold rolling; the metallographic structure in the final stainless steel cold-rolled sheet with the thickness of 0.5-1mm obtained after cold rolling is a nano carbide reinforced ferrite and tempered sorbite double-phase structure, the proportion of tempered sorbite is less than or equal to 30%, and the mechanical property meets the requirement.
Preferably, in the step S1, laterite-nickel ore surface ore is selected as a raw material, and molten iron is obtained through the following 4 modes:
the first mode is sintering and blast furnace; the second mode is RK-Larc three-stage reduction method for producing the obtained low-nickel molten iron; the third mode is to melt low-nickel pig iron smelted by laterite-nickel ore surface ores in an electric arc furnace; and the fourth mode is to prepare molten iron according to the component requirements by melting the related metal raw materials in an electric furnace.
Preferably, in the LF refining stage in the step S2, white slag refining is kept, and the alkalinity is 2.5-4; before LF refining is finished, adjusting components to meet the component requirements of the stainless steel cold-rolled sheet, and controlling the content of acid-soluble aluminum to be 0.008-0.030% so as to be used as a crystallization nucleating agent; the toughness requirements are higher, such as ensuring that the yield strength of the stainless steel cold-rolled sheet is >1050MPa, and the oxygen content in the steel is lower than 30 ppm.
Preferably, the final rolling temperature of the hot rolling in the step S3 is higher than 900 ℃; when the yield strength of the final stainless steel cold-rolled sheet is required to be more than 850MPa, hot rolling and spray cooling are carried out to 860 ℃ for curling; when the yield strength of the final stainless steel cold-rolled sheet is required to be more than 1000MPa, hot rolling and spray cooling are carried out to 760 ℃ for curling; the temperature is controlled to ensure that carbides do not precipitate at the grain boundaries.
Preferably, the temperature of the continuous annealing in the step S4 is 900-1000 ℃ and the time is 15min; when high elongation is required, adopting a temperature close to the upper limit; when lower elongation is required, a near lower temperature is used.
Compared with the prior art, the invention has the following beneficial effects:
compared with the existing template material, the high-rigidity ferrite and tempered sorbite stainless steel cold-rolled sheet provided by the invention is a novel template material, and has the advantages of high rigidity, high yield strength, corrosion resistance, low cost, high turnover and portability, so that the surface quality of the support concrete is better, the self surface is not required to be cleaned or cleaned less, and the support concrete is not easy to damage.
When the building template backboard is used, the yield strength is 1.5 times of the breaking strength of the traditional template backboard steel, the shape stability and the safety are greatly enhanced, and the breaking and bow back bending preventing functions are greatly enhanced. The raw material is laterite nickel ore surface ore and derivatives thereof, and the material is obtained by smelting, hot rolling and cold rolling in a controlled rolling and controlled cooling mode, and is a building template backboard material with high quality, light weight, long service life, low cost and easy recovery. The cycle times of the template can be greatly improved, and the quality of the building body is improved.
Compared with a drop hammer pit test of the same-function aluminum template backboard, the drop pit diameter is greatly reduced to below 70% compared with pit depth.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a process flow diagram of a method for preparing a high rigidity ferrite + tempered sorbite stainless steel sheet according to embodiment 1 of the present invention;
FIG. 2 is a diagram showing the gold phase of a stainless steel sheet obtained by cold rolling in the method for producing a high-rigidity ferrite + tempered sorbite stainless steel sheet according to the embodiment 1 of the present invention, a scale of 50 μm;
FIG. 3 is an electron microscopic view of chromium nano-carbides in the stainless steel obtained after cold rolling by the method for preparing a high-rigidity ferrite + tempered sorbite stainless steel sheet according to the embodiment 1 of the present invention;
FIG. 4 is an electron probe analysis chart of chromium nano-carbide in the stainless steel obtained after cold rolling by the preparation method of the high-rigidity ferrite + tempered sorbite stainless steel sheet of the embodiment 1;
FIG. 5 is a process flow diagram of the method for preparing a high rigidity ferrite + tempered sorbite stainless steel sheet according to the embodiment 2 of the invention;
FIG. 6 is a golden phase diagram of stainless steel obtained after cold rolling by the method for preparing a high rigidity ferrite + tempered sorbite stainless steel sheet according to the embodiment 2 of the present invention, and a scale of 20 μm.
Detailed Description
The technical solutions and the technical problems to be solved in the embodiments of the present invention will be described below in conjunction with the embodiments of the present invention. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present patent.
Examples
The example is a high-rigidity ferrite and tempered sorbite stainless steel sheet for a back plate of a building template in coastal areas, wherein the stainless steel sheet comprises the following components in percentage by mass according to the service environment requirement: 0.12% of C, 0.5% of Si, 0.6% of Mn, 1.64% of Ni, 15.1% of Cr, 0.02% of P, 0.01% of S, 0.035% of N and 0.02% of Al; the balance of Fe and other unavoidable impurities.
Performance requirements: the yield strength is more than 1000MPa, the breaking strength is more than 1100MP, the elongation is 2-3%, and the yield ratio is more than 0.9.
Selecting the technological processes of laterite-nickel ore surface ore, sintering, blast furnace, AOD, LF, continuous casting, hot rolling, annealing, pickling and cold rolling. The process flow of the stainless steel sheet preparation method is as shown in figure 1:
the laterite nickel ore surface ore purchased in coastal ports comprises the following components: 53% of total iron, 2% of chromium and 0.94% of nickel, and the rest metals are not available and are not counted when the materials are mixed.
55.94% of the total effective metal. 1.8 tons of ore are calculated according to the metal yield to obtain 1 ton of nickel-containing chromium-containing molten iron, and the main components of the molten iron are as follows: 95% of total iron, 3.3% of chromium and 1.69% of nickel.
And then, after AOD chromium adding and LF refining, continuously casting into a blank, wherein the components of the steel meet the qualification requirements.
Hot rolling to 980 ℃, spraying and cooling to 760 ℃ after hot rolling, and curling to obtain a 2mm hot rolled coil.
Annealing temperature is 920 ℃, continuous annealing and acid washing are carried out for 15 minutes, and the white skin coil is obtained.
Cold rolling to 0.5mm. The mechanical property meets the requirement. The metallographic structure of the stainless steel obtained after cold rolling is a nano carbide reinforced ferrite and tempered sorbite dual-phase structure, and is shown in figure 2.
Electron microscopy and electron probe analysis of chromium nanocarbides are shown in fig. 3-4.
Examples
The example is a high-rigidity ferrite and tempered sorbite stainless steel sheet for an inland building template backboard, and the high-rigidity ferrite and tempered sorbite stainless steel sheet comprises the following components in percentage by mass according to the service environment requirements: 0.08% of C, 0.5% of Si, 0.7% of Mn, 1.16% of Ni, 12% of Cr, 0.03% of P, 0.015% of S, 0.03% of N and 0.025% of Al; the balance of Fe and other unavoidable impurities.
The performance requirements of the stainless steel sheet are as follows: the yield strength is greater than 950MPa, the breaking strength is greater than 1050MPa, the elongation is 4-5%, and the yield ratio is greater than 0.88.
The preparation method of the stainless steel sheet is shown in fig. 5.
Selecting low nickel iron blocks produced by laterite nickel ore surface ores. The low ferronickel block comprises the following components: 95% of total iron, 3.7% of chromium, 1.2% of nickel and the balance of metals.
After the arc furnace is melted, the steel is subjected to AOD chromium adding and LF refining, continuous casting into a blank, and the components of the steel reach the qualification requirements.
Hot rolling to 980 ℃, spraying and cooling to 860 ℃ after hot rolling, and curling to obtain the 4mm hot rolled coil.
The annealing temperature is 980 ℃, and the continuous annealing and acid washing are carried out for 15 minutes, so that the white skin coil is obtained.
Cold rolling to 1mm. The metallographic structure of the stainless steel obtained after cold rolling is a nano carbide reinforced ferrite and tempered sorbite dual-phase structure, as shown in figure 6. The mechanical property meets the requirement.
Compared with the existing template material, the high-rigidity ferrite and tempered sorbite stainless steel cold-rolled sheet provided by the invention is a novel template material, and has the advantages of high rigidity, high yield strength, corrosion resistance, low cost, high turnover and portability, so that the surface quality of the support concrete is better, the self surface is not required to be cleaned or cleaned less, and the support concrete is not easy to damage.
When the building template backboard is used, the yield strength is 1.5 times of the breaking strength of the traditional template backboard steel, the shape stability and the safety are greatly enhanced, and the breaking and bow back bending preventing functions are greatly enhanced. The raw material is laterite nickel ore surface ore and derivatives thereof, and the material is obtained by smelting, hot rolling and cold rolling in a controlled rolling and controlled cooling mode, and is a building template backboard material with high quality, light weight, long service life, low cost and easy recovery. The cycle times of the template can be greatly improved, and the quality of the building body is improved.
Compared with a drop hammer pit test of the same-function aluminum template backboard, the drop pit diameter is greatly reduced to below 70% compared with pit depth.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.

Claims (6)

1. The high-rigidity cold-rolled stainless steel sheet for the building template is characterized by comprising the following components in percentage by mass: 0.07-0.15% of C, 0.4-1.0% of Si, 0.4-1.5% of Mn, 0.2+12×C of Ni=0.2, 12-22% of Cr, less than or equal to 0.06% of P, less than or equal to 0.015% of S, 0.015-0.040% of N and 0.01-0.04% of Al; the balance of Fe and other unavoidable impurities;
the yield ratio of the stainless steel sheet is more than or equal to 0.88; the elongation is less than or equal to 5 percent, the elastic modulus is 198 to 215MPa, and the expansion coefficient is 11 to 15 multiplied by 10 -6 At a temperature of between 7.7 and 7.8g/cm 3 ；
The relation between the C content and the mechanical property in the components of the stainless steel sheet is as follows:
when 850MPa < yield strength <950MPa, the C content is 0.07-0.08%; when 900MPa < yield strength <1050MPa, the carbon content is 0.08-0.09%; when the yield strength is more than 1000MPa and the breaking strength is more than 1100MPa, the content of C is 0.09-0.15%;
the relation between Cr content in the components of the stainless steel sheet and the use environment is as follows:
when in inland environment, the Cr content is 12-15%; when in coastal environment, the Cr content is 15-18%; when in marine environment, the Cr content is 18-22%;
the preparation method of the high-rigidity cold-rolled stainless steel sheet for the building template adopts laterite nickel ore surface ore as raw materials, and comprises the following specific process steps:
s1, the molten iron obtained through a blast furnace or an electric arc furnace is subjected to batching, so that the nickel content in the molten iron after batching can meet the component requirements of a final stainless steel cold-rolled sheet;
s2, continuously casting molten steel obtained by refining the molten iron prepared in the step S1 through AOD and LF into a steel billet; the chromium content is added according to the lower limit control in the AOD stage, so that the chromium can meet the component requirement of the final stainless steel cold-rolled sheet at one time;
s3, hot rolling the steel billet in the step S2 into a hot rolled coil with the thickness of 2-4 mm;
s4, continuously annealing and pickling the hot rolled coil with the thickness of 2-4mm in the step S3 to obtain a white skin cold rolling raw material, wherein the yield strength is 600-800MPa, and the elongation is more than 10%;
s5, feeding the white skin cold-rolling raw material in the step S4 into a cold rolling mill for cold rolling to obtain a final stainless steel cold-rolled sheet with the thickness of 0.5-1mm, wherein annealing treatment is not carried out during the cold rolling; the metallographic structure in the final stainless steel cold-rolled sheet with the thickness of 0.5-1mm obtained after cold rolling is a nano carbide reinforced ferrite and tempered sorbite double-phase structure, the proportion of tempered sorbite is less than or equal to 30%, and the mechanical property meets the requirement.
2. The cold rolled stainless steel sheet according to claim 1, wherein the stainless steel sheet has a yield strength 1.5 times the breaking strength of conventional template backing steel when used as a building template backing plate; compared with a drop hammer pit test of the same-function aluminum template backboard, the drop pit diameter and pit depth ratio of the backboard material are reduced to below 70%.
3. A method for preparing a cold-rolled stainless steel sheet based on any one of claims 1-2, characterized in that laterite nickel ore surface ores are adopted as raw materials in the preparation method, and the specific process steps are as follows:
s1, the molten iron obtained through a blast furnace or an electric arc furnace is subjected to batching, so that the nickel content in the molten iron after batching can meet the component requirements of a final stainless steel cold-rolled sheet;
s2, continuously casting molten steel obtained by refining the molten iron prepared in the step S1 through AOD and LF into a steel billet; the chromium content is added according to the lower limit control in the AOD stage, so that the chromium can meet the component requirement of the final stainless steel cold-rolled sheet at one time;
s3, hot rolling the steel billet in the step S2 into a hot rolled coil with the thickness of 2-4 mm;
s4, continuously annealing and pickling the hot rolled coil with the thickness of 2-4mm in the step S3 to obtain a white skin cold rolling raw material, wherein the yield strength is 600-800MPa, and the elongation is more than 10%;
s5, feeding the white skin cold-rolling raw material in the step S4 into a cold rolling mill for cold rolling to obtain a final stainless steel cold-rolled sheet with the thickness of 0.5-1mm, wherein annealing treatment is not carried out during the cold rolling; the metallographic structure in the final stainless steel cold-rolled sheet with the thickness of 0.5-1mm obtained after cold rolling is a nano carbide reinforced ferrite and tempered sorbite double-phase structure, the proportion of tempered sorbite is less than or equal to 30%, and the mechanical property meets the requirement.
4. A method of producing cold rolled stainless steel sheet according to claim 3, wherein in step S2, the LF refining stage is maintained with white slag refining, the basicity is 2.5-4; before LF refining is finished, adjusting components to meet the component requirements of the stainless steel cold-rolled sheet, and controlling the content of acid-soluble aluminum to be 0.008-0.030% so as to be used as a crystallization nucleating agent; the requirement on toughness is higher, and when the yield strength of the stainless steel cold-rolled sheet is more than 1050MPa, the oxygen content in the steel is lower than 30 ppm.
5. The method for manufacturing a cold rolled stainless steel sheet according to claim 3, wherein the finish rolling temperature of the hot rolling in the step S3 is higher than 900 ℃; when the yield strength of the final stainless steel cold-rolled sheet is required to be more than 850MPa, hot rolling and spray cooling are carried out to 860 ℃ for curling; when the yield strength of the final stainless steel cold-rolled sheet is required to be more than 1000MPa, hot rolling and spray cooling are carried out to 760 ℃ for curling; the temperature is controlled to ensure that carbides do not precipitate at the grain boundaries.
6. A method of producing cold rolled stainless steel sheet according to claim 3, wherein the continuous annealing in step S4 is performed at a temperature of 900-1000 ℃ for 15min.
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CN101962736A (en) * 2009-07-23 2011-02-02 宝山钢铁股份有限公司 Ferrite stainless steel and manufacturing method thereof
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