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1200MPa-grade ultra-fast cold-rolled double-phase steel plate and preparation method thereof

An ultra-fast cooling and ultra-fast technology, applied in the field of metallurgy, can solve the problems of high weight percentage, unfavorable welding and surface quality control, etc., achieve the effect of uniform structure and performance, reduce hardenability and strength, and improve hardenability of steel plates

Active Publication Date: 2019-01-29
HANDAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this steel is that the weight percentages of C and Si are high, which is not conducive to welding and surface quality control

Method used

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  • 1200MPa-grade ultra-fast cold-rolled double-phase steel plate and preparation method thereof
  • 1200MPa-grade ultra-fast cold-rolled double-phase steel plate and preparation method thereof
  • 1200MPa-grade ultra-fast cold-rolled double-phase steel plate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Table 1 shows the chemical composition and mass percentage of the 1200 MPa class ultra-fast cold-rolled dual-phase steel sheet in this example.

[0039] The preparation method of 1200MPa ultra-fast cold-rolled dual-phase steel plate includes smelting, continuous casting, hot rolling, cold rolling, annealing, and skin-passing processes, and the specific process steps are as follows:

[0040] (1) Smelting process: Converter smelting, LF+RH double process;

[0041] (2) Continuous casting process: After smelting, the molten steel is continuously cast to obtain continuous casting slabs, and the chemical composition and mass percentage of the continuous casting slabs are shown in Table 1;

[0042] (3) Hot rolling process: heat the slab to 1220°C, control the final rolling temperature at 850°C, and cool it to 630°C for coiling through the laminar cooling system after rolling, with a cooling rate of 15°C / s;

[0043] (4) Cold rolling process: cold rolling reduction rate is cont...

Embodiment 2

[0048] Table 1 shows the chemical composition and mass percentage of the 1200 MPa class ultra-fast cold-rolled dual-phase steel sheet in this example.

[0049] The preparation method of 1200MPa ultra-fast cold-rolled dual-phase steel plate includes smelting, continuous casting, hot rolling, cold rolling, annealing, and skin-passing processes, and the specific process steps are as follows:

[0050] (1) Smelting process: Converter smelting, LF+RH double process;

[0051] (2) Continuous casting process: After smelting, the molten steel is continuously cast to obtain continuous casting slabs, and the chemical composition and mass percentage of the continuous casting slabs are shown in Table 1;

[0052] (3) Hot rolling process: heat the slab to 1260°C, control the final rolling temperature at 880°C, and cool it to 580°C for coiling through the laminar cooling system after rolling, with a cooling rate of 20°C / s;

[0053] (4) Cold rolling process: cold rolling reduction rate is cont...

Embodiment 3

[0058] Table 1 shows the chemical composition and mass percentage of the 1200 MPa class ultra-fast cold-rolled dual-phase steel sheet in this example.

[0059] The preparation method of 1200MPa ultra-fast cold-rolled dual-phase steel plate includes smelting, continuous casting, hot rolling, cold rolling, annealing, and skin-passing processes, and the specific process steps are as follows:

[0060] (1) Smelting process: Converter smelting, LF+RH double process;

[0061] (2) Continuous casting process: After smelting, the molten steel is continuously cast to obtain continuous casting slabs, and the chemical composition and mass percentage of the continuous casting slabs are shown in Table 1;

[0062] (3) Hot rolling process: the slab is heated to 1247°C, the final rolling temperature is controlled at 862°C, and after rolling, it is cooled to 600°C by a laminar cooling system for coiling, and the cooling rate is 17°C / s;

[0063] (4) Cold rolling process: cold rolling reduction r...

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Abstract

The invention discloses a 1200MPa-grade ultra-fast cold-rolled double-phase steel plate and a preparation method thereof. The steel plate comprises the chemical components of, by mass, 0.12-0.17% of C, 0.3-0.6% of Si, 2.0-2.4% of Mn, less than or equal to 0.015% of P, less than or equal to 0.008% of S, 0.03-0.06% of Als, 0.03-0.06% of Ti, less than or equal to 0.005% of N, and the balance being Feand unavoidable impurities. The preparation method includes smelting, continuous casting, hot rolling, cold rolling, annealing, and leveling processes. By adoption of the design of Ti-microalloying and low-alloying composition, the continuous retreating process is utilized; the water-cooling is ultra-fast; the hardenability of the steel plate is improved; a cold-rolled dual-phase steel with ferrite and martensite biphasic structure morphology is obtained; the structure is uniform; the strength of extension reaches 1200 MPa or more; and the mechanical properties are excellent.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a 1200MPa class ultra-fast cold-rolled dual-phase steel plate and a preparation method thereof. Background technique [0002] 1200MPa grade cold-rolled dual-phase steel has developed into a high-strength structural steel with good formability due to its low yield ratio, high initial work hardening rate, and good combination of strength and ductility. Its microstructure is mainly composed of Composed of soft ferrite matrix and a small amount of hard martensite phase, this steel grade can be obtained by low alloy steel through critical zone heat treatment and controlled rolling process. This dual-phase composite structure makes it have good strength Plastic matching and cold deformation properties are widely used in structural parts, reinforcements and anti-collision parts. [0003] Since 1200MPa grade cold-rolled dual-phase steel needs to add more alloying elements...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C38/14C21D8/02
CPCC21D8/0226C21D8/0236C21D8/0242C21D8/0247C21D2211/005C21D2211/008C22C38/02C22C38/04C22C38/06C22C38/14
Inventor 许斌李守华刘自权何方程迪贾亚飞刘鹏
Owner HANDAN IRON & STEEL GROUP
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