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A kind of 1500mpa grade cold forming strip steel and its production method

A production method and cold forming technology, applied in the field of metallurgy, can solve the problems of rising cost of auto parts and high cost of hot forming steel, and achieve the effects of improving plasticity, toughness, excellent welding and cold forming performance

Active Publication Date: 2021-06-08
TANGSHAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of hot-formed steel is too high, resulting in an increase in the cost of auto parts. On this basis, the demand for cold-formed ultra-high-strength steel by automobile OEMs is becoming more and more urgent

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  • A kind of 1500mpa grade cold forming strip steel and its production method
  • A kind of 1500mpa grade cold forming strip steel and its production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The thickness of the 1500MPa-grade cold-formed steel strip in this embodiment is 1.4mm, and its chemical composition and mass percentage are shown in Table 1.

[0034] The production method of the 1500MPa grade cold-formed steel strip of this embodiment includes molten iron pretreatment, converter steelmaking, LF furnace refining, RH refining, continuous casting, hot rolling, cold rolling, continuous annealing and smoothing process, and the specific process steps are as follows:

[0035](1) Hot metal pretreatment process: use composite injection Mg particles to reduce S in hot metal to 25ppm;

[0036] (2) Steelmaking process: 100 tons of top-bottom combined blowing converter is used, the end point control of the converter is: C: 0.024%, P: 0.009%; The phosphorus content of the finished product, the slag blocking method adopts the front and rear double gears, and adds medium-carbon ferromanganese, aluminum particles, low-carbon ferrochromium and ferromolybdenum during th...

Embodiment 2

[0047] The thickness of the 1500MPa-grade cold-formed steel strip in this embodiment is 0.8mm, and its chemical composition and mass percentage are shown in Table 1.

[0048] The production method of the 1500MPa grade cold-formed steel strip of this embodiment includes molten iron pretreatment, converter steelmaking, LF furnace refining, RH refining, continuous casting, hot rolling, cold rolling, continuous annealing and smoothing process, and the specific process steps are as follows:

[0049] (1) Hot metal pretreatment process: use composite injection Mg particles to reduce S in hot metal to 30ppm;

[0050] (2) Steelmaking process: 100-ton top-bottom re-blowing converter is used. The end point of the converter is controlled as follows: C: 0.022%, P: 0.008%; The phosphorus content of the finished product, the slag blocking method adopts the front and rear double gears, and adds medium-carbon ferromanganese, aluminum particles, low-carbon ferrochromium and ferromolybdenum duri...

Embodiment 3

[0061] The thickness of the 1500MPa-grade cold-formed steel strip in this embodiment is 1.5mm, and its chemical composition and mass percentage are shown in Table 1.

[0062] The production method of the 1500MPa grade cold-formed steel strip of this embodiment includes molten iron pretreatment, converter steelmaking, LF furnace refining, RH refining, continuous casting, hot rolling, cold rolling, continuous annealing and smoothing process, and the specific process steps are as follows:

[0063] (1) Hot metal pretreatment process: use composite injection Mg particles to reduce S in hot metal to 20ppm;

[0064] (2) Steelmaking process: 100 tons of top-bottom combined blowing converter is used, the end point control of the converter is: C: 0.035%, P: 0.009%; The phosphorus content of the finished product, the slag blocking method adopts the front and rear double gears, and adds medium-carbon ferromanganese, aluminum particles, low-carbon ferrochromium and ferromolybdenum during t...

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Abstract

The invention discloses a 1500MPa grade cold-formed steel strip and its production method. The chemical composition and mass percentage of the steel strip are: C: 0.25-0.40%, Mn: 1.10-1.70%, S≤0.012% , P≤0.020%, Si: 0.10~0.30%, Als: 0.030~0.050%, Cr: 0.20~0.40%, B: 0.0010~0.0030%, Ti: 0.035~0.050%, V: 0.15~0.30%, N≤ 0.0030%, the rest is iron and unavoidable impurities; the production method includes molten iron pretreatment, converter steelmaking, LF furnace refining, RH refining, continuous casting, hot rolling, cold rolling, continuous annealing and tempering processes. The structure of the obtained strip steel is evenly distributed Maho islands and a very small amount of ferrite, and has ultra-high strength, excellent welding and cold forming properties.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a 1500MPa grade cold-formed steel strip and a production method thereof. Background technique [0002] With the improvement of automobile safety performance requirements, more and more automobile OEMs use 1500MPa-level hot-formed steel, which can not only achieve the purpose of weight reduction, but also improve the safety of automobiles. However, the cost of hot-formed steel is too high, resulting in an increase in the cost of auto parts. On this basis, the demand for cold-formed ultra-high-strength steel by automobile OEMs is becoming more and more urgent. This requires the development of a steel with high strength and good formability. This type of steel is composed of ferrite and Mao Island, and has a low yield ratio, high work hardening rate, Good strength and extensibility, etc., are currently favored by major automobile manufacturers. In order to design co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/38C22C38/32C22C38/28C22C38/24C22C38/06C22C38/04C22C38/02C22C33/06C21D8/02C21D1/26
CPCC21D1/26C21D8/0205C21D8/0226C21D8/0236C21D8/0247C22C33/06C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/24C22C38/28C22C38/32C22C38/38
Inventor 刘靖宝张洪波杜明山王朝陈卓刘丽萍李孟星杨明维韩世绪
Owner TANGSHAN IRON & STEEL GROUP
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