Production method of cold-rolled annealed low-carbon steel strip with low cost and high stamping forming performance

A technology of stamping formability and production method, which is applied in the production field of low-cost and high stamping formability cold-rolled and annealed low-carbon steel strip, can solve the problems of high product price, increased production difficulty, and high steelmaking requirements. , to achieve the effect of improving the nucleation rate of ferrite, increasing the energy storage of grain boundaries, and promoting the degree of uniform deformation

Active Publication Date: 2018-12-18
TANGSHAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the field of automobile manufacturing, a large number of inner and outer panels of the car body and some covering parts require the steel plate to have a certain deep drawing performance. At present, most products with deep drawing performance generally use ultra-low carbon materials, increase the continuous annealing temperature, increase the annealing time, etc. This type of steel plate has high requirements for steelmaking, and at the same time, the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In this embodiment, the low-cost high-strength formability cold-rolled annealed low-carbon steel strip has a thickness of 1.0mm, and its chemical composition and mass percentage are: C: 0.05%, Si: 0.01%, Mn: 0.17%, P: 0.018 %, S: 0.012%, ALs: 0.039%, N: 0.0040%, and the rest are Fe and inclusions within the allowable range.

[0022] The production method of low-cost and high-press formability cold-rolled annealed low-carbon steel strip of this embodiment includes smelting, continuous casting, hot rolling, cold rolling, and continuous annealing processes. The specific process steps are as follows:

[0023] (1) Continuous casting process: After the molten steel is smelted, the continuous casting slab is obtained by continuous casting. The chemical composition and mass percentage of the continuous casting slab are: C: 0.05%, Si: 0.01%, Mn: 0.17%, P: 0.018 %, S: 0.012%, ALs: 0.039%, N: 0.0040%, the rest is Fe and inclusions within the allowable range;

[0024] (2) Hot roll...

Embodiment 2

[0029] In this example, the low-cost high-strength formability cold-rolled annealed low-carbon steel strip has a thickness of 1.2 mm, and its chemical composition and mass percentage are: C: 0.04%, Si: 0.02%, Mn: 0.18%, P: 0.013 %, S: 0.009%, ALs: 0.042%, N: 0.0040%, and the rest are Fe and inclusions within the allowable range.

[0030] The production method of low-cost and high-press formability cold-rolled annealed low-carbon steel strip of this embodiment includes smelting, continuous casting, hot rolling, cold rolling, and continuous annealing processes. The specific process steps are as follows:

[0031] (1) Continuous casting process: After the molten steel is smelted, the continuous casting slab is obtained by continuous casting. The chemical composition and mass percentage of the continuous casting slab are: C: 0.04%, Si: 0.02%, Mn: 0.18%, P: 0.013 %, S: 0.009%, ALs: 0.042%, N: 0.0040%, the rest is Fe and inclusions within the allowable range;

[0032](2) Hot rolling...

Embodiment 3

[0037] In this example, the low-cost high-strength formability cold-rolled annealed low-carbon steel strip has a thickness of 1.6mm, and its chemical composition and mass percentage are: C: 0.06%, Si: 0.02%, Mn: 0.19%, P: 0.013 %, S: 0.011%, ALs: 0.039%, N: 0.0035%, and the rest are Fe and inclusions within the allowable range.

[0038] The production method of low-cost and high-press formability cold-rolled annealed low-carbon steel strip of this embodiment includes smelting, continuous casting, hot rolling, cold rolling, and continuous annealing processes. The specific process steps are as follows:

[0039] (1) Continuous casting process: After the molten steel is smelted, the continuous casting slab is obtained by continuous casting. The chemical composition and mass percentage of the continuous casting slab are: C: 0.06%, Si: 0.02%, Mn: 0.19%, P: 0.013 %, S: 0.011%, ALs: 0.039%, N: 0.0035%, the rest is Fe and inclusions within the allowable range;

[0040] (2) Hot rolling...

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Abstract

The invention discloses a production method of a cold-rolled annealed low-carbon steel strip with low cost and high stamping forming performance. The production method includes the procedures of smelting, continuous casting, hot rolling, cold rolling and continuous annealing. In the hot rolling procedure, the heating temperature of a hot-rolled plate blank is 1,050-1,200 DEG C, the heating time is70-200 min, the hot rolling finish rolling temperature is 810-850 DEG C, and the coiling temperature is 710-750 DEG C. In the cold rolling procedure, the cold rolling rolling speed is controlled at 800-1,200 m/min. The content of the solid solution C in steel is controlled by controlling hot rolling process parameters, it is promoted that {111} recrystallized grains fully grow by controlling thecold rolling and annealing temperatures, and the stamping forming performance is improved. No high-cost alloys such as niobium and titanium are added into used chemical components, it is not needed toincrease the cold rolling reduction rate or increase the annealing temperature, and the production method has the beneficial effects that the cost is low, and production is easy to control.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a production method of a cold-rolled annealed low-carbon steel strip with low cost and high stamping formability. Background technique [0002] With the rapid development of my country's automobile industry, the output of automobile steel has been significantly increased in recent years. At the same time, the automobile industry's requirements for the stamping formability of steel plates have also increased. [0003] In the field of automobile manufacturing, a large number of inner and outer panels of the car body and some covering parts require the steel plate to have a certain deep drawing performance. At present, most products with deep drawing performance generally use ultra-low carbon materials, increase the continuous annealing temperature, increase the annealing time, etc. This type of steel plate has high requirements for steelmaking, and at the same time, ...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C22C38/06C21D8/02C21D1/26
CPCC21D1/26C21D8/0226C21D8/0236C21D8/0273C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06
Inventor 姚勇创李建英孙璐王言锋马光宗马德刚张斌韩冰武冠华
Owner TANGSHAN IRON & STEEL GROUP
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