Single-ferrite-precipitated steel plate with high strength and high pore-expansion property and preparation method for same

A high hole expandability, ferrite technology, applied in the field of steel manufacturing, can solve the problems of low polygonal ferrite structure strength, reduced hole expandability, etc., to improve hole expandability and elongation, improve product strength, improve Effect of hole expansion performance and elongation

Inactive Publication Date: 2019-07-02
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The polygonal ferrite structure of the present invention has low strength, and the diffusely distributed bainite structure and martensite structure will reduce its hole expansion performance

Method used

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  • Single-ferrite-precipitated steel plate with high strength and high pore-expansion property and preparation method for same
  • Single-ferrite-precipitated steel plate with high strength and high pore-expansion property and preparation method for same
  • Single-ferrite-precipitated steel plate with high strength and high pore-expansion property and preparation method for same

Examples

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Embodiment Construction

[0038] The following examples are used to specifically illustrate the contents of the present invention, and these examples are only general descriptions of the contents of the present invention, and do not limit the contents of the present invention.

[0039] Table 1 is the mass percentage of each chemical element in the steel of the example; Table 2 is the manufacturing process parameters of the steel plate of the example; Table 3 is the microstructure and mechanical properties of the steel plate of the example.

[0040] The mass percentage composition (wt%) of each chemical element in the steel of table 1 embodiment

[0041] Example C Si mn P S Cr Mo Nb Ti Ca Mg V N als 1 0.05 0.22 2.10 0.014 0.0055 0.28 0.1 0.03 0.05 0.0019 0.0019 0.13 0.0033 0.042 2 0.08 0.61 1.80 0.011 0.0058 0.22 0.05 0.02 0.08 0.0032 0.0032 0.0029 0.042 3 0.10 0.25 2.15 0.012 0.0042 0.3 0.05 0.10 0.0021 0.0021 0.0017...

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Abstract

The invention discloses a single-ferrite-precipitated steel plate with high strength and a high pore-expansion property and a preparation method for the same. Steel comprises 0.05%-0.12% of C, 0.1%-0.7% of Si, 0.8%-2.2% of Mn, 0.05%-0.10% of Ti, less than 0.035% of P, less than 0.035% of S, 0.015%-0.060% of Als, 0.0015%-0.0050% of Ca, less than 0.0050% of Mg and less than 0.005% of N, at least oneof ingredients including 0.15%-0.3% of Cr and 0.05%-0.3% of Mo, at least one of ingredients including 0.02%-0.06% of Nb and 0.05%-0.25% of V as well as the balance being Fe and inevitable impurities.The linear speed of Si-Ca feeding is more than or equal to 3.5m/s, and a superheat degree of the molten steel is less than or equal to 30 DEG C; and the heating temperature of a casting blank is 1150-1250 DEG C, the multi-pass rolling total reduction rate is more than or equal to 80%, the final rolling temperature of hot rolling is 850-950 DEG C, the after-rolling cooling rate is 15-45 DEG C/s, and the rolling temperature is 550-650 DEG C. The finished steel plate has the good pore-expansion property.

Description

technical field [0001] The invention belongs to the technical field of steel production, and in particular relates to a method for producing ferrite-precipitated steel with good hole expansion performance by adopting controlled rolling and controlled cooling. Background technique [0002] The modern automobile manufacturing industry is committed to improving the safety and crash performance of automobiles, reducing fuel consumption, thereby improving passenger safety and reducing the impact on the environment. The research and development and application of high-strength automotive steel is an effective means to realize the lightweight of automobiles. It is in line with the development trend of energy saving, consumption reduction, environmental protection and safety of the new generation of automobiles, and is the leading direction of future material technology development. However, with the increasing requirements of automobile design, the shape of parts is more complex, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/38C22C38/28C22C38/22C22C38/26C22C38/24C22C38/14C22C38/12C21D8/02
CPCC21D8/0226C21D2211/005C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/22C22C38/24C22C38/26C22C38/28C22C38/38
Inventor 张宇时晓光董毅韩斌孙成钱刘仁东郝志强丁燕勇孟凡志
Owner ANGANG STEEL CO LTD
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