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Cold-rolled ultrahigh-strength biphase steel plate for vehicle with corrosion resistance and preparation method thereof

A corrosion-resistant, ultra-high-strength technology, which is applied in the production and application of automotive steel and the field of metal materials, can solve the problems of high content of alloying elements and high cost, and achieve the effects of improving process performance, superior corrosion resistance, and reducing costs

Active Publication Date: 2016-05-11
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It belongs to the field of stainless steel, its content of alloy elements is relatively high, its cost is too high, its production process and performance requirements are obviously different from the steel of the present invention, and it is not suitable for the manufacture of auto parts

Method used

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  • Cold-rolled ultrahigh-strength biphase steel plate for vehicle with corrosion resistance and preparation method thereof
  • Cold-rolled ultrahigh-strength biphase steel plate for vehicle with corrosion resistance and preparation method thereof
  • Cold-rolled ultrahigh-strength biphase steel plate for vehicle with corrosion resistance and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The annealing process of Example 1 (component 1) is as follows: the preheating section is heated to 150°C at 7.4°C / s, the heating section is heated to 800°C at the holding temperature of the two-phase zone at 2.6°C / s, and the two-phase zone is kept at the holding temperature for 180s. In the slow cooling section, the steel is slowly cooled to 640°C, then rapidly cooled to 260°C at a cooling rate of 40°C / s, overaged for 368s, and then slowly cooled to room temperature.

Embodiment 2

[0037] The annealing process of embodiment 2 (component 2) is that the preheating section is heated to 180°C at 7.4°C / s, the heating section is heated to the two-phase zone holding temperature of 810°C at 2.6°C / s, and the two-phase zone is kept warm for 180s. In the slow cooling section, cool slowly to 640°C, then quickly cool to 250°C at a cooling rate of 40°C / s, perform overaging treatment for 320s, and then slowly cool to room temperature.

Embodiment 3

[0038] The annealing process of embodiment 3 (component 1) is that the preheating section is heated to 150°C at 7.4°C / s, the heating section is heated to 820°C at the holding temperature of the two-phase zone at 2.6°C / s, and the two-phase zone is kept at the holding temperature for 180s. In the slow cooling section, the steel is slowly cooled to 620°C, then rapidly cooled to 260°C at a cooling rate of 40°C / s, overaged for 368s, and then slowly cooled to room temperature.

[0039] The mechanical properties of the steel in this example are shown in Table 2, where Rp is obtained when the annealing temperature is 820°C 0.2 =1020MPa, R m =1760MPa,A 50 =8.06%, Rp 0.2 / R m =0.58 cold-rolled ultra-high-strength dual-phase steel. According to "Metal Materials Laboratory - Uniform Corrosion Full Immersion Test Method JB / T7901-2001", the industrial atmospheric environment is simulated through the uniform corrosion full immersion test, and the corrosion solution is 0.005mol / L NaHSO 3...

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Abstract

The invention discloses a cold-rolled ultrahigh-strength biphase steel plate for a vehicle with corrosion resistance and a preparation method thereof. The steel plate comprises the following chemical components in percentage by mass: 0.13-0.16% of C, 1.8-2.0% of Si, 2.3-2.5% of Mn, 1.8-2.2% of Cr, 0.010-0.025% of Al, 0.001-0.008% of S, 0.002-0.012% of P, 0.001-0.004% of N, and the balance Fe and inevitable impurity elements. The preparation method is simple in process and low in production cost; and the prepared steel plate is excellent in comprehensive mechanical performance and corrosion resistance, is better in welding performance and forming performance, and satisfies the requirements of the vehicle industry on such aspects as strength and corrosion resistance of high-strength steel.

Description

technical field [0001] The invention relates to a composition and a preparation method of a cold-rolled ultra-high-strength dual-phase steel plate for automobiles with excellent corrosion resistance, belonging to the field of metal materials, and in particular to the technical field of production and application of steel for automobiles. Background technique [0002] As the downward pressure on China's economic situation increases, the steel industry, which is the basis of China's manufacturing industry, is getting colder. The production capacity of ordinary steel products is seriously overcapacitated, and the price continues to drop. However, high-quality steel products still need to be imported. This kind of "big but not strong" has already It has become an obvious feature of the development of my country's iron and steel industry, and many high-end steel production technology problems need to be solved urgently. [0003] As a kind of advanced high-strength steel for automo...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C38/18C21D8/02
CPCC21D6/005C21D8/0226C21D8/0236C21D8/0247C21D2211/005C21D2211/008C22C38/02C22C38/04C22C38/06C22C38/18
Inventor 赵征志闫远苏岚梁江涛唐荻武会宾崔衡赵爱民梁驹华谷海容尹鸿祥
Owner UNIV OF SCI & TECH BEIJING