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Vehicle high strength and toughness hot-forming steel plate and preparation method thereof

A high-strength toughness, hot forming technology, applied in the field of high-strength automotive steel, can solve the problems of insufficient toughness and high strength, and achieve the effects of saving resources, good strength and toughness, and reducing costs

Inactive Publication Date: 2013-08-21
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the shortcoming of high strength but insufficient toughness of the hot-formed steel plate after forming, and provide a high-strength and toughness hot-formed steel plate for automobiles and its preparation method, specifically through the quenching and partitioning process (Quenching and Partitioning, Q&P) method, so that the steel plate finally obtains a dual-phase composite structure of martensite + retained austenite, improving its toughness

Method used

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  • Vehicle high strength and toughness hot-forming steel plate and preparation method thereof
  • Vehicle high strength and toughness hot-forming steel plate and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0021] A high-strength and toughness hot-formed steel plate for automobiles, its components and weight percentages are: C: 0.25%, Si: 0.90%, Mn: 1.78%, Ti: 0.022%, B: 0.0021%, S: 0.0013%, P : 0.0058%, the rest is Fe. Heat the steel to the austenitizing temperature of 880°C at a rate of 25°C / s and hold it for 5 minutes, and then heat it for 1s -1 The strain rate was hot-rolled with a strain deformation of 0.8, then quenched to 310°C at a rate of 50°C / s, isothermally held at a tempering temperature of 310°C for 5s, and finally quenched to room temperature. After testing, the tensile strength Rm of the steel is 1534MPa, and the yield strength Rp 0.2 It is 862MPa, and the total elongation is 12.8%.

Embodiment 2

[0023] A high-strength and toughness hot-formed steel plate for automobiles, its components and weight percentages are: C: 0.25%, Si: 0.90%, Mn: 1.78%, Ti: 0.022%, B: 0.001%, S: 0.0013%, P : 0.0058%, the rest is Fe. Heat the steel at a rate of 50°C / s to the austenitizing temperature of 1000°C and hold it for 2 minutes, then -1 The strain rate is 0.8 for hot rolling, then quenched to 300°C at a rate of 80°C / s, isothermally held at a tempering temperature of 300°C for 30s, and finally quenched to room temperature. After testing, the tensile strength Rm of the steel is 1633MPa, and the yield strength Rp 0.2 It is 952MPa, and the total elongation is 14.9%.

Embodiment 3

[0025] A high-strength and toughness hot-formed steel plate for automobiles, its components and weight percentages are: C: 0.30%, Si: 0.50%, Mn: 2.4%, Ti: 0.01%, B: 0.005%, S: 0.0013%, P : 0.0058%, the rest is Fe. Heat the steel to the austenitizing temperature of 850°C at a rate of 100°C / s and hold it for 30 minutes, then -1 The strain rate is 0.8 for hot rolling, then quenched to 290°C at a rate of 100°C / s, isothermally held at a tempering temperature of 290°C for 50s, and finally quenched to room temperature. After testing, the tensile strength Rm of the steel is 1696MPa, and the yield strength Rp 0.2 It is 932MPa, and the total elongation is 15.7%.

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Abstract

The invention belongs to the technical field of high strength vehicle steels, and provides a vehicle high strength and toughness hot-forming steel plate. In the prior art, a hot forming steel plate has high strength and insufficient toughness after forming. A purpose of the present invention is to overcome the disadvantage in the prior art. Main components of the vehicle high strength and toughness hot-forming steel plate comprise: 0.1-0.5 wt% of C, 0.5-1.5 wt% of Si, 1.2-2.4 wt% of Mn, 0.01-0.05 wt% of Ti, 0.001-0.005 wt% of B, les than or equal to 0.01 wt% of S, less than or equal to 0.01 wt% of P, and the balance of Fe. The preparation method comprises: heating the steel plate steel comprising the components at a speed of 20-100 DEG C / s to achieve an austenization temperature, carrying out constant temperature maintaining for a certain time, and carrying out hot rolling so as to refine austenite grains; quenching at a speed of 50-120 DEG C / s to achieve a temperature of 50-370 DEG C to obtain partial supersaturated martensite and residual austenite with no martensite phase change; carrying out an isothermal treatment for 5-600 s at a tempering temperature of 200-500 DEG C, such that carbon is stably distributed from the martensite to the residual austenite so as to stabilize the austenite; and quenching to a room temperature to obtain a complex phase structure of the refined martensite and the residual austenite. The preparation method has characteristics of simple preparation process, easy operation and low cost, and is suitable for industrial promotion, wherein the prepared high strength and toughness complex phase steel has superior performances.

Description

technical field [0001] The invention belongs to the technical field of high-strength steel for automobiles, and specifically relates to a high-strength and toughness hot-formed steel plate for automobiles and a preparation method thereof. The prepared steel plate has excellent strength and toughness properties. Background technique [0002] The development of high-strength automotive steel with low cost, good processing performance and excellent service performance is the only way to save energy and reduce emissions while maintaining vehicle safety. However, high-strength steel plates have high strength, such as stamping deformation at room temperature, severe springback, easy to crack, and difficult stamping of parts with complex shapes. At present, a new process of hot stamping using hardenable boron steel plate can overcome the above difficulties, and has become a hot spot that many automobile manufacturers and researchers in the world pay attention to. The hot stamping ...

Claims

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Application Information

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IPC IPC(8): C22C38/14C21D8/02C21D1/18
Inventor 刘和平孙虎儿刘斌李志勇孙凤儿
Owner ZHONGBEI UNIV
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