High-performance cold rolled phase transformation plasticity steel and preparation method thereof

A high-performance, plastic steel technology, applied in the field of alloy steel, can solve problems such as deterioration of the surface quality of the slab, and achieve the effects of avoiding surface defects, high strength, and good plasticity

Inactive Publication Date: 2009-12-30
ANGANG STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the increase of Al and N content ...

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  • High-performance cold rolled phase transformation plasticity steel and preparation method thereof
  • High-performance cold rolled phase transformation plasticity steel and preparation method thereof

Examples

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Effect test

Embodiment 1

[0016] The chemical composition of the high-performance cold-rolled phase transformation plastic steel used in Example 1 of the present invention is shown in Table 1. The preparation process is as follows: the steel billet with the above composition is cold-rolled to make a steel plate with a thickness of 1.8mm; the steel plate is heated to 800°C for 180 seconds in a heat treatment furnace, and then rapidly cooled to 400°C at 30°C / s and isothermal for 550 seconds, and finally air-cooled to room temperature at 10°C / s to obtain a high-performance cold-rolled phase transformation plastic steel.

[0017] After testing, the relative amount (volume percentage) of the microstructure of the steel plate after heat treatment is: 62% ferrite, 8% retained austenite, and the balance is bainite. The mechanical properties of the steel plates after heat treatment are shown in Table 2. It is not difficult to see from Table 2 that the high-performance cold-rolled phase-change plastic steel obt...

Embodiment 2

[0019] The chemical composition of the high-performance cold-rolled phase transformation plastic steel used in Example 2 of the present invention is shown in Table 1. The preparation process is as follows: the steel billet with the above composition is cold-rolled to make a steel plate with a thickness of 1.0mm; the steel plate is heated to 760°C for 90 seconds in a heat treatment furnace, and then rapidly cooled to 460°C at 40°C / s ℃ and isothermal for 50 seconds, and finally oil-cooled to room temperature at 20°C / s to obtain high-performance cold-rolled phase-change plasticity steel.

[0020] After testing, the relative amount (volume percentage) of the microstructure of the steel plate after heat treatment is: 73% ferrite, 13.2% retained austenite, and the balance is bainite. The mechanical properties of the steel plates after heat treatment are shown in Table 2. It is not difficult to see from Table 2 that the high-performance cold-rolled phase-change plasticity steel obta...

Embodiment 3

[0022] The chemical composition of the high-performance cold-rolled phase transformation plastic steel used in Example 3 of the present invention is shown in Table 1. The preparation process is as follows: the steel billet with the above composition is cold-rolled to make a steel plate with a thickness of 1.5 mm; the steel plate is heated to 780 °C for 90 seconds in a heat treatment furnace, and then rapidly cooled to 430 °C at 30 °C / s ℃ and isothermal for 300 seconds, and finally air-cooled to room temperature at 10°C / s to obtain a high-performance cold-rolled phase transformation plastic steel.

[0023] After testing, the relative amount (volume percentage) of the microstructure of the steel plate after heat treatment is: 64% ferrite, 11.6% retained austenite, and the balance is bainite. The mechanical properties of the steel plates after heat treatment are shown in Table 2. It is not difficult to see from Table 2 that the method of the present invention has obtained a high...

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Abstract

The invention provides a high-performance cold rolled phase transformation plasticity steel, which comprises the following chemical compositions: 0.05 to 0.3 percent of C, 0.1 to 0.6 percent of Si, 0.5 to 2.0 percent of Mn, 0.01 to 0.1 percent of P, 0.01 to 0.5 percent of V, 0.01 to 0.03 percent of N and the balance of Fe and inevitable impurities. The preparation method comprises that: (1) after converter smelting, precision rolling and slab continuous casting, the steel is subjected to hot rolling, the finishing temperature is between 750 and 900DEG C, the coiling temperature is between 550 and 700DEG C, and then the steel is subjected to cold rolling in rolling reduction between 40 and 80 percent to be made into a steel plate with the thickness between 0.5 and 2.0mm; and (2) the steel plate is subjected to heat treatment, namely the steel plate is kept isothermally at a temperature of between 700 and 850DEG C for 0.5 to 6 minutes, cooled to between 300 and 500DEG C in a rate of between 10 and 50DEG C/s, kept isothermally for 0.5 to 10 minutes, and finally cooled by air or oil to room temperature in a rate of between 5 to 20DEG C/s. The high-performance cold rolled phase transformation plasticity steel adopts special composition design and heat treatment process, so that low-silicon and low-carbon steel not containing Al has excellent strength-plasticity, good weldability, hot dip property and surface quality of casting blanks.

Description

technical field [0001] The invention belongs to the technical field of alloy steel, and in particular relates to a high-performance cold-rolled phase-change plastic steel and heat treatment processing technology thereof. Background technique [0002] Due to energy and environmental issues, the automotive industry has changed the weight of vehicles. People began to replace mild steel with high-strength steel (HSS). This substitution can effectively reduce vehicle weight and fuel consumption without reducing safety and reliability. Among these high-strength steels, transformation-induced plasticity (TRIP: Transformation Induced Plasticity) steel can induce plasticity through the phase transformation from retained austenite to martensite due to its unique strengthening and toughening mechanism. Tensite enhances the strength of the material, which can make the material have high strength and toughness at the same time. The preparation method of TRIP steel is divided into hot ro...

Claims

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Application Information

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IPC IPC(8): C22C38/12B21B1/46B21B37/74B21B37/16C21D9/00
Inventor 刘仁东李麟唐复平史文王义栋张梅严玲符仁钰王越何燕霖黄大鹏许珞萍刘玠
Owner ANGANG STEEL CO LTD
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