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Low carbon silicon cold rolling phase variable plastic steel and production thereof

A low-carbon, low-silicon, plastic steel technology, applied in manufacturing tools, heat treatment equipment, heat treatment baths, etc., can solve the problems of low strength, difficulty in achieving the performance of traditional TRIP steel, and poor performance of phosphorus-containing TRIP steel

Inactive Publication Date: 2005-07-27
SHANGHAI UNIV
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

However, the strength of aluminum-containing low-carbon and low-silicon TRIP steel is low, and other properties of phosphorus-containing TRIP steel are poor, and it is difficult for them to achieve the performance of traditional TRIP steel.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: The composition and weight percentages of the low-carbon and low-silicon cold-rolled phase transformation plastic steel used in this embodiment are:

[0019] C 0.11%, Si 0.5%,

[0020] Mn 0.8% Al 1.01%,

[0021] V 0.1% S 0.007%

[0022] P 0.006% N 0.0018%,

[0023] Fe balance.

[0024] The technological process and steps of its preparation are as follows:

[0025] The steel billet with the above composition is cold-rolled to make a steel plate with a thickness of 1.2mm; then the steel plate is heat-treated, first kept isothermally at 760°C for 5 minutes, then rapidly cooled to 400°C, and isothermally continued at this temperature Keep it for 5 minutes; finally immerse it in oil, and cool the oil to room temperature to obtain low-carbon and low-silicon cold-rolled phase transformation plastic steel.

[0026] According to instrumental testing, the relative microstructure (volume percentage) of the heat-treated steel plate is: ferrite...

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Abstract

The invention was involved in the method of preparation of cold roll phase changing plastic steel that has a low ratio of C and Si. The mass ratio of ingredient was: C 0.1-0.2%, Si 0.1-0.5%, Mn 0.5-2.0%, Al 0.5-1.5%, V 0.05-0.5%, microcontent of S, P, N, the residue is Fe. Process: cold rolling billet steel was made up steel plate that has a thickness of 0.05-1.5mm, the steel plate was heated at 700-800 deg.C for 2-10 min, then quickly cooled in to 350-500 deg.C and thermal retardation for 2-10 min; It was immersed nito the oil and cooled it to room-temperature. Its advantages include a good plastic nature; the value motor than 20000 MPa%, the strength of extension was 650-670 Mpa, extensibility 32.5-34%.

Description

technical field [0001] The invention relates to a low-carbon and low-silicon cold-rolled phase-change plastic steel and a preparation method thereof. It belongs to the technical field of special steel heat treatment processing. Background technique [0002] Due to energy and environmental issues, the automobile industry has changed the weight of vehicles. People began to replace mild steel with high-strength steel. This substitution can effectively reduce vehicle weight and fuel consumption without reducing safety and reliability. The wave that started in the 1970s has swept through developed countries such as North America, Europe, Japan, and Australia, and developed solid steels such as dual-phase steels, precipitation hardening steels, solid solution strengthening steels, and IF steels. Solution-strengthened steel, phase-transformation-induced plasticity steel, and dual-phase steel with phase-transition-induced plasticity. Among these high-strength steels, due to its un...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/50C21D7/00C22C38/12
Inventor 李麟史文田蓉符仁钰
Owner SHANGHAI UNIV
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