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Production method for continuous annealing process high strength and plasticity automobile steel plate

A high-strength plastic product, automotive steel plate technology, used in manufacturing tools, heat treatment equipment, heat treatment furnaces, etc., can solve the problems of long annealing time, inability to achieve continuous annealing of steel plates, long annealing time, etc., to shorten the annealing time, meet the Effects of continuous annealing production requirements

Active Publication Date: 2013-02-06
CENT IRON & STEEL RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The austenite reverse phase transformation annealing process (hereinafter referred to as ART-annealing) is the key process for realizing the invention, but the time required for annealing is relatively long, and the ART-annealing time for obtaining a good level of strength and plasticity requires more than 30 minutes, which cannot be realized Production of continuous annealing and surface coating processes for steel plates
The above-mentioned process is ART-annealing on the basis of the quasi-equilibrium structure of the steel plate. The controlling factors of the annealing time are the austenite nucleation speed and the diffusion speed of Mn, which are the fundamental reasons for the long annealing time.

Method used

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  • Production method for continuous annealing process high strength and plasticity automobile steel plate
  • Production method for continuous annealing process high strength and plasticity automobile steel plate
  • Production method for continuous annealing process high strength and plasticity automobile steel plate

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Experimental program
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Embodiment

[0033] (1) Smelting of steel:

[0034] The steel of the present invention is smelted by a laboratory vacuum induction furnace, and the casting ingot shape is a 150kg round ingot. A total of 7 furnaces of steel were smelted, and 8# was produced by 80-ton converter + LF + RH + continuous casting + hot rolling. The chemical composition is shown in Table 1.

[0035] Table 1 Chemical Composition of Invention Steel

[0036]

[0037] (2) Forging and hot rolling of steel:

[0038] The steel ingots of 1-7# steel are heated at 1100-1250°C, kept for 2-5 hours, and then forged and billeted. The forging temperature range is 800-1150°C, air cooling after forging. Finally, it is forged into a billet with a size of 30mm×100mm×150mm. The above-mentioned forged billet is heated at 1100-1250°C and kept for 2-5 hours. The starting temperature of the billet is 1050-1100°C. It is rolled by a test hot rolling mill for 7 passes. The final rolling temperature is 750-950°C. Afterwards, air-cool...

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Abstract

The invention discloses a production method for a continuous annealing process high strength and plasticity product automobile steel plate, which belongs to the technical field of automobile steel. By increasing the deformation energy storage of a cold-rolled steel plate and acquiring nonequilibrium structure, the time for reverting austenite is reduced greatly, a condition for obtaining better strength and plasticity product in an annealing and heat preservation time period of 1 to 10 minutes is created, and the process conditions of the conventional automobile steel cold-rolled plate continuous annealing and continuous galvanizing production equipment are met. In addition, through structural heredity, the strength and plasticity product of a cold-rolled reversed austenite annealing steel plate is improved by over 10 percent compared with that of reversed austenite annealing hot-rolled steel plate.

Description

technical field [0001] The invention belongs to the technical field of steel for automobiles, and in particular provides a production method for high-strength and plastic-deposited automobile steel plates suitable for continuous annealing process. Background technique [0002] High-strength and high-plasticity materials have always been the persistent pursuit of material workers, especially with the improvement of automotive lightweight and safety requirements, steel for automotive structural parts is required to have a high strength-plastic product (the product of tensile strength and elongation). The strength and plasticity of the first generation of automotive steel is at the level of 10-20GPa%, which can no longer meet the dual requirements of lightweight and high safety for the future development of the automotive industry. In order to meet the needs of automobile lightweight and improve safety, in recent years people have successively developed high-strength and high-p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/12C22C38/14C22C38/38C22C38/16C21D9/52
Inventor 董瀚干勇翁宇庆曹文全时捷王存宇徐乐李晓源王毛球惠卫军
Owner CENT IRON & STEEL RES INST
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