Method for manufacturing high-strength steel through hot rolling and on-line thermal treatment

A high-strength steel and hot-rolled plate technology, applied in the field of hot-rolled direct quenching and two-phase zone annealing, can solve the problems of continuous casting and rolling difficulties, high economic costs, and low production efficiency, and achieve broad research and application prospects, The effect of simple production process and simple alloy composition

Active Publication Date: 2014-09-10
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the process of hot rolling first, then cold rolling, and then bell annealing is mainly used, and the production efficiency is low; and

Method used

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  • Method for manufacturing high-strength steel through hot rolling and on-line thermal treatment
  • Method for manufacturing high-strength steel through hot rolling and on-line thermal treatment
  • Method for manufacturing high-strength steel through hot rolling and on-line thermal treatment

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Example Embodiment

[0020] The cast slab with the composition shown in Table 1 was heated to 1200°C for holding, followed by multiple passes of hot rolling, and the final rolling temperature was 870°C. Immediately afterwards, a rapid quenching treatment was performed on the laminar cooling device to cool to below the Ms point), and a complete martensitic structure was obtained. The photo of the structure is as attached figure 2 Shown.

[0021] Table 1 is the mass percentage of the experimental steel composition

[0022] Table 1 Test steel composition / wt%

[0023] Numbering

[0024] Subsequently, the quenched hot-rolled sheet was continuously annealed at 780°C, 800°C and 820°C. After holding for 10 minutes, it was cooled to 400°C for 100s at a cooling rate of 30°C / s, and then quickly cooled to room temperature. The properties corresponding to different process parameters are shown in Table 2, and the organization diagrams of Examples 2 and 3 of the invention are shown in the attachment. image 3 , ...

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Abstract

The invention relates to a method for manufacturing high-strength steel through hot rolling and on-line thermal treatment and belongs to the field of thermal treatment of metal materials. The method is characterized by comprising the following steps: immediately carrying out online waste heat quenching treatment on a hot rolled plate after hot rolling finishing by using low- and medium-carbon steel containing 0.5-3.5wt% of Mn to obtain a complete martensite or a part of ferrite+martensite organization structure; then carrying out online heating to a two-phase region and preserving heat to obtain a great deal of austenite among battens; then, quickly cooling to a partition region and partitioning so as to stabilize the austenite; and finally, quickly cooling to room temperature. The room-temperature tissues of the hot rolled plate produced by the process comprise an alpha phase with a quenching martensite form, retained austenite among battens, lath martensite/retained austenite island tissues and a ferritic structure formed before quenching. The tensile strength of the complex structure containing the retained austenite among battens can reach 800-1350MPa, the ductility reaches 20-35% and the product of strength and elongation can reach over 30GPa.%.

Description

technical field [0001] The invention belongs to the field of metal material production, and relates to a room-temperature microstructure composed of α phase retaining the form of quenched martensite lath, retained austenite between laths, granular martensite / retained austenite island structure and The invention relates to a high-strength and high-plasticity hot-rolled plate with a ferrite structure formed before quenching, and a production method of hot-rolling direct quenching and two-phase zone annealing. Background technique [0002] The development trend of the new generation of automobiles is energy saving, consumption reduction, environmental protection and safety. Therefore, the car must rely on reducing its own weight to reduce fuel consumption and reduce emissions under the premise of ensuring safety. Data show that every 10% reduction in the mass of the car itself can save 3% to 7% of fuel. In order to develop high-strength steel sheets for automobiles and promot...

Claims

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Application Information

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IPC IPC(8): C21D8/02C22C38/04C22C38/02
Inventor 陈银莉丁然赵爱民孟祥张鑫宇张聪佟婷婷尹衍军何建国
Owner UNIV OF SCI & TECH BEIJING
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