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High-strength steel treatment technology

A technology for processing high-strength steel, applied in the field of high-strength steel processing technology, can solve the problems such as the difficulty of direct application of Q-P technology, and achieve the effects of fine grain size, cost reduction and high strength

Active Publication Date: 2018-07-10
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In order to solve the above-mentioned technical problems, the object of the present invention is to provide a high-strength steel treatment process to solve the problem that the Q-P process is difficult to be directly applied in the steel rolling production process

Method used

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  • High-strength steel treatment technology
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Embodiment Construction

[0025] A high-strength steel treatment process, comprising the steps of:

[0026] Heat the billet to 108°C, the rough rolling pass deformation is 25-45%, the finish rolling total deformation is 50-60%, the final rolling temperature is 840°C, the final rolling plate thickness is 2-5mm, with 50-200 Cooling at a cooling rate of ℃ / s until the coiling temperature is 720-610℃ (660℃), coiling, and then cooling naturally; then cold rolling to 1-2mm, continuous annealing of the cold-rolled plate, the annealing temperature 580-680°C (heating rate: 10-100°C / s), holding time 30s, then air cooling;

[0027] Wherein the billet includes the following percentages of chemical composition: C 0.18-0.22%, Si 1.3-1.8%, Mn 1.3-3.8%, Cu 0.4-0.55%, Ni 0.32-0.4%, P≤0.05%, S≤0.03 %, the balance is Fe and unavoidable impurities.

[0028] The preferred steel slab includes the following percentages of chemical composition: C 0.2%, Si 1.5%, Mn 2.5%, Cu 0.47%, Ni 0.36%, P≤0.05%, S≤0.03%, and the balance i...

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Abstract

The invention discloses a high-strength steel treatment technology. A steel blank is heated to 1,100 DEG C-1,150 DEG C, the rough-rolling-pass deformation is 25%-45%, the fine-rolling total deformation is 50%-60%, the finish rolling temperature ranges from 830 DEG C to 850 DEG C, the finish rolling plate thickness is 2-5 mm, cooling is conducted to the rolling temperature ranging from 610 DEG C to720 DEG C with the cooling speed of 50-200 DEG C / s, rolling is conducted, and then natural cooling is conducted; and then cold cooling is conducted to 1-2 mm, a panel obtained after cold rolling is subjected to continuous annealing, the annealing temperature is 580-680 DEG C, the heat preservation time is 20-40 s, and then air cooling is conducted. Through coordination of the rolling temperatureand the component proportion and a two-phase region formed in the rolling cooling process, alloy elements participate in austenite diffusion in the heat preservation process, accordingly, the alloy element allocation process is finished, and strength is improved.

Description

technical field [0001] The invention relates to a high-strength steel treatment process. Background technique [0002] Regarding the preparation of high-strength steel by Q-P process in steel mills, the following methods are mainly used: [0003] 1. Carry out continuous annealing for cold-rolled products, and realize the diffusion of carbon atoms in the matrix into austenite during continuous annealing, so as to increase the stability of austenite. The final structure of the product contains retained austenite, allowing transformation-induced plasticity to occur during subsequent deformation. There is a problem that the proportion of martensite in the final structure is not high, resulting in low product strength. [0004] 2. Bell-type annealing is carried out on the cold-rolled products. During the bell-type annealing process, the manganese element is diffused into the austenite, and the manganese content in the austenite is increased, so that the final structure of the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/00C22C38/02C22C38/04C22C38/16C22C38/08
CPCC21D8/005C21D2211/001C21D2211/008C22C38/02C22C38/04C22C38/08C22C38/16
Inventor 李红斌田亚强郑小平宋进英陈连生
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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