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1300Mpa grade high tenacity cold-formed steel plate and production method thereof

A production method and high-toughness technology, applied in the metallurgical field, can solve the problems of cold-formed parts affecting the forming quality, hot-formed parts having poor toughness, and affecting structural safety, etc.

Active Publication Date: 2021-05-14
TANGSHAN IRON & STEEL GROUP +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

From the perspective of preparation, high-strength steel generally has the problems of high production cost and narrow process window; from the perspective of processing and manufacturing, with the increase of strength, the springback problem of high-strength steel cold-formed parts is prominent and seriously affects Forming quality, while hot-formed parts have problems such as poor toughness, difficulty in subsequent processing, and delayed cracking, which seriously affect structural safety

Method used

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  • 1300Mpa grade high tenacity cold-formed steel plate and production method thereof
  • 1300Mpa grade high tenacity cold-formed steel plate and production method thereof
  • 1300Mpa grade high tenacity cold-formed steel plate and production method thereof

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Embodiment 1-9

[0020] The production method of the 1300Mpa grade high-toughness cold-formed steel plate of the present invention comprises steelmaking, continuous casting, heating, rolling, acid rolling, continuous annealing, leveling and stretching and straightening processes. The specific steps are as follows:

[0021] (1) Steelmaking process: including hot metal desulfurization and slag removal, converter smelting, LF furnace refining, RH vacuum treatment;

[0022] (2) Continuous casting process: During the casting process, control the surface and internal quality of the slab to prevent micro-cracks and secondary cracks on the surface of the slab;

[0023] (3) The heating process includes the first heating section, the second heating section, the third heating section and the soaking section. The slab stays in the furnace for 150-250 minutes, the soaking section temperature is 1200-1300°C, and the soaking time is ≥35 minutes.

[0024] (4) Rolling process, including rough rolling, hot coi...

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Abstract

The invention relates to a 1300Mpa grade high tenacity cold-formed steel plate and a production method thereof and belongs to the technical field of metallurgy. The steel plate comprises the chemical components in percent by mass: 0.1-0.2% of C, 1.8-2.5% of Mn, less than or equal to 0.005% of S, less than or equal to 0.02% of P, 1.0-1.5% of Si, less than or equal to 0.08% of Als, 0.01-0.04% of Nb, 0.02-0.08% of Ti, 1.0-2.0% of Ni and the balance Fe and inevitable impurities. The production method comprises the following steps: steelmaking, continuous rolling, heating, rolling, pickling, continuous annealing and level pulling straightening. A temperature of a soaking zone in the continuous annealing step is 760-820 DEG C, and an insulating time is 60-225s. The yield strength of the steel plate is greater than or equal to 850 MPa, a tensile strength is greater than or equal to 1300 MPa, and a ductility A50 is greater than 8%. The steel plate has a good cold-forming property and meets a requirement on light weight steel for an automobile.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a 1300Mpa high-toughness cold-formed steel plate and a production method thereof. Background technique [0002] Automobile lightweight is an effective way to achieve energy saving and emission reduction, while reducing the weight of the vehicle must also ensure vehicle safety. Due to its excellent specific strength and specific stiffness, high-strength steel has become an important basic material for the manufacture of advanced car body structures. With the in-depth understanding of alloying elements and the progress of the preparation process, the first generation of high-strength steel with strength as the main goal, the second-generation high-strength steel with high-strength plastic product as the main goal, and The third-generation advanced high-strength steel that comprehensively considers economic requirements. [0003] The use of high-strength steel has i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C21D1/26C21D6/00C21D8/02C21D9/00
CPCC22C38/04C22C38/002C22C38/02C22C38/06C22C38/12C22C38/14C22C38/08C21D1/26C21D6/001C21D6/005C21D6/008C21D8/0221C21D9/0081C21D2211/005C21D2211/008Y02P10/20
Inventor 冯晓勇邝霜刘靖宝王朝田秀刚刘丽萍李可斌冯运莉王海涛
Owner TANGSHAN IRON & STEEL GROUP
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