High-strength steel rolling hot-forming technology

Abstract

The invention relates to a high-strength steel rolling hot-forming technology. The high-strength steel rolling hot-forming technology comprises the following steps of: (a) hot-forming of a steel belt, wherein the steel belt comprises the following components in parts by weight: 0.007-0.33% of C, 0.02-0.05% of Al, 0.001-0.005% of B, 0.16-0.37% of Cr, 0.75-1.21% of Mn, 0.004-0.006% of N, 0.01-0.1% of Ni, 0.20-0.40% of Si, 0.03-0.05% of Ti and the balance of Fe and inevitable impurities; (b) uncoiling: cutting the hot-formed steel belt into sheet materials with the length and width which are required for products; (c) forming: transferring the sheet materials into rolling and forming equipment, and performing the sheet materials into semifinished products at a room temperature; (d) heating: controlling heating temperature to 800-1100 DEG C, and preserving heat for 3-8 minutes; and (e) setting: transferring the semifinished products at a high temperature to setting equipment, carrying out pressure maintaining and quenching under a loading condition, i.e. quenching at a cooling speed of above 27 DEG C/s, cooling to a room temperature, and obtaining a martensitic structure with the tensile strength of above 1500 Mpa by quenching.

Description

technical field [0001] The invention relates to an ultra-high-strength steel forming technology, in particular to a high-strength steel rolling hot forming process, and the obtained ultra-high-strength steel has a tensile strength as high as 1500 MPa or more. Background technique [0002] At present, the forming technologies of high-strength steel mainly include: hydraulic forming, laser tailor welding forming, hot stamping forming and roll forming and other technologies. [0003] The process of hot forming steel is to use the hot forming steel whose initial structure is ferrite and pearlite, and the tensile strength is about 600MPa. The workpiece is transformed into martensite through the stamping process. After the workpiece is formed, the tensile strength is as high as 1500MPa . [0004] At present, the equipment carrier for the development and forming of hot-formed steel is mainly based on the stamping process, which we call the hot stamping forming process. However, fo...

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Problems solved by technology

[0004] At present, the equipment carrier for the development and forming of hot-formed steel is mainly based on the stamping process, which we call the hot stamping forming process. However, for the hot stamping forming process, the forming equipment is expensive, the mold needs to be heated, and the wear is serious, and the production cycle is slow. Low yield

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