Steel for cross beam of easy-to-form commercial vehicle and production method of steel

A technology for commercial vehicles and crossbeams, which is applied in the field of hot-rolled automotive steel and its production, and can solve the problems of not mentioning the hole expansion performance of materials, which is not conducive to the forming performance of steel materials, etc.

Active Publication Date: 2020-04-21
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The addition of 0.16-0.20% carbon element is not conducive to improving the formability of steel, and the hole expansion performance of the material is not mentioned

Method used

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  • Steel for cross beam of easy-to-form commercial vehicle and production method of steel
  • Steel for cross beam of easy-to-form commercial vehicle and production method of steel
  • Steel for cross beam of easy-to-form commercial vehicle and production method of steel

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Embodiment Construction

[0042] The present invention is described in detail below:

[0043] Table 1 is the value list of each embodiment of the present invention and comparative examples;

[0044] Table 2 is the main process parameter list of each embodiment of the present invention and comparative example;

[0045] Table 3 is a list of the performance tests of the various embodiments of the present invention and comparative examples.

[0046] Each embodiment of the present invention is produced according to the following production process:

[0047] 1) Vacuum treatment is carried out after smelting in the converter, and the treatment time is not less than 15 minutes, and then the molten steel is continuously cast into billets;

[0048] 2) Heating the slab in sections: first preheat the slab to 800-1000°C, and the preheating period is 60-80 minutes;

[0049] Heating to 1100-1200°C within 20-40 minutes;

[0050] Finally, it enters the soaking section, the soaking temperature is controlled at 1240-...

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Abstract

The invention provides steel for a cross beam of an easy-to-form commercial vehicle. The steel comprises, by weight, 0.04-0.06% of C, 1.81-2.10% of Mn, less than or equal to 0.008% of P, less than orequal to 0.002% of S, 0.30-0.50% of Als, 0.31-0.50% of Cr, 0.03-0.05% of Ti, less than or equal to 0.003% of N. A production method comprises the following steps: (1) carrying out vacuum treatment after converter smelting; (2) carrying out sectional heating on a casting blank; (3) segmenting and rolling; (4) cooling in a two-stage cooling mode; and (4) performing finishing after being rolled. Theyield strength of the steel is greater than or equal to 650 MPa, the tensile strength of the steel is 750-880 MPa, the elongation of the steel is greater than or equal to 16%, the reaming rate of thesteel is greater than or equal to 60%, and the complex deformation requirement of the cross beam of the commercial vehicle can be met.

Description

technical field [0001] The invention relates to hot-rolled steel for automobiles and a production method thereof, in particular to steel for vehicle beams and a production method thereof. Background technique [0002] The frame is the main body of the lightweight application of commercial vehicles. The frame is composed of longitudinal beams and cross beams. Compared with the simple structural design of the longitudinal beams, the cross beams have higher requirements on the formability of materials due to their complex structure. After using high-strength steel, there is a problem of forming cracks. Currently, the main application is 500MPa-level beams. steel. There is a greater demand in the market for high-strength beam steels with higher strength grades and good formability. The hole expansion test results can better evaluate the formability of the material. [0003] After initial search: [0004] The document with the Chinese patent application number CN201310231052....

Claims

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Application Information

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IPC IPC(8): C22C38/06C22C38/04C22C38/28C21D8/02C22C33/04
CPCC21D8/0205C21D8/0226C21D8/0263C21D2211/002C21D2211/005C22C33/04C22C38/04C22C38/06C22C38/28
Inventor赵江涛李利巍陈吉清徐浩刘亮宋畅刘斌冯佳王立新
Owner武汉钢铁有限公司