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Production method of ultrafine microstructure hot rolling carbon steel strip with yield strength of 355MPa

A technology of yield strength and manufacturing method, which is applied in the field of steel manufacturing, can solve problems such as damage to toughness, and achieve the effects of improved toughness, low hardenability tendency, and good forming

Inactive Publication Date: 2008-11-19
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] There are many ways to improve the strength of steel materials, but grain refinement is the only method that can improve both strength and toughness. Other ways to improve strength will damage toughness

Method used

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  • Production method of ultrafine microstructure hot rolling carbon steel strip with yield strength of 355MPa
  • Production method of ultrafine microstructure hot rolling carbon steel strip with yield strength of 355MPa
  • Production method of ultrafine microstructure hot rolling carbon steel strip with yield strength of 355MPa

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Embodiment Construction

[0030] The present invention will be further described below in conjunction with embodiment:

[0031] Table 3 lists the chemical compositions of five specific examples that the present invention can be used to produce ultra-fine carbon steel hot-rolled sheets. The production methods of these five ultra-fine carbon steels are as follows: top-bottom compound blowing is carried out on a 90-ton converter in a steelmaking plant, and hot metal desulfurization technology is used to make the S in the hot metal ≤ 0.005%, and the molten steel is treated with calcium to make the steel The chemical composition in it meets the requirements in Table 1 (see Table 3 for the actual composition), and the balance is Fe and unavoidable inclusions; then pour the molten steel with the composition shown in Table 3 into a slab with a section of 210-230mm×1150-1300mm. Then the slab is sent to the hot rolling plant, and the ultra-fine grain rolling process is used for hot rolling on a 1700mm rolling mi...

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Abstract

The invention relates to a method for manufacturing a hot rolling carbon steel strip with 355Mpa-grade yield strength and ultrafine microstructure. The method includes five steps of slab heating, slab rough-rolling, slab precision-rolling, laminar cooling and coiling, wherein the slab heating temperature ranges from 1,080 DEG C to 1,120 DEG C; the outlet temperature of the slab rough-rolling ranges from 960 DEG C to 1,000 DEG C; the finishing rolling temperature ranges from 760 DEG C to 800 DEG C; the coiling temperature ranges from 450 DEG C to 800 DEG C; and the laminar cooling is controlled at a cooling rate of high than or equal to 20 DEG C / s. On the premise that the chemical composition and the production condition of the present carbon steel with approximately 200Mpa-grade remain almost unchanged, the method of the invention allows the carbon steel to be refined to a grain size of lower than 5 microns, and allows the yield strength of the steel to be increased to the 355Mpa-grade; the toughness of the steel plate is greatly improved, therefore, the carbon steel strip has good performance of shaping, welding and so on, and is widely applicable to the manufacture of the automobile structural member.

Description

technical field [0001] The invention relates to a method for manufacturing steel, in particular to a method for manufacturing a hot-rolled carbon steel strip with a yield strength of 355 MPa. Background technique [0002] Iron and steel materials have excellent performance, low price, and easy recycling. They are the most traditional and main structural manufacturing materials. However, with economic development and social progress, the production of iron and steel materials is facing tremendous pressure from issues such as resources, energy and the environment, and is also facing fierce competition from other materials. Therefore, since the end of the last century, many countries in the world have successively carried out the research and development of a new generation of steel materials (or super steel), aiming at greatly improving the strength, toughness and service life of steel materials; further improving the cost performance of steel materials, Realize low-cost and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/22B21B37/74
Inventor 彭涛钟定忠陈邦文刘清友孙新军苏毅柳志敏刘吉斌李平和陈良孙方义刘浩
Owner 武钢集团有限公司
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