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A kind of 590mpa grade high-strength low-alloy hot-rolled pickled steel strip and its production method

A high-strength, low-alloy, hot-rolled pickling technology, which is applied to 590MPa-grade high-strength low-alloy hot-rolled and pickled strip steel and its production field, and can solve the problems of reduced hole enlarging and flanging performance, etc.

Active Publication Date: 2019-09-03
SHOUGANG CORPORATION +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention provides a 590MPa grade high-strength low-alloy hot-rolled pickled steel strip and its production method to solve the technical problem of reduced performance of hole expansion and flanging

Method used

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  • A kind of 590mpa grade high-strength low-alloy hot-rolled pickled steel strip and its production method
  • A kind of 590mpa grade high-strength low-alloy hot-rolled pickled steel strip and its production method
  • A kind of 590mpa grade high-strength low-alloy hot-rolled pickled steel strip and its production method

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Embodiment Construction

[0035] This patent mainly controls the formation of ferrite-pearlite structure with appropriate volume fraction ratio and high tensile strength, hole expansion and flanging performance of appropriate texture by adopting appropriate C and Mn element content and hot rolling and cooling process system Excellent high formability low alloy hot rolled pickled strip.

[0036] In order to enable those skilled in the technical field to which the application belongs to understand the application more clearly, the technical solutions of the application will be described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0037] The invention discloses a 590MPa-level high-strength low-alloy hot-rolled pickled steel strip, in particular a ferrite-pearlite high-strength low-alloy hot-rolled pickled steel strip with excellent 590MPa-level hole expansion and flanging performance. The chemical composition is calculated by weight percentage: C: 0.05-0.1...

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Abstract

590-MPa-level high-strength low-content-alloy hot-rolled acid-washed strip steel is disclosed. The strip steel includes, by weight, 0.05-0.1% of C, not more than 0.1% of Si, 0.8-1.5% of Mn, not more than 0.02% of P, not more than 0.008% of S, and 0.01-0.05% of Nb, with the balance being Fe and unavoidable impurities. A microcosmic metallographic structure includes ferrite and pearlite, wherein thevolume ratio of the ferrite is greater than 95%. The tensile strength of the strip steel is not less than 590 MPa, and the hole expansion rate [lambda] is not less than 65%. Through the component design, a special ferrite-pearlite structure is obtained, existence of the pearlite does not worsen forming performance, growth of ferrite crystal grains is significantly inhibited, ferrite crystal grains the dimension of which is 6 [mu]m or below are obtained, and forming performance is improved. Compared with similar ferrite-pearlite steel, a product prepared by the method has sufficient strength and has excellent hole-expanding and flanging properties.

Description

technical field [0001] The application relates to the technical field of hot-rolled pickled steel strip production technology, in particular to a 590MPa high-strength low-alloy hot-rolled pickled steel strip and a production method thereof. Background technique [0002] With the development of the automobile industry, the automobile industry has higher and higher requirements for automobile lightweight and energy saving and emission reduction. The use of high-strength steel is an inevitable requirement for the development of the automobile industry. As an intermediate product between cold-rolled and hot-rolled, hot-rolled pickled products have a surface quality close to that of cold-rolled products, and have excellent comprehensive mechanical properties of hot-rolled products. The low cost of rolled products requires advantages. At present, it has been widely used in the manufacture of automotive body structural parts, chassis systems, seat systems, etc. [0003] Due to th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/04C22C38/04C22C38/12
Inventor 王智权郭子峰郭佳张冯军李玉鹏周娜陈斌于洋刘文鑫吕宝峰宋春华陈波
Owner SHOUGANG CORPORATION
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