Hot-rolled pickled steel strip with high broaching performance and production method thereof

A hot-rolled pickling and production method technology, applied in the field of steelmaking, can solve the problems of low hole expansion performance and low elongation performance, and achieve the effects of high hole expansion rate, improved hole expansion rate, and excellent strip surface quality.

Active Publication Date: 2017-03-22
SHOUGANG CORPORATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although traditional ferrite + martensite (F+M) has high ductility, the hole expansion performance is very low; single-phase structure such as bainite single-phase steel, although the hole expansion rate is high, but low elongation

Method used

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  • Hot-rolled pickled steel strip with high broaching performance and production method thereof
  • Hot-rolled pickled steel strip with high broaching performance and production method thereof
  • Hot-rolled pickled steel strip with high broaching performance and production method thereof

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Embodiment Construction

[0024] The embodiments of the present invention provide a hot-rolled pickled steel strip with high hole-expanding performance and its production method, which can ensure that the hot-rolled pickled steel with a tensile strength of 980 MPa has a high hole-expanding rate and elongation; the heat obtained The tensile strength of the rolled and pickled strip steel is ≥980MPa, the hole expansion ratio λ≥110%, and the elongation rate ≥20%, with excellent strip surface quality.

[0025] In order to achieve the above object, the present invention provides a hot-rolled pickled steel strip with high hole expansion performance, the mass percentage of its chemical composition is: C: 0.03% ~ 0.1%, Si: ≤ 0.1%, Mn: 0.5% ~ 1.5%, P≤0.02%, S≤0.006%, Nb≤0.05%, Ti≤0.1%, Mo≤0.15%, Re: 0.1%~0.4%, the rest is Fe and unavoidable impurities;

[0026] The internal microstructure of the hot-rolled pickled steel strip is ferrite.

[0027] The structure type of the steel strip obtained in the embodiment ...

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Abstract

The invention discloses a hot-rolled pickled steel strip with high broaching performance and a production method thereof, and belongs to the technical field of steelmaking. The hot-rolled pickled steel strip comprises the following chemical components by mass percent: 0.03% to 0.1% of C, 0.1% or fewer of Si, 0.5% to 1.5% of Mn, 0.02% or fewer of P, 0.006% of fewer of S, 0.05% or fewer of Nb, 0.1% or fewer of Ti, 0.15% or fewer of Mo and 0.1% to 0.4% of Re, and the balance being Fe and unavoidable impurities. An internal microscopic structure of the hot-rolled pickled steel strip is ferrite. The production method comprises the steps of molten iron pretreatment, smelting, casting, hot rolling, cooling, reeling, levelling and pickling, a three-stage cooling mode of water cooling, air cooling and water cooling is adopted, and constant-speed rolling is controlled. According to the obtained hot-rolled pickled steel strip, the tensile strength is larger than or equal to 980 MPa, the broaching rate lambda is larger than or equal to 110%, the elongation is larger than or equal to 20%, and the surface quality of the steel strip is excellent.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a hot-rolled pickled steel strip with high hole expansion performance and a production method thereof. Background technique [0002] As a steel grade in advanced high strength steel (AHSS), hot-rolled pickled high hole expansion steel, compared with traditional low alloy high strength, ferritic martensitic dual phase steel, is characterized by its high strength and high hole expansion performance. , Has been widely used in the manufacture of automobile spokes, chassis, various frames of the car body and other structural parts. [0003] With the development of lightweight automobiles, parts such as automobile spokes, control arms, and car bodies have extremely high requirements for product strength and hole expansion rate, and the demand for 980MPa grade products will gradually increase. Although traditional ferrite + martensite (F+M) has high ductility, the hole expansion pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C38/14C21D8/02
CPCC21D8/0226C21D2211/005C22C38/005C22C38/02C22C38/04C22C38/12C22C38/14
Inventor 郭子峰郭佳张冯军陈斌周娜李玉鹏吕宝峰吴科敏王学强宋春华李景庆陈波
Owner SHOUGANG CORPORATION
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