Hot rolled spoke steel with yield ratio of 0.45-0.49 and tensile strength of 630-670 MPa and manufacturing method thereof

A technology with a tensile strength of 670mpa, applied in the field of steel rolling, can solve problems such as poor stamping performance and large springback

Inactive Publication Date: 2014-03-12
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above two materials both produce large springback during the stamping process of manufacturing wheel spokes with complex cross-sections, that is, the stamping performance is poor.

Method used

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  • Hot rolled spoke steel with yield ratio of 0.45-0.49 and tensile strength of 630-670 MPa and manufacturing method thereof
  • Hot rolled spoke steel with yield ratio of 0.45-0.49 and tensile strength of 630-670 MPa and manufacturing method thereof
  • Hot rolled spoke steel with yield ratio of 0.45-0.49 and tensile strength of 630-670 MPa and manufacturing method thereof

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Embodiment Construction

[0012] The present invention is described in detail below in conjunction with specific examples, but the present invention is not limited to the following examples.

[0013] The steel with the chemical composition in Table 1 is selected as the raw material, rolled at a constant speed by the hot continuous rolling mill, the final rolling temperature is controlled, and sectioned cooling is carried out after rolling. The thickness of the steel strip is limited within the range of 2.5-4.0mm. The process parameters are shown in Table 2, and the structure and mechanical properties are shown in Table 3.

[0014] Table 1 embodiment measured chemical composition

[0015] Ingredient number

C

mn

Si

S0

0.050

1.50

0.20

S1

0.060

1.45

0.30

S2

0.065

1.30

0.10

S3

0.070

1.20

0.30

[0016] Table 2 embodiment measured process parameters

[0017]

[0018]

[0019] The measured mechanical...

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Abstract

The invention discloses a hot rolled spoke steel with the yield ratio of 0.45-0.49 and tensile strength of 630-670 MPa and a manufacturing method thereof, and belongs to the technical field of steel rolling. A sectional type cooling process conducted after hot rolling is adopted, the sizes and volume fractions of ferrite and a martensite island are accurately controlled, and a hot rolled dual-phase steel belt with the yield ratio of 0.45-0.49 and tensile strength of 630-670 MPa is provided. The thickness of the steel belt is 2.5-4.0 mm, the percentage elongation of the steel belt is 26-29%, and the steel belt is applicable to the manufacturing of a stamped spoke.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and relates to the manufacture of high-strength steel for automobile wheel spokes, in particular to a hot-rolled steel strip with a yield ratio of 0.45-0.49 and a tensile strength of 630-670 MPa and a manufacturing method. Background technique [0002] The development of low-cost, high-strength steel for automotive structures has always been a hot spot in the research of steel materials at home and abroad. In the past 10 years, the low-cost, C-Mn composition 500MPa grade hot-rolled "ultra-fine grain" ferritic steel strip has been developed by using the fine-grain strengthening mechanism. Using the martensitic transformation strengthening mechanism, a 590MPa hot-rolled ferrite-martensitic dual-phase steel strip was developed. However, the above-mentioned two kinds of materials both produce relatively large springback during the stamping process of manufacturing wheel spokes with complex cro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C21D8/02
Inventor 刘彦春钱爱文
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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