Hot rolled steel for rims, with tensile strength of 560-590MPa and preparation method thereof

A technology of tensile strength and rim, which is applied in the field of steel rolling, can solve the problems of elongation reduction and achieve the effect of increasing elongation

Active Publication Date: 2014-04-02
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The main reason for limiting the use of higher strength grades of steel is that the increase in tensile strength of the steel is usually accompanied by a significant decrease in elongation, and when the elongation drops below 30%, the cracking rate and scrap rate during the manufacturing process of the rim are significant. When the cracking rate and scrap rate are high, the increase in manufacturing cost will offset or even exceed the economic benefits brought by material thinning

Method used

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  • Hot rolled steel for rims, with tensile strength of 560-590MPa and preparation method thereof
  • Hot rolled steel for rims, with tensile strength of 560-590MPa and preparation method thereof
  • Hot rolled steel for rims, with tensile strength of 560-590MPa and preparation method thereof

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Embodiment Construction

[0011] The present invention is described in detail below in conjunction with specific examples, but the present invention is not limited to the following examples.

[0012] 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 segmental cooling is carried out after rolling. The thickness of the steel strip is limited within the range of 6.0-7.0mm. The process parameters are shown in Table 2, and the structure and mechanical properties are shown in Table 3.

[0013] Table 1 embodiment measured chemical composition

[0014] Ingredient number

C

mn

Si

S0

0.050

1.47

0.25

S1

0.060

1.50

0.30

S2

0.065

1.35

0.10

S3

0.070

1.20

0.30

[0015] Table 2 embodiment measured process parameters

[0016]

[0017] The measured mechanical properties ...

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Abstract

The invention discloses hot rolled steel for rims, with tensile strength of 560-590MPa and a preparation method thereof, belonging to the technical field of rolled steel. The hot rolled steel and the preparation method have the technical effects that a process of subsection cooling after hot rolling is adopted, the sizes and volume fractions of ferrite, bainite and martensite in the structure are accurately controlled, the tensile strength of the steel is improved via bainite and martensite phases in the structure and the residual stress of a steel strip is reduced and the elongation of the steel is improved by controlling the sizes and volume fractions of ferrite grains and adopting multistage air cooling; the hot rolled steel for rims has tensile strength of 560-590MPa, elongation (A5) of 34-36% and thickness specification of 6.0-7.0mm and is suitable for manufacturing rims of heavy duty automobiles.

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 rims, in particular to a steel for hot-rolled rims with a tensile strength of 560-590 MPa and a manufacturing method. Background technique [0002] With the increasing requirements for the lightweight manufacturing of automobiles, the restrictions on the weight of the wheels are becoming more and more stringent. On the premise of not reducing the load-carrying capacity and fatigue performance of the wheel, using higher strength and thinner steel to manufacture the wheel can not only reduce the weight of the wheel, but also obtain the economic benefits of saving materials. Therefore, the design and manufacture of lightweight wheels has become a hot topic of concern for many automotive OEMs (OEMs) and wheel manufacturers. Commonly used heavy-duty vehicle wheel rim steel grades are 330CL, 380CL and 420CL, and the number...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/60C21D8/02
Inventor 刘彦春钱爱文
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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