Tensile strength 700 MPa-grade high broaching hot-rolled steel plate and manufacturing method thereof

A technology of high tensile strength and hot-rolled steel plate, which is applied in the field of high-expansion hot-rolled steel plate with a tensile strength of 700MPa and its manufacturing field. Pore ​​performance, reduction of strength difference effect

Active Publication Date: 2017-05-03
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a 700MPa high tensile strength hot-rolled steel plate and its manufacturing method, to solve the existing technical problems of poor reaming and flanging processing performance of the 700MPa high tensile strength hot-rolled steel plate

Method used

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  • Tensile strength 700 MPa-grade high broaching hot-rolled steel plate and manufacturing method thereof
  • Tensile strength 700 MPa-grade high broaching hot-rolled steel plate and manufacturing method thereof
  • Tensile strength 700 MPa-grade high broaching hot-rolled steel plate and manufacturing method thereof

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Embodiment Construction

[0044] The present invention will be further described below in conjunction with Examples 1-4.

[0045] Table 1 shows the chemical composition (by weight percentage) aa of the steel of the embodiment of the present invention, and the balance is Fe and unavoidable impurities.

[0046] Table 1 The chemical composition of the steel of the embodiment of the present invention, unit: weight percent

[0047]

[0048] According to the requirements of the material composition design of the present invention, pre-desulfurization of molten iron is adopted, combined top-bottom blowing of converter, Ar blowing station (or LF furnace) ensures bottom blowing Ar stirring time is more than 5 minutes, and RH furnace performs composition fine-tuning and vacuum cycle degassing treatment , to ensure that the RH pure degassing time is greater than 15 minutes, and at the same time feed an appropriate amount of iron-calcium wire, blow Ar protection casting throughout the process, and cast it into ...

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Abstract

The invention relates to a tensile strength 700 MPa-grade high broaching hot-rolled steel plate and a manufacturing method thereof, and solves the technical problems of weak broaching and flanging performance of a traditional tensile strength 700 MPa-grade high broaching hot-rolled steel plate. The tensile strength 700 MPa-grade high broaching hot-rolled steel plate comprises the following chemical components in percentage by weight: 0.05-0.09% of C, 0.15-0.35% of Si, 1.20-1.80% of Mn, P not more than 0.015%, S not more than 0.008%, 0.015-0.050% of Al, 0.08-0.13% of Ti, 0.035-0.065% of V, and the balance of iron and inevitable impurities. The hot-rolled steel plate can be used for manufacturing vehicle structural parts.

Description

technical field [0001] The invention relates to a high-hole expansion steel plate, in particular to a high-hole expansion hot-rolled steel plate with a tensile strength of 700 MPa and a manufacturing method thereof. Background technique [0002] With the development of the automobile industry, the automobile industry has higher and higher requirements for lightweight, safety, cost reduction, and fuel consumption reduction. "High-strength thinning" is an inevitable trend of automotive steel. Many body parts, such as automotive power swing arms, wheels, etc., put forward higher requirements for the strength of steel. However, in the application process, it was found that this high-strength material is very prone to cracking when making certain parts with large hole expansion and flanging, so these parts require good steel properties under the premise of high strength. Excellent hole expansion performance, good extension flange. [0003] In the prior art, the production of hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C21D8/02
Inventor 裴新华
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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