Steel plate for precision welded pipe with 400MPa-grade yield strength and manufacturing method thereof

A technology of yield strength and manufacturing method, which is applied in the field of iron-based alloys to achieve stable performance, fill the gap in the industry, and reduce manufacturing costs

Inactive Publication Date: 2017-11-24
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to provide a hot-rolled steel plate for precision welded pipes with a yield strength of 400 MPa and its manufacturing method, mainly to solve the technical problems of industrial production of hot-rolled steel plates for precision welded pipes with a yield strength of 400 MPa

Method used

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  • Steel plate for precision welded pipe with 400MPa-grade yield strength and manufacturing method thereof
  • Steel plate for precision welded pipe with 400MPa-grade yield strength and manufacturing method thereof
  • Steel plate for precision welded pipe with 400MPa-grade yield strength and manufacturing method thereof

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Embodiment Construction

[0041] The present invention will be further described below in conjunction with Examples 1-4, as shown in Tables 1-3.

[0042] Table 1 is the chemical composition (by weight percentage) of the steel of the embodiment of the present invention, and the balance is Fe and unavoidable impurities.

[0043] Table 1 Chemical composition of the steel of the embodiment of the present invention, unit: weight percent.

[0044]

[0045]

[0046] According to the design requirements of the material composition of the present invention, pre-desulfurization of molten iron is adopted, top-bottom combined blowing of converter, LF blowing Ar treatment, and at the same time, an appropriate amount of calcium wire is fed for calcium treatment. , cast into continuous casting slabs.

[0047] After the continuous casting slab is heated by the heating furnace, it is rolled on the hot tandem rolling mill. taken to produce hot-rolled coils, and the thickness of the finished hot-rolled steel plat...

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Abstract

The invention relates to a steel plate for a precision welded pipe with a yield strength of 400MPa and a manufacturing method thereof, and mainly solves the technical problem of industrial production of a hot-rolled steel plate for a precision welded pipe with a yield strength of 400MPa. The hot-rolled steel plate for precision welded pipe with a yield strength of 400MPa grade provided by the present invention has the following chemical composition weight percentages: C: 0.20-0.30%, Si≤0.10%, Mn: 1.0-1.40%, P≤0.02%, S≤0.01% , N≤0.0060%, Al: 0.015-0.060%, Ti: 0.01-0.03%, and the balance is iron and unavoidable inclusions. The yield strength of the hot-rolled steel plate is 440-550MPa, the tensile strength is 550-650MPa, and the elongation A after fracture is 25-35%. The hot-rolled steel plate of the invention is suitable for making precision welded pipes for automobile structures.

Description

technical field [0001] The invention relates to a steel plate for precision welded pipes, in particular to a hot-rolled steel plate for precision welded pipes with a yield strength of 400MPa and a manufacturing method thereof, belonging to the technical field of iron-based alloys. Background technique [0002] Precision welded pipe is a fine product among welded pipe products. Compared with ordinary welded pipes, it has uniform wall thickness, good steel pipe geometry, small ellipticity, reliable weld quality, small internal burrs, and smooth outer surface. , stable mechanical properties and uniform metallographic structure, its dimensional accuracy is higher than that of seamless pipes, and its production cost is much lower than that of the same type of seamless precision steel pipes. [0003] With the development of the automobile industry, some auto parts companies propose to use hot-rolled steel plates to produce welded pipes through pickling, slitting, rolling, welding...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/14C21D8/02
CPCC22C38/02C21D8/0226C21D2211/005C21D2211/009C22C38/001C22C38/002C22C38/04C22C38/06C22C38/14
Inventor 段争涛裴新华夏小明郭园园凌爱兵
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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