A kind of manufacturing method of high-strength steel, steel pipe and steel pipe by phase transformation strengthening cold working

A technology of phase transformation strengthening and high strength steel, which is applied in the field of phase transformation strengthening cold working high strength steel, the manufacture of steel pipes and steel pipes, and the fields of cold drawn/cold rolled high strength steel. Low cost, avoid cracking, excellent damping effect
CN106048412BActive Publication Date: 2018-04-27BAOSHAN IRON & STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Patents(China)
Current Assignee / Owner
BAOSHAN IRON & STEEL CO LTD
Publication Date
2018-04-27

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Abstract

The invention provides a transformation strengthened cold-machined high-strength steel, a steel tube and a manufacturing method thereof. The steel comprises the following chemical components in percentages by weight: 0.11-0.17% of C, 0.1-0.5% of Si, 0.5-2.0% of Mn, 0.01-0.05% of Al, 0.001-0.01% of Ca, less than or equal to 0.015% of P, less than or equal to 0.003% of O, less than or equal to 0.005% of S, less than or equal to 0.004% of N, and the balance of Fe and inevitable impurities, and meanwhile, the following relationship is required to be satisfied: 0.3%<C*Mn+Cr+2Mo<1.1%. The cold-machined high-strength steel tube is prepared by a transformation strengthened and strain strengthened composite process, the yield strength of the steel tube reaches 890 MPa or above, the elongation is greater than or equal to 10%, the structure of the steel tube is deformation ferrite and tempered martensite, and damping performance is excellent.
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Description

technical field

[0001] The present invention relates to high-strength steel pipes, in particular to a phase-transition-strengthened cold-worked high-strength steel, a steel pipe and a method for manufacturing a steel pipe, in particular to cold-drawn / cold-rolled high-strength steel with a yield strength of 890 MPa or more produced by a phase-change strengthening process, A steel pipe and a method for manufacturing the steel pipe. Background technique

[0002] It is an inevitable trend of social development that construction machinery and steel structures are developing in the direction of large load-bearing and lightweight. Especially for steel structural parts that bear high loads, increasing the strength grade of materials can not only reduce the self-weight of the structure, reduce material costs, but also help improve the bearing capacity of steel structural parts. Therefore, how to increase the strength of steel at low cost and efficiently has always been the goal purs...

Claims

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