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Ferrite-martensite non-quenched and tempered steel, high-strength bolt and preparation method thereof

A technology of non-quenched and tempered steel and high-strength bolts, applied in the direction of manufacturing tools, heat treatment equipment, furnace types, etc., can solve the problem that it is difficult to reduce the permanent elongation of non-quenched and tempered steel, so as to improve stability and reduce permanent elongation Effect

Active Publication Date: 2020-05-01
SHOUGANG CORPORATION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the deficiencies of the above-mentioned prior art, the present invention provides a ferritic-martensitic non-quenched and tempered steel, high-strength bolts and a preparation method thereof to solve the problem that it is difficult to reduce the permanent elongation of non-quenched and tempered steel in the prior art technical issues

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  • Ferrite-martensite non-quenched and tempered steel, high-strength bolt and preparation method thereof
  • Ferrite-martensite non-quenched and tempered steel, high-strength bolt and preparation method thereof
  • Ferrite-martensite non-quenched and tempered steel, high-strength bolt and preparation method thereof

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[0022] The present invention will be described in detail below in conjunction with specific embodiments and examples, and the advantages and various effects of the present invention will be presented more clearly. Those skilled in the art should understand that these specific implementations and examples are used to illustrate the present invention, not to limit the present invention.

[0023] Throughout the specification, unless otherwise specified, terms used herein should be understood as commonly used in the art. Therefore, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, this specification shall take precedence.

[0024] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0025] An e...

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Abstract

The invention discloses ferrite-martensite non-quenched and tempered steel, a high-strength bolt and a preparation method thereof. The number percentage gamma 1 of martensite-austenite components in the ferrite-martensite non-quenched and tempered steel is 85% -95%, and the volume percentage gamma 2 of martensite-austenite components in the ferrite-martensite non-quenched and tempered steel is 15%-25%. The martensite-austenite components can be distributed in a ferrite matrix in a dispersed manner, the stability of the ferrite-martensite non-quenched and tempered steel is improved, and the permanent elongation of the ferrite-martensite non-quenched and tempered steel is reduced.

Description

technical field [0001] The invention relates to a ferrite-martensitic non-quenched and tempered steel, a high-strength bolt and a preparation method thereof, belonging to the technical field of controlled rolling and controlled cooling. Background technique [0002] The deep processing industry is gradually developing towards high efficiency, low cost and reduction of processing process. It is a development trend to develop new materials that adapt to the new process. Although the quenched and tempered steel produced after the conditioning treatment has high strength, plasticity and toughness, the non-quenched and tempered steel can save the two long-term and energy-intensive processes of quenching and high-temperature tempering in the quenching and tempering treatment, simplifying At the same time of the process, problems such as surface oxidation, decarburization and workpiece deformation caused by heat treatment are avoided. Therefore, non-quenched and tempered steel has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D9/00
CPCC21D1/18C21D9/0093C21D2211/001C21D2211/008
Inventor 罗志俊李舒笳孙齐松王晓晨徐士新马跃吕迺冰周洁佟倩
Owner SHOUGANG CORPORATION
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