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High-strength structural steel material having excellent fatigue crack propagation inhibitory characteristics and manufacturing method therefor

A technology of fatigue crack propagation and manufacturing method, applied in the field of structural steel and its manufacturing, can solve problems such as inability to achieve accurate temperature, and achieve the effects of suppressing fatigue crack growth, improving fatigue resistance, and ensuring fatigue crack growth.

Active Publication Date: 2020-08-14
浦项股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, Patent Document 2 cannot be applied to high-strength steels above 700 MPa because it is mainly composed of elongated ferrite. In order to refine the structure, the surface layer must be rolled during the process of heating by heat exchange. Therefore, There are technical difficulties in the rolling process that cannot achieve accurate temperature

Method used

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  • High-strength structural steel material having excellent fatigue crack propagation inhibitory characteristics and manufacturing method therefor
  • High-strength structural steel material having excellent fatigue crack propagation inhibitory characteristics and manufacturing method therefor
  • High-strength structural steel material having excellent fatigue crack propagation inhibitory characteristics and manufacturing method therefor

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Embodiment Construction

[0103] The present invention will be described in more detail below by way of examples. However, it should be noted that the examples described below are merely examples for embodying the present invention, and are not intended to limit the scope of rights of the present invention.

[0104] Slabs having the composition of Table 1 below were produced, and Table 2 is the calculation result of the phase transition temperature of each slab.

[0105] 【Table 1】

[0106]

[0107] 【Table 2】

[0108]

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Abstract

A high-strength structural steel material having excellent fatigue crack propagation inhibitory characteristics according to an aspect of the present invention contains, by weight, 0.02-0.12% of C, 1.7-2.5% of Mn, 0.01-0.8% of Si, 0.005-0.5% of Al, and the balance Fe and unavoidable impurities, wherein a microstructure of the structural steel material is divided into a surface layer portion outside and a central portion inside along a thickness direction; the surface layer portion may comprise tempered bainite as a matrix structure, fresh martensite as a second structure, and austenite as a residual structure; and the central portion may comprise lath bainite.

Description

technical field [0001] The present invention relates to structural steel materials used for structures such as buildings and bridges, and a manufacturing method thereof. Specifically, it relates to a method for effectively ensuring fatigue crack growth suppression characteristics and high High-strength structural steel and its manufacturing method. Background technique [0002] Structural steel materials used in structures such as buildings and bridges are repeatedly stressed based on the characteristics of the environment in which they are used. In order to ensure the overall stability of the structure, it is very important to ensure the fatigue resistance of the material. In particular, recently, with the increase in the size of structures, there has been a tendency to reduce the weight of structures and to ensure rigidity, and therefore the use of high-strength materials has increased in reality. However, as the strength of the material increases, the stress concentrated...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C38/12C22C38/38C22C38/58C22C38/00C21D8/00
CPCC21D8/00C22C38/00C22C38/02C22C38/04C22C38/06C22C38/12C22C38/38C22C38/58C21D8/0226C21D8/0263C21D9/46Y02P10/20C22C38/002C21D8/005C21D2211/001C21D2211/002C21D2211/008C21D8/0205C22C38/001C22C38/08C22C38/14C22C38/16C22C38/32
Inventor 李一彻曹财荣姜相德
Owner 浦项股份有限公司
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