Wire rod having superior hydrogen delayed fracture resistance, method for manufacturing same, high strength bolt using same and method for manufacturing bolt

a technology of hydrogen delayed fracture and wire rod, which is applied in the field of wire rod, can solve the problems of deterioration of hydrogen delayed fracture resistance, insufficient use of wire rod for manufacturing ultrahigh strength bolts, and insufficient strength of wire rod as a raw material, so as to achieve superior hydrogen delayed fracture resistance and high strength. , the effect of high strength
US20140150934A1Inactive Publication Date: 2014-06-05POHANG IRON & STEEL CO LTD
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
POHANG IRON & STEEL CO LTD
Publication Date
2014-06-05
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention relates to a wire rod used in bolts for automobile engines, for example, and more specifically to a wire rod having an improved resistance to hydrogen delayed fracture, to a manufacturing method for same, to a bolt using same and a method for manufacturing the bolt. Provided are a high strength wire rod having a superior resistance to hydrogen delayed fracture and a method for manufacturing same, a high strength bolt using the wire rod and a method for manufacturing same, wherein.the wire rod comprises, 0.3-0.7 wt % C, 0.05-2.0 wt % Si, 0.7-1.5 wt % Mn, 0.01-0.1 wt % Ni, and 30-70 ppm La, and the remainder thereof is comprised by Fe and inevitable impurities.
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Description

TECHNICAL FIELD

[0001] The present disclosure relates to a wire rod used for automobile engine bolts and the like, and more particularly, to a wire rod having improved hydrogen delayed fracture resistance, a method for manufacturing the same, a high strength bolt using the same, and a method for manufacturing the bolt.BACKGROUND ART

[0002] in accordance with the recent trend for weight reductions and high functionalization in automobiles, requirements for driving parts, in particular, engine parts such as bolts and the like, to have high strength, have increased in order to reduce energy consumption. Currently used high strength bolts are manufactured to have a tensile strength of 1200 MPa through quenching and tempering processes, using alloyed steels such as SCM435, SCM440, and the like. However, in the bolts having a tensile strength of 1200 MPa or greater, since delayed fractures may be easily caused due to hydrogen, the uses of wire rods for manufacturing ultrahigh strength bolts ...

Claims

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