Characterization of the welded-joint of High-strength High-toughness Seamless Steel Pipe under high-cycle fatigue condition

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Important Dates

Conference:

Apr. 22-24, 2019

Full Paper Due: Mar. 18, 2019

Abstract Due: Mar. 18, 2019

Audience Registration Due:
Apr. 22, 2019

Presentations of The Spring World Congress on Engineering and Technology (SCET 2017)

● Characterization of the welded-joint of High-strength High-toughness Seamless Steel Pipe under high-cycle fatigue condition
Author(s)
Qingchao Tian
Affiliation(s)
Shanghai University
KEYWORDS
welded-joint, High-strength High-toughness, Seamless Steel Pipe, high-cycle fatigue condition
ABSTRACT
The welded joint of a S890QL grade steel pipe containing 1.2% Ni has been prepared to characterize the use performance under high cycle fatigue test. It has been found that the fatigue strength of the welded joint is 290MPa with a fatigue life of more than 10 million cycles, and the obtained Basquin equation is . It is found that the steel obtains the whole bainite microstructure when the cooling rate is less than 1℃/s. The weld area of the welded joint is divided into five zones, i.e., the weld zone, the coarse grain zone, the fine grain zone and the softening zone.The fine grain characteristic in the weld area determines the good anti fatigue performance of the investigated steel.