2008•Welded Pipe and TubeRequires access

Study on Strain Aging Hardening of Large Distortion Steel

Bai Fan

Abstract

The mechanical properties(strain-aging)of the high strength linepipe steel(grade X80 and above)is different between before and after heating at a certain temperature,and temperature holding time.Unexceptional Yield strength and Y/T ration is increased,yield elongation occurred,and the shape of stress-strain curve changes after heating.Such variations of properties will make bad effect to deformability of steel pipes.In this paper,heating temperature and holding time which have effected on properties are determined by the test and study of the steel pipes with the large deformation X80 1219×22mm(pipes were supplied by JFE),and the influence rules of the strain-aging to the material properties is also obtained,which provides reference for such application in the second West-East Gas pipeline.

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Key concepts: Dynamic strain aging, Materials science, Strain hardening exponent, Elongation, Hardening (computing), Metallurgy, Strain (injury), Yield (engineering)