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small radius of curvature from 1.5­2.0 diameter ratio (DR) have been investigated. Our pipe material was low carbon steel (SA106Gr-B) having the chemical compositions of 0.3C, 0.29Mn, 0.4Cr, and 0.4Cu (mass%). The high cycle fatigue, microstructure, hardness, and residual stress of two bent sections ®extrados and intrados regions ®were compared with those of the raw material section. Low carbon steel pipes have better fatigue characteristics at the bent section than at the raw material section. The improvements in the fatigue strength of specimen resulted from grain refinement and phase transformation, while compressive residual stress at surface of bent pipe remained by thermo-mechanical processing can give better fatigue properties in fields. [doi:10.2320/matertrans.MF201123]

Mechanical Characteristics of Low-Carbon-Steel Pipe Bent by Local Induction Heating with Small Bending Radii