Specimens
Yield strength Rt0.5(MPa) Tensile strength Rm(MPa) Elongation A50mm(%) Yield ratio Rt0.5/Rm
Impact absorbed energy at -10 ℃ (J)
X90 Parent pipe 748 847 17.5 0.90 204
Straight part 710 821 20 0.86 223
Inner arc side 706 802 24 0.88 225
Outer arc side 750 848 21 0.88 153
The neutral axis 693 785 22 0.88 220