strength and impact toughness of linepipe steel X80-0.04C
1.87Mn
0.27Mo
0.06Nb
0.006V
0.017Ti were tested and compared with linepipe steel X70.The exarination results showed that as structure of the linepipe steel X80 was acicular ferrite + fine dispersed bainite
the steel had better stength and toughness
its tensile strength was up to 750 MPa and ratio of tensile strength to yield strength was nearly up to 0.85