Environmental Fracture Sensitivity of Low Alloy High-strength Bainitic Steels Containing Silicon

To investigate the environmental adaptability of two bainitic steels contained silicon,the mechanical properties and environmental fracture sensitivity of the two steels with different carbon contents were tested.The results showed that the environmental fracture sensitivity of the bainitic steels was affected by the strength (the carbon content) of the steels obviously.The environmental fracture sensitivity of the steel with high carbon content(HC)(C 0.88%,σy=1818 MPa) was much higher than that with low carbon content(HL)(C 0.33%,σy=1310 MPa).The environmental fracture sensitivity of the HC steel was higher than that of the T250 maraging steel at the same strength level.And the environmental fracture sensitivity of the LC steel was equivalent to that of the 30CrMnSiNi2A steel at the same strength level.