Forged super steel-Quenched Tempered。 25%stronger than G80。 Individually proof test at 2.5 times Working Load Limit。 Fatiuge tested at 1.5 times Working Load Limit for20000 cycles。 Breakage twst。 magnaflux crack getecion。 Solour code:Powder plastified。 Ultimate load is 4 times the Working Load Limit。