aisi 4130 forged steel 1.grade:,4130,4140 crmo alloy 2.Tolerance :- 0.01+0.01 3Tech: ... , combined with heat treatment / drill steel / hexagon pipe4130 steel tube / aisi 4130 / chrome steel tube4140 Meets ASTM A519 /A513Stocked Size Range: 0 ... , Chinese GB, JIS, DIN, ASTM, which are widely applied in the manufacture of vehicle, bridge, highway armrests, chemical machines, petroleum, food, energy ...