.英制(SAE J429)螺栓所用材料:Grade12455.15.2788.18.2Material and TreatmentLow or medium carbon steelMediumCarbon cold drawn steelMedium Carbon steel quenched and temperedLow or medium carbon steelMedium Carbon alloy steel quenched and temperedSAE1541Low or medium carbon steelElement%CMin-0.280.150.150.280.280.280.15Max0.550.550.550.550.300.250.550.550.550.25Mn Min-0.74-