Alloy structural steel (GB 3077-88) (3)
1. Introduction
Alloy structural steel ( GB 3077-88) is a kind of alloy structural steel formulated by the State Economic and Trade Commission. The standard includes the following grades of alloy structural steel: 15Cr, 20Cr, 30CrMnSiA, 35CrMnSiA, 20CrMnMo, 20CrMo, 30CrMo, 25CrMoV, 14CrMo, 20CrV,......