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,......