... , Canada, Colombia, Italy, South Africa, United State etc 1) Grade: G80, G70, G60, G43, G30 alloy steel chains2) Surface ... treatment: Self color, black oxide, electro galvanized, hot dip galvanized, black painted etc.3) Material ... NACM, ASTM), European Standard (EN818), AS/NZS StandardWorking procedures of Grade 80 Alloy Steel Chains:1. Receive the purchase order 2 ...