... oxide, electro galvanized, hot dip galvanized, black painted etc.3) Material: 20Mn2, 25Mnv, Q235 (alloy steel chains, mild steel chains, ... the purchase order 2. Product requirement 3.Buy raw material 4. Inspect raw material 5. Store raw material6. Wire rod drawing 7 ... .productShow(); oProductShow.init( { 'aImgSrc': aBigImageSrc } ); } )(); Grade 80 Alloy Steel Chains With Zinc Plated/Black Oxide