... : Self color, black oxide, electro galvanized, hot dip galvanized, black painted etc.3) Material: 20Mn2, 25Mnv,10B21, 23MnNiCrMo54,Q235,Q1954) Standard: National Standard ... (GB/T20947-2007), International Standard (ISO3077-2001), American Standard (NACM, ASTM), European Standard (EN818), AS/NZS Standard,Germany standard (DIN 763/DIN764 ...