Detailed Product Description The perform to standard : ASTM A53, ASTM A106, ASTM A179,ASTM A192, ASTM A513,ASTM A519, DIN 2391(EN10305-1), DIN 2393(EN10305-2), DIN1629, DIN17175 etc.The steel grade : ST35, ST35.8, ST37, ST37-2, ST44, ST44-2, ST45, ST45.8, ST52, ST52-3. etc.The specification range : OD16mm-OD159mm and WT1.2mm-WT18mm. Product condition: BK, BKS, BKW.