... ,STD,XS,XXS, 3.material : ASTM A234 WPB , DIN , JIS, EN10253,GOST 4. the most co pipe fitting elbow 45D(LR, SR ... ), 90D(SR, LR), 180DMaterial: carbon steel, alloy steelStandard: ANSI, JIS, DIN GB ... , foodstuff, power, papermaking, chemical, medical equipment, aviation, water supply pipe steel elbow