ASTM/ANSI St37 Carbon Steel ElbowsCarbon steel:ASTM/ASME A234 WPB-WPC, ST37,Alloy steel:ST52,12CrMo, 15CrMo,WP 1-WP 12 ,WP 11-WP 22 ,WP 5-WP 91-WP 911Contact Us:datangfintube@gmail.com ASTM A234 Wpb Carbon Steel TeeSize: seamless size: 1/2″~28″DN15~DN700welding size: 4″~78″ DN150~DN1900Contact Us:datangfintube@gmail.com ASTM A182 Welding Neck FlangeForged FlangeStandard: ANSI B16.5, ANSI B16.47 SERIES A & B, DIN2573, 2572, 2631, 2576, 2632, 2633, 2543, 2634, 2545Contact Us:datangfintube@gmail.com