Material: Carbon steel(ASTM A234WPB,,A234WPC,A420WPL6. 20#,Q235,10#,20#,A3, Q235A, 20G,16Mn, ect) Stainless steel(ASTM A403 WP304,304L,316,316L,321. 1Cr18Ni9Ti, 00Cr19Ni10,00Cr17Ni14Mo2, ect) Alloy steel(ASTM A234 WP12,WP11,WP22,WP5,WP9,WP91,16MnR, Cr5Mo, 12Cr1MoV, 10CrMo910,15CrMo, 12Cr2Mo1, ect) Technique: seamless,butt welding Standard:ANSI B16.9, ANSI B16.28, JIS B2311, DIN 2605, 2615, 2616, and 2617,EN10253 Head code: bevel the end Size:1/8” to 48” Radius:30°,45°,60°,90°,180° or as requirement Radius Of Curvature: 1D-10D