... : ASTM A403 WP304, 304L, 310, 316, 316L, 321, 347, 904L Carbon Steel: ASTM A234 WPB, WPC ASTM A105 WPHY 42, 46 ... advanced paymentCertificateAPI, CCS,and ISO9001:2000Productivity30000 ton per yearKeywords: ELBOW,carbon steel seamless pipe fittings,steel seamless pipe fitting Pipe Elbow