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ASTM A234 WPB WPL9 Butt Weld Fittings Elbow , Stub end , Pipe End Cap ASTM A420/A420M-00 Grade Composition, % C Mn P S Si Ni Cu Cr Mo V Nb WPL6(1)(2) 0.30 0.60-1.35 0.035 0.040 0.15-0.30 0.40 0.40 ...