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Alloy Steel Pipe Fittings ASTM 234 WP5 / WP9 / WP11 / WP12 / WP22 Alloy steel butt weld pipe fittings have many grades which are ASTM A234 WP5 CL1 / CL3, WP9 CL1 / CL3, WP11 CL1 / CL2 / CL3. WP12 CL1 ...