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ASTM A234 WPB Widely Used Flange Elbow Carbon Steel Seamless Pipes And Tubes Product Information 1.CARBON STEEL:ASTM/ASME A234 WPB,WPC 2.ALLOY STEEL:ASTM/ASME A234 WP 1-WP 12-WP 11-WP 22-WP 5-WP 91...