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Carbon steel: ASTM/ASME A234 WPB WPC. Alloy steel: ASTM/ASME A234 WP 1-WP 12-WP 11-WP 22-WP 5-WP 91-WP 911. Stainless steel: ASTM/ASME A403 WP 304-304L-304H-304LN-304N.