What is the difference of material WP5,WP9,WP11,WP22
First of all,WP5,WP9,WP11,WP22 are steel grades from standard ASTM A234,SPECIFICATION FOR PIPING FITTINGS OF WROUGHT CARBON STEEL AND ALLOY STEEL FOR MODERATE AND HIGHTEMPERATURE SERVICE,alloy pipe fittings of ASTM A234 WP1/ WP5 / WP9 / WP11,WP22 etc.(ASTM A234 WP5 Pipe Fitting)ASTM A234,carbon steel material commonly used in WPB and WPC,alloy materials commonly used WP5/WP9/ WP11