ASTM A234/A234M-10 STANDARD SPECIFICATION FOR PIPING FITTINGS OF WROUGHT CARBON STEEL AND ALLOY STEEL FOR MODERATE AND HIGH TEMPERATURE SERVICE. HARDNESS 1.FITTINGS OF GRADES WP5,WP9,AND WPR-217 HB MAXIMUM. 2.FITTINGS OF GRADES WP91 AND WP911-248 HB MAXIMUM. 3.FITTINGS OF ALL OTHER GRADES-197 HB MAXIMUM.
