ASME B16.9
24" to 48” N.B.  SCH20 to SCH XS thickness
Carbon steel:
ASTM/ASME SA234 WPB, WPC,
Alloy steel:
ASTM/ASME SA234 WP5, WP9, WP11, WP12, WP22, WP91
Temperture Steel:
ASTM/ASME A420 WPL6 WPHY P42, P46, P52, P56, P60, P65, P70