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weldable made from pipe (WP), with equivalent grade B;
weldable made from casting (WC), with equivalent grade B;
weldable made from pipe, low temperature service, with 60ksi strength (WPL6)
This Grade is associated with ASTM A420 for pipe fittings manufactured of Wrought Carbon Steel. WPL6 is a normalized grade of carbon steel that has been Charpy Impact tested at -50 degree F for use in low temperature service. See Also ASTM A333 Grades 1 and 6 (for pipe) and A350 LF2 for flanges.