... carbon steel, alloy steel, stainless steel. ASTM A234 WPB/WPHY42/50/60/70 ETC5)coating: anti-rust black painting, 3PE coating or galvanized.6)packing ... weld , threaded, lap joint, blind, spectacle, orifice, ring and long welding neck flanges.SIZE: 1/2 inch-48 ... WP11, WP15, WP22, WP1, WP5, WP9, WP91USE:Petroleum, chemical, power, gas, metallurgy, shipbuilding, construction, etc.Special design ...