We are offering head plug material type: stainless steel, alloy steel and carbon steel nickel alloy astm asme sb 336 uns 2200 ( nickel 200 ), uns 2201 (nickel 201 ), uns 4400 (monel 400 ), uns 8020 ( alloy 20 20 cb 3, uns 8825 inconel (825), uns 6600 (inconel 600 ), uns 6601 ( inconel 601 ), uns 6625 (inconel 625), uns 10276 ( hastelloy c 276 ) stainless steel astm asme sa 403 gr wp "s" "w" " wx" 304 , 304l, 304h, 304n, 304ln, 309, 310h, 316, 316h, 317, 317l, 321, 321h, 347, 347 h. duplex steel astm asme sa 815 uns no.s 31803, s 32205, s 32550, s 32750, s 32760. carbon steel astm asme a 234 wpb, wpcastm asme a 860 wphy 42, wphy 46, wphy 52, wph 60, wphy 65 & wphy 70. alloy steel astm asme a 234 wp 1, wp 5, wp 9, wp 11, wp 12, wp 22, wp 23, wp 91.