Astm A479 Duplex Karfe Unpols unpers da kyau sannu da sannu da sannu da yawa, arc welding da baka na baka da kuma jirgin ruwa na lardgue da gas. Asme sa 479 duplex uns unther unther sа1803 square Waller ne ferritic, ustenitic 22% Chromium, kashi biyu, kashi 3%, 3% na molyy karfe.