ASTM A312 Tp321 na bakin karfe mai ƙarfin ƙarfe ne. An ƙera bututun walda na SS 321 wanda aka samar a ƙarƙashin ƙayyadaddun ASTM A312 don tsayayya da tsatsa tsakanin granular, musamman a yanayin zafi mai yawa. A zafin jiki tsakanin 800 zuwa 1500°F, ƙarfin bakin karfe mai ƙarfi da aka saba amfani da shi a yau da kullun yana da sauƙin kamuwa da ruwan sama na chromium carbide, sabanin ASTM A312 Gr.Tp321 wanda ke da ƙarfin rarrafe da kuma ƙarfin fashewa. Bugu da ƙari, bututun ƙarfe mai ƙarfi na 321 yana da kyawawan halaye na tauri ko da a ƙananan yanayin zafi.
Darajan Tube:TP321, AISI 321, EN 1.4541, UNS S32100
Nau'in Bututu:Ba shi da sumul
Tsarin Bututu:Madaidaiciya, Lanƙwasa U, Guda-zuwa-Tsawon Yanka
Ƙarshen Fuskar:Maganin da aka yi wa ado da kuma aka yi wa ado (AP), Mai haske (BA), Mai gogewa