301 Full Hard ndi chitsulo chosapanga dzimbiri cha austenitic chomwe chimasiyana ndi mitundu ina ya 301 yoperekedwa ndi United Performance Metals chifukwa chazizira kwambiri mpaka kulimba kwake.… Mu zonse zovuta chikhalidwe, mtundu 301 ali wamakokedwe mphamvu ya 185,000 PSI osachepera, ndi osachepera zokolola mphamvu 140,000 PSI.