Chii chinonzi Astm a269 chubhu?

Isu tiri vagadziri vemachubhu esimbi isina ngura eASTM A249, ASTM A249 Coil, chubhu iyi ndiyo yakajairika yeASTM A249. Pamusoro payo pakajeka, kureba kwayo i4000m/Coil, chubhu iyi yakapfava, inogona kushandiswa pakugadzira mafuta, kuisa mapaipi, zvishandiso.