Ukufakwa kweBanga le-ASTM A105 kuveliswa kwi-carbon yensimbi ye-carbon stit. I-ASTM A105 ye-A105 yenzelwe ngomxholo wamachiza eNickel, iChromium, molybdenum, nobhedu, kunye ne-dadium. Olu ncedo lufanelekileyo ekunxibelelaniseni amabakala ahlukeneyo okufaka imizi-mveliso yeoyile negesi.