I-A105, lokhu okuqukethwe kunekhabhun, i-manganese, phosphorus, isibabule, i-silico, ithusi, i-nickel, i-chromium, i-molybdenum ne-varium ekwakhekeni kwayo. Njengoba ezinye izinto zingaphansi kwe-1% yokwakheka, lokhu kubizwa ngokuthi ama-carbon stekethi.