Ko te putorino maitai tuitui he momo putorino maitai, he teitei ake te mahi o te putorino maitai noa.Ko te putorino maitai o te Alloy he huānga penei i te silicon, manganese, chromium, nickel, molybdenum, tungsten, vanadium, titanium, niobium, zirconium, cobalt, konumohe, parahi, boron, whenua onge, etc.