Oorun yoo pese awọn laini ẹgbẹ pẹlu awọn aṣayan atẹle lati baamu awọn ohun elo oriṣiriṣi fun awọn apanirun:
1, Alloy irin
2, irin manganese
3, Irin Martensitic
4, Chrome funfun irin
5, Metal apapo (Aṣayan igbesi aye ti o gbooro)
Jọwọ kan si wa fun awọn alaye diẹ sii.