Zvese zvinhu zviri muindasitiri zvine nhoroondo refu, asi nhasi tinonyanya kutaura nezvekuvandudzwa kwenhoroondo yeAlloy Simbi Kukanganwirwa.
Kubva kuhondo yechipiri yenyika kusvika kuma1960s,Alloy Simbi Kukanganwirwadzaive kunyanya nguva yekuvandudzwa kweiyo yakakwira-simba simbi uye Ultra-yakakwira-simba simbi. Nekuda kwezvinodiwa zveairaidhi yedhisheni uye kukudziridzwa kweRokeths tekinoroji, manyorerwo ivatsva-matsva, akanyanya kuomesa simba rakanyanya simbi Iwo anomiririra esimbi gadziri. Alloy Simbi yakatanga kukudziridza munzira yekuchena kwakanyanya, yakakwirira chaiyo uye Ultra-yakaderera kabhoni. Maraging Simbi uye Ultra-yakachena Ferrite yakaonekwa zvakare.New Stor Steel Grades yakadai sesimbi isina tsvina.