Nau'in 630, wanda aka fi sani da 17-4, shine mafi yawan bakin PH. Nau'in 630 bakin karfe ne na martensitic wanda ke ba da juriya mai inganci. Yana da maganadisu, mai walƙiya, kuma yana da kyawawan halaye na ƙirƙira, kodayake zai rasa ɗan ƙarfi a yanayin zafi mai girma. An san shi don juriya ga lalata-lalata, kuma ana amfani dashi a cikin masana'antu da aikace-aikace iri-iri ciki har da:
- Valves da gears
- Kayan aikin filin mai
- Propeller shafts
- Tushen famfo
- Valve spindles
- Jiragen sama da iskar gas
- Makamin nukiliya
- Injin takarda
- Kayan aikin sarrafa sinadarai
Domin a siyar dashi azaman Bakin Karfe Nau'in 630, dole ne ya ƙunshi sinadari na musamman wanda ya haɗa da:
- Cr 15-17.5%
- Ni 3-5%
- Mn 1%
- Si 1%
- P 0.040%
- S 0.03%
- Ku 3-5%
- Nb+Ta 0.15-0.45%
Lokacin aikawa: Oktoba-09-2020