20# bututun ƙarfe maras sumul yawanci yana amfani da 20# ingancin carbon karfe a matsayin ɗanyen abu, wanda shine bututun ƙarfe mai inganci mai jure zafi wanda akafi amfani dashi wajen ginin gine-gine da injina.

20# karfe yana da halaye masu zuwa: kyawawan filastik da ƙarfi mai ƙarfi. Saboda ƙarancin ƙarfinsa, ya dace da sarrafa sanyi da wuraren da ba su da ƙarfi.

20# za a iya amfani da bututun ƙarfe mara nauyi a cikin masana'antu masu zuwa:

1. Don ƙananan bututun tukunyar jirgi da matsakaici, ƙa'idodin aiwatarwa shineGB 3087, An yi amfani da shi don kera bututun zafi mai zafi da bututun bango mai sanyaya ruwa na matsakaicin matsakaici da ƙananan tukunyar jirgi (matsi na aiki ≤5.9 MPa), waɗanda ke cikin babban zafin jiki (≤480℃) + yanayin iskar oxygen na ruwa na dogon lokaci

2. Fetur fracturing bututu, aiwatar da misali neGB 9948, amfani da reactors, zafi Exchangers, da dai sauransu na man fetur refining raka'a, tuntubar acidic kafofin watsa labarai (H₂S, CO₂) da kuma high matsa lamba (har zuwa 15 MPa)

3. Babban kayan aikin taki, tsarin aiwatarwa shineGB 6479, An yi amfani da shi don babban matsin lamba (10 ~ 32 MPa) kayan aikin taki irin su ammonia na roba da urea, tuntuɓar kafofin watsa labaru masu lalata sosai (kamar ammonia ruwa, urea narke)

Hot-birgima sumul karfe bututu don na'ura mai aiki da karfin ruwa goyon bayan, da aiwatar da misali neGB/T17396, An yi amfani da shi don ginshiƙan tallafi na hydraulic da jacks a cikin ma'adinan kwal, kuma suna jure wa manyan nau'o'in sauye-sauye (50 ~ 100 MPa) da tasirin tasiri.