I-Saky Steel ikhiqiza amashidi ensimbi engagqwali angu-440 aqinile namapuleti 440A, 440B, 440C
I-AISI 440A, UNS S44002, JIS SUS440A, W.-nr.1.4109 ( DIN X70CrMo15 ) amashidi ensimbi engagqwali, amapuleti, amafulethi
I-AISI 440B, UNS S44003, JIS SUS440B, W.-nr.1.4112 ( DIN X90CrMoV18 ) amashidi ensimbi engagqwali, amapuleti, amafulethi
I-AISI 440C, UNS S44004, JIS SUS440C, W.-nr.1.4125 ( DIN X105CrMo17 ) amashidi ensimbi engagqwali, amapuleti, amafulethi
440A 440B 440C isakhi samakhemikhali:
| Ibanga | C | Si | Mn | S | P | Cr | Ni | Mo |
| 440A | 0.60~0,75 | ≤1 | ≤1 | ≤0.030 | ≤0.040 | 16.00-18.00 | - | ≤0.75 |
| 440B | 0.85-0.95 | ≤1 | ≤1 | ≤0.030 | ≤0.035 | 16.00-18.00 | ≤0.60 | ≤0.75 |
| 440C | 0.95 - 1.20 | ≤1 | ≤1 | ≤0.030 | ≤0.040 | 16.00-18.00 | - | ≤0.75 |
Okuqukethwe kwekhabhoni nobulukhuni be-440A-440B-440C kukhuphuke ngokulandelana ukusuka ku-ABC (A-0.75%, B-0.9%, C-1.2%).I-440C iyinsimbi engagqwali enhle kakhulu ephezulu enobunzima obungu-56-58 RC.Lezi zinsimbi ezintathu zikwazi ukumelana nokugqwala okuhle, i-440A ihamba phambili, kanti i-440C iphansi kakhulu.I-440C ivame kakhulu.Ukwakheka kwamakhemikhali ensimbi engagqwali ye-martensitic kubonakala ngokungezwa kwezakhi ezifana ne-molybdenum, i-tungsten, i-vanadium, ne-niobium esekelwe kwinhlanganisela yezingxenye ezihlukene zika-0.1% -1.0% C kanye no-12% -27% Cr.Njengoba ukwakheka kwezicubu kuyisakhiwo se-cubic esigxile emzimbeni, amandla ehla kakhulu emazingeni okushisa aphezulu.Ngaphansi kuka-600 ° C, amandla okushisa aphezulu aphakeme kakhulu kuzo zonke izinhlobo zensimbi engagqwali, futhi amandla okukhasa nawo aphezulu kakhulu.I-440A inezindawo ezinhle kakhulu zokucisha nokuqinisa kanye nobulukhuni obuphezulu.Inokuqina okuphezulu kunensimbi engu-440B nensimbi engu-440C.I-440B isetshenziselwa amathuluzi okusika, amathuluzi okulinganisa, ama-bearing nama-valve.Inokuqina okuphakeme kunensimbi engu-440A kanye nokuqina okuphezulu kunensimbi engu-440C.I-440C inokuqina okuphezulu kakhulu kwazo zonke insimbi engagqwali nensimbi engashisi futhi isetshenziselwa imibhobho namabheringi.I-440F iyizinga lensimbi elithuthukisa izakhiwo ezisikeka kalula zensimbi engu-440C kumalebula azenzakalelayo.
Isikhathi sokuthumela: Aug-17-2018