Saky karfe Martensitic bakin karfe ne wani nau'i na chromium bakin karfe wanda kula martensitic microstructure a dakin da zazzabi, wanda kaddarorin za a iya gyara ta zafi magani (quenching da tempering). Gabaɗaya magana, wani nau'in bakin karfe ne mai tauri. Bayan quenching, tempering da annealing tsari, Taurin bakin karfe 440 ya inganta sosai fiye da na sauran bakin karfe masu jure zafi. Ana amfani da ita sosai wajen kera kayan aiki, yankan kayan aiki, ko gyare-gyaren filastik waɗanda ke buƙatar manyan lodi da juriya a ƙarƙashin yanayin lalata. American misali 440 jerin bakin karfe ciki har da: 440A, 440B, 440C, 440F. Abubuwan da ke cikin carbon na 440A, 440B da 440C sun ƙaru a jere. 440F (ASTM A582) nau'in karfe ne na yankan kyauta tare da abun cikin S da aka ƙara akan 440C.
Daidai Maki Na 440 SS
| Ba'amurke | ASTM | 440A | 440B | 440C | 440F |
| UNS | S44002 | S44003 | S44004 | S44020 | |
| Jafananci | JIS | SUS 440A | SUS 440B | SUS 440C | SUS 440F |
| Jamusanci | DIN | 1.4109 | 1.4122 | 1.4125 | / |
| China | GB | 7Cr17 | 8Cr17 | 11Cr17 9Cr18Mo | Y11Cr17 |
Abubuwan Sinadarai Na 440 SS
| Maki | C | Si | Mn | P | S | Cr | Mo | Cu | Ni |
| 440A | 0.6-0.75 | ≤1.00 | ≤1.00 | ≤0.04 | ≤0.03 | 16.0-18.0 | ≤0.75 | (≤0.5) | (≤0.5) |
| 440B | 0.75-0.95 | ≤1.00 | ≤1.00 | ≤0.04 | ≤0.03 | 16.0-18.0 | ≤0.75 | (≤0.5) | (≤0.5) |
| 440C | 0.95-1.2 | ≤1.00 | ≤1.00 | ≤0.04 | ≤0.03 | 16.0-18.0 | ≤0.75 | (≤0.5) | (≤0.5) |
| 440F | 0.95-1.2 | ≤1.00 | ≤1.25 | ≤0.06 | 0.15 | 16.0-18.0 | / | (≤0.6) | (≤0.5) |
Lura: ana ba da izinin ƙima a cikin maƙallan ba dole ba.
Hardness na 440 SS
| Maki | Hardness, Annealing (HB) | Maganin zafi (HRC) |
| 440A | ≤255 | ≥54 |
| 440B | ≤255 | ≥56 |
| 440C | ≤269 | ≥58 |
| 440F | ≤269 | ≥58 |
Kama da talakawa gami karfe, Saky karfe ta 440 jerin Martensite bakin karfe yana da halaye na hardening ta hanyar quenching, kuma zai iya samun fadi da kewayon inji Properties ta daban-daban zafi magani. Gabaɗaya, 440A yana da kyakkyawan aiki mai ƙarfi da ƙarfi, kuma taurinsa ya fi na 440B da 440C. 440B yana da taurin mafi girma da tauri fiye da 440A da 440C don kayan aikin yankan, kayan aikin aunawa, bearings da bawuloli. 440C yana da mafi girman taurin duk bakin karfe da karfe mai jure zafi don kayan aikin yankan inganci, nozzles da bearings. 440F karfe ne mai yankewa kyauta kuma ana amfani dashi galibi a cikin lathes ta atomatik.
Lokacin aikawa: Yuli-07-2020