Biraha birta aan lahayni waa biro-daawaha sare leh kuwaaso iska caabbinta daxalka sare leh marka loo eego birta kale sababtoo ah joogitaanka xaddi badan oo chromium ah. Iyada oo ku saleysan qaab dhismeedka crystalline, waxay u qaybsan yihiin saddex nooc sida birta birta ah, austenitic, iyo martensitic. Koox kale oo ka mid ah birta aan-ka-soo-baxa lahayn ayaa ah birta roobka-adag. Waxay yihiin isku-dhafka birta-martensitic iyo austenitic.
Fasalka 440C birta aan lahayn waa bir aan lahayn kaarboon martensitic sare. Waxay leedahay xoog sare, iska caabin daxalka dhexdhexaad ah, iyo engegan wanaagsan oo xidho iska caabin. Fasalka 440C wuxuu awood u leeyahay inuu gaaro, daaweynta kulaylka ka dib, xoogga ugu sarreeya, qallafsanaanta iyo xirashada caabbinta dhammaan Alloysyada aan nadiifka ahayn. Kaarboonka aadka u sarreeya ayaa mas'uul ka ah sifooyinkan, kaas oo ka dhigaya 440C si gaar ah ugu habboon codsiyada sida kubbadaha iyo qaybaha valve.
Isku dhafka kiimikaad wuxuu u dhexeeyaa 440C birta aan lahayn
Fasalka440C | ||
Maaddooyinka | Min. | Max. |
Kaarboon | 0.95 | 1.20 |
Manganese | - | 1.00 |
Silikoon | - | 1.00 |
Fosfooraska | - | 0.040 |
Baaruud | - | 0.030 |
Chromium | 16.00 | 18.00 |
Molybdenum | - | 0.75 |
Birta | Dheelitiran |
Guryaha jireed ee darajada 440 birta aan daahin
Darajo | Cufnaanta (kg/m3) | Qalabka Elastic (GPa) | Dhexdhexaadiyaha Balaadhinta kulaylka (mm/m/C) | Habdhaqanka Kulka (W/m.K) | Kuleylka Gaarka ah 0-100C (J/kg.K) |
Iska caabin koronto (nW.m) | |||
0-100C | 0-200C | 0-600C | at 100C | at 500C | |||||
440A /B/C | 7650 | 200 | 10.1 | 10.3 | 11.7 | 24.2 | - | 460 | 600 |
440C Tilmaamaha La Xiriira
USA | Jarmalka | Japan | Australia |
ASTM A276-98b 440C SAE 51440C AISI 440C UNS S44004 |
W.Nr 1.4125 X105CrMo17 | JIS G4303 SuS 440C | AS 2837-1986 440C |