Saky Steel amapanga mapepala ndi mbale zachitsulo zosapanga dzimbiri zokhazikika zokhazikika zotchedwa martensitic 440 series 440A, 440B, 440C
Mapepala a AISI 440A, UNS S44002, JIS SUS440A, W.-nr. 1.4109 (DIN X70CrMo15) achitsulo chosapanga dzimbiri, mbale, ndi ma flats
Mapepala a AISI 440B, UNS S44003, JIS SUS440B, W.-nr. 1.4112 (DIN X90CrMoV18) achitsulo chosapanga dzimbiri, mbale, ndi ma flats
Mapepala a AISI 440C, UNS S44004, JIS SUS440C, W.-nr. 1.4125 (DIN X105CrMo17) achitsulo chosapanga dzimbiri, mbale, ndi ma flats
440A 440B 440C mankhwala opangidwa:
| Giredi | 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 |
Kuchuluka kwa mpweya ndi kuuma kwa 440A-440B-440C kunawonjezeka motsatizana kuchokera ku ABC (A-0.75%, B-0.9%, C-1.2%). 440C ndi chitsulo chosapanga dzimbiri chabwino kwambiri chokhala ndi kuuma kwa 56-58 RC. Zitsulo zitatuzi zili ndi kukana dzimbiri bwino, 440A ndiye wabwino kwambiri, ndipo 440C ndiye wotsika kwambiri. 440C ndi yofala kwambiri. Kapangidwe ka mankhwala ka chitsulo chosapanga dzimbiri cha martensitic kamadziwika ndi kuwonjezera zinthu monga molybdenum, tungsten, vanadium, ndi niobium kutengera kuphatikiza kwa zigawo zosiyanasiyana za 0.1%-1.0% C ndi 12%-27% Cr. Popeza kapangidwe ka minofu ndi kapangidwe ka cubic kozungulira thupi, mphamvu imatsika kwambiri kutentha kwambiri. Pansi pa 600 ° C, mphamvu yotentha kwambiri ndiyo yapamwamba kwambiri pakati pa mitundu yonse ya chitsulo chosapanga dzimbiri, ndipo mphamvu yoyenda nayonso ndiyo yapamwamba kwambiri. 440A ili ndi mphamvu zabwino kwambiri zozimitsira ndi kulimbitsa komanso kulimba kwambiri. Ili ndi mphamvu zambiri kuposa chitsulo cha 440B ndi chitsulo cha 440C. 440B imagwiritsidwa ntchito podulira zida, zida zoyezera, mabearing ndi ma valve. Ili ndi kulimba kwambiri kuposa chitsulo cha 440A komanso kulimba kwambiri kuposa chitsulo cha 440C. 440C ili ndi kulimba kwakukulu kuposa chitsulo chosapanga dzimbiri komanso chitsulo chosagwira kutentha ndipo imagwiritsidwa ntchito pa nozzles ndi mabearing. 440F ndi kalasi yachitsulo yomwe imawongolera kudulidwa kosavuta kwa chitsulo cha 440C pamakina odzipangira okha.
Nthawi yotumizira: Ogasiti-17-2018