Kutengera zomwe takumana nazo pamakampani, tikufuna kugawana zambiri zamafuta opangira ma locomotive crankshafts komanso kutentha kwa ma crankshafts.
Zida zazikulu zopangira ma crankshafts a dizilo ndi chitsulo chonyezimira ndi chitsulo cha ductile. Ma crankshafts opangira zitsulo, chifukwa cha kulimba kwawo komanso kulimba kwawo, amagwiritsidwa ntchito kwambiri m'magalimoto amakono amphamvu kwambiri a dizilo. 42CrMoA ndi 42CrMo4 ndi zina mwa zida zomwe zimagwiritsidwa ntchito kwambiri popanga ma crankshaft a dizilo chifukwa champhamvu komanso kulimba kwawo. Chifukwa ma crankshafts amanyamula katundu wosiyanasiyana panthawi yomwe akugwira ntchito, zopangirazo ziyenera kukhala zolimba kwambiri komanso zotulutsa mphamvu, kutalika, kuchepetsa malo, komanso mphamvu zamagetsi. Komanso, zipangizo zokhazo ziyenera kukumana ndi chiyero chapamwamba (zina za haidrojeni ndi zowonongeka zopanda zitsulo, ndi zina zotero) ndi zolondola kwambiri (kukumana ndi miyezo yamakampani a njanji monga TB /T3475.1-2017). Njira zochizira kutentha (kugudubuzika kwa crankshaft, nitriding pamwamba, ndi kulimba kwapakatikati) zimafunikiranso kukana kwamphamvu komanso kukana kutopa. Chifukwa cha zofooka zachibadwa ndi zolakwika, ma ductile iron crankshafts sagwiritsidwanso ntchito m'mayendedwe a njanji a dizilo.