S355j2h wopanda chitsulo wopanga chitoliro wogulitsa chitsimikizo
S355J2 itsatira en10025-2:2004 (Muyezo wakale (en10025:1990)
C: ≤0.22; Si: ≤0.55; Mn: ≤1.60; P: ≤0.025; S: ≤0.025; Kulemera: ≤0.55;
-20℃: ≥27.
(Mpa): ≤16mm: ≥355: 16—40: ≥345; 40—63: ≥335; 63—80: ≥325;
80—100: ≥315; 100—150: 295; 150—200: ≥285; 200—250: ≥275; 250—400:≥265.
S355jo ndi chinthu chopangidwa ku Europe chotentha chopangidwa ndi chitsulo.
S355jo imagwiritsa ntchito muyezo wa en10025-2:2004 (Old standard (en10025:1990)
Kutentha kozimitsa kwa chitoliro chachitsulo chotsika ndi A3 + (30 ~ 50) ℃. Pochita, malire apamwamba amatengedwa nthawi zambiri. Kutentha kwakukulu kozimitsa kumatha kufulumizitsa liwiro la kutentha kwa chitoliro chachitsulo chotsika, kuchepetsa makutidwe ndi okosijeni padziko ndikuwongolera magwiridwe antchito. Kuti homogenize ndi austenite wa workpiece, yokwanira kugwira nthawi chofunika. Ngati ng'anjo yeniyeni yodzaza ng'anjo ndi yayikulu, nthawi yogwira iyenera kukulitsidwa moyenera. Apo ayi, kuuma kosakwanira kungachitike chifukwa cha kutentha kosiyana. Komabe, ngati nthawi yogwirayo ndi yayitali kwambiri, kuipa kwa tirigu wobiriwira komanso decarburization yayikulu ya okosijeni idzawonekeranso, zomwe zingakhudze mtundu wozimitsa. Timakhulupirira kuti ngati ndalama zolipiritsa zili zochulukirapo kuposa zomwe zafotokozedwa m'mabuku, nthawi yotenthetsera ndi yogwira iyenera kukulitsidwa ndi 1/5.
Chifukwa kuuma kwa chitoliro chachitsulo chotsika ndi chotsika, 10% ya brine solution yokhala ndi kuzizira kwakukulu iyenera kugwiritsidwa ntchito. The workpiece ayenera kuzimitsidwa bwinobwino atalowa m'madzi, koma osati ozizira bwino. Ngati 45 # mwatsatanetsatane zitsulo chitoliro utakhazikika bwino m'madzi amchere, workpiece akhoza kusweka, amene amayamba ndi kusintha mofulumira austenite mu martensite pamene workpiece utakhazikika pafupifupi 180 ℃, chifukwa kwambiri structural nkhawa. Choncho, pamene kuzimitsidwa otsika kutentha zitsulo chitoliro chitoliro mofulumira utakhazikika kudera kutentha, pang'onopang'ono kuzirala njira ayenera anatengera. Popeza kutentha kwa madzi akutuluka kumakhala kovuta kudziwa, kuyenera kuyendetsedwa ndi chidziwitso. Pamene kugwedezeka kwa workpiece m'madzi kuyimitsa, madzi otulutsirako amatha kukhala mpweya utakhazikika (kuzizira kwamafuta kuli bwino). Kuonjezera apo, workpiece iyenera kusuntha m'malo mokhazikika pamene ikulowa m'madzi, ndikuyenda mokhazikika molingana ndi geometry ya workpiece. Sing'anga kuzirala sing'anga ndi malo amodzi workpiece kumabweretsa kuuma mosagwirizana ndi kupsinjika, kumabweretsa kupindika kwakukulu komanso kusweka kwa workpiece.
Kuuma kozimitsidwa kwa chitoliro chotsika chachitsulo chozimitsidwa ndi magawo otenthedwa kuyenera kufika hrc56 ~ 59, ndipo kuthekera kwa gawo lalikulu ndikotsika, koma sikuyenera kukhala kotsika kuposa hrc48. Kupanda kutero, zikutanthauza kuti chogwiriracho sichinazimitsidwe kwathunthu, ndipo mawonekedwe a sorbite kapena ferrite atha kuwoneka. Kapangidwe kameneka kakasungidwabe mu matrix kudzera mu kutenthetsa, komwe sikungathe kukwaniritsa cholinga chozimitsa ndi kutentha.
Pakutentha kwapamwamba kwa chitoliro chachitsulo chotsika kwambiri pambuyo pozimitsa, kutentha kwa kutentha kumakhala 560 ~ 600 ℃, ndipo kuuma kofunikira ndi hrc22 ~ 34. osiyanasiyana ndi ambiri. Komabe, ngati chojambulacho chili ndi zofunikira zolimba, kutentha kwa kutentha kumasinthidwa malinga ndi zofunikira zojambula kuti zitsimikizire kuuma. Mwachitsanzo, ena shaft otsika kutentha zitsulo mapaipi amafuna mkulu mphamvu ndi mkulu kuuma; Kwa magiya ena ndi magawo a shaft okhala ndi keyway, kuuma kofunikira kumakhala kotsika chifukwa amayenera kugayidwa ndikulowetsedwa pambuyo pozimitsa ndi kutentha. Kutentha kwanthawi yayitali kumatengera kuuma kofunikira komanso kukula kwa workpiece. Timakhulupirira kuti kuuma pambuyo tempering kumadalira kutentha kutentha ndipo alibe chochita ndi tempering nthawi, koma ayenera alowenso. Nthawi zambiri, kutenthetsa nthawi ya workpiece ndi yoposa ola limodzi.
