Insimbi engagqwali iqoqo lama-alloys ayoni eliqukethe ubuncane obungaba ngu-11% we-chromium, ukwakheka okuvimbela i-ayoni ukuthi ingagqwali futhi inikeza izakhiwo ezimelana nokushisa.Izinhlobo ezihlukene zensimbi engagqwali zihlanganisa izakhi ze-carbon (kusuka ku-0.03% ukuya kokukhulu kune- 1.00%), i-nitrogen, i-aluminium, i-silicon, isulfure, i-titanium, i-nickel, ithusi, i-selenium, i-niobium, ne-molybdenum.Izinhlobo ezithile zensimbi engagqwali zivame ukuqokwa ngenombolo yazo enezinombolo ezintathu ze-AISI, isb, 304 stainless.Izinga le-ISO 15510 lifaka ohlwini ukwakheka kwamakhemikhali kwezinsimbi ezingenasici zokucaciswa kwamazinga akhona e-ISO, ASTM, EN, JIS, kanye ne-GB (Chinese) kuthebula lokushintshana eliwusizo.
Insimbi engagqwali imelana nokugqwala ibangelwa ukuba khona kwe-chromium kungxubevange, eyenza ifilimu ye-passive evikela into engaphansi ekuhlaselweni kokugqwala, futhi ekwazi ukuziphilisa uma kukhona umoya-mpilo.Ukumelana nokubola kungandiswa ngokuqhubekayo ngezindlela ezilandelayo. :
1. khuphula okuqukethwe kwe-chromium kube ngaphezu kuka-11%.
2. engeza i-nickel okungenani ku-8%.
3. engeza i-molybdenum (ebuye ithuthukise ukumelana nokugqwala kwe-pitting).
Ukwengezwa kwe-nitrogen futhi kuthuthukisa ukumelana nokugqwala kwemigodi futhi kwandisa amandla emishini.Ngakho-ke, kunamabanga amaningi ensimbi engagqwali enokuqukethwe okuhlukahlukene kwe-chromium ne-molybdenum ukuze ivumelane nemvelo ingxubevange okufanele ibekezelele.
Ukumelana nokugqwala nokungcola, ukunakekelwa okuphansi, nokucwebezela okujwayelekile kwenza insimbi engagqwali ibe into efanelekile ezinhlelweni eziningi lapho kokubili amandla ensimbi nokugqwala kuyadingeka.Ngaphezu kwalokho, insimbi engagqwali ingagoqeka ibe amashidi, amapuleti, imigoqo, izintambo, namashubhu.Lezi zingasetshenziswa ezitsheni zokupheka, ezitsheni, ezintweni zokuhlinza, ezimpahleni ezinkulu, ezimotweni, ezintweni zokwakha ezakhiweni ezinkulu, ezisetshenziswa ezimbonini (isb., ezigayweni zamaphepha, ezitshalweni zamakhemikhali, ekuhlanzeni amanzi), nasemathangeni namathangi okugcina amakhemikhali nemikhiqizo yokudla.Ukumelana nokugqwala kwempahla, ukuthi ingahlanzwa kalula futhi ifakwe inzalo, kanye nokungabikho kwesidingo sezinto ezimbozwe ngaphezulu kwenze ukuthi kusetshenziswe insimbi engagqwali emakhishini nasezimbonini zokucubungula ukudla.
Insimbi engagqwali i-Austenitic iwumndeni omkhulu wezinsimbi ezingenasici, ezakha cishe izingxenye ezimbili kwezintathu zayo yonke ukukhiqizwa kwensimbi engagqwali (bona izibalo zokukhiqiza ngezansi).Zine-austenitic microstructure, okuyisakhiwo sekristalu eyi-cubic crystal egxile ebusweni.Le microstructure ifinyelelwa ngokuhlanganisa insimbi ene-nickel eyanele kanye/noma i-manganese nenitrogen ukuze kugcinwe i-austenitic microstructure kuwo wonke amazinga okushisa, kusukela endaweni ye-cryogenic ukuya endaweni encibilikayo. .Ngakho-ke, izinsimbi ezingenasici ze-austenitic aziqiniseki ngokwelashwa okushisa njengoba zine-microstructure efanayo kuwo wonke amazinga okushisa.
Izinsimbi ezingenasici ze-Austenitic zingahlukaniswa futhi zibe amaqenjana amancane amabili, uchungechunge lwama-200 kanye nochungechunge lwama-300:
Uchungechunge lwama-200 ama-alloys e-chromium-manganese-nickel akhulisa ukusetshenziswa kwe-manganese ne-nitrogen ukuze kuncishiswe ukusetshenziswa kwe-nickel.Ngenxa yokwengeza kwabo i-nitrogen, banamandla cishe angu-50% esivuno esiphezulu kunamashidi angu-300 ensimbi angenasici.
Uhlobo lwe-201 luqinile ngokusebenza okubandayo.
Uhlobo lwama-202 luyinsimbi engagqwali enenhloso ejwayelekile.Ukuncipha kokuqukethwe kwe-nickel nokwanda kwe-manganese kuphumela ekumelaneni nokugqwala okubuthakathaka.
300 uchungechunge amaalloyi e-chromium-nickel afinyelela i-austenitic microstructure yawo cishe ngokukhethekile nge-nickel alloying;amanye amamaki ane-alloyed ephezulu kakhulu afaka i-nitrogen ukuze kwehliswe izidingo ze-nickel.Uchungechunge lwe-300 yiqembu elikhulu futhi elisetshenziswa kakhulu.
Uhlobo 304: Ibanga elaziwa kakhulu iType 304, elibuye laziwe ngokuthi 18/8 kanye no-18/10 ngokwakhiwa kwalo okungu-18% chromium kanye ne-8%/10% nickel, ngokulandelana.
Thayipha i-316: Insimbi yesibili ye-austenitic ejwayeleke kakhulu yi-Type 316. Ukwengezwa kwe-2% molybdenum kunikeza ukumelana okukhulu nama-acids kanye nokugqwala kwendawo okubangelwa ama-ion e-chloride.Izinguqulo zekhabhoni ephansi, njenge-316L noma 304L, zinekhabhoni engaphansi kuka-0.03% futhi zisetshenziselwa ukugwema izinkinga zokugqwala ezibangelwa ukushisela.
Izinsimbi ezingenasici ze-Martensitic zingaphathwa ngokushisa ukuze zinikeze izakhiwo ezingcono zokuwalungisa.
Ukwelashwa kokushisa ngokuvamile kuhilela izinyathelo ezintathu:
I-Austenitizing, lapho insimbi ishiselwa khona ekushiseni okuphakathi kwe-980-1,050 ° C (1,800-1,920 ° F), kuye ngokuthi ibanga.I-austenite ewumphumela inokwakheka kwekristalu eyi-cubic egxile ebusweni.
Ukucisha.I-austenite iguqulwa ibe i-martensite, isakhiwo sekristalu esiqinile esigxile emzimbeni we-tetragonal.I-martensite ecishiwe inzima kakhulu futhi i-brittle kakhulu ezinhlelweni eziningi.Enye i-austenite eyinsalela ingase ihlale.
Ukuthukuthela.I-Martensite ishisiswe ifike ku-500 °C (932 °F), igcinwe ezingeni lokushisa, bese ipholiswa ngomoya.Amazinga okushisa aphezulu anciphisa amandla esivuno namandla okuqina kodwa andisa ubude kanye nokumelana nomthelela.
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