Izinto ezisemgangathweni ze-254SMO zihlala zinexabiso elifanelekileyo kwimilo yazo yeekhemikhali, icandelo ngalinye linomsebenzi walo:
I-Nickel (Ni): I-Nickel inokunyusa amandla entsimbi ye-254SMO ngelixa igcina i-plasticity kunye nokuqina okuhle. I-Nickel inokumelana nokugqwala okuphezulu kwii-asidi kunye ne-alkalis, kwaye inokumelana nokugqwala kunye nobushushu kumaqondo obushushu aphezulu.
I-Molybdenum (Mo): I-Molybdenum ingacoca isiseko sentsimbi ye-254SMO, iphucule ukuqina kwayo kunye namandla ayo obushushu, kwaye igcine amandla aneleyo kunye nokumelana nokuqhekeka kwayo kumaqondo obushushu aphezulu (uxinzelelo lwexesha elide kumaqondo obushushu aphezulu, ukuguquka kwayo, utshintsho oluqhekekayo).
I-Titanium (Ti): I-Titanium yi-deoxidizer enamandla kwintsimbi ye-254SMO. Ingenza ulwakhiwo lwangaphakathi lwentsimbi lube lukhuni, iphucule amandla okubola; inciphise ubuthathaka bokwaluphala kunye nokubuthathaka kokubanda. Iphucule ukusebenza kwe-welding. Ukongezwa kwe-titanium efanelekileyo kwi-chromium 18 nickel 9 austenitic stainless steel kuthintela ukugqwala kwe-intergranular.
I-Chromium (Cr): I-Chromium inokuphucula ukumelana nokugqwala kwentsimbi kwaye ke ngoko yinto ebalulekileyo yokudibanisa intsimbi engagqwaliyo ye-254SMO kunye nentsimbi engatshiyo.
I-Copper (Cu): I-Copper inokunyusa amandla kunye nokuqina, ingakumbi xa kukho umhlwa emoyeni. Ingxaki kukuba ukubhitya okushushu kudla ngokuvela xa kushushu kwaye i-plasticity ye-copper idlula i-0.5%. Xa umxholo we-copper ungaphantsi kwe-0.50%, akukho mpembelelo ekunyibilikiseni kwezinto ze-254SMO.
Ngokusekelwe kumahluko kwiinxalenye eziphambili ezingentla, ezi ntlobo zilandelayo ze-254SMO nickel alloys zingasetyenziswa:
1. I-alloy ye-nickel-copper (Ni-Cu), ekwaziwa ngokuba yi-alloy ye-Monel (i-alloy ye-Monel)
2. I-alloy ye-nickel-chromium (Ni-Cr) yi-alloy exhathisa ubushushu esekelwe kwi-nickel.
3. I-Ni-Mo alloy ibhekisa ikakhulu kuthotho lweHastelloy B
4. I-alloy yeNi-Cr-Mo ibhekisa ikakhulu kuthotho lweHastelloy C
I-254SMO isetyenziswa kwizixhobo ezahlukeneyo zoshishino, ukusetyenziswa kwayo ngaphakathi kwemithombo yamagqabi, imithombo ye-coil, iindawo zokuvala, ii-manifolds ze-exhaust ze-automotive, ii-catalytic converters, ii-EGR coolers, ii-turbochargers kunye nezinye ii-gaskets ezimelana nobushushu, ii-aircraft Austenitic stainless steel plates zisetyenziselwa iindawo ezidibeneyo.
Ngokukodwa, inxalenye yezicelo zezixhobo ezahlukeneyo zoshishino, ii-gaskets ze-exhaust zeemoto, njl. ezisetyenziswa phantsi kobushushu obuphezulu zisebenzisa i-NPF625 kunye ne-NCF718 echazwe kwi-JIS G 4902 (ipleyiti ye-superalloy engamelani nokugqwala kunye nobushushu) ukuqulatha iipesenti zobunzima. Ingaphezulu kwe-50% yezinto ezibizayo ze-Ni. Kwelinye icala, kwizixhobo ezifana nentsimbi engagqwaliyo ephuculweyo njenge-SUH660 esebenzisa iikhompawundi ze-intermetallic ze-Ti kunye ne-Al ezichazwe kwi-JIS G 4312 (ipleyiti yentsimbi engamelani nobushushu), ubunzima be-254 SMO buyehla kakhulu xa busetyenziswa ixesha elide kubushushu obuphezulu, kwaye kuphela Ukusetyenziswa ukuya kuthi ga kwi-500°C akwanelisi iimpawu ezifunekayo kwii-gaskets ezingamelani nobushushu ezikhuthazwe bubushushu obuphezulu kwiminyaka yakutshanje.
Uhlobo: 254SMO
Imigangatho yesizwe: 254SMO/F44 (UNS S31254/W.Nr.1.4547)
Amaqabane: i-Outokumpu, i-AVESTA, i-Hastelloy, i-SMC, i-ATI, iJamani, i-ThyssenKrupp VDM, i-Mannex, i-Nickel, i-Sandvik, i-Sweden iJapan Metallurgical, i-Nippon Steel kunye nezinye iimpawu ezidumileyo.
Uphawu lwaseMelika: UNS S31254
Isishwankathelo se-254SMo (S31254): Intsimbi engagqwaliyo eyomeleleyo kakhulu. Ngenxa yomxholo wayo ophezulu we-molybdenum, inokumelana okuphezulu kakhulu nokugqwala kwemingxuma kunye ne-cravice. Intsimbi engagqwaliyo ye-254SMo yaphuhliswa kwaye yaphuhliswa ukuze isetyenziswe kwiindawo ezine-halide ezifana namanzi olwandle.
I-254SMo (S31254) I-Super Stainless Steel luhlobo olukhethekileyo lwentsimbi engagqwali. Yahlukile kwintsimbi eqhelekileyo engagqwali ngokwemilo yeekhemikhali. Ibhekisa kwintsimbi engagqwali ene-alloy ephezulu equlethe i-nickel ephezulu, i-chromium ephezulu, kunye ne-molybdenum ephezulu. Intsimbi engagqwali ephezulu, i-alloy esekelwe kwi-nickel luhlobo olukhethekileyo lwentsimbi engagqwali, ulwakhiwo lokuqala lwekhemikhali lwahlukile kwintsimbi eqhelekileyo engagqwali, ibhekisa kwi-alloy ephezulu equlethe i-nickel ephezulu, i-chromium ephezulu, i-molybdenum ephezulu engagqwali. Eyona ingcono yi-254Mo, equlethe i-6% Mo. Olu hlobo lwentsimbi lunokumelana okuhle kakhulu nokugqwala kwendawo. Lunokumelana okuhle nokugqwala phantsi kwamanzi olwandle, umoya, izithuba, kunye neemeko zokukhukuliseka kwesantya esiphantsi (PI ≥ 40) kunye nokumelana okungcono kokugqwala koxinzelelo, ezinye izinto ze-alloys ezisekelwe kwi-Ni kunye ne-titanium alloys. Okwesibini, kubushushu obuphezulu okanye ukusebenza kokuxhathisa ukugqwala, lunokumelana okungcono kubushushu obuphezulu okanye ukuxhathisa ukugqwala, yi-304 intsimbi engagqwali ayinakutshintshwa. Ukongeza, ukusuka kuhlu lwentsimbi engagqwaliyo, isakhiwo esikhethekileyo se-metallographic yentsimbi engagqwaliyo sisakhiwo esizinzileyo se-austenite metallographic. Ngenxa yokuba le ntsimbi ikhethekileyo engagqwaliyo luhlobo lwezinto ezine-alloy ephezulu, inzima kakhulu kwinkqubo yokuvelisa. Ngokubanzi, abantu banokuxhomekeka kuphela kwinkqubo yendabuko yokwenza le ntsimbi ikhethekileyo engagqwaliyo, efana nokuthulula, ukubumba, ukuqengqeleka njalo njalo.
Kwangaxeshanye ineempawu zokumelana nobushushu obuphezulu ngolu hlobo lulandelayo:
1. Inani elikhulu leemvavanyo zasentsimini kunye namava amaninzi abonisa ukuba nokuba kumaqondo obushushu aphezulu kancinci, i-254SMO inokumelana nokugqwala okuphezulu emanzini olwandle, kwaye zimbalwa iintlobo zentsimbi engagqwaliyo ezinale mpawu.
2. Ukumelana nokugqwala kwe-254SMO kwizisombululo ze-asidi kunye nezisombululo ze-halide ezixidizing ezifana nezo zifunekayo kwimveliso ye-bleach esekwe ephepheni zinokuthelekiswa nee-alloys ze-nickel-base kunye nee-alloys ze-titanium ezimelana kakhulu nokugqwala.
Ixesha leposi: Epreli-24-2018