He tino pai tonu te hanganga matū o te rauemi kounga 254SMO, he mahi motuhake tā ia wāhanga:
Nikara (Ni): Ka taea e te nikara te whakanui ake i te kaha o te maitai 254SMO me te pupuri tonu i te kirihou me te pakari. He ātete nui te nikara ki te waikura ki ngā waikawa me ngā kawakore, ā, he ātete ki te waikura me te wera i ngā pāmahana teitei.
Molybdenum (Mo): Ka taea e te Molybdenum te whakapai ake i te kakano o te maitai 254SMO, te whakapai ake i te pakeketanga me te kaha wera, me te pupuri i te kaha me te ātete ngokingoki i ngā pāmahana teitei (te ahotea roa i ngā pāmahana teitei, te whakarerekētanga, te huringa ngokingoki).
Taitānia (Ti): He kaha te tango waikura o te taitānia i roto i te maitai 254SMO. Ka taea e ia te whakakīkī i te hanganga o roto o te maitai, te whakapai ake i te kaha o te kakano; te whakaiti i te aro ki te koroheketanga me te pakarukaru makariri. Te whakapai ake i te mahi whakarewa. Mā te tāpiri i te taitānia tika ki te maitai kore waikura chromium 18 nickel 9 austenitic ka ārai i te waikura intergranular.
Konukōmiuma (Cr): Ka taea e te konukōmiuma te whakapai ake i te ātete ki te waikura o te maitai, nō reira he huānga whakarewa nui o te maitai kore waikura 254SMO me te maitai ātete wera.
Parahi (Cu): Ka taea e te parahi te whakanui ake i te kaha me te pakari, inā koa i te waikura o te hau. Ko te ngoikoretanga ko te pakarukaru wera i te wā e mahi wera ana, ā, ko te kirihou o te parahi neke atu i te 0.5%. Ina iti iho te ihirangi parahi i te 0.50%, kāore he pānga ki te kaha o te whakarewa o te rauemi 254SMO.
I runga i ngā rerekētanga o ngā wāhanga matua o runga ake nei, ka taea te whakamahi i ngā momo koranu nikara 254SMO e whai ake nei:
1. Ko te konukōre nikara-parahi (Ni-Cu), e mōhiotia ana ko te konukōre Monel (konukōre Monel)
2. He koranu ātete wera te nikara-kōroma (Ni-Cr).
3. Ko te koranu Ni-Mo e pā ana ki te raupapa Hastelloy B
4. Ko te koranu Ni-Cr-Mo e pā ana ki te raupapa Hastelloy C
E whakamahia ana te 254SMO i roto i ngā taputapu ahumahi maha, ā, ko ōna whakamahinga ā-roto ko ngā puna rau, ngā puna koiri, ngā wāhanga hiri, ngā manifold hauā waka, ngā kaitahuri catalytic, ngā whakamatao EGR, ngā turbocharger me ētahi atu gasket ātete-wera, ā, ko ngā pereti maitai kore waikura Austenitic waka rererangi e whakamahia ana mō ngā wāhanga hono.
Ina koa, ko tētahi wāhanga o ngā tono mō ngā taputapu ahumahi, ngā pēke hauātanga waka, me ētahi atu e whakamahia ana i raro i te pāmahana teitei e whakamahi ana i te NPF625 me te NCF718 kua tohua i roto i te JIS G 4902 (pereti koranu ātete-waikura me te ātete-wera) hei pupuri i ngā ōrau papatipu. Neke atu i te 50% o te rauemi utu nui o te Ni. I tētahi atu taha, mō ngā rauemi pēnei i te maitai kore waikura whakarei-uaua pēnei i te SUH660 e whakamahi ana i ngā matū whakarewa o te Ti me te Al kua tohua i roto i te JIS G 4312 (pereti maitai ātete-wera), ka tino heke te pakeke o te 254 SMO ina whakamahia mō te wā roa i ngā pāmahana teitei, ā, ko te whakamahinga tae atu ki te 500°C anake kāore e tutuki i ngā āhuatanga e hiahiatia ana mō ngā pēke ātete-wera kua whakatairangahia e te pāmahana teitei i ngā tau tata nei.
Waitohu: 254SMO
Ngā paerewa ā-motu: 254SMO/F44 (UNS S31254/W.Nr.1.4547)
Hoa mahi: Outokumpu, AVESTA, Hastelloy, SMC, ATI, Tiamana, ThyssenKrupp VDM, Mannex, Nickel, Sandvik, Huitene Japan Metallurgical, Nippon Steel me ētahi atu waitohu rongonui.
Waitohu Amerikana: UNS S31254
Tirohanga Whānui mō te 254SMo (S31254): He maitai kore waikura tino austenitic. Nā te nui o te molybdenum, he tino ātete ki te waikura poka me te waikura kapiti. I whakawhanakehia te maitai kore waikura 254SMo, ā, i whakawhanakehia mō te whakamahi i roto i ngā taiao kei roto he halide pērā i te wai moana.
Ko te 254SMo (S31254) Super Stainless Steel he momo motuhake o te kowiri tira. He rerekē i te kowiri tira noa i runga i te hanganga matū. E pā ana ki te kowiri tira teitei-konumohe kei roto he nikara teitei, he chromium teitei, me te molybdenum teitei. Ko te kowiri tira teitei, ko te koranu nikara he momo motuhake o te kowiri tira, ko te hanganga matū tuatahi he rerekē i te kowiri tira noa, e pā ana ki te koranu teitei kei roto he koranu teitei, he chromium teitei, he molybdenum teitei. Ko te mea pai ko te 254Mo, kei roto he 6% Mo. He tino pai te ātete o tēnei momo maitai ki te waikura ā-rohe. He pai te ātete ki te waikura poka i raro i te wai moana, te hau, ngā āputa, me ngā āhuatanga horo tere-iti (PI ≥ 40) ā, he pai ake te ātete ki te waikura ahotea, he rauemi kē atu mō ngā koranu Ni me ngā koranu titanium. Tuarua, i roto i te mahi ātete pāmahana teitei, te waikura rānei, he pai ake te ātete ki te pāmahana teitei, te waikura rānei, kāore e taea te whakakapi i te kowiri tira 304. Hei tāpiritanga, mai i te whakarōpūtanga o te kowiri tira, ko te hanganga whakarewa kowiri tira motuhake he hanganga whakarewa austenite pumau. Nā te mea he momo rauemi koranu-teitei tēnei kowiri tira motuhake, he tino uaua te tukanga hanga. I te nuinga o te wā, ka taea e te tangata te whakawhirinaki ki te tukanga tuku iho hei hanga i tēnei kowiri tira motuhake, pērā i te ringihanga, te hanga, te hurihuri me ētahi atu.
I taua wā anō, kei a ia ngā āhuatanga o te ātete ki te pāmahana teitei e whai ake nei:
1. He nui ngā whakamātautau mara me ngā wheako whānui e whakaatu ana ahakoa i ngā pāmahana teitei ake, he ātete teitei te 254SMO ki te waikura i roto i te wai moana, ā, he torutoru noa iho ngā momo maitai kore waikura he rite tēnei āhuatanga.
2. Ka taea te whakarite i te ātete waikura o te 254SMO i roto i ngā otinga waikawa me ngā otinga halide whakapūkara pērā i ngā mea e hiahiatia ana mō te hanga wai mā te pepa ki ngā koranu turanga-nikara me ngā koranu titanium e tino ātete ana ki te waikura.
Wā tuku: 24 Paenga-whāwhā 2018