Loaʻa i ka mea 254SMO maikaʻi kahi waiwai maʻamau kūpono i kona ʻano kemika, loaʻa i kēlā me kēia ʻāpana kāna hana ponoʻī:
Nikela (Ni): Hiki i ka nikela ke hoʻonui i ka ikaika o ke kila 254SMO me ka mālama ʻana i ka plasticity maikaʻi a me ka paʻakikī. Loaʻa iā nikela ke kūpaʻa kiʻekiʻe i ka pala i nā waikawa a me nā alkalis, a he kūpaʻa i ka popo a me ka wela i nā mahana kiʻekiʻe.
Molybdenum (Mo): Hiki i ka Molybdenum ke hoʻomaʻemaʻe i ka palaoa o ke kila 254SMO, hoʻomaikaʻi i ka paʻakikī a me ka ikaika wela, a mālama i ka ikaika kūpono a me ke kūpaʻa kolo i nā mahana kiʻekiʻe (ke kaumaha lōʻihi i nā mahana kiʻekiʻe, deformation, loli kolo).
Titanium (Ti): He deoxidizer ikaika ka Titanium i loko o ke kila 254SMO. Hiki iā ia ke hoʻolilo i ke ʻano o loko o ke kila i mea paʻa, hoʻomaʻemaʻe i ka ikaika o ka palaoa; hoʻēmi i ka ʻike ʻelemakule a me ka brittleness anu. Hoʻomaikaʻi i ka hana kuʻi. ʻO ka hoʻohui ʻana o ka titanium kūpono i ka chromium 18 nickel 9 austenitic stainless steel e pale aku i ka corrosion intergranular.
Chromium (Cr): Hiki i ka Chromium ke hoʻomaikaʻi i ke kūpaʻa ʻana i ka pala o ke kila a no laila he mea hoʻohuihui koʻikoʻi o ke kila kila 254SMO a me ke kila kūpaʻa wela.
Keleawe (Cu): Hiki i ke keleawe ke hoʻonui i ka ikaika a me ka paʻakikī, ʻoi aku hoʻi i ka palaho lewa. ʻO ka hemahema, ʻo ia ka brittleness wela e kū mai ana i ka wā hana wela a ʻoi aku ka plasticity o ke keleawe ma mua o 0.5%. Ke emi ka nui o ke keleawe ma mua o 0.50%, ʻaʻohe hopena i ka solderability o ka mea 254SMO.
Ma muli o nā ʻokoʻa o nā ʻāpana nui i luna, hiki ke hoʻohana ʻia nā ʻano mea hoʻohui nickel 254SMO penei:
1. ʻO ka hui nikala-keleawe (Ni-Cu), i ʻike ʻia hoʻi ʻo Monel alloy (Monel alloy)
2. He mea hoʻohuihui pale wela ka nickel-chromium (Ni-Cr).
3. ʻO ka hui Ni-Mo e pili nui ana i ka moʻo Hastelloy B
4. ʻO ka hui Ni-Cr-Mo e pili nui ana i ka moʻo Hastelloy C
Hoʻohana ʻia ʻo 254SMO i nā lako hana ʻoihana like ʻole, kona hoʻohana kūloko ʻana i nā pūnāwai lau, nā pūnāwai coil, nā ʻāpana sila, nā manifolds hoʻopau kaʻa, nā mea hoʻololi catalytic, nā mea hoʻoluʻolu EGR, nā turbochargers a me nā gaskets pale wela ʻē aʻe, hoʻohana ʻia nā papa kila kila Austenitic mokulele no nā ʻāpana hui.
ʻOi aku ka nui, ʻo kahi ʻāpana o nā noi no nā lako hana ʻoihana like ʻole, nā gaskets hoʻopau kaʻa, a me nā mea ʻē aʻe i hoʻohana ʻia ma lalo o ke ana wela kiʻekiʻe e hoʻohana ana i ka NPF625 a me NCF718 i kuhikuhi ʻia ma JIS G 4902 (papa superalloy pale i ka corrosion a me ka wela) e hoʻopaʻa i nā pakeneka nui. ʻOi aku ia ma mua o 50% o nā mea pipiʻi o Ni. Ma ka ʻaoʻao ʻē aʻe, no nā mea e like me ke kila kila i hoʻonui ʻia i ka ua e like me SUH660 e hoʻohana ana i nā hui intermetallic o Ti a me Al i kuhikuhi ʻia ma JIS G 4312 (papa kila pale wela), emi nui ka paʻakikī o 254 SMO ke hoʻohana ʻia no ka manawa lōʻihi ma nā mahana kiʻekiʻe, a ʻo ka hoʻohana ʻana a hiki i kahi 500°C ʻaʻole ia e hoʻokō i nā ʻano e pono ai no nā gaskets pale wela i hoʻolaha ʻia e ka mahana kiʻekiʻe i nā makahiki i hala iho nei.
Lama: 254SMO
Nā kūlana aupuni: 254SMO/F44 (UNS S31254/W.Nr.1.4547)
Nā hoa hana: Outokumpu, AVESTA, Hastelloy, SMC, ATI, Kelemānia, ThyssenKrupp VDM, Mannex, Nickel, Sandvik, Suedena Iapana Metallurgical, Nippon Steel a me nā hōʻailona kaulana ʻē aʻe
Lama ʻAmelika: UNS S31254
ʻIke holoʻokoʻa o 254SMo (S31254): He kila kila austenitic super. Ma muli o kona nui o ka molybdenum, he kiʻekiʻe loa kona kūpaʻa i ka pitting a me ka crevice corrosion. Ua hoʻomohala ʻia a hoʻomohala ʻia ke kila kila 254SMo no ka hoʻohana ʻana i nā wahi i loaʻa ka halide e like me ka wai kai.
ʻO ke kila kila kila nui he ʻano kila kila kūikawā. He ʻokoʻa ia mai ke kila kila maʻamau ma ke ʻano o ka hoʻohuihui kemika. Pili ia i ke kila kila kila kiʻekiʻe-alloy me ka nickel kiʻekiʻe, chromium kiʻekiʻe, a me ka molybdenum kiʻekiʻe. ʻO ke kila kila kila nui, ʻo ka nickel-based alloy he ʻano kila kila kūikawā, ʻo ka hoʻohuihui kemika mua he ʻokoʻa ia mai ke kila kila maʻamau, pili i ka nickel kiʻekiʻe me ka nickel kiʻekiʻe, chromium kiʻekiʻe, molybdenum kiʻekiʻe. ʻO ka mea maikaʻi loa he 254Mo, nona ka 6% Mo. He kūpaʻa maikaʻi loa kēia ʻano kila i ka corrosion kūloko. Loaʻa iā ia ke kūpaʻa maikaʻi i ka pitting corrosion ma lalo o ka wai kai, ka aeration, nā hakahaka, a me nā kūlana erosion haʻahaʻa wikiwiki (PI ≥ 40) a ʻoi aku ka maikaʻi o ke kūpaʻa ʻana i ka corrosion stress, nā mea ʻē aʻe no nā alloys Ni-based a me nā titanium alloys. ʻO ka lua, i ka hana kūpaʻa wela kiʻekiʻe a i ʻole ka corrosion, ʻoi aku ka maikaʻi o ke kūpaʻa i ke kūpaʻa wela kiʻekiʻe a i ʻole ka corrosion, ʻaʻole hiki ke hoʻololi ʻia ke kila kila 304. Eia kekahi, mai ka hoʻokaʻawale ʻana o ke kila kila kila, ʻo ke ʻano metallographic kila kila kila kūikawā he ʻano metallographic austenite paʻa. No ka mea he ʻano mea alloy kiʻekiʻe kēia kila kila kila kūikawā, he paʻakikī loa ia i ke kaʻina hana. Ma keʻano laulā, hiki i nā kānaka ke hilinaʻi wale i ke kaʻina hana kuʻuna e hana i kēia kila kila kila kūikawā, e like me ka ninini ʻana, ka forging, ka ʻōwili ʻana a pēlā aku.
I ka manawa like, loaʻa iā ia nā ʻano o ke kūpaʻa wela kiʻekiʻe e like me kēia:
1. Hōʻike ka nui o nā hoʻokolohua kahua a me ka ʻike nui ʻoiai ma nā mahana kiʻekiʻe iki, loaʻa i ka 254SMO ke kūpaʻa kiʻekiʻe i ka pala i loko o ka wai kai, a he kakaikahi wale nō nā ʻano kila kila i loaʻa kēia waiwai.
2. Hiki ke hoʻohālikelike ʻia ke kūpaʻa ʻana o 254SMO i ka pala i loko o nā hopena waikawa a me nā hopena halide oxidizing e like me nā mea e pono ai no ka hana ʻana i ka bleach pepa me nā mea hoʻohuihui nickel-base a me nā mea hoʻohuihui titanium i kūpaʻa loa i ka pala.
Ka manawa hoʻouna: ʻApelila-24-2018