Hoʻolauna

I loko o ke ao koi o nā paipu ʻoihana, kahi i maʻamau ai nā mahana kiʻekiʻe a me nā wahi ʻino, he mea nui ke koho ʻana i nā mea. Ma waena o nā kila hui chromium-molybdenum (Cr-Mo) like ʻole, kū ka P9 ma ke ʻano he mea hilinaʻi a kūikawā i hoʻolālā ʻia no ka lawelawe wela kiʻekiʻe. ʻO ka Paipu Kila Alloy P9 kahi kihi i nā noi mai ka hana mana a hiki i ka hoʻomaʻemaʻe ʻaila, i mahalo ʻia no kona hui kūikawā o ka ikaika, ke kū'ē ʻana i ka oxidation, a me ke kūpaʻa microstructural.

He aha ka meaPaipu kila kila P9?

ʻO ka paipu P9 kahi inoa mai ka ASTM (American Society for Testing and Materials)A335 maʻamau, kahi e uhi ana i ka paipu hao hao ferritic seamless no ka lawelawe wela kiʻekiʻe. Hōʻike ka "P" i ka paipu, a ʻo "9" e pili ana i kona ʻano kemika kikoʻī, kahi i kikowaena ʻia a puni 9% chromium a me 1% molybdenum. ʻO kēia kemika kikoʻī ke kī i kāna hana.

Nā ʻano koʻikoʻi a me ka hoʻonohonoho ʻana

Nā waiwai oPaipu kila P9ua loaʻa mai kona mau mea hoʻohuihui pololei:

•Chromium (Cr ~9%): ʻO kēia ka mea nui e hāʻawi ana i ke kūpaʻa i ka oxidation (scaling) a me ka corrosion, ʻoi aku hoʻi i nā wahi e loaʻa ana ka sulfur. Hoʻokumu ia i kahi papa chromium oxide paʻa a pale ma luna o ka ʻili o ke kila.

•Molybdenum (Mo ~1%): Hoʻonui nui ka Molybdenum i ka ikaika o ke kila i nā mahana kiʻekiʻe. Kōkua ia i ka pale ʻana i ka kolo ʻana, kahi loli lohi a mau o ka mea ma lalo o ke kaumaha mau i nā mahana kiʻekiʻe.

Hāʻawi kēia ʻano hana i nā paipu P9 i kekahi mau pono koʻikoʻi:

•Ikaika Mahana Kiʻekiʻe Loa: Mālama ʻo P9 i kona kūpaʻa mechanical a me ka hiki ke halihali i nā mahana a hiki i 1100°F (593°C), e kūpono ana no nā laina mahu a me nā laina hana kiʻekiʻe.

•Ke Kū'ē ʻOkika Maikaʻi: Hāʻawi ka ʻike 9% chromium i kahi hoʻomaikaʻi nui i ke kū'ē ʻokika i hoʻohālikelike ʻia me nā kila metala haʻahaʻa e like me P11 a i ʻole P22.

•Ka ikaika o ka creep rupture i hoʻonui ʻia: ʻO kona hiki ke kū i ka hōʻike lōʻihi ʻana i ke kaumaha kiʻekiʻe a me ka mahana me ka ʻole o ka hāʻule ʻana he kumu nui ia no kona hoʻohana ʻia ʻana i nā noi koʻikoʻi.

•Paʻa Microstructural: Ua hoʻolālā ʻia ka hui e pale aku i ka hoʻokumu ʻia ʻana o nā ʻāpana makemake ʻole e hiki ke hoʻopili i ke kila i ka hala ʻana o ka manawa i ka wā o ka lawelawe wela kiʻekiʻe.

Nā Hoʻohana Maʻamau

Hoʻohana nui ʻia nā paipu kila P9 Alloy Steel i nā ʻoihana kahi i lilo ai nā mahana kiʻekiʻe i mea mau:

•Hana Mana: Nā paipu superheater a me nā paipu reheater, nā laina mahu nui, a me nā ʻōnaehana paipu wela kiʻekiʻe ʻē aʻe i loko o nā hale hana mana wahie fossil.

•Petrochemical a me ka Hoʻomaʻemaʻe ʻana: Nā laina hoʻoili i loko o nā hale hoʻomaʻemaʻe, nā paipu hoʻomehana, a me nā paipu no nā kaʻina hana e pili ana i nā hydrocarbons wela kiʻekiʻe.

•Ka Hana Kemika: No ka lawe ʻana i nā kahawai hana ma nā mahana kiʻekiʻe kahi e pono ai ke kūpaʻa i ka pala.

Nā Pōmaikaʻi ma luna o nā Alloys ʻē aʻe

ʻOiai he nui nā mea hoʻohuihui Cr-Mo, noho ʻo P9 i kahi niche kikoʻī. Hāʻawi ia i ke kūpaʻa oxidation maikaʻi a me ka ikaika kiʻekiʻe ma mua o ka mea hoʻohuihui 2.25% Cr (P22) maʻamau, me ka ʻole o ke kumukūʻai kiʻekiʻe a me ka paʻakikī o ka hoʻopili ʻana o ka ʻohana 9-12% Cr (P91). ʻO kēia ka mea e lilo ai ʻo P9 i koho kūpono a kūpono hoʻi no nā noi wela waena he nui.

Hopena

ʻO ka Alloy Steel Pipe P9 kahi mea i hōʻoia ʻia a pono loa no nā ʻenekinia e hoʻolālā ana i nā ʻōnaehana paipu wela kiʻekiʻe. ʻO kona ʻano kaulike o 9% chromium a me 1% molybdenum e hāʻawi i kahi hui kūpono o ka ikaika, ke kūpaʻa oxidation, a me ke kūpaʻa. No nā noi kahi i hiki ʻole ai ke kūkākūkā ʻia ka hilinaʻi ma lalo o ke kaumaha wela, ke hoʻomau nei ʻo P9 i kahi hopena hilinaʻi a hana kiʻekiʻe.