He aha ke kila e pale ai i ka wela kiʻekiʻe?
Nui nā ʻano kila, akā ʻaʻole like like kā lākou mau hana.
ʻO ka mea maʻamau, ke kuhikuhi nei mākou i ke kila wela kiʻekiʻe ma ke ʻano he "wela pale pale". ʻO ke kila pale wela e pili ana i kahi papa o nā kila i loaʻa ke kūpaʻa oxidation a ʻoluʻolu i ka ikaika wela kiʻekiʻe a me ke kūpaʻa wela maikaʻi loa ma lalo o nā kūlana wela kiʻekiʻe. Ua hoʻomaka ʻo Kina e hana i ke kila wela i ka makahiki 1952.
Hoʻohana pinepine ʻia ke kila wela i ka hana ʻana i nā ʻāpana e hana ana i nā wela kiʻekiʻe i loko o nā boilers, nā turbine mahu, nā mīkini mana, nā umu ʻoihana a me nā ʻoihana ʻoihana e like me ka mokulele a me nā ʻoihana petrochemical. Ma waho aʻe o ka ikaika wela kiʻekiʻe a me ke kūpaʻa ʻana i ka corrosion oxidative kiʻekiʻe, pono kēia mau ʻāpana i ke kūpaʻa ʻoluʻolu, ke kaʻina hana koʻikoʻi a me ka weldability, a me kekahi mau hoʻonohonoho hoʻonohonoho e like me nā hoʻohana like ʻole.
Hiki ke hoʻokaʻawale ʻia ke kila wela i ʻelua ʻano e like me kāna hana: ke kila anti-oxidation a me ke kila wela. Ua kapa ʻia ke kila anti-oxidation no ka pōkole. ʻO ke kila ikaika wela e pili ana i ke kila i loaʻa i ke kūpaʻa kūʻokoʻa koʻikoʻi i nā wela kiʻekiʻe a me ka ikaika wela kiʻekiʻe.
Hiki ke hoʻokaʻawale ʻia ke kila wela i ka austenitic heat-resistant steel, martensitic heat-resistant steel, ferritic heat-resistant steel a me pearlite heat-resistant steel e like me kona hoʻonohonoho maʻamau.
ʻO ke kila wela wela Austenitic ka nui o nā mea austenite constituent e like me nickel, manganese, a me ka nitrogen. Ke piʻi aʻe ma luna o 600 ℃, loaʻa iā ia ka ikaika kiʻekiʻe kiʻekiʻe a me ka hoʻonohonoho hoʻonohonoho paʻa, a he hana hoʻoheheʻe maikaʻi loa. Hoʻohana maʻamau ia ma luna o 600 ℃ ʻikepili wela o ka hana. Martensitic wela-pale kila maʻamau i ka chromium maʻiʻo o 7 a 13%, a he kiʻekiʻe wela ikaika, oxidation kū'ē a me ka wai mahu corrosion kū'ē ma lalo o 650 ° C, akā, kona weldability ua ilihune.
ʻO ke kila wela ferritic ka nui o nā mea e like me ka chromium, aluminika, silika, a me nā mea ʻē aʻe, e hana ana i kahi hoʻonohonoho ferrite hoʻokahi-phase, loaʻa ka mana koʻikoʻi e pale aku i ka oxidation a me ke kinoea kinoea wela kiʻekiʻe, akā he haʻahaʻa haʻahaʻa haʻahaʻa a ʻoi aku ka brittleness ma ka lumi wela. . , Weldability maikaʻi ʻole. ʻO ka pearlite heat-resistant steel alloy elements ka nui o ka chromium a me ka molybdenum, a ʻaʻole ʻoi aku ka nui o ka huina ma mua o 5%.
ʻAʻole ka palekana i ka pearlite, ferrite, a me ka bainite. ʻO kēia ʻano kila ka ikaika wela kiʻekiʻe a me ka hana kaʻina hana ma 500 ～ 600 ℃, a haʻahaʻa ke kumukūʻai.
Hoʻohana nui ia e hana i nā ʻāpana wela ma lalo o 600 ℃. E like me ka paila kila paipu, turbine impellers, rotors, fasteners, kiʻekiʻe-press ipu, paipu, etc.
Ka manawa hoʻouna: Jan-19-2020