309 vs 310S Stainless hlau: Xaiv High-Tub kub Oxidation Resistant Alloys

 

Dab tsi yog cov tshuaj muaj pes tsawg leeg, siab -kub muaj peev xwm, thiab kev siv thawj zaug ntawm 309 thiab 310S?
Qib 309 feem ntau muaj 22-24% chromium thiab 12{19}}15% npib tsib xee. Qib 310S (qhov qis-carbon version ntawm 310) muaj 24-26% chromium thiab 19-22% npib tsib xee. Cov ntsiab lus alloy siab dua ntawm 310S tso cai rau nws tsim kom muaj kev ruaj khov thiab tiv thaiv chromium oxide nplai. 309 feem ntau haum rau kev pabcuam txuas mus txog li 1050 ° C (1922 ° F), thaum 310S tuaj yeem siv txuas ntxiv mus txog kwv yees li 1150 ° C (2102 ° F) hauv oxidizing atmospheres{17} feem ntau siv rau cov khoom siv hluav taws xob retorts, thiab kho cua sov fixtures. 310S tau teev tseg rau cov ntawv thov ntau dua xws li radiant burner tubes, reformer tubes nyob rau hauv petrochemical nroj tsuag, thiab high-temperature kiln Cheebtsam.

Qhov kev ua tau zoo sib txawv li cas rau kev xaiv rau cov khoom siv hluav taws xob tshwj xeeb?
Xaiv 309 rau cov khoom siv nyob rau hauv cov xwm txheej hnyav, xws li lub tshuab hluav taws xob hluav taws xob, cov khoom siv hluav taws xob, thiab cov khoom siv kho cua sov uas muaj qhov kub thiab txias tab sis feem ntau nyob hauv qab 1100 ° C. Nws yog tus nqi -kev xaiv zoo rau ntau daim ntawv thov cua sov. Xaiv 310S rau thaj chaw tseem ceeb tshaj plaws thiab kub tshaj plaws, xws li lub tshuab hluav taws xob, lub tshuab hluav taws xob hluav taws xob, siab -kub kub calciner sab hauv, thiab qhov chaw ncaj qha raug nplaim taws los yog carburizing cua. Rau lub sijhawm ntev - kev ntseeg siab nyob rau hauv cov xwm txheej hnyav, kev nqis peev hauv 310S yog qhov ncaj ncees.

Dab tsi yog fabrication txawv ntawm ob qhov zoo sib xws high -kub alloys?
Ob lub alloys muaj kev ua haujlwm siab- cov nqi hardening thiab xav tau ntau lub zog rau kev tsim thiab machining dua li cov qauv qib. Vuam yog ncaj nraim siv cov hlau sib txuam (ER309 rau 309, ER310 rau 310S). Ib kauj ruam tseem ceeb rau ob qho tib si yog tom qab-weld tov annealing, uas dissolves lwm yam chromium carbides uas tej zaum yuav tau tsim thiab restores zoo corrosion thiab kub kuj. Vim lawv cov thermal expansion siab, cov nyiaj pub rau kev nthuav dav thiab kev cog lus yuav tsum tau tsim rau hauv ib qho kev sib dhos.

Los ntawm kev xav txog tus nqi, thaum twg nws yog qhov tseem ceeb los qhia qhov kim 310S?
Nws yog ib qho tseem ceeb los qhia 310S thaum qhov kev ua haujlwm tsis tu ncua siab tshaj qhov kev nyab xeeb ntawm 309, lossis thaum huab cua muaj zog carburizing lossis muaj cov sulfur compounds. Yog hais tias ib qho khoom ua los ntawm 309 tau ua tsis tiav ntxov vim qhov kev ntsuas ntau dhau, kev hloov pauv, lossis kev hloov pauv, kev hloov kho mus rau 310S yog qhov kev xav tau. Rau cov khoom siv tshiab tsim los ua haujlwm ntawm cov kev txwv siab ntawm cov hlau tsis muaj peev xwm, kev qhia 310S los ntawm qhov pib ua kom ruaj khov thiab zam tsis tau cov nqi poob qis rau kev hloov pauv.

Cov lus qhia kawg dab tsi yuav tsum yog tus tsim lub tshuab hluav taws xob lossis tus kws kho tsheb ua raws?
Ib txwm pib xaiv cov khoom siv ntawm qhov siab tshaj plawstsis tu ncuakev khiav hauj lwm kub, tsis yog lub ncov los yog intermittent kub. Nrog rau cov kab kos cua sov cua sov thiab cov ntaub ntawv xa khoom. Yog tias qhov kub siab tshaj 1100 ° C hauv qhov chaw oxidizing, 310S yog qhov kev xaiv ua ntej. Rau qhov kub ntawm 950-1100 ° C, 309 tej zaum yuav txaus, tab sis xav txog 310S rau kev pab cuam lub neej ntev lossis yog tias huab cua hloov pauv. Sau cov ntsiab lus xaiv nrog rau cov ntaub ntawv ntsuas kub thiab huab cua.