309S Stainless hlau yog dab tsi? Kev sib xyaw, cov khoom siv thiab siab -Tsuas siv

309S Stainless hlau yog dab tsi?

309S yog austenitic stainless hlau nrog cov ntsiab lus chromium siab ntawm 22.0-24.0% thiab cov ntsiab lus npib tsib xee ntawm 12.0-15.0%, raws li UNS S30908 hauv qab ASTM A240 (phaj, ntawv thiab sawb). Cov ntsiab lus chromium siab muab nws zoo dua oxidation tsis kam ntawm qhov kub siab tshaj li 18-8 qib, thaum lub npib tsib xee khaws cov qauv austenitic kom cov khoom nyob twj ywm tawv, formable thiab weldable. S suffix txhais tau tias tsis tshua muaj carbon (0.08% siab tshaj), kev hloov kho ntawm thawj qib 309 uas txo qis carbide nag lossis daus thiab txhim kho weldability. 309S nyob hauv nruab nrab ntawm cov tsev neeg kub austenitic: ntau dua tshav kub-resistant dua 304, tab sis qis dua hauv chromium 310,010 (nickel). 24-26% Cr, 19-22% Ni).

Chemical Composition thiab Mechanical Properties

Tshuaj muaj pes tsawg leeg rau ASTM A240 (qhov hnyav feem pua)

Element	309S (NWS S30908)
Cov pa roj carbon (C)	Tsawg dua lossis sib npaug li 0.08
Manganese (Mn)	Tsawg dua lossis sib npaug li 2.00
Phosphorus (P)	Tsawg dua lossis sib npaug li 0.045
Sulfur (S)	Tsawg dua lossis sib npaug li 0.030
Silicon (Si)	Tsawg dua lossis sib npaug li 0.75
Chromium (Cr)	22.0 - 24.0
Nickel (Ni)	12.0 - 15.0

Mechanical zog nyob rau hauv lub annealed mob

Khoom	Tus nqi
Tensile zog, min (MPa)	515
Yield zog 0.2%, min (MPa)	205
Elongation, min (%)	40

Ua kom siab -Cwj pwm kub thiab kev siv

Yog vim li cas xaiv 309S yog qhov kub thiab txias. Hauv kev pabcuam oxidizing tas mus li, 22-24% chromium cov ntsiab lus tsim ib qho ruaj khov, ua raws li cov oxide nplai uas tiv thaiv cov hlau ntawm qhov kub thiab txias qhov twg 304 (18% Cr) yuav scale sai thiab poob seem . 309S yog li siv rau qhov cub qhov chaw, radiant tubes, burner Cheebtsam, cua sov- cov khoom sib xws hauv lub thawv, thiab cov khoom sib txawv petrochemical, fais fab thiab cua sov-cov nroj tsuag kho. Qhov qis-carbon S version tiv thaiv kev nkag siab zoo dua li tus qauv 309, uas tseem ceeb rau kev siv welded kub- kev pabcuam kev tsim kho. Rau qhov hnyav tshaj plaws - kub lub luag hauj lwm - tshwj xeeb tshaj yog cyclic cua sov thiab txias - 310S (UNS S31008) yog ib txwm escalation vim nws siab chromium thiab npib tsib xee cov ntsiab lus thiab zoo scale adhesion.

309vs309 ua

Qhov txawv yog carbon. Standard 309 (UNS S30900) tso cai rau 0.20% carbon, uas nce lub zog kub tab sis ua rau cov qib nquag chromium carbide nag lossis daus thaum vuam thiab nyob rau hauv 400-850℃kev pabcuam ntau yam. 309S txwv cov pa roj carbon monoxide rau 0.08% siab tshaj plaws, uas txo qis kev tiv thaiv carbide thiab txo qis kev ua haujlwm. intergranular corrosion nyob rau hauv welded los ua ke. Rau feem ntau fabricated kub- khoom siv, 309S yog nyiam; 309 tsis tshua tau teev hnub no tshwj tsis yog qhov yuav tsum tau muaj lub zog siab kub siab tshaj plaws thiab vuam tsis cuam tshuam.

Corrosion Resistance, Magnetism thiab txwv

Nyob rau hauv chav tsev kub 309S kuj muaj qhov zoo dav corrosion kuj vim nws cov ntsiab lus chromium siab, thiab nws tiv taus ntau oxidizing xov xwm. Nws cov kev txwv yuav tsum tau nkag siab: zoo li tag nrho 18-8 thiab 25{5}}12 tsev neeg qib tsis muaj molybdenum, nws muaj kev txwv tsis pub muaj cov tshuaj chloride pitting thiab tsis haum rau cov dej hiav txwv lossis cov tshuaj chloride muaj zog - rau cov dej num no molybdenum-cov qib kev xaiv xws li du plex. lossis qib 316L. Nyob rau hauv siab - qhov kub thiab txias kev pab cuam, 309S tiv taus sulfur{17}} muaj cov huab cua tsim nyog nyob rau hauv ntau qhov xwm txheej, tab sis carburizing cua yuav tsum raug zam vim tias chromium carbides tuaj yeem tsim thiab degrade cov hlau. Puas yog 309S sib nqus? Tsis yog. Nws yog austenitic thiab qhov tseem ceeb uas tsis yog-magnetic nyob rau hauv cov mob annealed; zoo li lwm cov qib austenitic nws tuaj yeem tsim cov hlau nplaum me ntsis tom qab ua haujlwm txias vim tias deformation tuaj yeem hloov ib feem ntawm cov qauv. Qhov no yog qhov qub thiab tsis qhia txog qhov teeb meem zoo. Yog tias muaj qhov yuav tsum tau ua kom tsis muaj hlau nplaum, cov khoom siv yuav tsum tau kuaj xyuas hauv cov txheej txheem annealed thiab los ntawm kev ntsuas magnetic permeability.

FAQ

Qhov txawv ntawm 309 thiab 309S yog dab tsi?

Cov ntsiab lus carbon . 309 tso cai txog 0.20% carbon; 309S txwv nws mus rau 0.08%. 309S tau zoo dua weldability thiab tsis kam rau carbide nag lossis daus, thiab yog cov version ib txwm teev hnub no.

Qhov kev pabcuam siab tshaj plaws ntawm 309S yog dab tsi?

309S yog siv hauv kev pabcuam oxidizing tas li ntawm qhov kub thiab txias qhov twg 304 tsis tuaj yeem siv; nyob rau hauv kev xyaum nws yog tsis tu ncua thov nyob ib ncig ntawm 1000℃nyob rau hauv oxidizing atmospheres, nrog rau lub caij nyoog txwv nyob rau hauv load, cua thiab tsim code. Rau lub luag haujlwm hnyav tshaj plaws, 310S raug pom zoo.

309S puas tuaj yeem welded?

Yog lawm. Nws yog welded nrog austenitic muab tub lim ntawm 309 lossis 310 hom, siv TIG, MIG lossis MMA cov txheej txheem. Preheating tsis tas yuav tsum tau; cov pa roj carbon tsawg ntawm 309S khaws cov cua sov ntawm vuam- thaj tsam cuam tshuam tsis muaj cov nag lossis daus loj carbide.

Puas yog 309S haum rau dej hiav txwv?

Tsis yog. Tsis muaj molybdenum, 309S muaj qhov txwv tsis pub muaj cov tshuaj chloride pitting thiab tsis haum rau cov dej hiav txwv lossis cov tshuaj chloride- cov kev pabcuam. Siv 316L lossis qib duplex rau cov cheeb tsam ntawd.

Puas yog 309S zoo ib yam li 310S?

Tsis yog. 310S (UNS S31008) muaj ntau dua chromium (24-26%) thiab npib tsib xee (19-22%), muab kev tiv thaiv oxidation zoo dua thiab nplai adhesion ntawm qhov kub siab tshaj qhov kev pab cuam . 309S yog cov qis-alloy, qis tus tswv cuab ntawm khub.

Dab tsi yog qhov sib npaug ntawm 309S?

309S sib raug rau UNS S30908 raws li ASTM A240; Qhov sib npaug EN 10088 yog 1.4833, thiab Japanese npe yog SUS309S raws li JIS G4304 / G4305.