Kev sib piv ntawm SUS304 thiab SUS309S: General-Lub Hom Phiaj vs High-Chromium High-Temperature Oxidation-Resistant Austenitic Stainless Steel

SUS304 thiab SUS309S yog austenitic stainless hlau nrog cov kev taw qhia sib txawv, nrog rau qhov sib txawv ntawm cov ntsiab lus chromium thiab npib tsib xee (SUS309S: Cr=22.00-24.00%, Ni=12.00-15.00%; SUS304: Cr=18.00-20.00%, Ni=8.00-10.50}%). Lub siab chromium-nickel cov ntsiab lus ntawm SUS309S ho txhim kho siab -kub oxidation kuj, ua rau lawv haum rau txawv kub thiab oxidation ib puag ncig yuav tsum tau.

Core Parameter Sib piv

Parameter	SUS304 Stainless hlau	SUS309S Stainless hlau
Chemical Composition (wt%)	C Tsawg dua lossis sib npaug 0.08, Si Less dua lossis sib npaug rau 1.00, Mn Tsawg dua lossis sib npaug 2.00, P Tsawg dua lossis sib npaug 0.045, S Less dua lossis sib npaug 0.030, Cr=18.00-20.00, Ni=8.00-10.50, Fe=Sib npaug	C Tsawg dua lossis sib npaug 0.08, Si Less dua lossis sib npaug rau 1.00, Mn Tsawg dua lossis sib npaug 2.00, P Tsawg dua lossis sib npaug 0.045, S Less dua lossis sib npaug 0.030, Cr=22.00-24.00, Ni=12.00-15.00, Fe=Sib npaug
Mechanical Properties (Annealed)	Tensile Strength Ntau dua los yog sib npaug rau 515MPa, Yield Strength Ntau dua lossis sib npaug rau 205MPa, Elongation Ntau dua lossis sib npaug li 40%, Hardness Tsawg dua lossis sib npaug rau 201HB	Tensile Strength Ntau dua los yog sib npaug rau 515MPa, Yield Strength Ntau dua lossis sib npaug rau 205MPa, Elongation Ntau dua lossis sib npaug li 40%, Hardness Tsawg dua lossis sib npaug rau 217HB
Kev Pabcuam Kub	-196℃txog 870℃(kev pabcuam txuas ntxiv)	-196℃txog 1050℃(kev pabcuam txuas ntxiv)
Qib sib npaug	EN 1.4301, UNS S30400, AISI 304	EN 1.4828, UNS S30908, AISI 309S

Qhov tseem ceeb ntawm kev ua tau zoo sib txawv: 1. High -kub oxidation tsis kam: SUS309S cov ntsiab lus siab chromium tsim cov Cr₂O₃ oxide zaj duab xis tuab ntawm qhov kub thiab txias, uas tuaj yeem tiv taus oxidation ntawm 1050 degree; SUS304's oxidation kuj tsis zoo siab tshaj 870 degree, thiab cov oxide zaj duab xis yog yooj yim tev tawm . 2. Corrosion kuj: SUS309S muaj zoo corrosion kuj nyob rau hauv siab - kub oxidizing cua (xws li siab - kub flue gas) dua SUS304; ob leeg muaj kev tiv thaiv corrosion zoo sib xws hauv chav-kub qis- ib puag ncig corrosion. 3. Lub zog: Ob leeg muaj chav zoo sib xws- qhov kub thiab txias, tab sis SUS309S muaj siab dua - qhov kub thiab txias . 4. Tus nqi: SUS309S yog 60-80%{201} ntau dua: SUS309S yog 60-80% Ob leeg muaj formability zoo, tab sis SUS309S cov ntsiab lus siab alloy nce deformation kuj me ntsis.

Siv tau Scenario Distinction: SUS304 yog haum rau nruab nrab -kub (tsawg dua lossis sib npaug li 870 degree) qis- cov khoom siv corrosion, xws li cov khoom siv ua zaub mov, cov kav dej zoo nkauj, thiab cov khoom siv hluav taws xob sab hauv tsev. SUS309S yog qhov tsim nyog rau siab -kub oxidation- cov khoom tiv thaiv, xws li cov khoom siv hluav taws xob, siab -cov kav dej kub hnyiab, cov khoom siv hluav taws xob kho cua sov, thiab boiler combustion chamber Cheebtsam (870-1050℃).

Tswv yim Q&A

Q1: Vim li cas SUS309S tuaj yeem siv ntawm 1050℃thaum SUS304 tsis tuaj yeem? A1: SUS309S's chromium content (22-24%) is 20% higher than SUS304, which can form a dense and stable chromium oxide film at high temperatures, preventing internal metal oxidation; SUS304's oxide zaj duab xis yog xoob thiab yooj yim tev tawm saum toj 870 degree, ua rau corrosion sai.

Q2: SUS309S puas tuaj yeem siv rau hauv siab -kub txo qhov cua? A2: Tsis yog. Nws tsuas yog haum rau siab -kub oxidizing cua; hauv kev txo cov huab cua (xws li hydrogen- roj nplua nuj), nws cov corrosion kuj tsis zoo; nws raug pom zoo kom siv nickel-raws li alloys rau siab -kub txo cua sov.

Q3: Cov khoom siv vuam siv li cas rau SUS309S? A3: Siv ER309L vuam hlau; tswj welding tshav kub input Tsawg dua los yog sib npaug rau 200J / mm kom tsis txhob grain coarsening; post-weld passivation kev kho yog pom zoo los txhim kho corrosion kuj; tsis muaj kev tshaj tawm -weld kev kho cua sov yog xav tau rau cov xwm txheej dav dav.

Q4: Dab tsi yog qhov kev pab cuam lub neej sib txawv ntawm SUS309S thiab SUS304 nyob rau hauv siab -kub rauv liners? A4: Nyob rau hauv 1000℃oxidizing huab cua, SUS309S lub neej kev pab cuam ntau dua los yog sib npaug rau 5 xyoo, thaum SUS304 lub neej kev pab cuam tsawg dua los yog sib npaug rau 6 lub hlis, uas tsis tuaj yeem ua tau raws li qhov ntev ntawm -cov kev pabcuam.

Q5: Yuav ua li cas xaiv ntawm SUS304 thiab SUS309S? A5: Xaiv SUS304 yog tias qhov kev pabcuam kub tsawg dua lossis sib npaug li 870℃thiab ib puag ncig qis -corrosion; xaiv SUS309S nkaus xwb yog tias qhov kev pabcuam kub yog 870-1050℃thiab kub-kub oxidation kuj yuav tsum tau, tsis hais tus nqi.