Kev sib piv ntawm SUS304 thiab SUS309S: General-Lub Hom Phiaj vs High-Chromium High-Temperature Oxidation-Resistant Austenitic Stainless Steel
Dec 30, 2025
Tso lus
Txheej txheem cej luam: Ob tug Austenitic Workhorses
SUS304 (AISI 304, UNS S30400, EN 1.4301) yog cov khoom siv austenitic stainless hlau tshaj plaws hauv ntiaj teb. SUS309S (AISI 309S, UNS S30908, ze tshaj European tsim EN 1.4833) yog qib siab dua -alloy austenitic qib nrog kwv yees li 22-24% chromium thiab 12-15% npib tsib xee. Qhov ntxiv chromium thiab npib tsib xee muab SUS309S muaj txiaj ntsig zoo ua haujlwm rau siab -kub oxidation thiab scaling, uas yog ib qho tseem ceeb tshaj plaws vim li cas xaiv nws tshaj SUS304. Rau lub hom phiaj dav dav, chav ntsuas kub thiab cov ntawv siv corrosive me me, SUS304 tseem yog qhov pheej yig dua.
Kev sib piv tshuaj lom neeg
Qhov kev lees paub muaj nyob hauv qab no ua raws JIS G4304 rau kub- dov stainless phaj, ntawv thiab sawb; ASTM A240 teeb tsa qhov tseem ceeb tib yam txwv rau UNS sib npaug.
| Element | SUS304 (JIS G4304) | SUS309S (JIS G4304) |
|---|---|---|
| Cov pa roj carbon (C) | Tsawg dua lossis sib npaug li 0.08% | Tsawg dua lossis sib npaug li 0.08% |
| Silicon (Si) | Tsawg dua lossis sib npaug li 1.00% | Tsawg dua lossis sib npaug li 1.00% |
| Manganese (Mn) | Tsawg dua lossis sib npaug li 2.00% | Tsawg dua lossis sib npaug li 2.00% |
| Phosphorus (P) | Tsawg dua lossis sib npaug li 0.045% | Tsawg dua lossis sib npaug li 0.045% |
| Sulfur (S) | Tsawg dua lossis sib npaug li 0.030% | Tsawg dua lossis sib npaug li 0.030% |
| Chromium (Cr) | 18.00-20.00% | 22.00-24.00% |
| Nickel (Ni) | 8.00-10.50% | 12.00-15.00% |
Mechanical Properties Sib piv
Nyob rau hauv cov xwm txheej annealed ob qib muaj qhov zoo sib xws hauv chav- qhov kub thiab txias, thiab ob qho tib si nyob twj ywm tag nrho austenitic thiab tsis yog- sib nqus tom qab cov tshuaj annealing. Cov lus teev qhov tsawg kawg nkaus lav qhov tseem ceeb rau phaj ib ASTM A240.
| Property (ntxiv) | UNS S30400 | UNS S30908 |
|---|---|---|
| 0.2% pov thawj kev nyuaj siab Rp0.2 | Ntau dua lossis sib npaug li 205 MPa | Ntau dua lossis sib npaug li 205 MPa |
| Tensile zog Rm | Ntau dua lossis sib npaug li 515 MPa | Ntau dua lossis sib npaug li 515 MPa |
| Elongation (2 nti) | Ntau dua lossis sib npaug li 40% | Ntau dua lossis sib npaug li 40% |
| Hardness | Tsawg dua lossis sib npaug rau 201 HBW | Tsawg dua lossis sib npaug rau 217 HBW |
High -Tsub Kev Ua Haujlwm
Oxidation kuj yog qhov twg ob qib sib txawv. SUS304 tuaj yeem siv rau kev pabcuam txuas ntxiv mus txog li 870℃thiab kev pabcuam sib cuam tshuam txog li 925 degree, tab sis rov ua dua nyob rau hauv 425-860℃ntau tuaj yeem ua rau chromium{11}}carbide nag lossis daus ntawm cov ciam teb, uas txo qis corrosion kuj. SUS309S thawb cov kev pabcuam txuas mus rau kwv yees li 1050℃thiab cuam tshuam txog li 1095 degree, vim tias nws cov ntsiab lus chromium siab dua ua rau muaj kev tiv thaiv oxide ntau dua. Rau qhov cub tawg, cov raj xa hluav taws xob, cov khoom siv kho cua sov, cov thawv ntim thiab cov pa tawm, SUS309S yog qhov kev xaiv zoo dua.
Kev Taw Qhia Xaiv
Xaiv SUS304 thaum qhov kev khiav hauj lwm kub nyob qis dua 400℃thiab ib puag ncig me me corrosive: khoom noj khoom haus, khoom siv hauv chav ua noj, architectural trim, tso tsheb hlau luam, piping thiab fabrication. Xaiv SUS309S thaum qhov chaw pom qhov ntsuas kub siab tshaj 500 degree, cua sov cua sov, lossis qhov kev pheej hmoo ntawm kev ntsuas cua hauv huab cua: cov khoom siv hluav taws xob, cov khoom siv boiler, cov khoom siv hluav taws xob, cov kav dej thermocouple thiab cov khoom siv vuam siv rau cov pob qij txha sib txawv. Yog tias ob qho tib si siab - qhov kub thiab txias yuav tsum tau ua kom muaj zog, lossis yog tias huab cua yog sulphidising, tag nrho austenitic cua sov- qib tiv taus nrog ntau dua nickel xws li UNS S31008 kuj yuav tsum tau soj ntsuam.
FAQ
Puas yog SUS309S muaj zog dua SUS304?
Nyob rau hauv chav tsev kub qhov guaranteed lub zog ntawm ob qib yog ze li ntawm zoo tib yam. Qhov sib txawv tiag tiag tshwm sim ntawm qhov kub siab, qhov twg SUS309S khaws nws cov nplai oxide thiab cov neeg kho tshuab kev ncaj ncees ntev dua SUS304.
Dab tsi yog EN sib npaug ntawm SUS309S?
Qhov ze tshaj plaws nyob sab Europe xaiv yog EN 1.4833 (X12CrNi23-13), uas phim 22-24% chromium thiab 12-15% nickel ntau ntawm AISI 309S. SUS309S yog JIS lub npe; UNS S30908 yog lub npe ASTM.
SUS304 puas tuaj yeem siv rau qhov cub tawg?
Tsuas yog qis dua li ntawm 870℃txuas ntxiv, thiab nrog kev paub txog kev txaus ntshai ntawm 425℃thiab 860℃. Rau qhov kev pab cuam lub cub tawg, SUS309S lossis siab dua- qib siab yog pom zoo.
Puas yog SUS304 thiab SUS309S sib nqus?
Ob leeg yog austenitic thiab qhov tseem ceeb tsis yog -magnetic tom qab cov tshuaj annealing. Lub teeb hlau nplaum tuaj yeem tshwm sim hauv zos tom qab hnyav ua haujlwm txias lossis vuam, tab sis qhov no tsis cuam tshuam rau kev ua haujlwm.
Puas yog SUS309S kim dua SUS304?
Yog lawm. Qhov siab dua chromium thiab nickel cov ntsiab lus ua rau SUS309S noticeably kim dua, yog li nws yuav tsum tau teev tsuas yog qhov twg nws qhov kub kom zoo dua qhov xav tau tiag tiag.
SUS309S puas tuaj yeem hloov SUS310S?
Tsis nyob ntawm qhov kev pabcuam siab tshaj plaws. SUS310S (UNS S31008) muaj li ntawm 25% chromium thiab 20% npib tsib xee thiab tuav txawm tias kub dua. SUS309S yog theem nrab ntawm SUS304 thiab SUS310S.
Xa kev nug