Austenitic 304 Stainless Hlau Tus Nqi -Kev Ua Tau Zoo

Hom 304 yog qhov siv ntau tshaj plaws austenitic stainless hlau nyob rau hauv lub ntiaj teb no, thiab yog vim li cas yog tus nqi -effectiveness: nws muab ib tug sib npaug ntawm corrosion kuj, formability, weldability thiab toughness ntawm tus nqi qis alloy ntau dua li molybdenum- cov qib bearing. Tsim UNS S30400 hauv Tebchaws Meskas, 1.4301 hauv EN 10088, SUS304 hauv JIS, thiab 06Cr19Ni10 hauv GB / T 20878, 304 yog cov lus teb ua haujlwm ua haujlwm nyob rau txhua qhov chaw uas yuav tsum tau muaj nyob rau hauv ib qho chaw me me mus rau nruab nrab corrosive ib puag ncig.

Tshuaj muaj pes tsawg leeg ntawm 304 (ASTM A240)

Cov kev txwv hauv qab no yog coj los ntawm ASTM A240, uas npog phaj, ntawv thiab sawb ntawm Hom 304:

Element	304 (UNS S30400) wt%
Cov pa roj carbon (C)	0.08 max
Silicon (Si)	0.75 max
Manganese (Mn)	max 2.00 Nws
Phosphorus (P)	0.045 max
Sulfur (S)	0.030 max
Chromium (Cr)	18.00-20.00
Nickel (Ni)	8.00-10.50
Hlau (Fe)	Tshuav

18% chromium muab cov yeeb yaj kiab tiv thaiv kev tiv thaiv, thiab 8-10.5% npib tsib xee stabilizes austenitic qauv, uas muab cov alloy nws zoo heev sib sib zog nqus-kos duab thiab vuam cwj pwm.

Mechanical Properties of Annealed 304

Raws li ASTM A240, annealed Hom 304 phaj, ntawv thiab sawb yuav tsum tau raws li qhov tsawg kawg nkaus hauv qab no:

Khoom	Yam tsawg kawg nkaus
Tensile zog	515 MPa ua
Yield zog (0.2% offset)	205 MPa
Elongation	40%
Hardness	201 HWB max

Typical density is 7.93 g/cm3 and the modulus of elasticity is about 193 GPa, values ​​useful for weight and stiffness calculations in structural design.

Yog vim li cas 304 Yog Tus Nqi -Qhov Zoo Tshaj Plaws nrog Qib Siab dua -Alloy Qib

304 tsis muaj molybdenum, qhov kim tshaj plaws alloying ntxiv hauv stainless hlau. Qib xws li 316 (UNS S31600) ntxiv 2.00-3.00% molybdenum tshwj xeeb los tiv thaiv cov tshuaj chloride pitting, thiab lawv cov nqi yog siab dua. Rau feem ntau ntawm cov ntawv thov, dej tshiab, khoom noj, huab cua qhuav, tshuaj me me thiab cov cua hauv tsev, 304 muab tag nrho cov kev tiv thaiv corrosion uas xav tau, yog li them nyiaj rau molybdenum ntxiv tus nqi yam tsis muaj nqi ntxiv. Kev lag luam ntawm 304 txuas ntxiv tshaj li cov khoom siv: nws cov formability txo cov nqi tsim khoom, nws cov weldability txo cov nqi tsim khoom, thiab nws cov khoom siv dav ua rau lub sij hawm txhuas. Txoj cai kev txiav txim siab engineering yog qhov yooj yim: siv 304 tshwj tsis yog qhov chaw pabcuam muaj cov tshuaj chlorides, muaj zog acids lossis kub uas xav tau qib cua sov.

Kev Pab Cuam Kub Kub

304 yog qhov tsim nyog rau kev pabcuam txuas mus txog li 870℃hauv oxidizing cua thiab rau luv luv cuam tshuam txog li 925 degree. Hauv qab xoom, cov qauv austenitic khaws cov tawv tawv mus rau qhov kub thiab txias, uas yog vim li cas 304 yog siv rau cov kav dej cryogenic thiab khoom siv. Ob qhov kev ceeb toom siv: saum toj 870℃oxide zaj duab xis destabilizes thiab scaling accelerates, thiab nyob rau hauv lub 425-870℃ntau ntev raug yuav ua rau chromium carbide nag lossis daus ntawm grain ciam teb, uas txo corrosion kuj nyob rau hauv welded qhov chaw. Qhov twg qhov kev nkag siab zoo li no, qhov qis- carbon qib 304L yog qhov nyiam; qhov twg high-temperature zog yog qhov tseem ceeb, 304H yog teev.

Kev lag luam thiab kev siv

304 tshwm nyob rau hauv cov khoom noj khoom haus xws li tso tsheb hlau luam, conveyors, tableware thiab canning machinery; architectural panels, handrails thiab elevator interiors; dej sab hauv tsev- muab cov kav dej; tshuaj cia thiab thauj cov hlab ntsha rau dilute media; tsis yog-cov cuab yeej kho mob tsis muaj chaw nyob; thiab cov tshuab dav dav hauv qhov qis -corrosion ib puag ncig. Nws yog tsim nyob rau hauv txhua daim ntawv ntawm cov khoom, los ntawm daim ntawv, phaj, sawb thiab coil mus rau bar, hlau, yeeb nkab, raj thiab fittings, uas ua rau nws yooj yim rau qhov chaw rau yuav luag txhua qhov project.

FAQ

Q1: 304 stainless hlau puas tuaj yeem siv rau hauv cov chaw ntug dej hiav txwv?
A1: Nws tsis pom zoo rau qhov ntev - kev pabcuam sab nraum zoov uas tsis muaj kev tiv thaiv. Cov tshuaj chloride siab ua rau pitting, tshwj xeeb tshaj yog nyob rau hauv weld tshav kub- thaj chaw cuam tshuam, thiab lub neej kev pab cuam nyob rau hauv cov xwm txheej no feem ntau luv dua li ntawm 316. Rau cov ntawv siv ntug hiav txwv, qhia cov molybdenum- qib bearing.

Q2: Cov khoom siv vuam zoo li cas rau 304?
A2: ER308L hlau lossis E308L electrodes yog tus qauv. Cov ntsiab lus qis carbon ntawm cov muab tub lim tiv thaiv cov vuam los ntawm kev nkag siab, thiab cov khoom siv hluav taws xob yuav tsum tau tswj kom tsis txhob muaj cov qoob loo ntau dhau. Cov ntu tuab tuaj yeem tau txais txiaj ntsig los ntawm kev tshaj tawm -weld annealing ntawm 850-900℃los txo kev ntxhov siab.

Q3: Qhov kev pabcuam siab tshaj plaws ntawm 304 yog dab tsi?
A3: Kev pabcuam tsis tu ncua yog qhov ua tau zoo txog li 870 degree, nrog luv luv luv luv txog li 925 degree. Tshaj li cov kev txwv no, oxide zaj duab xis yuav tsis ruaj khov, thiab cov cua sov- cov qib tiv taus xws li 309S lossis 310S yuav tsum raug xaiv.

Q4: Puas yog 304 stainless hlau hlau nplaum?
A4: Annealed 304 yog qhov tseem ceeb tsis yog-sib nqus vim tias theem austenitic tsis yog- hlau nplaum. Kev ua haujlwm txias hloov qee qhov austenite mus rau martensite thiab ua kom cov hlau nplaum nce ntxiv; annealing ntawm 1050-1100℃tom qab los ntawm kev ua kom txias ceev rov qab los ntawm qhov tsis sib nqus.

Q5: Yuav ua li cas thiaj li 304 txawv ntawm carbon hlau?
A5: Kev kuaj xyuas ib txwm: 304 muaj qhov ci ntsa iab thiab hnov ​​​​mob maj mam lossis tsis tag rau cov tshuaj tiv thaiv stainless, thaum carbon hlau tig liab sai; annealed 304 tsuas yog tsis muaj zog hlau nplaum thaum cov hlau tsis muaj zog sib nqus; thiab 304 hnyav dua me ntsis (7.93 piv rau 7.85 g / cm3). Tshuaj ntsuam xyuas tseem yog txoj kev tseeb.