Tsawg-Carbon Stainless hlau 309S

1. Dab tsi yog 309S Stainless Hlau?

309S yog qib qis- carbon qib ntawm hom 309 austenitic stainless hlau, tsim UNS S30908 thiab npog los ntawm ASTM A240 rau phaj, ntawv thiab sawb, thiab los ntawm EN 10088-2 raws li cov khoom siv 1.4833. Nws cov ntsiab lus chromium ntawm 22.00-24.00% thiab cov ntsiab lus nickel ntawm 12.00-15.00% tso nws zoo tshaj 304/316 tsev neeg, uas yog vim li cas 309S raug xaiv thaum cov khoom yuav tsum tiv thaiv oxidation thiab scaling ntawm kub txog li 980 C.

Tsab ntawv S qhia txog cov ntsiab lus carbon siab tshaj plaws ntawm 0.08%, piv nrog 0.20% rau cov qauv qib 309. Cov pa roj carbon tsawg tsawg txo qhov kev pheej hmoo ntawm chromium carbide nag lossis daus ntawm cov ciam teb thaum cov hlau tau rhuab hauv qhov ntsuas kub ntawm kwv yees li 425-900 C, piv txwv li thaum vuam lossis lub sijhawm ua haujlwm ntawm qhov nruab nrab.

2. Tshuaj muaj pes tsawg leeg (ASTM A240)

Cov lus hauv qab no muab cov kev txwv tshwj xeeb rau Hom 309S hauv ASTM A240. Hlau ua kom sib npaug.

Lub ntsiab	Limit (wt%)
Cov pa roj carbon (C)	0.08 max
Manganese (Mn)	max 2.00 Nws
Phosphorus (P)	0.045 max
Sulfur (S)	0.030 max
Silicon (Si)	0.75 max
Chromium (Cr)	22.00-24.00
Nickel (Ni)	12.00-15.00
Nitrogen (N)	0.10 max

3. Mechanical Properties (Annealed)

Nyob rau hauv cov mob annealed, Hom 309S phaj, daim ntawv thiab sawb yuav tsum tau los ntawm ASTM A240 kom tau raws li nram no yam tsawg kawg nkaus tus nqi.

Khoom	Yam tsawg kawg nkaus
Tensile zog	515 MPa ua
Yield zog (0.2% offset)	205 MPa
Elongation nyob rau hauv 50 mm	40 %

4. Thaum tshav kub kub tsis kam

309S resists scaling nyob rau hauv huab cua thaum lub sij hawm tas mus li kev pab cuam txog li 980 C thiab tuaj yeem zam qhov kub siab dua rau luv luv, tsis sib xws. Cov ntsiab lus siab chromium tsim ib qho chaw ruaj khov, ua raws li oxide zaj duab xis uas ua rau qeeb oxidation ntxiv. Rau ntev -lub sij hawm thauj khoom- bearing kev pab cuam saum toj no roughly 550 C, designers yuav tsum soj ntsuam tus cwj pwm creep; qhov twg qhov siab tshaj plaws creep zog yuav tsum tau, siab dua - carbon H qib feem ntau tau teev tseg.

5. Fabrication thiab hom kev siv

309S tuaj yeem tsim los ntawm cov pa dov, khoov thiab kos duab sib sib zog nqus. Nws yog weldable los ntawm cov txheej txheem xws li TIG, MIG thiab submerged arc vuam; preheating tsis yog ib txwm yuav tsum tau, thiab cov ntsiab lus ntawm cov pa roj carbon tsawg pab tswj kev ua haujlwm corrosion nyob rau hauv raws li -welded mob. Cov ntawv thov ib txwm muaj xws li:

Rauv qhov chaw, radiant tubes thiab muffles

Thaum tshav kub kub exchangers, recuperators thiab cua tso cua sov

Boiler Cheebtsam thiab superheater txhawb nqa

Kiln thiab qhov cub hauv ob sab phlu thiab fixtures

Cov khoom siv tshuaj ua haujlwm raug rau qhov kub siab

6. FAQ

Q1. Qhov txawv ntawm 309 thiab 309S yog dab tsi?

Cov ntsiab lus siab tshaj plaws yog 0.20% rau qib 309 thiab 0.08% rau 309S. Qhov qis dua -carbon version yog qhov zoo dua qhov uas cov vuam yog cuam tshuam thiab qhov twg intergranular corrosion kuj nyob rau hauv qhov kub thiab txias ntau yam teeb meem.

Q2. Qhov kev pabcuam siab tshaj plaws ntawm 309S yog dab tsi?

Rau oxidation tsis kam hauv huab cua, kev pabcuam txuas mus txog li 980 C feem ntau raug suav hais tias. Qhov twg cov khoom muaj kev ntxhov siab, qhov siab tshaj plaws tsim qhov kub thiab txias yog nyob ntawm creep zog.

Q3. Puas yog 309S sib nqus?

Tsis yog . 309S yog tag nrho austenitic nyob rau hauv cov mob annealed thiab yog qhov tseem ceeb tsis yog-sib nqus, txawm hais tias hnyav ua haujlwm txias tuaj yeem ua rau cov lus teb sib nqus me ntsis.

Q4. Cov qauv twg npog 309S?

ASTM A240 npog phaj, ntawv thiab sawb; ASTM A312 thiab A358 npog yeeb nkab; ASTM A213 npog me me - txoj kab uas hla; EN 10088-2 teev cov khoom sib npaug 1.4833.

Q5. 309S puas tuaj yeem welded rau 304 lossis 316 stainless hlau?

Tau. 309S feem ntau yog siv los ua cov khoom siv hloov pauv vim tias nws cov ntsiab lus alloy siab dua tuaj yeem ua rau muaj kev cuam tshuam los ntawm qis dua - alloyed hauv paus hlau, tab sis cov hlau muab tub lim yuav tsum tsim nyog los ntawm cov txheej txheem vuam, feem ntau yog 309-hom muab tub lim.