Puas yog 308 lossis 309 zoo dua rau Stainless rau Stainless Steel?

Thaum nws los txog rauvuam stainless hlau rau stainless hlau, ib qho ntawm cov lus nug feem ntau uas cov engineers thiab cov neeg tsim khoom nug yog:
Kuv puas yuav tsum siv 308 lossis 309 cov hlau nplaum?

Ob qho tib si 308 thiab 309 yogCov khoom siv filler austenitic stainless hlausiv dav hauv kev tsim thiab kho cov qauv hlau tsis xeb. Txawm li cas los xij, lawv ua haujlwm sib txawv nyob ntawm sebCov khoom siv hlau tseem ceeb, cov xwm txheej vuam, thiab ib puag ncig kev pabcuam.

Hauv tsab xov xwm ntxaws ntxaws no,SAKYSTEEL, ib lub tuam txhab tsim khoom thiab xa tawm hlau stainless thoob ntiaj teb, piav qhia txogqhov sib txawv ntawm 308 thiab 309 stainless filler hlau, lawv cov yam ntxwv tshuaj lom neeg thiab hlau, thiab qhov twg ua tau zoo dua rau kev siv vuam stainless-rau-stainless.

1. Kev Taw Qhia Txog 308 thiab 309 Stainless Steels

308 Cov Hlau Stainless

308 stainless hlau(UNS S30800) yog ib qhoaustenitic chromium-nickel alloytsim los rau kev vuamCov hlau tsis xeb 304 thiab 304LNws muaj nyob ib puag ncig20% chromiumthiab10% npib tsib xees, muab nws zoo heev corrosion tsis kam thiab zoo weldability.

Vim nws muaj cov khoom sib xws li 304, 308 filler yog qhovkev xaiv tus qauvthaum koom nrog 304 rau 304 lossis lwm yam 300-series stainless hlau hauv cov chaw tsis hnyav.

309 Cov Hlau Stainless

309 stainless hlau(UNS S30900) kuj yog ib qho austenitic chromium-nickel alloy, tab sis nws muajchromium siab dua (≈23%)thiabnpib tsib xee (≈13%)tshaj 308. Qhov no ua rau nws ntau duatsis kam rau oxidation, thermal qaug zog, thiab scaling ntawm qhov kub siab.

Chiv thawj tsim los ua ib qhoqib tiv taus kub, 309 tam sim no kuj siv ua ib qhokev hloov pauv hlaurau kev koom ua ke ntawm cov hlau tsis xeb sib txawv thiab rau kev vuam ntawm cov hlau tsis xeb thiab cov hlau carbon.

2. Cov Tshuaj Lom Zem

Cov tshuaj lom neeg ua rau txiav txim siab seb txhua lub hlau ua haujlwm li cas thaum lub sijhawm thiab tom qab vuam.

• 308 Cov Hlau Stainless Muaj pes tsawg leeg:

  • Chromium: 19–21%

  • Nickel: 9–11%

  • Cov pa roj carbon: ≤0.08%

  • Manganese: ≤2%

  • Silicon: ≤1%

• 309 Cov Hlau Stainless Muaj pes tsawg leeg:

  • Chromium: 22–24%

  • Nickel: 12–15%

  • Cov pa roj carbon: ≤0.08%

  • Manganese: ≤2%

  • Silicon: ≤1%

Qhov Txawv Tseem Ceeb:

muaj 309cov ntsiab lus alloy siab dua, txhim kho kev tiv thaiv raucua sov thiab oxidationtab sis ua nws me ntsiskim duatshaj 308.

3. Cov Qauv Me Me thiab Cov Yam Ntxwv ntawm Cov Hlau

Ob qho tib si 308 thiab 309 yogausteniticcov hlau tsis xeb, txhais tau tias lawv cov qauv siv lead ua yoglub ntsej muag-centered cubic (FCC)Qhov no ua rau lawv zoo heev ductility, toughness, thiab corrosion tsis kam.

Txawm li cas los xij, lawv covcov ntsiab lus ferritetom qab khov kho sib txawv:

• 308 weld hlau feem ntau muaj3–10% ferrite, uas txo qhov kub tawg.

• 309 weld hlau feem ntau muajcov ntsiab lus ferrite ntau dua(txog li 15%), txhim kho kev tiv thaiv kom tsis txhob tawg thaum muaj cua sov siab.

Yog li ntawd, 309 zoo dua rauvuam cov ntu tuab dua lossis cov ntaub ntawv nrog cov cua sov siab, qhov twg kev tawg yog qhov txhawj xeeb.

4. Kev Siv Vuam ntawm 308

308 hlau nplaumyog tus qauv kev lag luam rau kev vuamcov hlau tsis xeb austeniticxws li 304, 304L, thiab 301.

Cov Kev Siv Ib Txwm Muaj:

• Kev vuam304/304L txog 304/304L

• Kev tsim khoom ntawmcov thoob dej, cov kav dej, thiab cov khoom siv hauv tsev

• Cov khoom siv ua zaub mov thiab dej haus

• Cov ntawv thov architectural thiab decorative

308L (cov qauv carbon tsawg) feem ntau yog siv los tiv thaivcov dej nag los ntawm carbidethiab tswj kev tiv thaiv corrosion hauvcov pob qij txha uas tau weldedtsis muaj kev kho cua sov tom qab vuam.

Cov txiaj ntsig ntawm 308:

• Kev sib phim zoo heev rau 304 thiab cov hlau tsis xeb zoo sib xws

• Zoo nkauj weld tsos thiab yooj yim slag tshem tawm

• Tswj kev tiv thaiv corrosion hauv feem ntau qhov chaw ib puag ncig

Cov Kev Txwv:

• Tsis zoo tagnrho rau kev pabcuam kub siab tshaj 800 ° C

• Tsis haum rau kev txuas cov hlau tsis xeb rau cov hlau carbon

5. Kev Siv Vuam ntawm 309

309 hlau nplaumyog tsim los raucov ntsiab lus alloy siab duathiabkev sib raug zoo duatshaj 308.

Cov Kev Siv Ib Txwm Muaj:

• Kev vuamhlau tsis xeb rau cov hlau carbon lossis cov hlau tsis tshua muaj hlau

• Koom nrogcov hlau tsis sib xws(piv txwv li, 304 txog 310, lossis 316 txog 321)

• Kho cov vuam ntawm cov qib stainless hlau tsis paub

• Cov khoom kub siab xws licov khoom siv rau lub cub tawg, cov khoom hloov cua sov, thiab cov tshuab tso pa tawm

309 cov chromium thiab nickel ntau dua tso cai rau nwszam kev tsis sib haum xeeb ntawm cov qauvntawm cov hlau sib txawv yam tsis muaj kev tawg lossis xeb.

Cov txiaj ntsig ntawm 309:

• Zoo heev tsis kam rau oxidation thiab scaling txog li 1100 ° C

• Kev kam rau siab zoo rau cov hlau sib xyaw lossis tsis paub

• Txo qhov kev tawg thaum lub sijhawm vuam kub siab

Cov Kev Txwv:

• Kim dua me ntsis dua li 308

• Kev sib xyaw ua ke ntau dhau yuav txo qhov ductility rau cov ntawv vuam nyias nyias

6. Kev Tiv Thaiv Kev Xeb

Ob qib muab kev tiv thaiv xeb zoo heev, tab sis qhov chaw pabcuam txiav txim siab seb qhov twg ua haujlwm zoo dua.

• 308:Zoo kawg nkaus hauvCov huab cua thiab cov tshuaj lom neeg tsis muaj zog, zoo ib yam li 304 stainless.

• 309:Zoo tshaj plaws hauvoxidizing thiab kub ib puag ncig, ua siab ntev rau kev hloov pauv thermal yam tsis muaj scaling lossis carburization.

Raudej hiav txwv lossis cov chaw muaj chloride ntau, tsis yog 308 lossis 309 ua tau zoo li cov qib uas muaj molybdenum zoo li 316 lossis 317.

Txawm li cas los xij, raucov khoom siv cua sov hauv kev lag luam thiab cov pob qij txha hloov pauv, 309 ua tau zoo dua 308.

7. Kev Tiv Thaiv Kub Siab

Qhov no yog ib qho ntawm qhov sib txawv tseem ceeb tshaj plaws ntawm 308 thiab 309.

• 308:Ua haujlwm zoo mus txog870°C (1600°F)ua ntej poob lub zog thiab kev tiv thaiv oxidation.

• 309:Tswj kev ncaj ncees mus txog rau1100°C (2010°F), ua rau nws zoo tagnrho raulub cub tawg thiab cov pa tawm.

Yog li ntawd, yog tias qhov sib koom ua ke welded raug nthuav tawm rau hauvcua sov tas mus li lossis cyclic, 309 yog qhov kev xaiv zoo dua.

8. Cov Khoom Siv Kho Tshuab

Cov khoom siv kho tshuab ib txwm muaj rau ob qho hlau filler (qhov xwm txheej ntawm weld deposit):

• 308:

  • Lub zog tensile: ~ 550 MPa

  • Lub zog tawm los: ~ 350 MPa

  • Kev ntev: 35%

• 309:

  • Lub zog tensile: ~ 620 MPa

  • Lub zog tawm los: ~ 420 MPa

  • Kev ntev: 35%

Xaus lus:
309 welds muaj zog dua thiab tiv taus kev hloov pauv kub siab, thaum 308 welds muaj zog dua thiab yooj yim dua rau kev ua tiav rau kev zoo nkauj lossis kev siv huv.

9. Kev vuam thiab kev tsim khoom

Ob leeg 308 thiab 309 muajzoo heev weldabilitythiab siv tau nrog txhua yam txheej txheem uas siv tau -GTAW (TIG), GMAW (MIG), SMAW (Stick), and FCAW (Flux-Cored).

Txawm li cas los xij, xav txog cov hauv qab no:

• Siv308Lthaum vuam cov hlau tsis muaj steel uas tsis muaj carbon ntau kom tiv thaiv kev xeb intergranular.

• Siv309thaum koom ua ke cov hlau sib txawv lossis thaum tsis paub meej tias muaj pes tsawg lub hauv paus.

Yuav kom tsis txhob tawg,tswj cov cua sov nkagthiabtswj qhov kub ntawm qhov chaw hla mus rau hauv qab 150 ° C.

10. Cov Hlau Sib Xws

Ib txoj cai dav dav ntawm tus ntiv tes xoo: