SUS316L Stainless hlau (UNS S31603): Tsawg-Carbon Austenitic Qib rau Corrosive Service

Qib Txheej txheem cej luam thiab kev sib npaug thoob ntiaj teb

SUS316L yog JIS lub npe rau qis-carbon molybdenum-cov kabmob austenitic stainless hlau UNS S31603. Nws cov ntsiab lus carbon yog txwv rau 0.03% siab tshaj plaws, uas txwv tsis pub chromium carbide nag lossis daus ntawm cov ciam teb thaum lub sij hawm vuam thiab nce siab - qhov kub thiab txias. Raws li qhov tshwm sim, SUS316L feem ntau tuaj yeem siv tau raws li -welded mob yam tsis muaj kev tshaj tawm -weld annealing, txawm nyob rau hauv qhov hnyav. Tib qib yog tsim los ntawm 316L hauv ASTM specifications thiab 1.4404 hauv EN system, thiab nws yog ib qho ntawm cov khoom siv dav dav tshaj plaws rau kev pabcuam corrosive.

Qhov system npe	Qib npe	Kev siv tus qauv
JIS	SUS 316L	JIS G4303, G4304
UNS	S31603	ASTM A240, A312, A213, A269
ASTM	316L	ASTM A240, A312, A213, A269
EN	1.4404 (X2CrNiMo17-12-2)	TS EN 10088

Tshuaj muaj pes tsawg leeg

Cov kab hauv qab no qhia txog JIS G4304 cov cai rau SUS316L. Qhov tseem ceeb tshaj plaws tswj yog 0.03% siab tshaj carbon, uas txhais tau tias L qib. ASTM A240 rau UNS S31603 tso cai nickel ntawm 10.0-14.0% thiab silicon ntawm 0.75% siab tshaj plaws; lwm qhov sib txawv yog sib xws ntawm ob lub tshuab.

Element	C	Si	Mn	P	S	Cr	Ni	Mo
Txwv,%	0.030 max	max 1.00 Nws	max 2.00 Nws	0.045 max	0.030 max	16.0-18.0	12.0-15.0	2.0-3.0

Qhov sib ntxiv ntawm molybdenum ntawm 2-3% yog qhov txawv ntawm 304L. Molybdenum ntxiv dag zog rau cov zaj duab xis passive thiab ua kom muaj zog tiv thaiv pitting thiab crevice corrosion hauv chloride-muaj cov xov xwm, nrog rau kev tiv thaiv rau dilute txo acids.

Mechanical Properties

Chav tsev yam tsawg kawg nkaus - qhov kub thiab txias rau phaj yog muab hauv JIS G4304 thiab ASTM A240 raws li hauv qab no.

Khoom	JIS G4304	ASTM A 240 Cov Lus Qhia
Tensile zog, MPa	480 min	485 nqi
0.2% pov thawj / tawm lub zog, MPa	175 feeb	170 feeb
Elongation,%	40 feeb	40 feeb
Hardness	187 HWB max	217 HWB max

Corrosion Resistance thiab Service txwv

Qhov twg SUS316L ua tau zoo

SUS316L tiv taus pitting thiab crevice corrosion nyob rau hauv chloride- bearing dej thiab cua nyob deb tshaj 304L, thiab nws ua tau zoo nyob rau hauv dilute sulfuric thiab phosphoric acids, organic acids, zaub mov acids thiab feem ntau nruab nrab ntsev tov. Cov ntsiab lus carbon tsawg ua kom sov- thaj tsam cuam tshuam ntawm welds tsis muaj kev nkag siab, uas yog vim li cas qib dominates welded tshuaj thiab khoom noj khoom haus.

Kev txwv ib puag ncig

Kub concentrated chlorides, muaj zog txo cov kua qaub xws li kub hydrochloric acid, thiab dej hiav txwv ntawm qhov kub siab tseem tuaj yeem ua rau pitting, crevice nres lossis kev ntxhov siab corrosion tawg. Rau cov kev pabcuam zoo li no, cov kws ua haujlwm tau hais qhia ntau dua -molybdenum alloys xws li 6% molybdenum super-austenitic UNS S31254 lossis npib tsib xee-raws li cov alloys xws li UNS N10276, uas muab cov txiaj ntsig zoo corrosion tshaj 316L.

Vuam thiab Fabrication

SUS316L yog weldable los ntawm txhua tus txheej txheem txheej txheem suav nrog TIG, MIG, MMA thiab SAW. Cov ntsiab lus tsis tshua muaj carbon tsis txhob hnov ​​​​qab, yog li kev tshaj tawm -weld kev kho cua sov tsis yog ib txwm xav tau; qhov twg siab tshaj corrosion kuj xav tau, sib piv qis -carbon muab tub lim xws li ER316L lossis ER316LSi raug pom zoo. Formability thiab machinability zoo ib yam li 316, txawm hais tias cov ntsiab lus molybdenum ua rau machining me ntsis xav tau ntau tshaj li 304. Cov tshuaj annealing, thaum xav tau, yog nqa tawm ze 1010-1120℃tom qab txias txias.

Tej kev siv

Chemical thiab petrochemical cov hlab ntsha, tank thiab kav dej

Cov khoom siv tshuaj thiab bioprocess

Cov kab ua zaub mov thiab dej haus

Thaum tshav kub kub exchangers thiab condensers nyob rau hauv chloride - bearing dej txias

Coastal architectural Cheebtsam thiab handrails

Cov cuab yeej phais thiab cov khoom cog- qib kho vajtse qhov twg tau teev tseg

Cov lus nug nquag

1. Puas yog SUS316L haum rau kev cog ntoo?

316L- hom austenitic steel muaj keeb kwm ntev hauv cov khoom siv kho mob. Implant- cov ntaub ntawv qib, txawm li cas los xij, yog tsim los rau kev tswj nruj dua ntawm kev suav nrog, microcleanliness thiab mechanical zoo sib xws, feem ntau teev raws li 316LVM (UNS S31673) rau ASTM F138 lossis ISO 5832-1. SUS316L ib JIS G4304 zoo haum rau cov cuab yeej phais thiab cov khoom siv hauv tsev kho mob, thaum cov khoom siv cog cog qoob loo yuav tsum hu rau cov kev kho mob-qib sib txawv qhia meej.

2. Puas tuaj yeem siv SUS316L ntawm qhov kub thiab txias?

Yog lawm. Raws li qib austenitic tag nrho, SUS316L khaws cov kev cuam tshuam zoo heev rau -196℃thiab qis dua, thiab nws yog dav siv rau cov roj liquefied cia, cryogenic piping thiab siab hlab ntsha tsim los rau ASME cov cai. Cov ntsiab lus qis carbon yog qhov zoo dua ntxiv vim tias nws tsis txhob muaj nag lossis daus carbide thaum lub sijhawm vuam ntau dhau ntawm cov khoom siv cryogenic.

3. SUS316L coj tus cwj pwm li cas nyob rau hauv ib puag ncig acid?

Qib resists dilute sulfuric acid, phosphoric acid thiab feem ntau cov organic acids ntawm nruab nrab kub, thiab nws outperforms 304L nyob rau hauv cov xov xwm. Nws tsis haum rau kub concentrated hydrochloric acid los yog lwm yam uas muaj zog txo acids, qhov siab dua - alloy cov ntaub ntawv xws li super- austenitic los yog npib tsib xee- qib raws li yuav tsum tau.

4. Dab tsi yog qhov txawv ntawm SUS316 thiab SUS316L rau vuam?

Cov pa roj carbon txwv: SUS316L tso cai 0.03% siab tshaj plaws thaum SUS316 tso cai 0.08% siab tshaj. Nyob rau hauv hnyav welded seem, cov pa roj carbon ntau dua ntawm SUS316 tuaj yeem ua rau cov chromium carbides nyob rau hauv tshav kub- cuam tshuam cheeb tsam thaum vuam, ua rau rhiab heev thiab intergranular corrosion txaus nyob rau hauv kev pab cuam. SUS316L zam qhov no thiab feem ntau yog siv los ua -welded, uas yog vim li cas L qib dominate cov khoom siv tshuaj welded.

5. Yuav tsum muaj kev saib xyuas dab tsi rau kev siv ntug hiav txwv?

Txawm hais tias SUS316L tiv thaiv cov huab cua hauv hiav txwv, chloride deposits nyob rau hauv av, marine kev loj hlob los yog hauv crevices tuaj yeem pib pitting. Kev ntxuav nrog dej tshiab txhua lub sijhawm, tshem tawm sai sai, thiab cov qauv tsim kom tsis txhob muaj cov kab nrib pleb thiab muab cov kua dej txuas ntxiv rau lub neej. Hauv thaj tsam loj heev los yog dej hiav txwv cua sov, 6% molybdenum super- qib austenitic yog ib qho kev nyab xeeb dua.