316 vs 316Ti Steel Phaj: Uas Zoo dua?

Nob qib yog universally 'zoo dua'. 316 yog qhov kev lag luam ntau dua, muaj kev xaiv dav dav rau cov khoom siv hauv cov khoom siv annealed. 316Ti khwv tau nws cov nqi them thaum cov khoom siv welded yuav pom qhov kub thiab txias ntawm 425℃thiab 850℃yam tsis muaj kev tshaj tawm -weld heat treatment - 16 qhov xwm txheej yog qhov zoo tshaj plaws 316Ti yog.

Ua ntej dhia mus rau hauv kev nthuav dav, ntawm no yog qhov sib piv ncaj qha uas teb cov neeg yuav khoom feem ntau cov lus nug thawj. Lub rooj siv lub ntsiab lus ntsuab los qhia tias qib twg muaj qhov zoo dua hauv txhua qeb:

Kev ua haujlwm qeb	316 Standard	316 Ti
Sensitization kuj (welded, tsis muaj anneal)	Tsis zoo - carbides daim ntawv ntawm grain ciam teb saum toj no 425 degree	Zoo heev - Ti khi cov pa roj carbon, tiv thaiv rhiab heev
Base phaj corrosion kuj (annealed)	Zoo heev - sib npaug rau 316Ti nyob rau hauv zeb mob	Zoo heev - sib npaug rau 316 nyob rau hauv annealed mob
High-temperature strength (>500 degree)	Nruab nrab	Zoo me ntsis - Ti pins lis ciam teb
Pitting kuj (PREN)	Sib npaug - PREN ≈25 rau ob qib	Sib npaug - tib yam Cr thiab Mo cov ntsiab lus
Khoom siv	Tsawg - tsis muaj titanium ntxiv	5-15% premium tshaj 316
Kev muaj thoob ntiaj teb	Zoo heev - cov khoom lag luam nyob txhua qhov chaw	Zoo - tej zaum yuav xav tau kev txiav txim zeb hauv qee lub khw
Machineability	Zoo	Ib qho nyuaj me ntsis vim TiC suav nrog
Weld cheeb tsam corrosion kuj (tsis muaj anneal)	Txo - rhiab heev nyob rau hauv HAZ	Kev tiv thaiv tag nrho khaws cia hauv HAZ
Surface finish quality (phaj)	Zoo heev - smoother, tsis muaj TiC nto cim	Zoo - TiC particles tuaj yeem ua rau me me blemish
Ua raws li: nuclear thiab zaub mov cai	Txais dav	Txais; txheeb xyuas Ti nrog txoj cai lij choj

Ob qib yog nyob rau 316 tsev neeg ntawm molybdenum-cov kabmob austenitic stainless hlau. Tsev neeg yog tus cwj pwm los ntawm 16-18% chromium, 10-14% npib tsib xee, thiab 2-3% molybdenum - kev sib xyaw ua ke uas ua rau muaj kev tiv thaiv corrosion zoo thiab tshwj xeeb yog lub hom phiaj tiv thaiv chloride pitting, tsis muaj zog ntawm cov laus 304 tsev neeg.

AISI 316 (UNS S31600) yog tus qauv ua haujlwm ntawm tsev neeg, siv thoob plaws hauv kev ua zaub mov, kev tsim tshuaj, khoom siv marine, tshuaj cog, thiab kev siv vaj tse. Nws yog ib qho ntawm cov qib stainless hlau ntau tshaj plaws nyob rau hauv lub ntiaj teb no, nrog rau cov khoom siv dav dav thiab cov nqi sib tw.

AISI 316 Ti (UNS S31635) ntxiv ib qho kev txiav txim siab titanium ntxiv - feem ntau 5 × %C rau 0.70% los ntawm qhov hnyav - rau tus qauv 316 muaj pes tsawg leeg. Cov titanium no ua raws li 'carbon scavenger': nws muaj cov tshuaj lom neeg muaj zog rau cov pa roj carbon ntau dua li cov chromium ua, yog li ntawm qhov kub siab, cov pa roj carbon zoo dua tsim titanium carbides (TiC) es tsis yog chromium carbides (Cr₂₃C₆). Qhov no yog tag nrho engineering rationale rau 316Ti lub neej.

Cov tshuaj muaj pes tsawg leeg ntawm ASTM A240 yuav luag zoo tib yam tshwj tsis yog rau cov titanium ntxiv hauv 316Ti thiab cov pa roj carbon monoxide sib txawv:

Element	316 (ASTM A240)	316 Ti (ASTM A240)	Qhov tseem ceeb
Chromium (Cr)	16.0–18.0%	16.0–18.0%	Tib yam - corrosion kuj hauv paus
Nickel (Ni)	10.0–14.0%	10.0–14.0%	Tib yam - austenite stabilizer
Molybdenum (hli)	2.0–3.0%	2.0–3.0%	Tib - pitting kuj
Cov pa roj carbon (C)	Tsawg dua lossis sib npaug li 0.08%	Tsawg dua lossis sib npaug li 0.08%	Tib max; Tab sis Ti neutralizes C hauv 316Ti
Titanium (Ti)	Tsis ntxiv	5 × C min, Tsawg dua lossis sib npaug li 0.70%	Qhov tseem ceeb sib txawv - stabilizes tiv thaiv rhiab heev
Nitrogen (N)	Tsawg dua lossis sib npaug li 0.10%	Tsawg dua lossis sib npaug li 0.10%	Ib yam
Manganese (Mn)	Tsawg dua lossis sib npaug li 2.00%	Tsawg dua lossis sib npaug li 2.00%	Ib yam
Silicon (Si)	Tsawg dua lossis sib npaug li 0.75%	Tsawg dua lossis sib npaug li 0.75%	Ib yam
Phosphorus (P)	Tsawg dua lossis sib npaug li 0.045%	Tsawg dua lossis sib npaug li 0.045%	Ib yam
Sulfur (S)	Tsawg dua lossis sib npaug li 0.030%	Tsawg dua lossis sib npaug li 0.030%	Ib yam

Cov mis titanium yam tsawg kawg nkaus (5 × % C) ua kom muaj titanium txaus ib txwm muaj los khi tag nrho cov pa roj carbon monoxide raws li TiC ua ntej cov chromium carbide tuaj yeem tsim. Rau lub phaj ntawm qhov siab tshaj plaws ntawm 0.08%, qhov no txhais tau tias tsawg kawg yog 0.40% titanium yuav tsum muaj. Hauv kev xyaum, cov neeg tsim khoom feem ntau tsom 0.40-0.60% Ti rau kev ruaj ntseg ruaj khov.

Yuav kom nkag siab tias yog vim li cas 316Ti muaj nyob, koj yuav tsum nkag siab txog kev nkag siab. Thaum tus qauv austenitic stainless hlau zoo li 316 raug rau qhov kub thiab txias ntawm 425℃thiab 850℃- ib thaj tsam hu ua sensitization range lossis carbide nag lossis daus ntau - carbon atoms uas ib txwm muaj nyob rau hauv cov kev daws teeb meem tsiv mus rau cov ciam teb thiab ua ke nrog cov chromium atoms nyob ze rau ₆Cromium.

The Sensitization Problem Why 316Ti Was Invented

Qhov tshwm sim yog chromium- thaj tsam depleted tam sim ntawd nyob ib sab ntawm txhua tus ciam teb. Cov cheeb tsam depleted no, qhov twg cov ntsiab lus chromium hauv zos poob qis dua qhov tseem ceeb ~ 11% qhov pib rau kev ua haujlwm dhau los, ua rau muaj kev cuam tshuam rau corrosive nres - tshwj xeeb yog cov kua qaub. Qhov tshwm sim tsis ua hauj lwm hom, hu ua intergranular corrosion los yog weld decay, tuaj yeem ua rau poob sai thiab cov khoom tseem ceeb.

Vuam yog feem ntau ua rau. Thaum tshav kub kub- thaj tsam cuam tshuam (HAZ) ntawm lub vuam hla dhau qhov ntsuas kub ntawm qhov kub thiab txias thaum lub sijhawm cua sov thiab txias. Nyob rau hauv ib feem uas yog welded thiab ces muab tso ncaj qha mus rau hauv kev pab cuam - tsis muaj ib tug ncej-weld tov annealing tshav kub kev kho mob rau re-kua cov carbides - cheeb tsam no mus tas li sensitized.

316Ti tshem tawm qhov kev pheej hmoo no los ntawm kev muab cov pa roj carbon 'trap' hauv daim ntawv ntawm titanium. Vim tias TiC muaj qhov ntsuas kub ntau dua li Cr₂₃C₆ nyob rau hauv tib lub sijhawm, titanium khi cov pa roj carbon monoxide ua ntej yuav muaj chromium depletion. Qhov tshwm sim: 316Ti tuaj yeem welded yam tsis muaj kev tshaj tawm -weld annealing thiab yuav khaws nws tag nrho corrosion kuj nyob rau hauv tshav kub- cuam tshuam cheeb tsam.

Nyob rau hauv cov xwm txheej annealed, ob qib ua tau raws li ASTM A240 yam tsawg kawg nkaus. Ntawm qhov kub siab, 316Ti tuav qhov zoo me ntsis hauv kev tuav lub zog:

Mechanical Property	316 (ASTM A240, RT)	316 Ti (ASTM A240, RT)	Qhov twg zoo dua?
Min. tensile zog	Ntau dua lossis sib npaug li 515 MPa	Ntau dua lossis sib npaug li 515 MPa	Sib npaug ntawm chav tsev kub
Min. yield zog	Ntau dua lossis sib npaug li 205 MPa	Ntau dua lossis sib npaug li 205 MPa	Sib npaug ntawm chav tsev kub
Min. elongation	Ntau dua lossis sib npaug li 40%	Ntau dua lossis sib npaug li 40%	Sib npaug
Hardness (max)	Tsawg dua lossis sib npaug rau 217 HB	Tsawg dua lossis sib npaug rau 217 HB	Sib npaug
Tensile ntawm 500 degree	~ 380 MPa (ntaub ntawv)	~ 400 MPa (hom ntawv.)	316Ti zoo me ntsis
Tawm ntawm 500 degree	~ 130 MPa (hom ntawv.)	~ 145 MPa (ntaub ntawv)	316Ti zoo me ntsis
Creep strength (long-term, >500 degree)	Txuj	Txhim kho (Ti grain ciam pinning)	316t zoo

Qhov no yog qhov kev txiav txim siab ua tau zoo. Tus cwj pwm ntawm ob qib sib txawv heev nyob ntawm seb cov khoom puas tau welded yam tsis tau tshaj tawm -weld annealing:

Corrosion Mechanism	316 - Nthuav tawm	316 - Welded (tsis muaj anneal)	316Ti - Ob leeg Condition
Pitting kuj (PREN ≈25)	Zoo heev	Txo hauv HAZ	Zoo heev
Kev txhim kho corrosion	Zoo	Zoo	Zoo
Intergranular corrosion kuj	Zoo heev	Txaus siab rau hauv HAZ	Zoo heev
Kev ntxhov siab corrosion cracking (SCC)	Nruab nrab	Nruab nrab	Nruab nrab
Uniform acid corrosion	Zoo	Zoo (bulk)	Zoo
Weld lwj (hauv -kev pabcuam acid nres)	Tsis siv tau - annealed nkaus xwb	Kev pheej hmoo siab	Tsis siv tau - stabilized

Khoom	316 Standard	316 Ti
Qhov ntom	7.98 g/m²	7.96 g / cm³ (Ti qis dua qhov ceev)
Melting ntau	1375-1400 degree	1370-1400 degree
Thermal conductivity	~ 14.4 W / (m·K) ntawm 100 degree	~ 14.2 W / (m·K) ntawm 100 degree
Thermal expansion (20-100 degree)	16.5 µm / (m· degree)	16.0 µm / (m· degree)
Modulus ntawm elasticity	193 gp ua	193 gp ua
Max kev pab temp. (cont.)	870 degree	870 degree
Sib nqus permeability	Tsis yog-magnetic	Tsis yog-magnetic
Min. kev pabcuam temp.	-196℃(cryogenic muaj peev xwm)	-196℃(cryogenic muaj peev xwm)

Rau feem ntau pawg neeg yuav khoom, tus nqi thiab lub sijhawm ua haujlwm tseem ceeb npaum li kev ua haujlwm. Nov yog qhov kev ua lag luam tiag tiag ntawm ob qib:

Kev lag luam Factor	316 Standard	316 Ti
Tus nqi ntawm cov khoom siv txheeb ze	Lub hauv paus	5-15% premium (Ti surcharge)
Tshuag muaj	Tam sim ntawd los ntawm thoob ntiaj teb distributors	Tshuag hauv cov lag luam tseem ceeb; zeb txiav txim rau lwm tus
Cov qauv khoom txheem	Phaj, ntawv, yeeb nkab, bar, fittings, flanges	Phaj, ntawv, yeeb nkab, bar (cov yeeb nkab fittings tsawg dua)
Hom phaj thicknesses stocked	1-100mm (feem ntau qhov ntau thiab tsawg)	3-50 hli (thicker=zeb xaj)
Mill xeem ntawv pov thawj. txheem	EN 10204 2.2 lossis 3.1	EN 10204 3.1 (Yuav tsum muaj pov thawj Ti)
Lub sijhawm ua khoom lag luam (tsis yog- cov khoom loj)	2-4 lub lis piam	6-12 lub lis piam (mill dov)

Cov lus teb yog engineering-tsav, tsis raug nqi- tsav. Nug koj tus kheej ib lo lus nug ua ntej: puas yuav muaj ib qho welded seem ntawm lub phaj no raug kub hnyiab ntawm 425℃thiab 850℃hauv kev pabcuam, yam tsis muaj kev tshaj tawm tag nrho -weld solution anneal? Yog tias muaj, qhia 316Ti. Yog tias tsis yog, 316 yog qhov kev xaiv raug thiab pheej yig dua.

Xaiv 316Ti thaum:

Weld aav yuav raug rau 425-850℃kev pabcuam kub

Tshaj tawm -weld annealing yog impractical los yog txwv tsis pub

Heavy seem fabrication nrog ntau weld hla

Kub concentrated sulfuric lossis phosphoric acid ib puag ncig

Ntev - lub neej kev pab cuam lub neej yog qhov tseem ceeb thiab rov- kev tshuaj xyuas yog qhov nyuaj

Xaiv 316 thaum:

Cov khoom yuav raug siv nyob rau hauv annealed (mill{0}}supply) yam nkaus xwb

Vuam yuav ua raws li tag nrho cov tshuaj annealing

Cov peev nyiaj thiab cov khoom muaj nyob yog qhov tseem ceeb txwv

Daim ntawv thov kub nyob qis dua 400℃hauv kev pabcuam txuas ntxiv

Tight dimensional tolerances yuav tsum tau zoo machining

Yog tias koj cov khoom yuav raug siv nruj me ntsis hauv cov txheej txheem annealed phaj - yam tsis muaj vuam lossis nrog cov vuam ua raws li cov tshuaj tag nrho annealing - tsis muaj laj thawj ua haujlwm them tus nqi 316Ti. Cov qib ob yog qhov tseem ceeb sib npaug hauv kev tiv thaiv corrosion thiab cov khoom siv kho tshuab thaum ob qho tib si nyob rau hauv cov mob annealed.

316 Stainless Hlau Phaj Daim Ntawv Thov

Khoom noj khoom haus thiab dej haus ua khoom siv (tank, conveyors, chaw ua hauj lwm)

Pharmaceutical manufacturing nkoj thiab kav dej (siv annealed, tu tsis tu ncua)

Marine hardware thiab fittings (cov khoom siv lawj, railings, marine exhaust systems)

Architectural cladding, kem npog, thiab façade panels

Chemical cog piping thiab kub exchangers khiav hauj lwm hauv qab 400 degree

Cov cuab yeej kho mob thiab phais thiab khoom siv

316Ti Stainless Hlau Phaj Daim Ntawv Thov

Boiler shells, economizer casing, thiab kub exchanger headers khiav hauj lwm saum 500 degree

Petrochemical refinery nkoj thiab cov kav dej tsim los ntawm vuam yam tsis muaj kev tshaj tawm -weld anneal

Flue gas desulfurization (FGD) system Cheebtsam uas muaj cov kua qaub condensate

High -kub tshuaj reactors tuav cov organic acids

Fais fab nroj tsuag chav thiab condensate system Cheebtsam

Khoom noj khoom haus thiab brewery CIP (huv-hauv-} qhov chaw) tshuab nrog hnyav vuam thiab kua qaub ntxuav

Q: Puas yog 316Ti zoo dua 316 hauv txhua qhov xwm txheej?

A: Tsis yog. 316Ti tshwj xeeb zoo dua thaum cov khoom siv welded yuav ua haujlwm nyob rau hauv qhov kub thiab txias (425-850 degree) yam tsis muaj kev tshaj tawm -weld annealing. Nyob rau hauv lub annealed mob, ob qib muab sib npaug corrosion kuj thiab mechanical zog. Standard 316 yog qhov zoo dua thaum tus nqi, muaj, thiab machinability yog qhov tseem ceeb.

Q: Kuv puas tuaj yeem hloov 316Ti rau 316 yam tsis muaj kev hloov pauv?

A: Yog lawm, feem ntau . 316Ti yog qhov poob- hauv kev hloov kho dua 316 - tib qhov qauv qauv, tib yam khoom siv tsawg kawg nkaus, tib yam corrosion kuj nyob rau hauv annealed mob. Fabrication txheej txheem rau vuam yuav txawv me ntsis (316Ti muab tub lim hlau los yog 316L muab tub lim siv). Nco ntsoov lees paub nrog tus qauv tsim qauv (ASME, EN, thiab lwm yam) uas 316Ti tau teev tseg rau koj chav kawm siab thiab kev pabcuam.

Q: Puas yog 316Ti zoo ib yam li 316L hais txog kev ua haujlwm vuam?

A: Tsis yog . 316L (tsawg carbon, Tsawg dua los yog sib npaug rau 0.030% C) txo - tab sis tsis tshem tawm - rhiab heev txaus ntshai los ntawm kev txwv cov carbon muaj nyob rau hauv chromium carbides. Ntawm qhov kub thiab txias heev los yog txias txias, 316L tseem tuaj yeem ua rau rhiab heev . 316Ti tshem tawm qhov kev pheej hmoo los ntawm kev cuam tshuam cov pa roj carbon raws li TiC tsis hais txog qhov kub thiab txias. Rau cov ntawv thov uas xav tau tshaj plaws, 316Ti muab kev tiv thaiv kev ntseeg siab tshaj plaws.

Q: Kuv yuav tsum siv cov khoom siv hlau li cas rau vuam 316Ti?

A: Cov qauv kev pom zoo yog ER316Ti muab tub lim hlau lossis E316Ti electrode, uas phim cov hlau chemistry xws li titanium stabilizer. Xwb, ER316L (tsawg carbon, tsis muaj titanium) yog dav siv rau 316Ti welds nyob rau hauv qis dua -kub daim ntaub ntawv vim hais tias cov weld hlau nws tus kheej tsis stabilized - txawm li cas los, 316Ti puag hlau yog. Nco ntsoov sab laj cov txheej txheem vuam siv tau (WPS) rau koj daim ntawv thov.

Q: Dab tsi yog cov npe thoob ntiaj teb rau 316Ti?

A: 316Ti paub los ntawm ntau qhov sib npaug: AISI 316Ti (USA), UNS S31635 (USA), EN 1.4571 (Tebchaws Europe), X6CrNiMoTi17-12-2 (German/European chemical symbol), thiab GOST 10Kh17 (Tebchaws Europe). Thaum txiav txim thoob ntiaj teb, lees paub cov tshuaj muaj pes tsawg leeg thiab cov ntawv xeem tsis yog tso siab rau lub npe tsim ib leeg, raws li '316Ti' naming conventions txawv me ntsis raws li tus qauv.