2205 vs 2507 Duplex Stainless Hlau: Muaj pes tsawg leeg, Khoom thiab Kev Xaiv
Jan 05, 2026
Tso lus
Duplex Stainless Steels ntawm ib sab
Duplex stainless hlau ua ke ob-theem microstructure ntawm qhov sib npaug ntawm ferrite thiab austenite. Cov qauv dual muab cov txiaj ntsig muaj zog kwv yees li ob npaug ntawm 304 lossis 316 austenitics, zoo toughness, thiab zoo heev tsis kam mus rau chloride kev nyuaj siab corrosion cracking, uas zoo tib yam austenitic qib tsis tuaj yeem muab. Ob chav ua haujlwm ntawm tsev neeg yog 2205, tus qauv duplex qib, thiab 2507, qib super duplex nrog ntau dua chromium, molybdenum thiab nitrogen.
Tshuaj muaj pes tsawg leeg (ASTM A240)
Muaj pes tsawg leeg ntawm ASTM A240 rau UNS S32205 (2205) thiab UNS S32750 (2507), hauv qhov hnyav feem pua:
| Element | 2205 (S32205) | 2507 (S32750) |
|---|---|---|
| Cov pa roj carbon (C) | 0.030 max | 0.030 max |
| Manganese (Mn) | max 2.00 Nws | 1.20 max |
| Silicon (Si) | max 1.00 Nws | 0.80 max |
| Phosphorus (P) | 0.030 max | 0.035 max |
| Sulfur (S) | 0.020 max | 0.020 max |
| Chromium (Cr) | 22.0-23.0 | 24.0-26.0 |
| Nickel (Ni) | 4.5-6.5 | 6.0-8.0 |
| Molybdenum (hli) | 3.0-3.5 | 3.0-5.0 |
| Nitrogen (N) | 0.14-0.20 | 0.24-0.32 |
Mechanical Properties (ASTM A240)
| Khoom | 2205 (S32205) | 2507 (S32750) |
|---|---|---|
| Yield zog (0.2% offset) | 450 MPa min | 550 MPa min |
| Tensile zog | 655 MPa min | 795 MPa rau min |
| Elongation | 25% min | 15% min |
| Hardness | 293 HWB max | 310 HWB max |
Qhov siab dua nitrogen thiab molybdenum ntawm 2507 kuj nce nws cov pov thawj lub zog, yog li cov ntu nyias tuaj yeem hloov pauv rau 2205 lossis austenitic designs.
Corrosion Resistance thiab PREN
Tus lej sib npaug pitting, PREN=Cr + 3.3 Mo + 16 N, yog tus qauv ntsuas ntsuas rau chloride pitting resistance. 2205 mus txog PREN ntawm txog 34, thaum 2507 ncav cuag li 42. Hauv seawater kev pabcuam, 2205 feem ntau lees txais mus txog 5 txog 20 degrees, qhov twg immersion. Txuas ntxiv qhov txwv mus txog 60 ° C thiab tseem tiv taus cov kev pabcuam qaub nrog hydrogen sulfide, uas yog vim li cas super duplex tau teev tseg rau kev tsim tawm sab nrauv, cov khoom siv hauv qab hiav txwv thiab cov roj flue desulfurization units tuav cov tshuaj chloride ntxiv rau cov kua qaub. Ob qib tiv thaiv chloride kev ntxhov siab corrosion tawg zoo dua li 304/316, thiab ob qho tib si yuav tsum tau muab cov tshuaj annealed ntawm 1020-1100 degrees C tom qab kub ua kom rov qab ferrite-austenite tshuav nyiaj li cas.
Cov qauv thiab cov qauv khoom
Ob qib yog them raws li phaj thiab daim ntawv los ntawm ASTM A240, raws li welded thiab seamless yeeb nkab los ntawm ASTM A789 / A790, thiab raws li bar thiab forgings los ntawm ASTM A276 / A182. Hauv European system 2205 sib raug rau EN 1.4462 (X2CrNiMoN22-5-3) thiab 2507 rau EN 1.4410 (X2CrNiMoN25-7-4) rau EN 10088-2 thiab EN 10088-3. Tus qauv Japanese JIS G4304 / G4305 suav nrog 2205-hom qib raws li SUS329J3L; super duplex tsis muaj npe ncaj qha JIS thiab feem ntau teev rau ASTM lossis EN. Cov khoom lag luam feem ntau yog phaj, ntawv, sawb, seamless thiab welded yeeb nkab, raj, bar, fittings thiab forgings.
Kev Taw Qhia Xaiv
Xaiv 2205 rau cov dej hiav txwv -txias cua kub exchangers, chemical tankers, desalination nroj tsuag, pulp digesters thiab kev ua chemical ua qhov twg chloride thiab kev nyuaj siab corrosion yog xav tau ntawm tus nqi nruab nrab; 2205 feem ntau yog 30-50% pheej yig dua 2507 ib tuj.
Xaiv 2507 rau offshore topside thiab subsea khoom, siab - chloride thiab qaub roj kev pab cuam, FGD absorbers, thiab txheej txheem kwj qhov twg 2205 yuav pit.
Rau kev txo qis acids lossis dej hiav txwv kub siab tshaj qhov txwv duplex, txheeb xyuas qhov ua tau zoo los ntawm kev sim, vim tias tsis muaj qib duplex cuam tshuam qhov corrosion kuj ntawm siab -molybdenum npib tsib xee- puag alloys nyob rau hauv qhov chaw nruj tshaj plaws.
Cov lus nug nquag
Duplex txhais li cas?Duplex stainless hlau muaj ob-theem microstructure ntawm li 50% ferrite thiab 50% austenite, sib txuas lub zog siab ntawm ferritic steels nrog lub toughness thiab corrosion kuj ntawm austenitic steels.
Dab tsi yog qhov txawv ntawm 2205 thiab 2507?2507 muaj ntau cov chromium, molybdenum thiab nitrogen ntau tshaj 2205, tsa nws cov PREN ntawm li 34 txog 42 thiab txuas ntxiv kev pabcuam dej hiav txwv los ntawm kwv yees li 50 ° C mus txog 60 ° C; nws kuj muaj zog tawm los ntau dua (550 MPa vs 450 MPa) thiab tus nqi siab dua.
PREN yog dab tsi?PREN yog tus lej sib npaug pitting tsis kam, PREN=Cr + 3.3 Mo + 16 N, qhov ntsuas ntsuas rau kev tiv thaiv pitting hauv chloride media. Cov nqi siab dua qhia tias muaj kev tiv thaiv zoo dua.
Duplex stainless hlau puas tuaj yeem welded?Yog lawm. Vuam yog ua los ntawm kev sib tw duplex fillers, feem ntau 22Cr{10}}9Ni-3Mo hom rau 2205 thiab 25Cr-9Ni-4Mo hom rau 2507, nrog tswj cov cua sov input thiab interpass kub. Tsis xav tau kev kho cua sov tom qab vuam.
Tus nqi ntau npaum li cas yog 2507 dua 2205?2507 feem ntau raug nqi 30-50% ntau dua 2205 vim tias cov ntsiab lus alloy siab dua thiab kev xav tau ntau dua, yog li qib yuav tsum raug xaiv tsuas yog qhov chaw ib puag ncig yuav tsum muaj PREN siab dua thiab lub zog.
Kuv yuav xaiv qib twg duplex rau seawater?Rau cov dej hiav txwv txuas ntxiv mus rau hauv qab ntawm 50 ° C, 2205 feem ntau yog txaus; saum toj no qhov kub thiab txias, los yog qhov chaw crevice mob hnyav, 2507 los yog siab dua - alloy super duplex qib tau pom zoo.
Xa kev nug