ASTM A 240 Cov Lus Qhiayog qhov tshwj xeeb rau chromium thiab chromium-nickel stainless hlau phaj, ntawv, thiab sawb rau cov hlab ntsha siab thiab kev siv dav dav. Hom 2507 nyob rau hauv qhov kev qhia tshwj xeeb yog hais txog qib tshwj xeeb: asuper duplex stainless hlausau npe uaUNS S32750nyob rau hauv American system thiabEN 1.4410 (X2CrNiMoN25-7-4)nyob rau hauv European system. Lub npe lag luam feem ntau cov neeg paub yogTIAB SA 2507, Ameslikas tsim los ntawm Sandvik (tam sim no Alleima) hauv Sweden thaum ntxov 1970s.
Qhov "super" hauv super duplex txhais tau hais tias cov alloy zaum saum tus PREN (Pitting Resistance Equivalent Number) pib ntawm 40. Standard duplex qib zoo li 2205 (UNS S32205) zaum ntawm PREN 35-36. Super duplex 2507 zaum ntawm 42-43. Tus lej dhia ntawd tsis yog kev kawm - nws yog qhov sib txawv ntawm cov khoom siv uas muaj sia nyob 20 xyoo hauv North Sea seawater thiab ib qho uas pib pitting xyoo peb.
Ib yam uas ua rau muaj kev ntxhov siab tiag tiag hauv kev yuav khoom: lub npe "2507" yog siv xoob. Qee tus neeg muag khoom muagUNS S32760(tseem ua lag luam raws li Zeron 100 lossis F55) hauv qab "2507" daim ntawv lo. S32760 yog ib qho cuam tshuam tab sis txawv super duplex qib - nws muaj tungsten (0.5-1.0%) thiab tooj liab (0.5-1.0%) uas S32750 tsis muaj.
Cov Khoom Muag Khoom
Bar & Rod
Phaj & Ntawv
Coil & Sawb
Tube & Tube
Haum: Flange, Tee, Luj Tshib, Reducer thiab lwm yam.
Forging: Nplhaib, Ncej, Vajvoog, Thaiv thiab lwm yam.
ASTM A240 Hom 2507 Cov Khoom Siv Tshuaj
| Lub ntsiab | Spec Min (%) | Spec Max (%) | Muaj nuj nqi hauv Alloy |
|---|---|---|---|
| Cov pa roj carbon (C) | - | 0.030 | Khaws qis kom tsis txhob hnov qab thiab intergranular corrosion |
| Chromium (Cr) | 24.00 | 26.00 | Thawj qhov corrosion kuj tseem ceeb; stabilizes ferrite theem; tsim cov yeeb yaj kiab passive Cr₂O₃ |
| Nickel (Ni) | 6.00 | 8.00 | Stabilizes austenite theem; muab toughness; balances ferrite -austenite ratio |
| Molybdenum (hli) | 3.00 | 5.00 | Tsis kam rau pitting thiab crevice corrosion nyob rau hauv ib puag ncig chloride; tseem ceeb contributor rau PREN |
| Nitrogen (N) | 0.24 | 0.32 | Muab ob npaug rau hauv austenite stabilizer thiab pitting kuj enhancer; tus nqi ntau tshaj -pab PREN booster ib feem pua |
| Manganese (Mn) | - | 1.20 | Deoxidizer; me me austenite stabilizer |
| Silicon (Si) | - | 0.80 | Deoxidizer |
| Phosphorus (P) | - | 0.035 | impurity - tswj kom tsis txhob embrittlement |
| Sulfur (S) | - | 0.020 | Impurity - khaws cia qis rau weldability thiab corrosion kuj |
| Copper (Cu) | - | 0.50 | Cov seem tsuas yog hauv S32750; txhob txwm ua hauv S32760 (qhov sib txawv tseem ceeb ntawm ob qib) |
ASTM A240 Hom 2507 Mechanical Property Requirements
| Khoom | Yam tsawg kawg nkaus | Txoj Kev Xeem | Sau ntawv |
|---|---|---|---|
| Tensile zog (UTS) | 795 MPa (115 ksi) | ASTM E8 / EN ISO 6892-1: 1 | Kwv yees li 1.5 × UTS ntawm 316L |
| 0.2% Yield zog | 550 MPa (80 ksi) | ASTM E8 / EN ISO 6892-1: 1 | Kwv yees li 2 × yield ntawm 316L; enables thinner phab ntsa tsim |
| Elongation hauv 2 "(50mm) | 15% | ASTM E8 | Tsawg dua qib austenitic - ductility yog pauv rau lub zog |
| Hardness | Tsawg dua lossis sib npaug rau 310 HBW | ASTM E10 / EN ISO 6506-1 | Qhov siab tshaj plaws hardness cap tiv thaiv cov khoom tawg los ntawm kev nkag mus rau kev pabcuam |
| Charpy Impact (yog tias muaj) | Feem ntau 40-70 J ntawm -46 degree | ASTM E23/EN ISO 148-1 | Tsis raug yuam los ntawm A240 tab sis feem ntau xav tau los ntawm qhov project specs rau offshore thiab cryogenic kev pab cuam |
Qhov Yield Strength Advantage
Qhov tsawg kawg nkaus 550 MPa tawm los yog ib qho tseem ceeb tshaj plaws ntawm kev lag luamType 2507 phaj. Muab piv rau 316L (yield ~ 205 MPa), nws tso cai rau cov neeg tsim qauv kom txo cov phab ntsa tuab los ntawm kwv yees li 40-50% rau tib qhov kev ntsuas siab. Ntawm lub nkoj loj loj lossis cov kav dej hiav txwv, qhov kev txo qis ntawd txhais tau tias qhov hnyav thiab cov nqi txuag - txawm tias tus nqi ib kilogram ntawm 2507 yog 3-5 × siab dua 316L. Tus nqi tag nrho ntsia tau qis dua.
Cov Khoom Muag Khoom, Qhov Loj, thiab Kev Pom Zoo
ASTM A240 npog phaj, ntawv, thiab sawb. Rau Hom 2507, cov khoom siv tswv yim uas koj yuav ntsib feem ntau yogkub-rolled phaj, vim hais tias cov alloy cov ntaub ntawv tseem ceeb (cov hlab ntsha siab, cov qauv ntawm ntug dej hiav txwv, cov ntawv kub kub exchanger tubesheets) xav tau cov khoom tuab.
| Daim ntawv khoom | Thickness Ntau | Cov dav dav | Yam Ntev |
|---|---|---|---|
| Txias- yob daim ntawv | 0.5-4.0 hli | 1000, 1219, 1500 mm | 2000-6000 hli |
| Kub- dov phaj (No.1 tiav) | 3.0-80 hli | 1500-2500 hli | 3000-12000 hli |
| Quarto phaj (txiav los ntawm dov phaj) | 5-100 hli | Txog li 2500 mm | Mus txog 12000 mm |
Thickness kam rau ua rau ASTM A240 phaj yog txhais nyob rau hauv ASTM A480 (cov lus qhia dav dav). Super duplex phaj zoo li yuav dov rau qhov hnyav dua li qib austenitic vim tias cov hlau alloy lub zog siab tiv thaiv dov txo. Qhov no txhais tau tiasminus kam rau ua yuav tom nyuaj- yog tias koj xaj 10 hli phaj thiab tau txais cov khoom ntawm 9.4 hli (hauv A480 kam rau ua), thiab koj tus tsim xav tau qhov tsawg kawg nkaus 9.5 hli phab ntsa tom qab machining, koj muaj teeb meem. Qhia kom meej rau chav kawm nruj dua lossis txiav txim rau nominal-ntxiv rau yog tias koj daim ntawv thov tuab- tseem ceeb.
S32750 vs S32760: Qhov tsis meej pem uas raug nqi nyiaj
Qhov no yog lub ntsiab lus uas cov ntsiab lus hauv online tam sim no nyuam qhuav npog, tab sis nws ua rau muaj teeb meem kev yuav khoom tiag tiag. Ob qib super duplex feem ntau muag raws li "2507" lub npe:
| Khoom | UNS S32750 (Hom 2507) | UNS S32760 (Zero 100 / F55) |
|---|---|---|
| ASTM A240 Qib Lub Npe | Ib 2507 | Hom 32760 (cov npe sib cais) |
| Chromium | 24-26% | 24-26% |
| Nickel | 6-8% | 6-8% |
| Molybdenum | 3-5% | 3-4% |
| Nitrogen | 0.24-0.32% | 0.20-0.30% |
| Tungsten (W) | Tsis tau teev tseg | 0.50-1.00% |
| Copper (Cu) | Tsawg dua lossis sib npaug li 0.50% (residual) | 0.50-1.00% (kev xav) |
| Hom PREN | 42-43 | 42-43 |
| Tsim los ntawm | Sandvik (Sweden) | Weir Materials (UK) |
Ob qib muaj qhov zoo sib xws corrosion thiab mechanical zog, thiab nyob rau hauv ntau daim ntawv thov lawv yog functionally interchangeable. Tab sis lawv yogtsis yog cov khoom qub. Lub tungsten nyob rau hauv S32760 txhim kho kev tiv thaiv rau crevice corrosion nyob rau hauv tej qhov chaw tab sis kuj tseem tuaj yeem ua kom cov dej nag hauv sigma yog tias tsis tswj tau. Cov tooj liab hauv S32760 txhim kho sulfuric acid tsis kam tab sis tsis cuam tshuam rau kev pabcuam dej hiav txwv.
Qhov teeb meem Sigma Phase: Vim li cas Cov Ntaub Ntawv Kho Mob Kub Tseem Ceeb
Sigma theem yog intermetallic compound (FeCr) uas precipitates hauv super duplex stainless hlau thaum cov khoom raug kub ntawm 700℃thiab 1000℃ntev heev. Cov nag lossis daus tshwm sim thaum lub caij txias txias los ntawm cov tshuaj annealing kub, thaum lub sij hawm ntev tuav ntawm qhov kub siab, los yog thaum lub sij hawm welding nrog cov cua kub ntau dhau. Thaum sigma theem cov ntaub ntawv, nws:
- Txo qhov cuam tshuam qhov hnyav heev - Charpy qhov tseem ceeb tuaj yeem poob ntawm 70J mus rau qis dua 10J
- Txo corrosion kuj - tshwj xeeb tshaj yog pitting thiab crevice corrosion kuj
- Tsis tuaj yeem thim rov qab los ntawm kev kho cua sov uas tsis yog tag nrho re- kev daws teeb meem anneal
Qhov no txhais tau li cas rau kev yuav khoom: cov ntaub ntawv kho cua sov ntawm daim ntawv pov thawj zeb tsis yog cov ntaub ntawv xwb. Nws yog pov thawj tias lub phaj tau quenched sai txaus kom tsis txhob sigma theem. MTR yuav tsum qhia:
Kev daws annealing kub:Yuav tsum yog 1025-1125 degree. Yog tias nws pom qhov kub thiab txias sab nraum qhov no, cov khoom siv yuav tsis ua tau raws li qhov yuav tsum tau ua ntawm microstructural.
Txoj kev ua kom txias:Yuav tsum yog "dej quench" lossis "dej ceev ceev." Yog tias nws hais tias "cua txias" rau phaj tuab dua 6 hli, qhov ntawd yog tus chij liab - cua txias qeeb heev rau super duplex ntawm qhov tuab ntawd.
Cov txiaj ntsig ntawm ASTM A923:ASTM A923 yog tus qauv xeem txoj hauv kev txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau nws Txoj Kev A (etch metallography), Txoj Kev B (Charpy impact), los yog Txoj Kev C (ferric chloride corrosion test). Yog tias MTR tsis suav nrog A923 cov txiaj ntsig, thov lawv - tshwj xeeb rau cov phaj tuab dua li 12 hli, qhov uas qhov kev pheej hmoo ntawm sigma theem siab tshaj vim qhov txias qeeb ntawm nruab nrab - tuab.
Rau phaj tuab dua 25 hli, xav txog kev qhia ASTM A923 Txoj Kev A lossis C ntawm kev yuav khoom. Qee lub mills suav nrog nws raws li tus qauv; lwm tus tsis txawm nug. Tus nqi yog tsawg heev - ob peb puas duas las rau ib qho - tab sis nws paub tseeb tias cov khoom koj tau txais yog dawb ntawm intermetallic theem uas yuav cuam tshuam nws cov kev pab cuam.
Qhov twg Hom 2507 Phaj Tiag Kawg Ua Haujlwm
Desalination Nroj tsuag
Seawater rov qab osmosis (SWRO) thiab multi-theem flash (MSF) desalination nroj tsuag sivType 2507 phajrau siab - cov kav dej siab, cov twj tso kua mis, lub cev lub cev, thiab cov khoom siv hluav taws xob sib hloov tau raug rau cov dej hiav txwv sov chlorinated. Lub PREN Ntau dua lossis sib npaug rau 42 qhov pib yog qhov ua rau 2507 cov khoom nyiam - 316L pits hauv dej hiav txwv sov nyob rau lub hlis, thiab txawm tias 2205 tuaj yeem raug kev puas tsuaj rau ntawm qhov chaw gasket thiab hauv qab tso nyiaj. Middle East suav txog kwv yees li 48% ntawm lub ntiaj teb desalination muaj peev xwm, ua rau nws lub lag luam loj tshaj plaws hauv cheeb tsam rau 2507 phaj hauv kev pabcuam desalination.
Roj thiab Roj - Upstream thiab Midstream
Subsea manifolds, flowlines, separators, heat exchangers, and wellhead equipment exposed to produce water containing chlorides and H₂S. Hom 2507 phaj yog tsim nyog rau kev pabcuam qaub raws li NACE MR0175 / ISO 15156, nrog kev txwv ntawm hardness (tsawg dua lossis sib npaug ntawm 28 HRC) thiab kev kho cua sov. Rau cov ntug dej hiav txwv, tshwj xeeb tshaj yog nyob rau sab qaum teb Hiav Txwv thiab Arabian Gulf, 2507 yog cov khoom siv txheem rau kev tuav dej hiav txwv, cov kav dej tua hluav taws, thiab cov khoom siv txheej txheem.
Tshuaj thiab Petrochemical ua
Cov hlab ntsha siab, cov khoom siv hluav taws xob sib hloov, cov reactors, thiab cov tank cia tuav cov tshuaj chloride -cov txheej txheem cov kwj deg, cov organic acids, thiab cov kua qaub. Hom 2507 phaj yog tshwj xeeb tshaj yog zoo nyob rau hauv ib puag ncig uas ob qho tib si chloride kev nyuaj siab corrosion cracking thiab uniform acid corrosion yog kev txhawj xeeb - ib tug ua ke uas rhuav tshem tus qauv austenitic stainless hlau.
Offshore thiab Marine Structures
Lub tshuab hluav taws xob hluav taws xob, cov kav dej ballast, cov riser clamps, cov khoom sib dhos, thiab cov kav dej hauv cov kav dej tawm ntawm ntug dej hiav txwv. Lub zog tawm los siab tso cai rau cov qauv tsim qauv sib dua, uas yog qhov tseem ceeb ntawm kev lag luam tawm sab nrauv qhov twg txhua kilogram ntawm qhov hnyav saum toj kawg nkaus muaj tus nqi sib npaug.
Lub zog tiam
Flue gas desulfurization (FGD) cov hlab ntsha absorber, cov dej txias hauv cov chaw tsim hluav taws xob hauv ntug dej hiav txwv, thiab cov khoom siv hluav taws xob sib hloov hauv cov ntawv thov hauv av uas muaj cov tshuaj chloride-cov kua dej sib cuag ntawm cov hlau.
Kev Ntsuas Zoo: MTR Daim Ntawv Teev Npe rau Super Duplex Phaj
Nyeem daim ntawv pov thawj zeb xeem rauType 2507 phajyuav tsum tau saib xyuas cov ntsiab lus uas tshwj xeeb rau cov qib super duplex. Ntawm no yog daim ntawv txheeb xyuas, hauv qhov kev txiav txim tseem ceeb:
Thaum tshav kub kub tooj thiab traceability:Txheeb xyuas tus naj npawb ntawm cov cua sov ntawm MTR sib phim cov cim stenciled ntawm lub phaj pob. Tsis phim=tsis lees paub.
UNS npe:Paub meej tias MTR qhia meej meej S32750, tsis yog "2507" lossis "super duplex." Yog tias nws hais tias S32760, koj muaj qib tsis raug.
Tshuaj muaj pes tsawg leeg:Txhua lub ntsiab lus yuav tsum poob hauv ASTM A240 txwv. Txheeb xyuas Cr Ntau dua lossis sib npaug rau 24.0%, Mo Ntau dua lossis sib npaug rau 3.0%, N Ntau dua lossis sib npaug rau 0.24%. Xam cov PREN los ntawm cov nqi hluav taws xob tiag tiag - nws yuav tsum Ntau dua lossis sib npaug rau 41 rau kev pabcuam dej hiav txwv, Ntau dua lossis sib npaug rau 42 rau kev pabcuam tseem ceeb.
Mechanical zog:UTS Ntau dua lossis sib npaug rau 795 MPa, tawm los Ntau dua lossis sib npaug rau 550 MPa, elongation Ntau dua lossis sib npaug li 15%. Yog hais tias elongation yog raws nraim 15%, thov kev ntsuam xyuas ntxiv - kom zoo annealed 2507 yuav tsum qhia 25% lossis siab dua.
Cov ntaub ntawv kho cua sov:Cov tshuaj annealed ntawm 1025-1125 degree, dej quenched. Yog tias txoj kev txias tsis tau teev los yog "cua txias" rau phaj> 6 hli, chij nws.
Hardness:Yog tias yuav tsum tau ua raws li NACE MR0175, txheeb xyuas qhov hardness tsawg dua lossis sib npaug rau 28 HRC (272 HBW). ASTM A240 siab tshaj plaws ntawm 310 HBW tsis txaus rau kev pabcuam qaub.
Cov ntsiab lus ferrite (yog tias muaj):Lub hom phiaj 45 ± 5% (los yog 40-55 FN). Qee qhov kev qhia tshwj xeeb xav tau kev ntsuas ferrite ntawm MTR. Yog tias nws ploj lawm, thov nws - tawm-ntawm-ntau ferrite qhia txog chemistry imbalance lossis kev kho cua sov tsis raug.
ASTM A923 Cov txiaj ntsig (yog tias muaj):Paub meej txog txoj kev A, B, lossis C cov txiaj ntsig qhia tsis muaj kev cuam tshuam ntawm cov theem intermetallic. Rau phaj> 12 hli, qhov kev sim no tau pom zoo txawm tias tsis xav tau.
NACE MR0175 tshaj tawm:MTR yuav tsum hais tias "NACE MR0175 / ISO 15156 ua raws" lossis "tsim nyog rau kev pabcuam qaub" nrog rau cov nqi hardness teev.
Tso cai kos npe thiab stamp:Daim ntawv pov thawj yuav tsum tau kos npe thiab traceable rau cov chaw tsim khoom qhov system zoo. Cov ntawv pov thawj uas tsis tau kos npe lossis luam theej duab tsis tuaj yeem lees txais rau cov ntawv thov tseem ceeb.
Fabrication thiab Vuam: Txoj Cai Super Duplex Xav Tau
Hom 2507 phaj yog nkag rau hauv cov tshuaj -annealed mob, npaj rau kev tsim, vuam, thiab machining. Tab sis super duplex tsis muaj kev zam txim tsawg dua li austenitic stainless hlau, thiab fabricators hloov los ntawm 316L yuav tsum tau kho lawv cov kev coj ua.
tsim
2507 muaj kwv yees li ob zaug lub zog tawm los ntawm 316L, uas txhais tau tias kev tsim yuav tsum muaj zog ntau dua. Phaj dabtsi yog khoov yob thiab nias brakes xav tau 40-50% ntau tonnage rau tib tuab. Springback kuj tseem ntau dua - cia siab tias 20-30% springback ntau dua 316L. Rau cov vojvoog nruj, qhov sov so ntawm 200-300℃tuaj yeem txo qhov kev pheej hmoo ntawm kev tawg, tab sis tsis pub tshaj 300℃- siab dua qhov kub, qhov dej nag los ua ib qho kev txhawj xeeb.
Vuam
Super duplex vuam yog kev qhuab qhia. Cov cai tseem ceeb:
Filler hlau:Siv tshaj -alloyed filler ER2594 (AWS A5.9) or ER2593. Cov muab tub lim dhau lawm- alloyed nrog npib tsib xee (9-12% vs. 6-8% hauv cov hlau hauv paus) kom ntseeg tau tias cov hlau vuam ua tiav qhov tseeb ferrite- austenite tshuav nyiaj li cas. Tsis txhob siv 2205 lossis 316L muab tub lim - qhov vuam yuav nplua ferrite thiab nkig.
Gas thaub qab:Siv argon nrog 2-3% nitrogen, lossis nitrogen ntshiab. Cov nitrogen hauv cov roj rov qab txhawb kev tsim cov austenite hauv cov hauv paus hla thiab tiv thaiv kom tsis txhob nitrogen los ntawm lub pas dej weld. Ntshiab argon tsis txaus rau super duplex.
Thaum tshav kub kub input:Tswj rau 0.5-2.5 kJ / mm. Tsawg dhau ua rau txias txias thiab ntau dhau ferrite. Siab dhau ua rau qeeb txias los ntawm 700-1000℃ntau yam, caw sigma theem nag lossis daus. Siv stringer hlaws dai, tsis weave cov txheej txheem.
Interpass kub:Khaws hauv qab 150 degree. Siv qhov kub thiab txias - qhia txog cov av nplaum lossis ib qho kev sib cuag pyrometer ntawm kev hla.
Ncej -kev tshuaj xyuas vuam:ASTM A923 kev xeem ntawm cov khoom siv vuam daim coupon. Kev ntsuas Ferrite (FerriteScope lossis metallography). Liquid penetrant inspection (LPI) rau qhov tsis xws luag. Cov no yog cov qauv yuav tsum tau ua rau offshore thiab siab- muaj cov ntawv thov.
Ncej -weld kev kho cua sov:Feem ntau tsis tas yuav tsum tau yog tias cov khoom siv hluav taws xob tau tswj tau. Yog tias qhov kev xav tias sigma theem (piv txwv li, los ntawm cov khoom siv hluav taws xob ntau dhau), tag nrho re- kev daws teeb meem ntawm 1050-1100℃tom qab dej quenching yog tib txoj kev kho.
Tshuab dhos
2507 tshuab zoo li lwm yam siab - zog, ua hauj lwm - hardening stainless qib. Cia siab tias 30-40% lub neej luv dua li 316L. Siv coated carbide inserts (TiAlN los yog AlTiN txheej), nruab nrab txiav ceev (40-60 m / min rau tig), thiab siab - siab coolant. Rigidity yog ib qho tseem ceeb - cov khoom siv lub zog siab txhais tau tias txhua yam cuab yeej deflection ua rau chatter, uas ua hauj lwm-hardens saum npoo thiab accelerates cov cuab yeej hnav.
Txiav
Kev txiav ntshav plasma yog siv tau nrog qhov tsis zoo - siv nitrogen lossis argon-hydrogen plasma gas, tsis yog huab cua plasma, kom tsis txhob muaj nitrogen paug ntawm qhov txiav. Laser txiav ua tau zoo heev ntug zoo rau nyias phaj. Waterjet txiav yog qhov zoo tagnrho rau cov phaj tuab thiab ua kom tsis muaj cua sov- thaj tsam cuam tshuam, tab sis nws qeeb. Rau tag nrho cov txheej txheem thermal txiav, zom rov qab txiav ntug los ntawm 1-2 hli ua ntej vuam kom tshem tawm thaj tsam kub.
Cov lus nug nquag
Dab tsi yog qhov txawv ntawm ASTM A240 Hom 2507 thiab EN 10088-3 1.4410?
Lawv yog tib yam alloy - UNS S32750 / EN 1.4410. ASTM A240 yog tus qauv Asmeskas rau lub tiaj tus-khoov stainless hlau; EN 10088-3 yog qhov sib npaug ntawm European. Chemistry thiab mechanical khoom yuav tsum yog qhov tseem ceeb zoo ib yam. Qhov sib txawv yog nyob rau hauv cov txheej txheem kam rau ua, cov ntsiab lus saum npoo tiav, thiab cov ntawv pov thawj. Txiav txim rau qhov twg tus qauv koj qhov project specifications references.
Puas yog Hom 2507 phaj sib nqus?
Yog, ib nrab. ferrite theem (kwv yees li 45% ntawm microstructure) yog ferromagnetic, yog li2507 :pabyuav nyiam cov hlau nplaum - txawm tias tsawg zog dua li cov hlau. Qhov no yeej muaj txiaj ntsig zoo rau kev paub qhov txawv ntawm cov qib austenitic xws li 316L, uas tsis yog- hlau nplaum. Txawm li cas los xij, kev txheeb xyuas PMI yuav tsum tseem siv cov cuab yeej XRF kom paub meej cov ntsiab lus Mo.
Hom 2507 puas tuaj yeem siv rau kev pabcuam qaub (H₂S ib puag ncig)?
Yog, nyob rau hauv tej yam kev mob. NACE MR0175 / ISO 15156 teev UNS S32750 raws li cov khoom siv tau rau cov kev pabcuam qaub, muab qhov hardness tsis pub tshaj 28 HRC thiab cov khoom yog nyob rau hauv cov tshuaj -annealed mob. Tus qauv kuj tseem txwv qhov kub thiab txias ib nrab ntawm H₂S nyob ntawm daim ntawv thov. Tshawb xyuas cov kev pabcuam tshwj xeeb tiv thaiv NACE MR0175 Table A.4 ua ntej qhia cov khoom siv.
Qhov kev pab kub siab tshaj plaws rau Hom 2507 phaj yog dab tsi?
Qhov kev txwv siab tshaj plaws rau kev pabcuam txuas ntxiv yog kwv yees li 250-300℃. Tshaj li 300 degree, sigma theem nag lossis daus ua rau muaj kev pheej hmoo ntau dhau sijhawm ntev. Rau kev pabcuam cuam tshuam ntawm qhov kub siab dua, tag nrho lub sijhawm ntawm qhov kub siab tshaj 300℃yuav tsum raug txwv. Cov khoom siv kuj tsis pom zoo rau cov kev pabcuam cryogenic hauv qab no -50℃, raws li cov theem ferrite tau hloov pauv hloov mus rau ductile.
Hom 2507 piv li cas rau 6% molybdenum super- qib austenitic zoo li 254SMO?
Ob leeg yog "super" corrosion-resistant stainless steels, tab sis lawv ua tiav lawv cov kev ua tau zoo los ntawm cov txheej txheem sib txawv. 2507 yog qib duplex (45% ferrite, 55% austenite) nrog PREN ~ 42 thiab yield zog ~ 550 MPa. 254SMO yog qib siab austenitic 43 thiab PREN + 0 yield muaj zog dua (ua kom nyias nyias tsim) thiab zoo dua kev ntxhov siab corrosion cracking tsis kam. 254SMO muab cov weldability zoo dua thiab muaj zog dua ntawm qhov kub thiab txias. Rau feem ntau cov dej hiav txwv thiab cov tshuaj chloride, 2507 yog tus nqi ntau dua - kev xaiv zoo vim muaj lub zog kom zoo dua.
Dab tsi welding muab tub lim hlau kuv yuav tsum siv nrog Hom 2507 phaj?
Siv tshaj -alloyed duplex filler ER2594 (AWS A5.9 classification, also sell as 2507P or 25.10.4.L). Cov muab tub lim muaj kwv yees li 9-12% npib tsib xee (vs. 6-8% hauv lub hauv paus hlau) kom ntseeg tau tias cov hlau vuam ua tiav qhov tseeb 45-55% ferrite tshuav nyiaj li cas tom qab ceev ceev. Rau qhov sib txawv ntawm cov welds rau carbon steel los yog austenitic stainless, ER309LMo lossis ERNiCrMo-3 (Inconel 625) muab tub lim tuaj yeem siv. Ib txwm siv cov pa roj uas muaj nitrogen (argon + 2-3% N₂ lossis N₂ ntshiab).
Kuv yuav ua li cas thiaj paub tseeb tias kuv tus neeg muag khoom lub phaj 2507 yog dawb ntawm sigma theem?
Thov ASTM A923 kuaj ntawm kev yuav khoom. Txoj Kev A (etch metallography) yog qhov ncaj qha tshaj plaws - nws pom kev txheeb xyuas cov theem intermetallic hauv microstructure. Txoj Kev B (Charpy cuam tshuam ntawm -40℃) yog qhov qhia tsis ncaj - qhov cuam tshuam qis zog qhia txog qib sigma. Txoj Kev C (ferric chloride corrosion test) ntsuas tus nqi corrosion, uas nce thaum sigma theem tam sim no. Rau phaj tuab dua 12 hli, Txoj Kev A lossis C raug pom zoo vim tias cov nag lossis daus feem ntau yog nyob rau nruab nrab-thickness qhov chaw txias tshaj plaws.
Yam tsawg kawg nkaus txiav txim kom muaj nuj nqis yog dab tsiASTM A240 Hom 2507 phaj?
Rau cov khoom lag luam ntawm lub chaw pabcuam lossis tus xa khoom, txiav - mus rau - cov khoom me me feem ntau muaj yam tsis muaj kev txiav txim yam tsawg kawg nkaus. Rau zeb- ncaj qha kev tsim khoom tsis yog- Tshuag loj, qhov tsawg kawg nkaus yog 1-3 metric tons rau phaj. Kev txiav txim me me los ntawm cov khoom lag luam nqa kev txiav thiab tuav tus nqi ntawm 20-40%. Rau qhov project kom muaj nuj nqis (5+ tons), direct mill pricing yog qhov pheej yig dua.
