Lub vuam muaj nws tus kheej chemistry - teeb tsa los ntawm kev muab tub lim, tsis yog lub hauv paus hlau. Nws muaj nws tus kheej microstructure - refined dendrites los ntawm sai solidification, tsis yog cov qauv wrought ntawm phaj. Nws muaj nws tus kheej tsis ua hauj lwm hom - sigma theem nyob rau hauv lub tshav kub- cuam tshuam cheeb tsam, nitride nag lossis daus yog tias tus nqi cua txias khiav mus, ferrite imbalance yog hais tias tus muab tub lim chemistry drifts. Weld yog ib yam khoom. Thiab yog tias koj kho nws zoo li ib kauj ruam hauv cov txheej txheem vuam es tsis yog ib qho ntawm cov khoom uas koj muaj lub luag haujlwm, koj2507 cevyuav dhau qhov hydrotest thiab ua tsis tiav hauv kev pabcuam.
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.
1. Vim li cas cov Weld yog ib yam khoom sib txawv
Txhua welded 2507 yeeb nkab muaj peb thaj chaw microstructural: lub hauv paus hlau (BM), tshav kub- cuam tshuam cheeb tsam (HAZ), thiab vuam hlau (WM). Lub hauv paus hlau yog cov phaj wrought lossis yeeb nkab raws li - dov thiab tov -annealed - nplua nplej, sib npaug ferrite -austenite, PREN 42. Weld hlau yog cam khwb cia - nws solidified los ntawm cov kua ntawm lub pas dej weld, nrog dendrites uas tsuas yog 10} reform li 100% kua austenite raws li cov weld txias. Lub HAZ yog qhov nqaim ntawm ib sab ntawm cov vuam uas tsis yaj tab sis pom qhov kub thiab txias ntawm 600℃mus txog rau lub zog thiab rov qab los - thiab lub voj voog thermal yog dab tsi tsim cov teeb meem metallurgical 2507 welds nto moo rau.
Qhov kev tshwm sim: cov hlau muab tub lim koj xaiv teeb tsa cov vuam hlau chemistry. Lub hauv paus hlau chemistry yog tsau. Thiab yog hais tias lub weld hlau chemistry tsis phim qhov HAZ microstructure xav tau kom nyob twj ywm, lub weld dhau WPS kev tsim nyog thiab tsis ua haujlwm. Qhov feem ntau version ntawm qhov tsis ua hauj lwm no yog weld pitting ntawm 80℃seawater uas lub hauv paus hlau yuav tau tuav - tib cov yeeb nkab, tib qhov kev pab cuam, tab sis qhov vuam yog qhov tsis muaj zog txuas.
2. Plaub Filler xaiv thiab txhua yam ua rau lub vuam
Rau vuam 2507 yeeb nkab, cov hlau muab tub lim tsis yog xaiv tau. Nws yog qhov sib txawv ntawm ib qho weld uas kav ntev txog 25 xyoo thiab qhov sib txuas uas ua rau lub qhov rooj zaum thib ob. Muaj plaub tus neeg sib tw sau npe, thiab tsuas yog ob ntawm lawv yog qhov tseeb.
| Filler | AWS Class | PREN_W (vs Base 42) | Nim Content | Thaum Twg Lawm | Thaum Twg Lawm |
|---|---|---|---|---|---|
| TIAB SA 2594 | A5.9 | ~ 44 (hli) | 9.5 – 10.5% | Default - subsea, qaub, tag nrho cov kev pabcuam tseem ceeb | Tsis muaj dab tsi; ER2594 yog lub neej ntawd kev nyab xeeb |
| TIAB SA 2553 | A5.9 | ~ 40 (kev sib tw) | 8.5 – 9.5% | Tsawg nruj kev pabcuam, khw muag khoom nkaus xwb | Subsea, qaub H2S siab tshaj 0.05 psi, chloride saum 30,000 ppm |
| TIAB SA 2209 | A5.9 | ~ 36 (hauv qab -match) | 8.0 – 9.0% | 2205 puag hlau -TSIS 2507 base | 2507 puag hlau (txhua lub sijhawm) |
| ER309 LMO | A5.9 | ~ 26 (tsis raug alloy) | 12.0 – 14.0% | Tsis muaj dab tsi rau 2507 | Txhua lub sijhawm- yuam kev Cr, yuam kev Mo, tsis ncaj ncees lawm N |
Cov lej uas tseem ceeb yog PREN_W (xws li tib yam li lub hauv paus hlau - %Cr + 3.3 × %Mo + 16 × %N, tsis muaj kev kho tungsten rau cov fillers) thiab cov ntsiab lus nickel. Cov npib tsib xee teeb tsa cov kev hloov pauv ntawm austenite thaum lub caij txias - tsawg dhau, thiab cov weld nyob twj ywm ferritic (nkig, tsis muaj corrosion kuj); siab dhau lawm, thiab cov weld mus austenitic (poob lub zog kom zoo dua ferrite theem muab).
ER2594 dhau lawm -ua tau raws li lub hom phiaj. Nws cov ntsiab lus nitrogen yog 0.25 - 0.30%, siab dua 0.28% hauv lub hauv paus hlau, vim tias qee qhov nitrogen poob rau hauv huab cua thaum lub sijhawm hloov mus thoob plaws arc. Cov nitrogen ntxiv them rau qhov kev poob ntawd thiab ua kom qhov kawg weld tso nyiaj khaws cia tus lej ferrite hauv 35-65%. ER2553 yog sib npaug (tib lub nitrogen raws li lub hauv paus hlau). ER2209 yog tus muab tub lim kom raug rau 2205 lub hauv paus hlau tab sis nyob rau hauv - sib phim rau 2507 - siv nws ntawm 2507 muab cov vuam nrog ferrite siab tshaj 65% thiab Cr2N nitride kev pheej hmoo. ER309LMo yog cov khoom siv stainless hlau rau kev sib koom ua ke stainless hlau rau carbon steel - nws tsis muaj nitrogen, tsis muaj molybdenum tshuav nyiaj li cas rau duplex, thiab tsis muaj kev lag luam raug siv rau 2507. Tsis tau nws tshwm sim hauv khw hauv pem teb vim nws muaj nyob hauv Tshuag.
Tus naj npawb ib zaug los txheeb xyuas thaum xa khoom: PREN_W ntawm qhov muab tub lim, ntawm MTC. Yog tias nws qis dua 40, koj tsis muaj ER2594 lossis ER2553. Koj muaj ib tug tsis ncaj ncees lawm muab tub lim.
3. Lub qhov rais cua sov cua sov - Vim li cas "Weld It Like 316L" Ua Rau Qhov Weld
Lub qhov rais 2507 cua sov input yog 0.5 txog 2.5 kJ / mm, thiab ob qhov kawg ntawm qhov teeb meem ntawd. Qhov qis kawg tiv thaiv Cr2N nitride nag lossis daus hauv HAZ (kev pheej hmoo thaum lub vuam txias dhau 800℃sai heev rau austenite los hloov kho). Qhov siab kawg tiv thaiv sigma theem nag lossis daus hauv HAZ (kev pheej hmoo thaum lub vuam txias dhau 600-1000℃qeeb dhau). Lub 0.5–2.5 kJ/mm band yog ib qho uas ntaus ob lub hom phiaj - nrawm txaus hla lub qhov ntswg sigma, qeeb txaus los hloov kho austenite.
Ib tug fabricator uas yog siv los vuam 316L yuav thawb lub tshav kub input mus txog 1.5-2.0 kJ / mm thiab hu nws ib tug zoo weld. Rau 316L, qhov zoo. Rau 2507, uas yog saum toj kawg nkaus ntawm kev nyab xeeb band - thiab ib qho kev hloov me me (qhov ntev arc, qeeb mus ncig ceev, ib ntu tuab uas tuav cov cua sov) thawb lub vuam mus rau hauv sigma -theem thaj chaw. WPS- cov qhab nia tsim nyog yog 0.5 txog 2.5 kJ / mm, tab sis cov txheej txheem ntau lawm - taw tes yuav tsum yog 0.8–1.5 kJ / mm kom tawm ntawm cov npoo rau qhov kev hloov pauv me me uas yuav tsum tau zam.
Lwm qhov rais uas tseem ceeb yog qhov kub thiab txias. Rau 2507, max 150℃- thiab zoo tshaj hauv qab 100℃rau kev pabcuam subsea. Tshaj li 150 degree, cov hlaws yav dhau los nyob kub ntev txaus rau HAZ kom khaws cov cua sov mus, thiab cov khoom siv hluav taws xob sib txuas hloov pauv qhov sib npaug ntawm ferrite.
Txoj cai siv tau: sau WPS mus rau lub qhov rais kaw ntom nti, tsis yog qhov tsim nyog dav. Yog tias WPS hais tias "0.5-2.5 kJ / mm," tus welder yuav ntaus 2.5 thaum cov xwm txheej tsis zoo. Yog hais tias WPS hais tias "0.8-1.5 kJ / mm," tus welder yuav tsum nquag ua hauj lwm kom tawm ntawm lub band.
Daim ntawv qhia HAZ Microstructure - Yuav ua li cas tshwm sim hauv Peb Cheeb Tsam
Nyob rau hauv txhua txhua 2507 weld, HAZ tsis yog ib yam. Nws yog ib qho txuas txuas ntxiv ntawm microstructures, indexed los ntawm qhov kub thiab txias. Peb lub sub-zones uas tseem ceeb:
| HAZ Sub-zone | Peak Kub | Microstructure | Failure Risk |
|---|---|---|---|
| Siab-kub HAZ (HT-HAZ) | 1250-1350℃(ze rau solidus) | Kev cog qoob loo ntau dhau; ferrite ze 100% ntawm ceev ceev; qee qhov kev hloov kho austenite | Tsawg tshaj plaws corrosion kuj nyob rau hauv qhov sib koom ua ke; ferrite-PREN zoo 28–32 ntawm no |
| Nruab nrab-kub HAZ | 950-1200 degree | Ib nrab nplej refinement; ferrite- austenite tshuav nyiaj li cas ze rau 50/50 | Txaus siab rau kev pabcuam feem ntau |
| Tsawg-kub HAZ (LT-HAZ) | 600-950 degree | Sigma-kev pheej hmoo nag lossis daus yog tuav 60 - 600 vib nas this | Embrittlement; poob ntawm Charpy cuam tshuam; pitting susceptibility |
HT-HAZ yog qhov chaw ntsiag to tsis ua haujlwm. Tom qab vuam, nws zoo li sib npaug hauv lub tshuab ntsuas ntsuas - tab sis nws qhov kev tiv thaiv corrosion yog ntsuas qis dua lub hauv paus hlau vim tias qhov loj -grained ferrite theem muaj qis dua PREN dua li lub hauv paus wrought. Hauv kev pabcuam chloride saum 40 degree, HT-HAZ yog qhov pib pitting.
LT-HAZ yog qhov qeeb-embrittlement cheeb tsam. Sigma theem yuav siv sij hawm 60 vib nas this los nucleate nyob rau hauv 2507 ntawm 850℃- uas suab ceev, tab sis nws yog qeeb piv rau weld txias tus nqi. Yog hais tias qhov kub ntawm qhov sib cuam tshuam tau nce siab tshaj 150℃thiab cov seem yog tuab txaus los tuav cov cua sov, LT-HAZ tuaj yeem khaws cov sigma ntau dhau ntawm cov cua sov. Qhov cuam tshuam Charpy ntawm -46℃poob los ntawm 200 J hauv lub hauv paus hlau mus rau 60-80 J hauv sigma{15}}cov kabmob LT-HAZ. Qhov ntawd yog qhov sib txawv ntawm kev dhau mus thiab ua tsis tiav NORSOK M-630 subsea kev tsim nyog.
Lub vuam hlau nws tus kheej (WM) pib ntawm 100% ferrite ntawm cov kua (1600 degree) thiab hloov kho austenite thaum lub caij txias txog 1200 - 800 degree. Yog hais tias qhov txias txias los ntawm qhov ntau yam no ceev (siab kub input + tuab seem=qeeb txias), austenite tsis tau txais sij hawm txaus los hloov kho thiab cov vuam nyob twj ywm tooferritic. Yog hais tias qhov txias txias yog ceev heev (tsawg tshav kub input + nyias seem=ceev ceev), austenite hloov dua siab tshiab yog suppressed thiab Cr2N nitrides hloov. Ob qho tag nrho coj tus lej ferrite tawm ntawm 35-65% lub hom phiaj.
WPS tswj tau dab tsi: cov khoom siv hluav taws xob cua sov (teeb tsa tus nqi cua txias), qhov ntsuas kub sib txawv (teeb tsa lub voj voog thermal), thiab preheat (feem ntau tsis xav tau rau 2507 hauv qab 50 hli phab ntsa; siab tshaj 50 hli, max 100℃preheat kom tsav tawm noo noo).
Dab tsi WPS tsis tswj: HAZ microstructure uas tshwm sim. Qhov ntawd yog dab tsi cov txheej txheem kev tsim nyog xeem (PQR) thiab ASTM A923 pov thawj yog rau.
ASTM A923 - Peb txoj hauv kev los txheeb xyuas qhov Weld koj tau txais
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 Nws muaj peb txoj hauv kev (A, B, C), thiab txhua tus saib rau qhov teeb meem sib txawv:
| Txoj kev | Kuaj | Dab tsi Nws Catch | Pass Criterion | Thaum Yuav Tsum Tau |
|---|---|---|---|---|
| Txoj Kev A | Etch hauv 40% NaOH, electrolytic ntawm 1 - 3 V; tshuaj xyuas ntawm 10 – 30 × rau grain - ciam teb nres | Sigma thiab chi theem hauv vuam thiab HAZ | Tsis muaj cov qoob loo txuas ntxiv - ciam teb nres ntawm ib qho qauv | Tag nrho 2507 welds rau qaub kev pab cuam los yog chloride saum 40 degree |
| Txoj kev B | Charpy V-qhov cuam tshuam ntawm -46℃ntawm vuam thiab HAZ cov qauv | Embrittlement los ntawm sigma, chi, los yog alpha-prime (475 degree) | Ntau dua lossis sib npaug li 54 J qhov nruab nrab ntawm peb cov qauv ntawm cov hlau vuam; Ntau dua lossis sib npaug rau 54 J ntawm HAZ cov qauv | Subsea, cryogenic, qaub pab |
| Txoj kev C | ASTM G48 Method Ib qho kev sim pitting ntawm 40 degree, 24 teev, ntawm daim coupon weld | Weld hlau pitting kuj (PREN poob) | Tsis muaj pitting ntawm 20 × magnification; yuag poob <0.001 g / cm² | Sour H2S kev pabcuam, siab -chloride subsea |
Txoj Kev A yog qhov pheej yig tshaj plaws thiab ceev tshaj plaws - nws tuaj yeem ua tiav hauv chav kuaj hauv ob teev. Nws ntes tag nrho sigma- theem teeb meem. Yog Txoj Kev A qhia cov nplej- ciam teb nres, qhov vuam raug tsis lees paub thiab WPS yuav tsum tau rov ua dua - tsim nyog.
Txoj Kev B yog qhov kev sim cuam tshuam - thiab nws yog ib qho uas feem ntau raug suav hais tias yog hom tsis ua haujlwm. Ib qho weld uas dhau Txoj Kev A kuj tseem yuav ua tsis tiav Txoj Kev B vim tias qhov cuam tshuam lub zog yog rhiab rau alpha- nag lossis daus loj (lub 475℃embrittlement uas tsim ntau lub hlis hauv kev pabcuam). Rau kev pabcuam subsea, Txoj Kev B yog qhov tsis yog -kev sib tham.
Txoj Kev C yog qhov kev ntsuam xyuas corrosion - nws yog qhov kim tshaj plaws thiab qeeb tshaj plaws (24-teev so + kuaj), tab sis nws tsuas yog ib qho ncaj qha ntsuas qhov vuam yuav ua li cas hauv kev pabcuam chloride. Yog tias PREN_W ntawm koj qhov muab tub lim yog 36 (vim tias koj siv ER2209 yuam kev), Txoj Kev C yuav ntes nws. Txoj Kev A yuav plam nws. Txoj Kev B yuav plam nws.
Txoj cai siv tau rau kev pabcuam subsea thiab qaub: xav tau tag nrho peb Txoj Kev ntawm txhua daim coupon tsim nyog. Yuav Tsum Tau Txoj Kev A thiab Txoj Kev B ntawm txhua qhov kev tsim khoom vuam (lossis tsawg kawg ntawm kev ua qauv hauv ASME Tshooj IX). Hla Txoj Kev C nkaus xwb yog tias qhov kev pabcuam tsis yog -corrosive thiab vuam yog lub khw tsim khoom nkaus xwb.
PWHT - Ib Txoj Kev Kho Koj Tsis Ua ntawm 2507
Qhov no yog luv luv, thiab nws yog qhov txhaum cai tshaj plaws nyob rau hauv 2507 fabrication. Post-weld heat treatment (PWHT) nyob rau hauv 600 - 950℃ntau precipitates sigma theem nyob rau hauv 2507 welds thiab HAZ. Nws yog qhov ntxeev ntawm qhov koj xav tau. Lub weld yuav tsum tau txias sai heev los ntawm qhov ntau, tsis tuav hauv nws.
Yog tias koj tus neeg tsim khoom thov PWHT rau ib qho2 507v ua- txhawm rau txo qis kev ntxhov siab, kom "stabilize" microstructure, lossis vim tias tib lub cub tawg yog siv rau cov pa roj carbon steel thiab lawv muaj lub voj voog khiav - nres qhov kev txiav txim thiab rov ua dua - tsim nyog WPS. PWHT ntawm 2507 tsis yog xaiv tau. Nws yog kev puas tsuaj.
Kev kho cua sov nkaus xwb uas tau txais ntawm 2507 welds yog ib qho re- kev daws teeb meem ntawm 1050 - 1100℃tom qab los ntawm dej nrawm. Qhov no yog ua tiav ntawm lub zeb ntawm lub phaj lossis cov yeeb nkab, tsis yog nyob rau hauv qhov chaw tom qab vuam. Ib daim teb re-kev daws teeb meem tsis zoo (koj tsis tuaj yeem tso 6-inch field weld nyob rau hauv lub cub tawg). Yog li WPS tau tsim los tsim qhov tseeb microstructure ntawm thawj qhov txias - thiab yog li ntawd yog vim li cas cov cua kub nkag thiab cuam tshuam cov qhov rais tseem ceeb heev.
Tsob Ntoo Txiav Txim Siab Filler - Xaiv txoj cai hauv 30 vib nas this
Siv tsob ntoo no los xaiv tus muab tub lim rau 2507 weld ua ntej koj qhib ib phau ntawv muab tub lim:
| Koj Qhov Kev Pabcuam | Filler siv | Vim li cas |
|---|---|---|
| Subsea flowline los yog jumper, seawater, 5 - 50 degree | TIAB SA 2594 | Tshaj dhau PREN_W 44; nitrogen- nplua nuj; dhau A923 Txoj Kev A + B + C |
| Subsea flowline nrog qaub H2S siab tshaj 0.05 psi ib nrab siab | TIAB SA 2594(yuav tsum tau) | Tsuas yog muab tub lim uas tsis tu ncua dhau NACE MR0175 hardness txwv ntawm HAZ |
| Sab saum toj piping, seawater txias, ambient kub | TIAB SA 2553 | Sib npaug PREN_W 40; pheej yig dua ER2594; txais tau rau kev pabcuam tseem ceeb tsawg |
| Khw fabrication ntawm siab hlab ntsha los yog tank, atmospheric raug | TIAB SA 2553 | Cov muab tub lim sib phim, tsim nyog rau khw- tsuas yog siv xwb |
| Koom nrog 2507 txog 316L (dissimilar weld) | ER309 LMO(nrog kev txwv) los yogERNiCrMo-3(Inconel 625 muab tub lim) | 309LMo rau khw-tsuas yog; 625 muab tub lim rau txhua qhov kev pabcuam |
| Koom nrog 2507 rau carbon steel | ERNiCrMo-3(Inconel 625 muab tub lim) | Txuj kev sib txawv ntawm kev siv vuam; nickel muab tub lim tswj lub dilution |
Yog tias koj cov lus teb rau "qhov twg muab tub lim" yog "ER2209 vim tias lub khw muaj nyob rau hauv Tshuag" lossis "ER309LMo vim tias tus neeg tsim khoom ib txwm siv nws" - koj muaj qhov muab tub lim tsis raug, thiab qhov vuam yuav ua tsis tiav ASTM A923 Txoj Kev C yog tias koj sim nws.
FAQ
Dab tsi yog qhov txawv ntawm ER2594 thiab ER2553 rau vuam 2507?
Ob leeg yog nitrogen- txhim kho duplex fillers tsim rau 2507. ER2594 yog overmatched (PREN_W ~ 44 vs base hlau 42), nrog nitrogen ntau dua (0.25 - 0.30%) los them rau qhov poob arc. ER2553 yog sib npaug (PREN_W ~ 40, nitrogen 0.20 - 0.25%). Siv ER2594 rau subsea, qaub H2S, thiab txhua qhov kev pabcuam chloride tseem ceeb. Siv ER2553 rau lub khw tsim khoom ntawm cov khoom siv tseem ceeb tsawg uas qhov kev txuag nqi tseem ceeb.
Kuv puas tuaj yeem siv ER2209 rau vuam 2507?
No. ER2209 yog qhov tseeb muab tub lim rau duplex 2205 (S32205), nrog PREN_W ~ 36. Siv nws ntawm 2507 lub hauv paus hlau muab qhov sib txuas nrog cov ntsiab lus ferrite siab tshaj 65% thiab Cr2N nitride txaus ntshai. Lub vuam yuav ua tsis tiav ASTM A923 Txoj Kev A (cov nplej- ciam teb nres pom tom qab etch). Siv ER2594 lossis ER2553 ntawm 2507.
Dab tsi yog qhov cua sov input range rau 2507 vuam?
0.5 txog 2.5 kJ / mm rau ASME Tshooj IX tsim nyog ntau yam, nrog rau nruj ntau lawm teeb -point ntawm 0.8 mus rau 1.5 kJ / mm. Hauv qab 0.5 kJ / mm, ferrite tshaj thiab Cr2N nitride txaus ntshai. Tshaj 2.5 kJ / mm, sigma theem kev pheej hmoo hauv HAZ. Siv cov txheej txheem tsim khoom- taw tes, tsis yog qhov tsim nyog, hauv WPS.
Ua li2 507v uaxav tau PWHT?
No. PWHT nyob rau hauv lub 600 - 950℃ntau precipitates sigma theem nyob rau hauv 2507 welds thiab HAZ. Lub weld yuav tsum tau txias sai heev los ntawm qhov ntau. Yog tias koj tus neeg tsim khoom thov PWHT rau 2507, nres qhov kev txiav txim. Kev kho cua sov tsuas yog siv tau yog re-kev daws teeb meem ntawm 1050 - 1100℃nrog cov dej nrawm nrawm, ua tiav ntawm lub zeb.
ASTM A923 Txoj Kev A ua tau zoo li cas?
Txoj kev A electrolytically etches polished weld cross-section nyob rau hauv 40% NaOH ntawm 1 – 3 V rau 5 – 10 vib nas this, ces kuaj nws ntawm 10 – 30 × magnification rau grain - ciam teb nres. Kev tawm tsam tsis tu ncua raws cov ciam teb qhia tau hais tias sigma lossis chi theem nag lossis daus hauv qhov vuam lossis HAZ. Daim coupon dhau los qhia tau hais tias cov kab lis kev cai huv si uas tsis muaj qhov nyiam tawm tsam.
Dab tsi ferrite tus naj npawb tau txais hauv 2507 weld?
35 - 65% ferrite los ntawm ASTM E562 (Feritscope lossis magnetic method) lossis los ntawm WRC-1992 daim duab xam. Hauv qab 35%, lub vuam poob lub zog thiab corrosion kuj lub ferrite theem muab. Tshaj li 65%, qhov vuam ua nkig thiab Cr2N nitride nag lossis daus yog qhov txaus ntshai. Qhov 50/50 cais yog lub hom phiaj.
Ntev npaum li cas lub welded 2507 yeeb nkab kav ntev npaum li cas hauv kev pabcuam subsea?
Rau Marjan -chav dej hiav txwv kev pabcuam (chlorinated seawater txhaj tshuaj ntawm 40 degree, tsim lub neej 25 xyoo), ib qho zoo welded 2507 flowline nrog ER2594 muab tub lim, cua sov input 0.8 - 1.5 kJ / mm, ferrite 35 - 65%, thiab dhau ASTM A9 + A23 Meter life. Kev siv tsis raug welded 2507 (cov muab tub lim tsis raug, cov khoom siv hluav taws xob siab, tsis muaj kev pov thawj A923) tau pom zoo rau lub qhov dej hauv 3 - 7 xyoo hauv tib qhov kev pabcuam.
Xav tau ib tug 2507 yeeb nkab los yog prefabricated spool nrog weld chemistry, ferrite tshuav nyiaj li cas, thiab ASTM A923 pov thawj uas ua tau dhau qhov thib peb - tog soj ntsuam?
HUITONG muab UNS S32750 yeeb nkab thiab prefabricated spools rau ASTM A790 / A928 nrog ASME Tshooj IX- tsim nyog WPS, ER2594 / ER2553 muab tub lim (tsis muaj 309LMo lossis ER2209), cov khoom siv hluav taws xob 0.8 - J / 1.5mm{100% ntau lawm 35 - 65% rau ASTM E562, thiab ASTM A923 Txoj Kev A + B + C ntawm txhua daim coupon tsim nyog. Xa koj lub sijhawm ua yeeb yaj kiab, cov kev pabcuam (chloride, H2S ib nrab siab, qhov kub thiab txias), thiab yuav tsum tau muaj NDE raumarket@htpipe.comlos yog WhatsApp+86-19339900201- thiab yog tias koj tsis paub meej tias 2507 yog qib zoo lossis seb ER2594 vs ER2553 yog tus muab tub lim zoo rau koj qhov kev pabcuam, qhia rau peb qhov kev pabcuam thiab peb yuav qhia koj yam tsawg kawg nkaus - tus nqi sib xyaw ua ke uas dhau mus.
