ASTM B 423 3yog tus qauv specification rau seamless nickel{0}}hlau-chromium-molybdenum- tooj liab alloy yeeb nkab thiab raj, tsim UNS N08825. ASME tus khub yog SB-423, tau txais yuav rau hauv Boiler thiab Pressure Vessel Code. Yog tias koj qhov project poob rau hauv ASME siab piping lossis lub nkoj txiav txim siab - uas nws yuav yog tias koj tab tom tsim ib yam dab tsi hauv roj thiab roj, tshuaj lom neeg, lossis kev pabcuam nuclear hauv feem ntau cov cheeb tsam - koj qhia SB-423. Rau cov ntawv tsis-code, B423 yog lub hauv paus specification.
B423 tsuas yog seamless. Welded Alloy 825 yeeb nkabpoob rau hauv ASTM B705 (longitudinal weld) rau txoj kab uas hla loj dua, thiab welded raj nyob rau hauv ASTM B704 rau kev sib hloov hluav taws xob thiab kev siv ntsuas. Cov no tsis tuaj yeem hloov pauv hauv kev pabcuam siab. Yog tias koj tus neeg siv khoom siv cov kav dej hais tias "B423," koj tsis tuaj yeem hloov B705 - txawm tias cov chemistry, phab ntsa thickness, thiab txoj kab uas hla zoo ib yam - vim hais tias lub hauv paus siab code thiab kev ruaj ntseg zoo sib txawv.
B423 npog ib lub npe UNS: N08825.Tsis zoo li B444 (uas npog ob qho tib si N06625 thiab qhov tsis tshua muaj - tsim N06219), B423 ncaj nraim - tsuas muaj ib qib alloy xwb. Tab sis txheeb xyuas tus lej UNS ntawm txhua daim ntawv pov thawj zeb xeem lawm. Peb tau pom MTCs uas hais txog tus lej tus qauv raug tab sis sau cov UNS tsis raug, feem ntau yog kev ua haujlwm yuam kev ntawm lub zeb, tab sis txaus los ua tsis tiav daim ntawv tshuaj xyuas nrog tus neeg soj ntsuam thib peb - tog.
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.
Lwm yam specifications koj yuav tsum paub
| Specification | Yam khoom | Thaum Nws Siv |
|---|---|---|
| ASTM B423 / ASME SB-423 Cov khoom siv | Seamless yeeb nkab thiab raj | Siab piping, downhole tubing, txheej txheem kab |
| ASTM B705 / ASME SB-705 Cov Lus Qhia | Welded yeeb nkab (longitudinal) | Loj - txoj kab uas hla txoj kab uas hla seamless yog tsis muaj los yog raug nqi - txwv tsis pub |
| ASTM B704 / ASME SB-704 Cov Lus Qhia | Welded raj | Kub exchanger tubing, instrumentation tubing |
| ASTM B163 | Seamless condenser thiab kub exchanger raj | Plhaub-thiab- tube exchangers, condensers |
| ASTM B829 Cov khoom lag luam | Cov kev cai dav dav rau nickel alloy yeeb nkab | Cov kev xav tau ntxiv, kev sim, qhov ntev |
| ASTM B425 / ASME SB-425 Cov khoom siv | Bar thiab forging | Flanges, fittings, forged Cheebtsam txuam cov yeeb nkab qib |
| ASTM B424 / ASME SB-424 | Phaj, ntawv, strip | Cov yeeb nkab fittings fabricated los ntawm phaj, clad phaj substrate |
Lub Hom Phiaj: Txhua Yam Ua Li Cas thiab Vim Li Cas Nws Tseem Ceeb rau Koj Qhov Kev Pabcuam
Alloy 825's composition tsis yog random - txhua lub caij ua haujlwm tshwj xeeb, thiab kev nkag siab txog cov haujlwm no yog dab tsi cais cov lus qhia zoo los ntawm daim ntawv theej - muab tshuaj txhuam ib qho.
| Lub ntsiab | Cov ntsiab lus (wt%) | Lub luag haujlwm hauv Kev Pabcuam |
|---|---|---|
| Nickel | 38.0–46.0 (typ. ~ 42) | Austenitic stability; chloride kev nyuaj siab corrosion cracking kuj; lub hauv paus rau txo -acid resistance |
| Chromium | 19.5–23.5 (ntev. ~ 21.5) | Passive Cr₂O₃ zaj duab xis; oxidizing acid thiab siab -kub oxidation kuj |
| Hlau | 22.0 min (sib npaug, ntaus ntawv ~ 30) | Kev tswj tus nqi; tswj cov qauv austenitic; txo thermal expansion vs tag nrho cov nickel alloys |
| Molybdenum | 2.5–3.5 (typ. ~ 3.0) | Pitting thiab crevice corrosion kuj nyob rau hauv ib puag ncig chloride; txo -acid resistance |
| Tooj | 1.5–3.0 (typ. ~ 2.2) | Cim rau 825 ntawm cov nickel alloys- sulfuric thiab phosphoric acid tsis kam; hydrofluoric acid kam rau ua |
| Titanium | 0.6–1.2 (typ. ~ 0.9) | Stabilization - khi li carbon li TiC, tiv thaiv rhiab heev thiab intergranular corrosion tom qab vuam |
| Cov pa roj carbon | 0.05 max | Tsawg carbon khaws Ti muaj rau stabilization |
| Manganese | 1.0 max | Deoxidizer; kub ua haujlwm |
| Silicon | 0.5 max | Weldability tswj |
| Sulfur | 0.03 max | Kub workability - qis dua yog zoo dua rau seamless tho |
| Aluminium | 0.2 max | Tsawg deoxidizer; tswj kom tsis txhob Al₂O₃ suav nrog |
Mechanical Properties thiab lawv txhais li cas rau Phab ntsa Thickness xam
| Khoom | B423 yuav tsum tau (Annealed) | Tej yam khoom muaj nqis |
|---|---|---|
| Tensile zog (min) | 586 MPa (85 ksi) | 655-690 MPa |
| Yield zog 0.2% (min) | 241 MPa (35 ksi) | 290-310 MPa |
| Elongation hauv 50mm (min) | 30% | 38-45% |
| Hardness (max) | 200 HB / 90 HRB | 160-180 HB |
| Qhov ntom | 8.14 g / cm³ | - |
| Melting ntau | 1370-1400 degree | - |
| Modulus ntawm elasticity | 196 GPa (28.4 × 10⁶ psi) | - |
| Thermal conductivity (20 degree) | 11.1 W/m·K | - |
| Coefficient ntawm thermal expansion (20-100 degree) | 14.0 × 10⁻⁶ / degree | - |
| Hluav taws xob resistivity | 1.13 μΩ·m | - |
Lub zog yield ntawm 241 MPa (35 ksi) yog me me - qis dua 316L (205 MPa yog qhov tsawg kawg nkaus spec, tab sis raug 316L seamless khiav 260-290 MPa) thaum koj saib ntawm cov khoom tsis zoo li qhov tsawg kawg nkaus, thiab qis dua Alloy 625 MPa 1 (). Qhov no txhais tau tias 825 yeeb nkab phab ntsa yuav tuab dua 625 rau tib lub siab tsim.
Rau 6-nti (168.3mm OD) yeeb nkab ntawm 150 bar tsim siab, siv ASME B31.3 tso cai rau kev ntxhov siab:
alloy 825(SB-423, annealed): tso cai rau kev ntxhov siab ~ 138 MPa ntawm 200℃→ xam phab ntsa thickness ~ 14.2mm → Sch 80 (15.1mm) los yog Sch 160 (18.2mm) nyob ntawm corrosion pub
alloy 625(SB-444, Qib 1): tso cai kev ntxhov siab ~ 184 MPa ntawm 200℃→ xam phab ntsa thickness ~ 10.6mm → Sch 60 (11.1mm) los yog Sch 80 (15.1mm)
Cov yeeb nkab 625 tuaj yeem siv lub sijhawm sib zog - Sch 60 vs Sch 80 - vim tias nws lub zog tawm los yog 72% siab dua. Tab sis 625 seamless yeeb nkab nqi 70-110/kgversus825at70-110/kgversus825at45-70/kg. Txawm hais tias cov phab ntsa nyias nyias them rau tus nqi siab dua ib kg yog nyob ntawm qhov loj me thiab lub sijhawm.
Rough economics rau 6-nti yeeb nkab, 150 bar, 200 degree:
825 Sch 80: ~ 88 kg/m × 55/kg= 55/kg= 4,840/m
625 Sch 60: ~ 65 kg/m × 90/kg= 90/kg= 5,850/m
Hauv qhov no, 825 tseem pheej yig dua txawm tias cov phab ntsa hnyav dua - tab sis qhov sib txawv ntawm qhov siab dua thiab cov kab loj dua qhov twg 625 lub zog kom zoo dua. Ntawm 250 bar lossis 12-nti NPS, kev suav tuaj yeem tig. Khiav tus lej rau koj qhov kev tsim qauv tiag tiag ua ntej defaulting rau ob qho tib si alloy.
Qhov twg 825 Yeej thiab Qhov twg 625 Yuav Tsum Tau
Qhov no yog lub tswv yim kev yuav khoom uas tsis muaj leej twg tshaj tawm, vim tias cov neeg muag khoom xav muag koj cov khoom kim dua. Nov yog:
Nyob rau feem ntau cov roj thiab roj thiab cov dej num tshuaj uas xav tau nickel alloy yeeb nkab,alloy 825tuaj yeem tswj tau 70-80% ntawm cov kev pabcuam uas Alloy 625 tau teev tseg rau - ntawm 50-60% ntawm tus nqi.
Qhov seem 20-30% tiag tiag xav tau 625. Qhov ua kom yuam kev yog paub qhov twg 20-30%.
Thaum 825 Yog Qhov Kev Xaiv Tau Zoo (thiab 625 Yog Kev Siv Tsis Txaus Siab)
| Kev Pabcuam | Vim li cas 825 Ua Haujlwm | 625 Yuav yog: |
|---|---|---|
| Cov roj qaub sib sau ua ke, H₂S Tsawg dua lossis sib npaug rau nruab nrab ib nrab siab, T < 150 degree | NACE MR0175 tsim nyog; txaus SCC tsis kam; Cu pab nrog acid gas condensate | Tsis tsim nyog - 2× tus nqi tsis muaj kev pab cuam |
| Sulfuric acid piping, tag nrho cov concentrations, T Tsawg dua los yog sib npaug rau 80 degree | Cu ntxiv muab qhov zoo tshaj H₂SO₄ tsis kam vs 625 | Ua rau mob hnyav dua hauv qhov chaw tshwj xeeb no |
| Phosphoric acid cog piping thiab evaporators | Mo + Cu ua ke ua kom zoo rau H₃PO₄ | Cov txiaj ntsig marginal, 2 × nqi |
| Seawater heat exchangers, T Tsawg dua los yog sib npaug li 40 degree | Tsim nyog pitting kuj (CPT ~ 25-30℃hauv dej hiav txwv) | Zoo dua tab sis overkill ntawm qhov kub no |
| Cov kab mob tshuaj, cov tshuaj chloride + cov kua qaub sib tov | Sib npaug tiv thaiv oxidizing thiab txo hom | Overspecified rau lub luag haujlwm |
| Flue gas desulfurization (FGD) slurry kab | Tiv thaiv SO₂ / SO₃ acid condensate + chloride; Ti stabilization tuav weld HAZ | Overspecified - 825 yog tus qauv kev lag luam rau FGD |
| Downhole tubing, nruab nrab -qhov tob qaub qhov dej | NACE tsim nyog; txaus rau qhov tob qhov twg T <150℃thiab H₂S ib nrab siab yog nruab nrab | Xav tau tsuas yog rau qhov tob, siab -T, siab -H₂S qhov dej |
Thaum 625 Yuav Tsum Tau Ua (thiab 825 Yuav Ua Tsis Tau Ua Ntej)
| Kev Pabcuam | Vim li cas 825 Fail | 625 Yuav tsum tau vim: |
|---|---|---|
| Dej hiav txwv siab tshaj 40-50 degree | 825 CPT (~ 25-30 degree) tshaj → pitting pib | 625 CPT ~ 85℃- cov npoo loj |
| Cov dej sib sib zog nqus, T> 150 degree, siab H₂S ib nrab siab | 825 qhov qis Mo thiab Ni tsis txaus thaum muaj xwm txheej hnyav | 625's siab Mo (8-10%) thiab Ni (58% min) muab cov paj laum |
| Subsea flowlines thiab jumpers nrog dynamic loading | 825 yield zog tsawg dhau rau siab -siab dynamic kev pab cuam | 625 Qib 1 tawm los 414 MPa - 72% muaj zog dua |
| Siab - dej hiav txwv ceev (tso tawm, impingement) | 825's qis dua PREN → yaig-corrosion ntawm siab khiav ceev | 625's PREN ~ 51 thiab siab dua Mo → yaig-corrosion pib ntau dua |
| Concentrated HCl los yog tov kua qaub pab ntawm qhov kub siab | 825's Mo cov ntsiab lus tsis txaus rau kub txo cov kua qaub | 625's siab Mo (8-10%) thiab siab dua Ni muab kev tiv thaiv; los yog nce mus rau C-276 |
| Kev pabcuam kub> 540 degree | 825's Ti stabilization yuav tsis ruaj khov; mechanical zog poob | 625 ntsuas rau 650℃+ nrog microstructure ruaj khov |
| Siab -cov ntaub ntawv siv lub zog (bolting, fasteners hauv CRA) | 825 tawm los 241 MPa tsis txaus rau siab - kev nyuaj siab bolting | 625's 414 MPa tawm los (Qib 1) los yog hnub nyoog - hardened 718 kom muaj zog ntau dua |
Vuam thiab Fabrication: Yam Koj Lub Khw Yuav Tsum Paub
Alloy 825 feem ntau suav hais tias yog yooj yim weldable - los ntawm GTAW, GMAW, SMAW, thiab SAW - yam tsis muaj preheat thiab tsis post-weld heat treatment nyob rau hauv feem ntau cov kev pab cuam. Tab sis "ready weldable" tsis txhais hais tias "weld zoo li carbon steel." Nov yog cov kev txiav txim siab tshwj xeeb uas cuam tshuam rau kev ua haujlwm hauv cheeb tsam:
Filler Hlau Xaiv
| Hom sib koom | Pom zoo Filler | AWS Classification | Sau ntawv |
|---|---|---|---|
| 825 txog 825 (kev sib piv) | ERNiFeCr-1 (xaim) / ENiCrFe-1 (nrog electrode) | AWS A5.14/A5.11 | Sib piv chemistry; khaws Cu thiab Ti hauv weld deposit |
| 825 rau carbon steel (dissimilar) | ERNiCrMo-3 (xaim) / ENiCrMo-3 (cov electrode npog) | AWS A5.14/A5.11 | 625-hom muab tub lim; siab dua Ni thiab Mo rau kev sib koom ua ke ductility |
| 825 rau 316L / 304L stainless (dissimilar) | ERNiCrMo-3 | AWS A5.14 | 625-hom muab tub lim tiv thaiv kev tawg tawg |
| 825-625 (tsis sib xws) | ERNiCrMo-3 | AWS A5.14 | Ib txwm weld mus rau sab qis - alloy sab |
| 825 clad phaj (overlay / cladding) | ERNiCrMo-3 | AWS A5.14 | 625 muab tub lim siv los ua overlay ntawm carbon steel - tus nqi ntau-txuag mus kom ze |
Lub ntxiab:Qee lub khw ua rau ERNiCrMo-3 (625 muab tub lim) rau tag nrho 825 welds vim nws yog cov khoom siv ntau tshaj plaws nickel alloy muab tub lim thiab lawv siv rau txhua yam. Hauv kev sib piv 825-rau-825 welds, qhov no tsis yog qhov tsis ncaj ncees lawm - 625 muab tub lim yog sib xws nrog 825 lub hauv paus hlau - tab sis nws yog nkim (625 muab tub lim nqi ntau dua ERNiFeCr-1) thiab nws txhais tau hais tias cov nyiaj tso nyiaj muaj qhov sib txawv corrosion dua li lub hauv paus hlau. Hauv kev pabcuam sulfuric acid, 625 muab tub lim rau ntawm 825 yeeb nkab yuav muaj kev tiv thaiv corrosion tsawg dua li cov hlau puag ncig vim nws tsis muaj tooj liab. Lub weld dhau los ua qhov tsis muaj zog txuas.
Rau qhov kev pabcuam corrosion tseem ceeb, siv ERNiFeCr-1 sib phim muab tub lim. Rau qhov sib txawv ntawm cov pob qij txha thiab cov ntawv thov tsis tseem ceeb, ERNiCrMo-3 yog qhov siv tau thiab feem ntau nyiam rau nws qhov muaj thiab tawg tsis kam.
Interpass Temperature thiab Heat Input
Interpass kub:Qhov siab tshaj 175℃(347℃F). Qhov no yog nruj dua li carbon steel thiab feem ntau stainless qib. Siv qhov kub thiab txias -qhia cov crayons lossis hu rau pyrometers nruab nrab ntawm kev hla.
Thaum tshav kub kub input:0.5-1.5 kJ/mm yam. Cov khoom siv hluav taws xob ntau dhau ua rau thaj chaw muaj kev kub ntxhov thiab tuaj yeem tsav titanium tawm ntawm kev daws yog tias kev tiv thaiv atmospheric tsis zoo. Stringer hlaws nyiam dua weave.
Rov qab- tshem tawm:Yuav tsum tau rau corrosion-piping tseem ceeb. Argon ntawm 5-10 CFH, khaws cia kom txog thaum lub hauv paus hla yog tsawg kawg yog 3 hli tuab. Oxidized cag hla (qab zib) yuav tsum tau muab tso rau hauv av thiab rov ua dua -welded - tsis txhob tawm oxidized weld cag hauv qaub lossis acid.
Tshaj tawm -Kev txiav txim siab ntawm Fabrication
Tsis xav tau PWHTrau feem ntau cov kev pabcuam, ua tsaug rau titanium stabilization. Qhov no yog lub sij hawm thiab tus nqi kom zoo dua cov alloys uas yuav tsum tau post-weld tov annealing.
Pickling thiab passivationpom zoo tom qab fabrication kom tshem tawm weld oxides, tshav kub tint, thiab dawb hlau paug los ntawm tuav. Ib 20-25% HNO₃ + 2-5% HF da dej ntawm 40-50℃rau 15-30 feeb yog qhov zoo. Xwb, electrocleaning rau complex geometry.
PMI (Positive Material Identification):Yuav tsum tau ua rau cov haujlwm roj thiab roj. Tshawb xyuas txhua qhov spool, txhua qhov weld, txhua qhov haum. XRF (X-ray fluorescence) yog tus qauv; paub meej tias qhov ntsuas tau ntsuas rau cov nickel alloys thiab tuaj yeem paub qhov txawv ntawm 825 los ntawm 625 thiab 800 - peb cov alloys uas feem ntau tsis meej pem hauv cov chav tsev.
Xaus
Alloy 825 nyob rau hauv ib qho tshwj xeeb, zoo -txhais niche nyob rau hauv cov nickel alloy tsev neeg: nws yog cov hlau koj xaiv thaum 316L thiab duplex stainless hlau tsis tuaj yeem tuav cov kev pabcuam, tab sis 625 yog ntau tshaj li daim ntawv thov. Nws cov tooj liab ntxiv muab rau nws sulfuric thiab phosphoric acid tsis kam uas tsis muaj lwm yam nickel alloy tuaj yeem phim ntawm nws tus nqi taw tes. Nws titanium stabilization tso cai rau vuam yam tsis muaj kev tshaj tawm -weld heat treatment. Nws qhov kev tsim nyog NACE MR0175 ua rau nws xaiv tus qauv rau kev pabcuam roj qaub thiab roj thoob ntiaj teb.
Cov kev txiav txim siab yuav khoom uas tseem ceeb - seamless vs welded, 825 vs 625, khoom vs clad, sib piv vs dissimilar muab tub lim - yog tsav los ntawm kev pabcuam, cov cai, thiab kev lag luam. Tau txais cov kev txiav txim siab yog lawm, thiab koj cov yeeb nkab xaj yuav ua raws li tsim los rau qhov project tag nrho lub neej voj voog. Tau txais lawv tsis ncaj ncees lawm, thiab koj yuav overspend rau qhov tsis tsim nyog alloy (tshwj xeeb 625 qhov twg 825 txaus) los yog ua tsis tau zoo (hloov welded rau seamless, los yog siv cov hlau tsis raug rau hauv kev pabcuam corrosion tseem ceeb).
Yog tias koj tab tom qhia825 cevrau ib qhov project thiab xav tau ib tus neeg muag khoom uas nkag siab qhov txawv ntawm B423 thiab B705, leej twg nqa cov ntaub ntawv NACE kom raug, thiab leej twg tuaj yeem qhia txog kev xaiv cov hlau filler thiab clad vs solid economics - tham nrog peb. Peb muab B423 seamless yeeb nkab, B705 welded yeeb nkab, B425 forged fittings thiab flanges, thiab B424 phaj rau roj thiab roj, tshuaj, thiab offshore tej yaam num nyob rau hauv Middle East, Europe, thiab Southeast Asia.
