1. Core Reference Standards
ASTM B 443 3: Txheem Specification rau Nickel-Iron-Chromium-Molybdenum-Copper Alloy (UNS N09925) Seamless Yeeb Nkab thiab Tube
ASME SB 443: Boiler thiab Pressure Vessel Code, Tshooj II, Ntu A: Cov khoom siv rau Boilers thiab Pressure Vessels (sib npaug rau ASTM B443)
ASTM B 637 Cov khoom lag luam: Txheem Specification rau Nickel-Iron-Chromium-Molybdenum-Copper Alloy (UNS N09925) Qws, Bar, thiab Hlau
TS EN ISO 6208: Cov khoom siv hlau thiab cam khwb cia hlau-Kev ntsuas tensile ntawm qhov kub thiab txias (rau elongation thiab lub zog pov thawj)
2. Kev kho cua sov rau cov laus
Kev daws AnnealingKub rau 1040-1095℃(1900-2000℃F), tuav rau 30-60 feeb, cesceev quenching(dej lossis yuam cua txias) kom khaws tau homogeneous austenitic matrix.
Precipitation Hardening (Kev laus): Reheat rau 705-760℃(1300-1400℃F), tuav rau 8-12 teev, ces cua txias. Cov txheej txheem no induces tsim cov nplua '(Ni₃(Ti, Al)) thiab '(Ni₃Nb) precipitates, uas ho txhim khu lub zog yam tsis muaj kev cuam tshuam ductility.
3. Cov Lus Qhia Kom Paub Txog Cov Khoom Siv Hluav Taws Xob
3.1 Tensile Strength (σᵦ / Ultimate Tensile Strength, UTS)
Txhais: Qhov siab tshaj plaws ntawm cov khoom siv tuaj yeem tiv taus ua ntej tawg thaum lub sij hawm tensile load.
Txoj Kev XeemASTM E8 / E8M (tus qauv tensile kuaj rau cov khoom siv hlau).
Standard Requirement (yam tsawg kawg nkaus):
1100 MPa (160 ksi) [ib ASTM B443 / B637 rau hnub nyoog bar / yeeb nkab / ntawv]
Tus nqi tiag tiag (Aged Condition):
1150-1250 MPa (167-181 ksi) (nws txawv me ntsis los ntawm cov khoom siv: bar> yeeb nkab> ntawv)
Kev lag luam tseem ceeb: Qhov tseem ceeb rau kev thauj khoom-cov kabmob (piv txwv li, cov cuab yeej downhole, fasteners) nyob rau hauv siab - ib puag ncig siab, vim nws ua kom tsis muaj zog tensile tsis ua haujlwm hauv kev ua haujlwm siab.
3.2 Yield Strength (σ₀.₂ / 0.2% Offset Yield Strength)
Txhais: Qhov kev ntxhov siab uas cov khoom nthuav tawm ib qho kev deformation mus tas li ntawm 0.2% (offset txoj kev, raws li Incoloy 925 tsis qhia qhov sib txawv ntawm qhov taw tes hauv qhov kev ntxhov siab -strain nkhaus).
Txoj Kev XeemASTM E8 / E8M (Offset txoj kev suav).
Standard Requirement (yam tsawg kawg nkaus):
860 MPa (125 ksi) [ASTM B443/B637]
Tus nqi tiag tiag (Aged Condition):
900-1000 MPa (130-145 ksi)
Kev lag luam tseem ceeb: Txiav txim siab cov khoom muaj peev xwm los tiv thaiv cov yas deformation nyob rau hauv kev pab cuam loads (xws li, lub siab ntawm lub plhaub, cov qauv kev txhawb nqa). Lub zog tawm los siab txo qis kev cuam tshuam mus tas li hauv cov xwm txheej hnyav.
3.3 Elongation (δ₅ / Feem pua Elongation hauv 50mm Gauge Length)
Txhais: Qhov feem pua nce ntxiv ntawm qhov ntev ntawm cov qauv tom qab tawg, qhia txog ductility (muaj peev xwm deform plastically tsis tawg).
Txoj Kev XeemASTM E8 / E8M (50mm tus qauv ntsuas qhov ntev rau cov qauv tensile).
Standard Requirement (yam tsawg kawg nkaus):
20% ASTM B443 / B637
Tus nqi tiag tiag (Aged Condition):
22–28%
Kev lag luam tseem ceeb: High ductility yog ib qho tseem ceeb rau fabricability (piv txwv li, khoov, vuam, sib sau) thiab tiv thaiv nkig tawg nyob rau hauv dynamic los yog poob siab -loaded daim ntaub ntawv (xws li, offshore platform Cheebtsam).
3.4 Hardness
Kev lag luam tseem ceeb: Hardness correlates nrog hnav tsis kam thiab tensile lub zog. Piv txwv li, ib tug hardness ntawm 32-38 HRC ua kom durability nyob rau hauv abrasive ib puag ncig (xws li, slurry thauj kav) thaum tuav txaus ductility rau thaj chaw installation.
4. Cov yam ntxwv cuam tshuam rau cov khoom sib txawv
Daim ntawv khoom: Bar Tshuag feem ntau pom muaj zog dua (± 5% piv rau tus qauv) vim muaj cov qauv lis ntau dua; ntawv / yeeb nkab tej zaum yuav muaj marginally qis zog tab sis siab dua elongation.
Kev kho cua sov Precision: Deviations los ntawm kev laus kub (± 15 degree) los yog tuav lub sij hawm (± 2 teev) yuav hloov precipitate loj, cuam tshuam lub zog (xws li, dhau- laus txo yield zog los ntawm ~ 5-10%).
Alloy Chemistry kam rau ua: Cov kev hloov me me hauv Ti / Al cov ntsiab lus (hauv ASTM B443 txwv: Ti 2.0–2.5%, Al 0.1–0.3%) tuaj yeem cuam tshuam 'precipitate tsim, hloov lub zog los ntawm ± 3%.
5. Cov Lus Qhia Tseem Ceeb rau Kev Siv Khoom Siv
Corrosion{0}}Mechanical Synergy: Aged Incoloy 925 khaws cov tshuaj tiv thaiv zoo heev (xws li rau cov roj qaub, dej hiav txwv) nrog rau lub zog siab - zam dhau 200℃hauv kev pabcuam, vim tias qhov ntev ntev tuaj yeem ua rau dhau - kev laus thiab lub zog poob.
Weldability: Post-weld heat treatment (PWHT) yog yuav tsum tau los kho cov khoom laus hauv cov cheeb tsam welded; ua raws AWS D10.9 rau cov kev pom zoo PWHT (705℃/ 8 teev).
