1. Kev cuam tshuam tawv ntawm tsawg kub
A. Qhov tseem ceeb txhawj xeeb: Zas - rau - brittle hloov
Cov Qauv Kev Ua Haujlwm:
Nyob rau hauv chav tsev kub, q460nd yog feem ntau muaj kev cuam tshuam nyuaj ntawmNtau dua los yog sib npaug rau 34 j ntawm -20 degree(Ib GB / T 4171-2008).
Tsawg - kub nyhuv:
Raws li kub ceev poob hauv qab-20 degree, Feem ntau cov khoom siv tawv txo qis vim txo qis cov tawv ncauj thiab muaj zog atomic brittleness.
Hauv qab-40 Qib, qhov kev pheej hmoo ntawm brittle bacture tau nce siab, tshwj xeeb tshaj yog nyob rau hauv welded lossis noched Cheebtsam.
B. Kev Cog Lus:
Alloy optimization:
Cov qib nrog siab duaNpib tsib caug (ni)Cov ntsiab lus (piv txwv, Q460Gnh, nrog ni ntau dua lossis sib npaug nrog 0.50%) txhim kho qis qis {4 4}} kub sab nrauv los ntawm cov theem ntsuas pa.
Ua kev kho:
Normalizing lossis quenching & Tempering(Q & T) Cov kev kho cua sov ua kom cov qauv nplej ua kom zoo nkauj, txhim kho kev nruj.
Tswj DovThaum lub sij hawm tsim kev txo cov qoob loo kom loj dua rau kev tawg zoo dua.
2. Huab cua tiv thaiv ntawm tsawg kub
A. MATINA Txoj kev tsim cov nyom:
Qeeb Oxidation:
Tsawg kub (piv txwv li,<0°C) slow down electrochemical reactions, delaying the formation of the protective rust layer (α-FeOOH).
HauvArctic Clourates, patina stabilization yuav siv3-5 xyoos(vs . 1.5 - - 2 xyoo nyob rau hauv qhov kub ntawm thaj chaw).
B. Corrosion pheej hmoo:
Khov -} thahaw cycles:
Rov ua kom khov thiab yaj tuaj yeem ua rau microcacks hauv txheej xeb, cia kev nkag siab noo noo thiab thaj chaw hauv nroog.
Kev Ntsev Tsuag:
Nyob rau hauv cov cheeb tsam dej hiav txwv txias (piv txwv li, lub teb chaws Nordic), tsib {{} iching salts (nacl) accelerate pitting yog lub patina tsis txawj ploj.
C. Txhim Kho Txoj Kev:
Ua ntej - oxidation kev kho mob:
Hoobkas -}} {tshuaj tsuag tshuaj tsuag) yuam kev tsim ua ntej kev teeb tsa.
Feem:
Kev sivsilane -} Raws li cov ntsawsTxhawm rau tiv thaiv thaj chaw tsis muaj zog (piv txwv li, txiav cov npoo, txiav cov npoo) kom txog thaum patina matures.
3. Ua ke ua tau zoo nyob rau hauv qis -} sov daim ntawv thov
| Ntiag tug | Cov nyhuv ntawm tsawg kub | Cov kev daws teeb meem |
|---|---|---|
| Kev Cuam Tshuam | Txo qis dua -20 degree; Kev pheej hmoo ntawm brittle brecure | Siv ni {- Enhanced qib (piv txwv li Q460Gnh); Thov Q & T Thaum Tshav Kub Kub Kev Kho Mob. |
| Huab Cua Kuj | Patina cov ntawv maj mam; Khov - thaws yuav puas cov txheej xeb | Pre - oxidize qhov chaw; Kev tsim qauv kom tsis txhob muaj cov dej khov. |
| Welded pob qij txha | Haz brittleness nce | Preheat cls (100-150 degree); Siv qis - hydrogen mroundorodes. |
4. Cov ntawv thov tswv yim thiab cov piv txwv
Tus Neeg Muaj Mob:
Arctic choj (piv txwv li, Norway / Lavxias): Siv ni {-} {}, wq470n) nrog cuam tshuam kev nyuaj ntau dua lossis sib npaug rau ntawm 27 j ntawm -60 degree.
Txias cia khoom: Q460nd nrog cov foob pob ntawm pob qij txha txhawm rau tiv thaiv kev ua kom hws khov kho.
Kev txwv:
Zam kev siv qauv Q460NH hauv qhov kubHauv qab -40 degreetsis muaj kev qhia nruj ntawmCharpy v - tsis txhob kuaj.
5. Cov lus pom zoo thiab kev pom zoo txij nkawm
Cov khoom siv xaiv:
Rau qhov kub ntawm-20℃rau -40 degree, qhia meejQ460Gnh(Ni {-}} ntxiv variant).
Hauv qab-40 Qib, hloov musTsawg -} Cov hlau allooyZoo rau Cryogenic Service (piv txwv li, Astm A517).
Kev coj ua Fabrication:
Tsis txhob muaj cov ntsiab lus ntsehauv kev tsim los txo kev ntxhov siab.
Post - Weld Kev Kho Cua Sov(Pwht) relieves residual kev ntxhov siab hauv cov kab tuab.
Xyuas:
Kev coj ua lub sijhawmKev Kuaj Ultrasonic (ut)rau cov kab nrib pleb hauv cov pob qij txha tseem ceeb.
