Standard thiab Npaj Kev Pabcuam
ASTM A333 Qib 4 yog qib carbon steel npog los ntawm ASTM A333, cov lus qhia tshwj xeeb rau seamless thiab welded steel yeeb nkab rau qis - kev pabcuam kub. Tus qauv tsim los ntawm ASTM, American Society for Testing and Materials, thiab cov khoom yog tsim los ntawm seamless thiab welded daim ntawv. Qib 4 yog tsim los rau cov cheeb tsam cryogenic, feem ntau ua haujlwm rau cov kav dej hauv thaj tsam ntawm -45 txog -50 degrees C, xws li liquefied natural gas cia thiab tsheb thauj mus los, tshuaj refrigerant thauj thiab khoom siv cryogenic.
Tshuaj muaj pes tsawg leeg
| Element | Cov ntsiab lus | Lub luag haujlwm |
|---|---|---|
| Cov pa roj carbon (C) | 0.30% max | Tswj kom sib npaug zog thiab toughness |
| Manganese (Mn) | 0.50% txog 1.35% | Txhim kho hardenability thiab qis -kub los tiv thaiv |
| Lwm tus | Kuaj chromium, molybdenum, tooj liab | Txhim kho corrosion kuj thiab qis -kub stability |
Cov muaj pes tsawg leeg khaws cov khoom siv weldable thaum khaws cov toughness txaus ntawm sub-zero kub. Qhov sib ntxiv ntawm manganese yog tus yuam sij rau kev cuam tshuam kev ua haujlwm xav tau los ntawm qib.
Mechanical Properties
| Parameter | Kev xav tau |
|---|---|
| Tensile zog | 415 MPa min |
| Yield zog | 240 MPa min |
| Elongation | 30% min |
| Tsawg- kub cuam tshuam toughness | Yuav tsum xeem dhau Charpy impact test ntawm -50 degrees C |
Kev ntsuas Charpy ntawm qhov tsim qis qis yog qhov kev txiav txim siab rau cov kav dej cryogenic: nws paub tseeb tias cov khoom tsis ua rau qhov kev pabcuam.
Kev tsim khoom thiab cov ntawv
ASTM A333 Qib 4 yeeb nkab tuaj yeem tsim ua cov yeeb nkab seamless lossis ncaj nraim -seam welded yeeb nkab. Rau cov yeeb nkab welded, lub vuam yuav tsum ua tau raws li qhov qis- qhov kub thiab txias ua haujlwm raws li cov hlau puag, uas ib txwm yuav tsum tau tswj cov txheej txheem vuam thiab tom qab- vuam cov cua sov. Tus me nyuam tus mob yog feem ntau normalized, uas refines lub grain qauv thiab txhim kho toughness. Muaj qhov ntev ntev los ntawm cov kab me me ntawm ob peb puas millimeters mus rau qhov loj diameters siab tshaj 3000 hli, txhawb kev tsim kho rau cov tso tsheb hlau luam thiab cov kab.
Daim ntawv thov Scenario
Liquefied natural gas (LNG) pipelines rau thauj -50 degrees C chav kawm cryogenic media.
Chemical refrigerant systems, xws li ethylene thiab propylene low -kub kua kab.
Cov khoom siv hluav taws xob thiab lub zog, suav nrog cov khoom siv hluav taws xob cryogenic thiab txhawb cov yeeb nkab fittings.
Cryogenic cia thiab cov txheej txheem chav nyob qhov twg cov kav dej yuav tsum nyob twj ywm ntawm qhov tsawg kawg nkaus tsim kub.
Qib sib piv: Qib 4 vs Qib 1 vs Qib 6
| Khoom | Qib 4 | Qib 1 | Qib 6 |
|---|---|---|---|
| Tsim kub | -45 rau -50 ° C | -195 ° C ntxiv-tsawg kub | -45 ° C zoo tib yam tsis tshua muaj kub |
| Qhov tseem ceeb alloying | Chromium, molybdenum, tooj liab | Nickel{0}} muaj | Nickel{0}}dawb, nrog chromium thiab molybdenum |
| Tus nqi txheeb ze | Nruab nrab | Siab, vim yog cov ntsiab lus nickel | qis |
Qib 1 yog qib workhorse rau qhov kub qis heev vim nws cov ntsiab lus npib tsib xee, thaum Qib 6 yog qhov qis dua - tus nqi xaiv rau nruab nrab qis - qhov kub thiab txias. Qib 4 zaum nruab nrab ntawm lawv thiab xaiv qhov twg nws cov khoom sib xyaw ua ke thiab tus nqi haum rau qhov ntsuas kub.
Kev Ntseeg Tsis Zoo
Qib 4 tsis raug ntsuas rau -195 ° C. Nws qhov kev tsim ntau yog li -45 txog -50 ° C; Cov kev pabcuam txias yuav tsum muaj cov nickel-cov kabmob xws li Qib 1 lossis stainless hlau.
A333 tsis yog stainless hlau. Nws yog cov pa roj carbon thiab qis- alloy steel nrog kev tswj kev cuam tshuam rau qhov kub thiab txias.
Normalizing tsis yog xaiv rau cov yeeb nkab cryogenic. Nws yog tus txheej txheem xa khoom uas muab cov qoob loo uas yuav tsum tau ua kom zoo thiab toughness.
Welded A333 yeeb nkab tsis tuaj yeem tsis muaj zog dua li seamless. Nrog cov txheej txheem vuam tsim nyog thiab tom qab-weld kev kho mob, thaj chaw vuam ua tau raws li qhov yuav tsum tau ua.
FAQ
A333 Gr4 khoom yog dab tsi?
A333 Gr4 yog qib carbon steel hauv ASTM A333 rau seamless thiab welded yeeb nkab siv nyob rau hauv qis kub, nrog rau kev tsim ntau yam ntawm -45 txog -50 degrees C.
Qhov kub ntau npaum li cas yog A333 Qib 4 haum rau?
Qib 4 yog tsim los rau cov kev pabcuam cryogenic nyob ib puag ncig -45 txog -50 degrees C, xws li LNG thiab chemical refrigerant kab.
Qhov txawv ntawm A333 Qib 1, 4 thiab 6 yog dab tsi?
Qib 1 yog npib tsib xee- qib bearing ntxiv rau- qis qis qis mus txog li -195 degrees C, Qib 6 yog npib tsib xee- qib pub dawb txog li -45 degrees C, thiab Qib 4 muaj kev xaiv nruab nrab tus nqi rau -45 txog -50 degrees C.
A333 Qib 4 yeeb nkab puas tuaj yeem welded?
Yog lawm, nws tuaj yeem tsim ua seamless lossis ncaj -seam welded yeeb nkab. Vuam yuav tsum ua raws li cov txheej txheem tsim nyog kom lub vuam cheeb tsam ua tau raws li qhov qis dua - qhov kub thiab txias yuav tsum tau ua raws li cov hlau puag.
Dab tsi yog qhov kev xa khoom ntawm A333 Qib 4 yeeb nkab?
Cov yeeb nkab yog ib txwm nkag mus rau normalized los kho cov qauv nplej thiab txhim kho qis -kub toughness.
A333 Qib 4 yeeb nkab siv nyob qhov twg?
Nws yog siv nyob rau hauv LNG cia thiab thauj piping, tshuaj refrigerant systems xws li ethylene thiab propylene kab, cryogenic tshav kub exchangers thiab qis - kub lub zog thiab lub zog khoom.