ASTM A333 Qib 8 yog dab tsi?
ASTM A333 Qib 8 yog seamless thiab welded steel yeeb nkab qib hauv A333 / A333M specification, uas npog cov yeeb nkab rau qis - qhov kub thiab txias. Qib 8 belongs rau 9% nickel steel tsev neeg: nws muaj 8.40% mus rau 9.60% npib tsib xee, uas muab cov hlau tshwj xeeb toughness ntawm qhov kub thiab txias. Nws yog qhov tsim nyog los ntawm kev ntsuam xyuas qhov cuam tshuam ntawm -195 degree, uas ua rau nws yog ib qho ntawm ob peb cov ntaub ntawv ferritic haum rau cov kua dej ntuj thiab lwm yam xov xwm cryogenic. Cov khoom siv tau muab tso rau hauv quenched thiab tempered, los yog ob chav normalized thiab tempered, mob, thiab nws yog siv qhov twg cov pa roj carbon zoo tib yam thiab txawm 3.5% npib tsib xee steel tsis tuaj yeem muab kev nyab xeeb txaus.
Vim li cas Nickel ntawm 9 feem pua
Nickel yog lub hauv paus tseem ceeb rau kev txhim kho qhov qis -kub toughness ntawm hlau. Raws li cov ntsiab lus npib tsib xee nce, cov khoom siv hluav taws xob - mus rau - qhov kub thiab txias hloov pauv poob. Txog li 9% npib tsib xee, ferritic hlau tuaj yeem siv kev ntseeg siab mus rau -195 degree, qhov kub ntawm cov kua nitrogen thiab qhov ntsuas kub rau LNG kev pabcuam. Qib 9% npib tsib xee sib xyaw ua ke qhov kev sib tw no nrog lub zog siab, uas yog vim li cas nws tau ua cov khoom siv rau LNG loj cia tso tsheb hlau luam thiab cov kav dej cryogenic tau ntau xyoo.
Tshuaj muaj pes tsawg leeg
| Element | Limit (qhov hnyav%) |
|---|---|
| Cov pa roj carbon (C) | Tsawg dua lossis sib npaug li 0.13 |
| Silicon (Si) | 0.13–0.32 |
| Manganese (Mn) | Tsawg dua los yog sib npaug li 0.90 |
| Phosphorus (P) | Tsawg dua lossis sib npaug li 0.025 |
| Sulfur (S) | Tsawg dua lossis sib npaug li 0.025 |
| Nickel (Ni) | 8.40–9.60 |
Mechanical Properties
| Khoom | Kev xav tau |
|---|---|
| Tensile zog | Ntau dua lossis sib npaug li 690 MPa |
| Yield zog | Ntau dua lossis sib npaug li 515 MPa |
| Elongation | Ntau dua lossis sib npaug li 22% |
| Impact test kub | -195 degree |
| Kev cuam tshuam kev lees txais | Lateral expansion Ntau dua los yog sib npaug li 0.38 hli, tsis yog absorbed zog |
Ob lub ntsiab lus tsim nyog saib xyuas. Ua ntej, lub zog muaj zog ntau dua li cov qib qis zoo tib yam -kub carbon steels, uas tso cai rau cov phab ntsa nyias thiab cov qauv sib dua. Qhov thib ob, qhov cuam tshuam kev lees paub ntawm -195℃yog qhov nthuav dav ntawm cov qauv Charpy, tsis yog lub zog nqus cov nqi siv rau feem ntau lwm qib; cov txheej txheem tswj hwm thiab qhov project specification yuav tsum tau siv raws nraim.
Kev kho cua sov thiab kev tsim khoom
Qib 8 yeeb nkab yuav tsum tau tsim los ntawm cov txheej txheem seamless los yog welded nrog cov txheej txheem tswj, thiab cov yeeb nkab tiav yog cua sov kho los ntawm quenching thiab tempering los yog ob chav normalizing thiab tempering. Kev kho cua sov tsim kom zoo, tsis tu ncua microstructure, feem ntau yog sib xyaw ntawm tempered martensite thiab khaws cia austenite, uas yog lub luag haujlwm rau kev sib xyaw ua ke ntawm lub zog siab thiab cryogenic toughness. Qhov ntev ntev, qhov zoo ntawm qhov chaw thiab tsis yog -kev tshuaj xyuas kev puas tsuaj ua raws li qhov yuav tsum tau ua ntawm A333 / A333M thiab kev yuav khoom tshwj xeeb.
Daim ntawv thov
Qib 8 yeeb nkab yog siv rau LNG liquefaction thiab regasification nroj tsuag, cryogenic cia tank piping, kua nitrogen thiab kua ethylene systems, huab cua sib cais units thiab lwm yam chaw uas tus tsim hlau kub ncav cuag -195℃los yog qis dua. Nws kuj yog siv rau shipboard LNG tuav systems. Rau qhov kub thiab txias mus txog -45 degree, qis-alloy qib xws li A333 Qib 6 yog kev lag luam ntau dua, yog li kev xaiv qib yuav tsum ib txwm pib los ntawm qhov ntsuas qhov ntsuas qhov tsawg kawg nkaus.
Welding thiab Fabrication Points
9% npib tsib xee steel yuav tsum tau tsim nyog cov txheej txheem vuam nrog sib txuam lossis overmatching muab tub lim hlau, feem ntau yog npib tsib xee- puag los yog austenitic stainless consumables, thiab ceev faj tswj cov cua sov input thiab interpass kub. Tom qab-weld kev kho cua sov feem ntau yog zam los yog tswj nruj heev vim tias nws tuaj yeem txo cov austenite khaws cia uas ua rau tawv tawv. Kev ntsuam xyuas kev cuam tshuam ntawm cov welded sib koom ua ke ntawm qhov tsim kub yog feem ntau yuav tsum tau.
FAQ
Q1: Vim li cas qhov cuam tshuam rau Qib 8 lateral expansion es tsis txhob muaj zog?
Ntawm -195℃lub zog nqus ntawm 9% npib tsib xee hlau tuaj yeem siab tab sis tawg, thaum lub sijhawm nthuav dav ntawm Charpy specimen yog qhov kev ntsuas ntau dua ntawm cov khoom muaj peev xwm deform ua ntej tawg. Lub A333 specification yog li ntawd siv qhov tsawg kawg nkaus lateral expansion ntawm 0.38 hli.
Q2: Qhov kub ntawm A333 Qib 8 yog dab tsi?
Qib yog tsim nyog los ntawm kev ntsuam xyuas qhov cuam tshuam ntawm -195 degree, yog li nws tsim nyog rau kev tsim qhov kub thiab txias mus rau qhov nqi, npog LNG, kua nitrogen thiab cov kev pabcuam cryogenic zoo sib xws.
Q3: Puas yog Qib 8 yeeb nkab seamless?
No. A333 npog ob leeg seamless thiab welded yeeb nkab, tab sis rau cov kev pab cuam cryogenic cov welded yeeb nkab yuav tsum tau tsim nrog cov txheej txheem vuam tsim nyog thiab cov vuam yuav tsum ua tau raws li qhov yuav tsum tau ua raws li cov hlau puag.
Q4: Dab tsi muab cov hlau siv los txuas 9% nickel steel?
Nickel-puag alloy lossis austenitic stainless hlau consumables feem ntau yog siv vim lawv khaws toughness ntawm cryogenic kub thiab zam lub nkig lug uas muaj peev xwm tsim nrog ferritic fillers.
Q5: A333 Qib 6 puas tuaj yeem hloov qib 8?
Tsis yog. Qib 6 yog qhov cuam tshuam- kuaj ntawm -45℃thiab tsuas yog txwv rau qhov ntsuas kub ntawm qib ntawd. Ntawm -195℃tsuas yog Qib 8 lossis austenitic stainless hlau yog qhov tsim nyog.
Q6: Qhov zoo ntawm Qib 8 yeeb nkab tau txheeb xyuas li cas?
Los ntawm kev tshuaj xyuas tshuaj, kev sim tensile, Charpy cuam tshuam kev sim ntawm -}195 degree, hardness checks qhov twg muaj feem xyuam, hydrostatic los yog non-destructive testing, seem soj ntsuam thiab xyuas ntawm lub tshav kub kev kho mob voj voog, tag nrho cov qhia nyob rau hauv daim ntawv pov thawj zeb xeem.