Dab tsi Ua Cov Yeeb Nkab Ua Yeeb Yam Hlau Hlau
Alloy steel yeeb nkab yog cais los ntawm cov khoom uas nws yog tsim es tsis yog los ntawm txoj kev nws yog tsim. Ntxiv cov ntsiab lus ntawm cov khoom xws li chromium, molybdenum, npib tsib xee los yog vanadium rau cov pa roj carbon steel ua cov khoom uas nws lub zog, creep resistance, toughness los yog corrosion kuj yog heev txawv ntawm cov pa carbon steel, thiab cov yeeb nkab ua los ntawm nws siv lub npe ntawm cov khoom niam txiv.
Qhov txawv ntawm cov yeeb nkab seamless yog li ntawd orthogonal. Cov yeeb nkab seamless piav qhia txog txoj kev tsim, tsis muaj qhov sib txuas ntev, thiab cov yeeb nkab alloy piav qhia txog chemistry. Alloy steel yeeb nkab yog feem ntau muab seamless, thiab kuj raws li ncaj seam welded thiab kauv welded yeeb nkab qhov twg txoj kab uas hla thiab phab ntsa thickness ua rau txoj kev uas pheej yig dua. Ob qhov kev faib tawm teb cov lus nug sib txawv thiab yuav tsum tsis txhob tsis meej pem thaum sau ntawv xaj khoom.
Vim li cas Alloying Elements Ntxiv
| Element | Cov nyhuv ntawm cov hlau | Qhov laj thawj rau nws ntxiv |
|---|---|---|
| Chromium | Nce hardenability, oxidation tsis kam thiab siab kub zog | Fais fab nroj tsuag thiab refinery piping ntawm siab kub |
| Molybdenum | Nce creep zog thiab tiv thaiv hydrogen nres | Chrome molybdenum qib hauv chav thiab hydrogen kev pabcuam |
| Nickel | Txhim kho qhov kub thiab txias toughness thiab hardenability | Cryogenic thiab qis kub piping |
| Vanadium thiab niobium | Grain refinement thiab nag lossis daus muaj zog | Niaj hnub nimno siab zog creep resistant qib |
| Manganese thiab silicon | Deoxidation thiab kev daws teeb meem ntxiv dag zog | Txhua alloy yeeb nkab qib, nyob rau hauv tus qauv txwv |
Cov Tsev Neeg Tseem Ceeb Alloy Pipe thiab Lawv Cov Qauv
Chrome molybdenum yeeb nkab rau ASTM A335 npog cov qib ferritic alloy siv rau kev pabcuam kub, suav nrog qib 1.25 feem pua chromium, qib 2.25 feem pua chromium thiab 9 feem pua chromium martensitic qib. Cov tsev neeg sib npaug European tau teev tseg hauv EN 10216-2.
Cov yeeb nkab uas tsis tshua muaj kub rau ASTM A333 yog alloyed los tuav cov kev cuam tshuam toughness ntawm qhov kev pabcuam kub, thiab yog siv dav hauv cov roj liquefied thiab cov kav dej txias.
Boiler, superheater thiab kub exchanger raj rau ASTM A213 npog tib lub dav hlau tsev neeg nyob rau hauv me me txoj kab uas hla raj daim ntawv.
Suav teb lub teb chaws tus qauv yeeb nkab rau GB / T 5310 thiab GB 6479 npog lub siab siab boiler raj thiab siab siab tshuaj chiv yeeb nkab, thiab yog dav teev rau domestic thiab export tej yaam num.
Corrosion resistant alloy thiab duplex yeeb nkab rau chloride los yog acidic kev pab cuam, xaiv thaum lub alloy cov ntsiab lus yuav tsum tau txav mus rau lub scope ntawm cov qib qis alloy.
Standard Qib ntawm ib nrais muag
Cov txiaj ntsig hauv qab no yog cov cuab yeej cuab tam yam tsawg kawg nkaus tau teev tseg rau cov yeeb nkab lub cev los ntawm ASTM cov khoom specification. Lawv yog qhov tsawg kawg nkaus txais txiaj ntsig rau tus qauv, tsis yog qhov ntsuas tau zoo.
| Qib | Nominal muaj pes tsawg leeg | Min tensile zog (MPa) | Min yield zog (MPa) | Cov kev pabcuam |
|---|---|---|---|---|
| A335 P11 | 1.25% chromium, 0.5% molybdenum | 415 | 205 | Chav thiab txheej txheem piping ntawm nruab nrab kub |
| A335 P22 | 2.25% chromium, 1% molybdenum | 415 | 205 | Kub kub chav thiab kev pabcuam hydrogen |
| A335 P91 | 9% chromium, 1% molybdenum, vanadium thiab niobium | 585 | 415 | Main chav thiab reheat kab nyob rau hauv niaj hnub fais fab nroj tsuag |
| A333 Qib 6 | Nickel alloyed carbon hlau | 415 | 240 | Tsawg kub thiab kev pabcuam cryogenic |
Qhov twg Alloy yeeb nkab siv
Kev kub siab alloy yeeb nkab yog cov khoom siv tseem ceeb hauv kev tsim hluav taws xob, qhov twg superheater thiab reheater tubing thiab cov kav dej tseem ceeb ua haujlwm siab tshaj qhov kub ntawm qhov uas cov hlau yuav nkag mus. Nyob rau hauv refineries thiab petrochemical nroj tsuag nws nqa hydrogen nplua nuj thiab kub txheej txheem kwj, thiab nyob rau hauv chemical fertilizer nroj tsuag nws lis synthesis gas thiab ammonia circuits. Cov qib kub qis pab cov roj liquefied natural gas, huab cua sib cais thiab cov kav dej txias. Nyob rau hauv txhua yam ntawm cov dej num no tus neeg tsav tsheb xaiv yog kev sib xyaw ntawm qhov kub thiab txias, siab thiab chemistry ntawm qhov nruab nrab, tsis yog tus nqi ib tonne ib leeg.
Kev xaiv, kev kho cua sov thiab kev taw qhia vuam
Qhia cov qib, cov khoom specification thiab cov kev kho cua sov ua ke. Chrome molybdenum yeeb nkab yog ib txwm muab rau normalized thiab tempered los yog, rau cov qib siab chromium, nyob rau hauv ib tug tag nrho tempered martensitic mob, thiab daim ntawv pov thawj yuav tsum qhia lub sij hawm kho cua sov lub sij hawm vim hais tias tib qib kub kho sib txawv yuav tsis xa tib creep kev ua tau zoo.
Vuam ntawm cov yeeb nkab alloy yog xav tau ntau tshaj qhov vuam carbon hlau. Preheat thiab interpass kub yuav tsum tau tswj, tsawg hydrogen consumables yuav tsum tau, thiab tom qab weld tshav kub kev kho mob feem ntau yuav tsum tau temper lub nyuaj tshav kub cuam tshuam cheeb tsam. Rau 9 feem pua ntawm cov qib chromium lub voj voog thermal yog qhov tseem ceeb thiab ib txwm hais los ntawm cov txheej txheem vuam tsim nyog, nrog rau kev kuaj xyuas qhov ua tiav ntawm kev sib koom ua tiav. Cov neeg yuav khoom yuav tsum xav tau cov txheej txheem vuam, cov ntawv pov thawj siv tau thiab cov ntaub ntawv xa tawm kev kho cua sov ua ib feem ntawm cov ntaub ntawv pob.
Common Pitfalls
Kev kho alloy thiab seamless raws li cov lus sib dhos, uas ua rau cov khoom tsis raug raug txiav txim rau lub luag haujlwm kub kub.
Kev lees txais daim ntawv pov thawj uas hais txog qib tab sis tsis yog qhov kev kho cua sov, uas ua rau cov khoom nkag tsis tau.
Hloov cov qib chromium qis raws li lub zog tensile zoo sib xws, uas tsis quav ntsej qhov txawv ntawm qhov kub thiab txias.
Tsis quav ntsej qhov sib txawv ntawm qhov tsawg kawg nkaus uas tau teev tseg thiab raug raws li tus nqi xa tawm thaum tsim rau qhov txwv.
Ua tsis tiav kev npaj tom qab kev kho cua sov ua ntej fabrication, kom lub cub tawg muaj peev xwm ua ib qho kev txwv.
FAQ
Q: Puas yog alloy steel yeeb nkab ib txwm seamless?
Tsis yog. Ob nqe lus piav qhia teb cov lus nug sib txawv. Alloy hais txog chemistry ntawm cov khoom, thaum seamless hais txog txoj kev sib sau, thiab cov yeeb nkab alloy yog muab ob qho tib si seamless thiab welded nyob ntawm txoj kab uas hla, phab ntsa thickness thiab specification.
Q: Qhov txawv ntawm chrome molybdenum yeeb nkab thiab carbon steel yeeb nkab yog dab tsi?
Chrome molybdenum qib muaj txhob txwm tshaj tawm chromium thiab molybdenum ntxiv uas txhawb nqa lub zog thiab qhov kub thiab txias, yog li lawv tuaj yeem ua haujlwm ntawm qhov kub thiab txias uas cov pa roj carbon steel yuav deform qeeb hauv load.
Q: Vim li cas kev kho cua sov tom qab vuam xav tau ntawm cov yeeb nkab hlau?
Vuam tsim ib qho nyuaj, brittle tshav kub cuam tshuam cheeb tsam. Tempering thaj tsam ntawd los ntawm kev kho cua sov tom qab vuam rov ua kom tawv thiab txo qhov kev ntxhov siab, uas yog qhov tseem ceeb rau kev nyab xeeb ntawm qhov kub thiab txias.
Q: Kuv yuav xaiv li cas ntawm qib qis thiab qib siab chromium?
Kev xaiv yog tsav los ntawm kev tsim qhov kub thiab txias, sab hauv siab, chemistry ntawm qhov nruab nrab thiab lub neej tsim tsim. Cov qib siab chromium raug nqi ntau dua tab sis tso cai rau cov phab ntsa nyias nyias lossis siab dua, yog li qhov kev sib piv yog ua los ntawm tag nrho cov nqi nruab thiab lub neej.
Q: Cov yeeb nkab puas tuaj yeem siv tau?
Yog lawm. Cov yeeb nkab steel yog cov khoom siv rov ua dua tshiab, thiab cov ntsiab lus alloy tau rov qab los ua cov nqi seem, uas txhawb nqa cov peev txheej kev sib cav rau kev siv siab siab alloy yeeb nkab hauv kev teeb tsa lub neej ntev.
Q: Cov ntaub ntawv dab tsi yuav tsum nrog rau cov yeeb nkab xa khoom?
Daim ntawv pov thawj zeb xeem uas qhia cov naj npawb cua sov, tshuaj ntsuam xyuas, tensile thiab cov txiaj ntsig tau, cov kev kho cua sov thiab cov qauv siv tau, ua ke nrog cov ntaub ntawv ntsuas ntxiv xws li kev ntsuam xyuas qhov cuam tshuam lossis kev soj ntsuam hardness xav tau los ntawm kev txiav txim.
