ASTM A335 P5 Yeeb Nkab yog dab tsi
ASTM A335 P5 yog seamless ferritic alloy steel yeeb nkab qib nrog nominal chemistry ntawm 5% chromium thiab 0.5% molybdenum, kev sib xyaw ua ke feem ntau sau ua 5Cr-0.5Mo. Nws yog tsim nyob rau hauv A335 specification rau seamless yeeb nkab rau siab - kub kev pab cuam thiab muab nyob rau hauv kub-tiav mob uas tsis muaj longitudinal seam.
Kev nce qib hauv cov ntsiab lus chromium los ntawm qib 1-1/4Cr thiab 2-1/4Cr yog qhov txhais lub luag haujlwm ntawm cov khoom no. Chromium tswj kev tiv thaiv oxidation thiab scaling, rau cov txheej txheem sulphur-cov kabmob kwj thiab mus rau high-temperature hydrogen nres, thaum molybdenum muab cov creep zog uas tso cai rau cov yeeb nkab nqa lub siab ntawm kub siab tshaj lub neej ntev tsim.
Chemical Composition thiab Mechanical Requirements
| Yam khoom | Kev xav tau |
|---|---|
| Cov pa roj carbon, max | 0.15% |
| Manganese | 0.30-0.60% |
| Phosphorus, max | 0.025% |
| Sulphur, max | 0.025% |
| Silicon, max | 0.50% |
| Chromium | 4.00-6.00% |
| Molybdenum | 0.45-0.65% |
| Tensile zog, min | 415 MPa rau |
| Yield zog, min | 205 MPa |
| Yam khoom | Seamless, kub tiav |
| Kev sim | Tensile, khoov, flattening thiab hydrostatic xeem siv rau qib no |
Cov pa roj carbon ntsiab lus tau tuav qis hauv qib no vim tias cov pa roj carbon ntau dua ua ke nrog 5% chromium ua rau cov vuam cua sov- cuam tshuam thaj tsam nyuaj thiab tawg ntau dua tom qab txias. Kev tsim qauv tso cai raug coj los ntawm cov cuab yeej siv siab tswj hwm qhov project es tsis yog los ntawm qhov tsawg kawg nkaus qhov kev lees paub hauv cov lus saum toj no, vim tias qhov txiaj ntsig kev ntxhov siab tso cai nyob ntawm qhov kub thiab txias ntawm cov hlau thiab ntev - lub sij hawm nkag thiab tawg cov ntaub ntawv.
Qhov twg siv 5Cr-0.5Mo Pipe
Hluav taws xob cua sov raj thiab rov khoov rau hauv refinery crude thiab lub tshuab nqus tsev, qhov twg tube hlau kub yog siab thiab cov txheej txheem kwj yuav ua tau sulphurous.
Cov txheej txheem piping hauv catalytic cracking, coking thiab hydroprocessing units, nrog rau cov kab hloov mus thiab cov khoom kub.
Hydrogen-cov kev pabcuam kabmob, qhov twg cov ntsiab lus chromium thiab molybdenum muab kev tiv thaiv rau siab -kub hydrogen nres uas carbon thiab qis- alloy steels tsis tuaj yeem xa.
Boiler thiab superheater seem, thiab cov kav dej ua haujlwm siab tshaj qhov ntsuas kub ntawm qib 2-1 / 4Cr.
Thaum tshav kub kub exchanger thiab cov hlab ntsha siab nyob rau hauv siab -kub refinery thiab petrochemical lub luag hauj lwm.
Vim tias qib feem ntau xaiv rau corrosion thiab hydrogen tsis kam es tsis yog lub zog creep ib leeg, cov neeg tsim khoom xaiv cov khoom siv nrog cov txheej txheem: hydrogen ib nrab siab, cov ntsiab lus sulfur thiab hlau kub ua ke txiav txim siab seb 5Cr-0.5Mo puas txaus lossis seb yuav tsum muaj 9% chromium qib.
Fabrication, Vuam thiab Kev kho cua sov
Vuam siv cov txheej txheem tsim nyog thiab sib piv 5Cr-0.5Mo consumable classified rau qhov tsim nyog AWS muab tub lim hlau specification, los yog lwm consumable pom zoo los ntawm tus tsim code.
Preheat yog yuav tsum tau, thiab qhov tsawg kawg nkaus interpass kub yog khaws cia thoob plaws hauv kev sib koom ua ke kom tsis txhob nyuaj, nkig cua sov- cuam tshuam cheeb tsam cov qauv.
Tom qab-weld kev kho cua sov yog qhov yuav tsum tau ua rau qib no rau feem ntau ntawm cov phab ntsa thicknesses, thiab qhov sov so, tuav lub sij hawm thiab tswj cov cua sov thiab cua txias raws li txoj cai tsim.
Qhov hnyav - cov yeeb nkab phab ntsa yog kub tsim los yog khoov, tag nrho cov normalizing thiab tempering kev kho mob yog siv tom qab ntawd kom cov creep zog ntawm cov seem tsim phim cov yeeb nkab ncaj.
Kev sib tsoo, machining thiab thermal txiav cov txheej txheem yuav tsum tsis txhob tawm ntawm txheej tawv tawv lossis oxidised ntawm ib qho chaw uas yuav tom qab welded.
Ordering thiab Inspection Points
Qhia qhov tshwj xeeb thiab qib, tus me nyuam qhov xwm txheej, qhov ntev thiab phab ntsa thickness, thiab qhov yuav tsum tau kuaj thiab ntawv pov thawj pob ntawm kev yuav khoom.
Nyeem cov kev ntsuas kub ntawm daim ntawv pov thawj zeb tawm tsam cov kev qhia tshwj xeeb, them nyiaj tshwj xeeb rau carbon, chromium thiab molybdenum.
Tshawb xyuas cov ntaub ntawv ntsuas hydrostatic, thiab paub meej tias tsis yog -kev tshuaj ntsuam xyuas txoj kev siv rau lub cev yeeb nkab.
Ntsuas phab ntsa tuab thiab ovality, txij li qhov ntsuas siab ntawm cov kab tiav nyob ntawm phab ntsa tiag tiag tsis yog phab ntsa nominal.
Khaws cov yeeb nkab sib cais los ntawm cov khoom siv carbon steel thiab tsis muaj kev sib cuag hauv av, thiab tiv thaiv kev txiav kom txog thaum sib koom ua ke.
FAQ
Q: ASTM A335 P5 yeeb nkab yog dab tsi?
Nws yog seamless ferritic alloy steel yeeb nkab qib nrog txog 5% chromium thiab 0.5% molybdenum, muab raws li A335 specification rau siab - kub kev pab cuam.
Q: Vim li cas 5Cr-0.5Mo thiaj xaiv 2-1/4Cr-1Mo?
Cov ntsiab lus chromium ntau dua ua rau muaj kev tiv thaiv zoo dua rau oxidation, sulfur nres thiab siab -kub hydrogen nres, uas tseem ceeb hauv cov txheej txheem refinery thiab petrochemical kwj.
Q: Puas yog P5 yeeb nkab welded lossis seamless?
Cov qib tau teev tseg raws li seamless kub- cov yeeb nkab tiav hauv A335 specification, yog li tsis muaj qhov ntev ntawm qhov sib txuas hauv cov yeeb nkab lub cev.
Q: Puas yog P5 yeeb nkab xav tau kev tshaj tawm -weld cua sov kho?
Yog lawm. Tom qab-weld heat treatment yog xav tau rau qib no rau feem ntau thicknesses thiaj li temper lub tshav kub- cuam tshuam cheeb tsam thiab txo cov seem seem.
Q: Dab tsi yog qhov nyuaj fabrication?
Qhov nyuaj, tawg rhiab cua sov- thaj tsam cuam tshuam uas tsim tom qab vuam, uas yog tswj los ntawm preheat, interpass kub tswj, qis -hydrogen xyaum thiab sai tom qab-weld tshav kub kho.
Q: Dab tsi yuav tsum tau kuaj xyuas ua ntej fabrication?
Cov lej thiab cov cua sov, ntsuas cua sov, cov txiaj ntsig tensile, qhov ntev thiab phab ntsa tuab, ntxiv rau hydrostatic thiab tsis yog{0}} cov ntaub ntawv ntsuas kev puas tsuaj.
