Txheej txheem cej luam
Txheem: ASTM A335 / A335M- Txheem Specification rau Seamless Ferritic Alloy-Steel Pipe rau High-Tsev Kev Pabcuam.
Qib: P91(Ceeb Toom: Qhov kev xaiv feem ntau yog P91, tsis yog P911. "P911" tej zaum yuav yog typo lossis ib qho txawv txawv heev. Cov ntaub ntawv hauv qab no yog rau tus qauv thiab siv dav.A335 P91). Yog tias koj xav tau qib "P911" tshwj xeeb, nws yuav yog tus tswv lossis tus qauv sib txawv, thiab koj yuav tsum paub meej qhov tseeb nrog koj tus neeg muag khoom.
Hom Lub Npe:Chrome-Moly yeeb nkab (vim nws cov ntsiab lus Chromium thiab Molybdenum). P91 yog qib siab ntawm qib P9 thiab P22 qub.
Feature tseem ceeb:Zoo heevcreep zogthiab oxidation tsis kam ntawm siab kub.
Tshuaj muaj pes tsawg leeg (rau Standard A335 P91)
Cov muaj pes tsawg leeg yog qhov tseem ceeb rau kev ua tiav qhov xav tau siab -kub khoom.
| Element | Kev sib xyaw (%) |
|---|---|
| Cov pa roj carbon (C) | 0.08 - 0.12 |
| Manganese (Mn) | 0.30 - 0.60 |
| Phosphorus (P) | 0.025 max |
| Sulfur (S) | 0.025 max |
| Silicon (Si) | 0.20 - 0.50 |
| Chromium (Cr) | 8.00 - 9.50 |
| Molybdenum (hli) | 0.85 - 1.05 |
| Vanadium (V) | 0.18 - 0.25 |
| Niobium (Nb) | 0.06 - 0.10 |
| Nickel (Ni) | 0.40 max |
| Aluminium (Al) | 0.04 max |
| Nitrogen (N) | 0.03 - 0.07 |
Vim li cas qhov kev sib xyaw no tseem ceeb:
Chromium (Cr):Muab oxidation thiab corrosion kuj ntawm qhov kub thiab txias.
Molybdenum (Molybdenum):Nce zog thiab creep kuj.
Vanadium (V) & Niobium (Nb):Tsim cov carbides ruaj khov thiab nitrides uas muab cov nag lossis daus tseem ceeb, uas yog qhov tseem ceeb rau P91 lub zog creep zoo dua.
Mechanical Properties
P91 yeeb nkab yog ib txwm muab rau hauvNormalized & Temperedkub- kho mob.
| Khoom | Tus nqi |
|---|---|
| Tensile zog | 585 MPa (85,000 psi) min |
| Yield zog | 415 MPa (60,000 psi) min |
| Elongation | 20% min |
Cov yam ntxwv tseem ceeb & qhov zoo
Siab -Tsub Muaj Zog:Nws lub ntsiab kom zoo dua yog exceptionalcreep rupture zogntawm qhov kub thiab txias feem ntau yog li ntawm 565℃mus rau 625℃(1050℃F txog 1160℃F). Qhov no tso cai rau kev tsim cov txheej txheem thinner -walled, sib dua- cov kav dej hnyav uas tuaj yeem tiv taus tib lub siab raws li cov kav dej tuab ua los ntawm cov khoom qis dua - qib.
Zoo Oxidation Resistance:Cov ntsiab lus siab chromium tiv thaiv cov hlau los ntawm kev ntsuas thiab oxidation hauv chav ib puag ncig.
Thermal Fatigue Resistance:Ua tau zoo nyob rau hauv cyclic cua sov thiab txias tej yam kev mob.
Tus nqi -Kev ua tau zoo:Txawm hais tias kim dua li cov pa roj carbon steel (xws li A106 B), nws yog kev lag luam ntau dua li siab dua - alloy steels xws li P92 lossis stainless hlau rau nws qhov kub thiab txias, muab qhov sib npaug zoo ntawm kev ua tau zoo thiab tus nqi.
Cov ntawv thov siv
A335 P91 yeeb nkab tsuas yog siv rau hauv siab - qhov kub thiab txias, siab - lub zog tsim hluav taws xob thiab cov chaw tsim khoom:
Main Steam Linesnyob rau hauv supercritical thiab ultra-supercritical fais fab nroj tsuag.
Kub Reheat Kabnyob rau hauv lub hwj chim cog boilers.
Siab -Tub kub taub hau kav.
Lwm yam tseem ceeb heev -kub piping systemshauv petrochemical thiab txheej txheem kev lag luam.
Kev txiav txim siab tseem ceeb rau Vuam thiab Fabrication
Ua haujlwm nrog P91 yog qhov nyuaj ntau dua li cov pa roj carbon steel thiab yuav tsum muaj cov txheej txheem nruj:
Preheating:Yuav tsum tau tiv thaiv kev tawg. Hom preheat yog 200℃- 250℃(400℃F - 500℃F).
Tswj cua sov input:Yuav tsum tau ua tib zoo tswj kom tsis txhob brittleness.
Tshaj tawm -Weld Heat Treatment (PWHT): TSEEM CEEB.P91 welds yuav tsum tau txais kev kho cua sov tam sim ntawd tom qab vuam (feem ntau tuav ntawm 760℃/ 1400℃F) mus rau:
Hloov cov qauv martensitic brittle tsim thaum lub sij hawm vuam mus rau hauv ib qho nyuaj, tempered martensite.
Txo cov kev ntxhov siab uas seem.
Ua tiav cov khoom siv kho tshuab uas xav tau hauv thaj chaw weld.
Matching Filler Hlau:Vuam yuav tsum tau ua nrog cov hlau muab tub lim uas phim P91 muaj pes tsawg leeg (xws li, ER90S-B9 rau TIG, E9015-B9 rau stick).
Cov ntsiab lus
ASTM A335 P91yog qhov zoo tshaj plaws seamless alloy steel yeeb nkab tsim rau qhov xav tau tshaj plaws siab - qhov kev pabcuam kub hauv lub zog boilers thiab cov hlab ntsha siab. Nws lub zog zoo dua tso cai rau kev tsim cov nroj tsuag ntau dua tab sis xav tau kev tuav pov hwm, tshwj xeeb tshaj yog thaum vuam thiab kho cua sov.
Lus Cim Tseem Ceeb:Yog tias koj qhov kev xav tau tshwj xeeb hais"P911"thiab tsis yog "P91," thov txheeb xyuas tus qauv thiab cov tshuaj muaj pes tsawg leeg nrog koj tus neeg muab khoom, vim nws yuav xa mus rau qib sib txawv lossis cov tswv cuab.
