LubASTM A335 tus qauvmuaj ntau qib ntawm cov kav dej ferritic alloy steel seamless; vim muaj qhov sib txawv ntawm cov tshuaj lom neeg thiab cov khoom siv kho tshuab, txhua qib yog haum rau qhov kub thiab txias, siab, thiab ib puag ncig corrosive.

1. A335 P5(Sib npaug rau cov qib hauv tsev12Cr5Mo/1Cr5Mo)

P5 yog ib qho ntawm cov qib sawv cev tshaj plaws hauv ASTM A335 tus qauv, muaj cov ntsiab lus chromium ntawm 4.00–6.00% thiab cov ntsiab lus molybdenum ntawm 0.45–0.65%. Cov khoom siv no ua raws li ASTM A335/A335M thiab ASME SA335/SA335M cov qauv, muab lub zog tensile ntawm ≥415 MPa thiab lub zog yield ntawm ≥205 MPa.

Cov kav hlau P5 ua rau muaj kev tiv thaiv cua sov thiab nkag mus rau hauv qhov chaw kub siab txog li 540 ° C. Cov ntawv thov tseem ceeb suav nrog:

Kev Lag Luam Fais Fab: Boiler superheaters, reheaters, thiab cov kav dej loj; tsim rau cov khoom siv boiler siab ua haujlwm ntawm qhov siab ≥9.8 MPa thiab qhov kub ntawm 450 ° C thiab 650 ° C.

Kev Lag Luam Petrochemical: Cov khoom tseem ceeb xws li cov kav dej hloov pauv rau cov reactors hydroprocessing, cov kab hloov pauv rau cov chav tawg, thiab cov chav hloov pauv catalytic. Hauv cov roj thiab roj uas muaj sulfur, qhov xeb ntawm P5 hlau yog 40% qis dua li ntawm 304 stainless hlau. Kev tsim cov khoom siv: Cov khoom siv kho tshuab xws li cov kav dej roj, cov tsav tsheb, thiab cov nplhaib dov.

2. A335 P9

P9 yog cov khoom siv high-chromium series, nrog rau cov chromium ntsiab lus ntawm 8-10% thiab molybdenum ntsiab lus ntawm 0.9-1.1%; nws muaj kev tiv thaiv oxidation kub zoo heev thiab muaj zog siab. Cov kav dej no feem ntau yog siv hauv kev lag luam petrochemical thiab cov khoom siv boiler, tsim nyog rau qhov chaw ua haujlwm siab, kub siab (qhov siab ua haujlwm siab tshaj plaws > 9.8 MPa; kub txog 650 ° C). P9 feem ntau yog siv los tsim cov khoom siv siab xws li boiler superheaters thiab reheaters, thiab pom cov ntawv thov dav hauv cov chaw ua haujlwm catalytic cracking thiab cov kav dej kub sulfur.

3. A335 P11

P11 yog cov hlau chromium-molybdenum uas tsis muaj hlau ntau nrog cov ntsiab lus chromium ntawm 1.0–1.5% thiab cov ntsiab lus molybdenum ntawm 0.44–0.65%, muab kev vuam zoo thiab lub zog kub nruab nrab. Nws cov kev ua tau zoo dua li cov kav hlau seamless ib txwm muaj; nws sib dua hauv qhov hnyav thaum muab kev khoov thiab lub zog torsional sib npaug.

P11 feem ntau yog siv rau hauv:

Cov khoom sib pauv cua sov thiab cov kav dej xa mus rau qhov kub nruab nrab hauv kev lag luam petrochemical

Cov kav dej kub siab hauv kev lag luam xws li kev rho roj, kev xa roj av, thiab kev tsim hluav taws xob thermal

Kub siv tau: ≤550 ° C

P11 yog cov khoom siv hloov kho dua tshiab zoo dua thaum qhov kub ua haujlwm tshaj qhov txwv siab tshaj plaws rau cov kav hlau carbon (ASTM A106).

4. A335 P22(sib npaug rau qib hauv tsev12Cr2MoG)

P22 muaj 2.25% chromium thiab 1% molybdenum thiab tsim tshwj xeeb rau qhov kub thiab txias, qhov chaw siab, nrog rau qhov kub ua haujlwm txog li 580 ° C thiab siab ≥9.8 MPa. Cov khoom siv ua ke lub zog nkag-tawm siab nrog kev ua haujlwm zoo mus sij hawm ntev.

P22 siv dav rau cov kav dej loj thiab cov taub hau hauv cov chaw tsim hluav taws xob boilers, superheaters thiab cov kav dej hauv kev lag luam petrochemical, thiab cov kav dej siab hauv cov khoom siv hluav taws xob nuclear. Qhov kub thiab txias siv tau: ≤600 ° C. Nws ua lub luag haujlwm tseem ceeb hauv ntau yam kev siv kav dej kub thoob plaws lub zog thermal, lub zog nuclear, thiab cov khoom siv petrochemical. 5. A335 P91 (sib npaug rau qib hauv tsev 10Cr9Mo1VNb)

P91 yog qib ua tau zoo hauv A335 series, muaj cov ntsiab lus chromium ntawm 8–9.5% thiab cov ntsiab lus molybdenum ntawm 0.85–1.05%, nrog rau kev ntxiv cov ntsiab lus micro-alloying xws li vanadium (V) thiab niobium (Nb). Nws muab lub zog tso tawm ntawm ≥415 MPa thiab lub zog tensile ntawm ≥585 MPa, thiab tsim nyog rau kev ua haujlwm kub txog li 625 ° C.

Cov txiaj ntsig tseem ceeb ntawm P91 suav nrog:

Nws qhov kev ntxhov siab uas tso cai rau hauv 550–650 ° C yog ob npaug ntawm cov hlau ib txwm muaj, uas tso cai rau kev txo qis 40% ntawm cov yeeb nkab phab ntsa tuab hauv cov xwm txheej zoo sib xws.

Nws muaj zog heev thaum tshav kub kub, tiv taus oxidation, thiab tiv taus creep.

Nws lub zog tawg ntawm 600 ° C yog 3-4 npaug siab dua li ntawm cov ntaub ntawv sib piv.

P91 feem ntau yog siv rau cov kav dej loj hauv cov chaw tsim hluav taws xob supercritical thiab ultra-supercritical, cov kav dej siab hauv cov chaw tsim hluav taws xob nuclear, thiab cov superheaters hauv cov chaw tsim hluav taws xob loj. Nyob rau xyoo tas los no, nws tau siv dav rau cov kav dej loj hauv cov chaw tsim hluav taws xob loj hauv kuv lub tebchaws.