Lub ntsiab
ASTM A335 P91 yog qhov tshwj xeeb rauSeamless Ferritic Alloy - Cov Yeeb Nkabnpaj rau high - kev pab kub. Cov qauv "P91" qhia nws cov tshuaj tshwj xeeb muaj pes tsawg leeg, feem ntau sib ntxiv ntawm vanadium thiab niobium.
Cov qib no yog ib feem ntawm tsev neeg ntawm qib siab siab - lub zog hlau tau hu uaCreep Zog Zog Ua Kom Zoo Tshaj Plaws Ferritic (CSEF) Cov HlauCov. Nws tau tsim kom choj cov kev sib txawv ntawm cov hlau qis dua xws li P22 (2.25Cro) thiab kim li cov neeg siv roj (piv txwv li, 304, 316).
Cov yam ntxwv tseem ceeb & Cov txiaj ntsig zoo
Zoo heev - kub lub zog:P91 tus thawj tus ua tau zoo dua yog nws zoo duaCrep Lub Zog-resistance to deformation under long-term exposure to high stress and temperature. Qhov no tso cai rau kev tsim cov raj raj nrog:
Thinner Phab NtsaPiv rau qis - qib alloys alloys, txo cov nqi nqi thiab qhov hnyav.
Siab dua kev ua haujlwm siab thiab kub.
Txhim kho kev ua tau zoo hauv cov nroj tsuag fais fab.
Zoo oxidation & corrosion tsis kam:Cov ntsiab lus chromium (8-9.5%) muab qhov zoo tsis kam mus rau oxidation (scaling) thiab corrosion hauv chav ib puag ncig.
Siab thermal conductivity thiab tsawg thermal expansion:Raws li cov hlau ferritic, P91 muaj cov khoom siv thermal zoo dua li cov hlau tsis muaj zog, ua rau qis dua thermal kev ntxhov siab thaum pib thiab kaw kev voj voog.
Tshuaj lom neeg muaj pes tsawg leeg (%)
Qhov muaj pes tsawg leeg yog qhov tseem ceeb kom ua tiav cov khoom xav tau. Cov hauv qab no yog ib qho ntau ntau ntawm cov astm A335 Txuj Ci:
| Lub ntsiab | Muaj pes tsawg leeg (%) |
|---|---|
| Carbon (c) | 0.08 - 0.12 |
| Manganese (mn) | 0.30 - 0.60 |
| Phosphorus (p) | Max 0.020 |
| Sulphur (s) | Max 0.010 |
| Silicon (si) | 0.20 - 0.50 |
| Chromium (cr) | 8.00 - 9.50 |
| Molybdenum (mo) | 0.85 - 1.05 |
| Vanadium (V) | 0.18 - 0.25 |
| Niobium (nb) | 0.06 - 0.10 |
| Npib tsib caug (ni) | Max 0.40 |
| Nitrogen (n) | 0.03 - 0.07 |
| Aluminium (AL) | Max 0.04 |
| Hlau (FE) | Seem |
Qhov yuam Micrecture:Lub zog ntawm P91 los ntawm kev kho tshav kub kub ua tshav kub kub uas tsim lub zog kub ua kom zoo nkauj microscitates nrog zoo precipitates ntawm vanadium thiab niobium carbides / Nitrides.
Cov Cuab Yeej Siv Neeg Kho Mob (tom qab kev kho cua sov)
Cov kav dej yuav tsum yauv mus rau ib qho kev kho cua sov:Li nontawm 1040-108080℃(1900-1975 Qib F) ua rawsNpau tawsNtawm 730-760℃(1350-1400℃f).
| Ntiag tug | Qhov toob kas |
|---|---|
| Lub zog tensile | Ntau dua los yog sib npaug rau 585 mpa (85 ksi) |
| Paib lub zog | Ntau dua los yog sib npaug rau 415 MPa (60 ksi) |
| Elongation | Ntau dua los yog sib npaug rau 20% |
Cov txheej txheem tsim khoom
As per astm A335 txheem, P91 Pipes yog tsim raws litsis ntseCov. Qhov no txhais tau tias lawv tau tsim los ntawm cov billet fillet tsis muaj lub ntsej muag welded, ua rau lawv muaj zog dua thiab txhim khu kev ntseeg siab rau qhov siab- qhov kev siv siab. Cov kev sib xws suav nrog:
Kub Extrusion
Choarary tho (Mannesmann cov txheej txheem)
Cov Ntawv Thov
ASTM A335 P91 yog feem ntau siv nyob rau hauv lub zog tiam thiab petrochemical kev lag luam uas cov khoom siv muaj teeb meem heev.
Cov Ncauj Hluav Taws Xob thiab Cov Dej KubNyob rau hauv supercritical thiab ultra -} supercritical fais fab nroj tsuag.
High - kev hloov pauv kub thiab ua kom sov boiling.
Kua Nplhaib hauv Petrochemical Nroj TsuagRau siab -} cov txheej txheem kub.
Muaj cov tshuab ua kom sov.
Kev txiav txim siab tseem ceeb rau kev ua kom zoo nkauj thiab siv
P91 tsis yog qhov yooj yim "tso - hauv" hloov rau lwm qib. Nws cov ntaub thaiv yuav tsum tau tswj nruj thiab muaj kev tshaj lij.
Preheating thiab interpass Kub: Tseem ceebCov. Feem ntau yuav tsum tau preheating rau 200-250℃(400-500℃f) ua ntej vuam thiab tswj kev cuam tshuam hnyav tshaj plaws.
Post - Weld Kev Kho Tshav Kub (PWHT): Kiag li tseem ceebCov. PWHT yuav tsum muaj:
Tem siab lub zog, brittic martensite tsim nyob rau hauv weld cua sov -} bein cuam tshuam thaj chaw (Haz).
Ua tiav txoj kev tsim nyog.
Nco ntsoov ntev - lub sij hawm nkag mus.
Raug pwht ntau: 730-760℃(1350-1400℃f).
Kev tswj kom txias tom qab vuam:Cov yeeb nkab yuav tsum tsis pub tso cai kom txias rau chav sov tam sim ntawd tom qab vuam. Nws yuav tsum tau ua nyob rau ntawm preheat kub kom txog thaum pwht yuav ua tau.
Cia:P91 Cheebtsam yuav tsum tau khaws cia rau sab hauv tsev kom tiv thaiv kev nqus dej noo, uas tuaj yeem ua rau pitting corrosion.
Piv sib piv
ASTM A335 P91 yog sib npaug rau ob peb tus qauv thoob ntiaj teb:
ASME:SA335 P91 (Qhov tseem ceeb tib yam tshwj xeeb)
En / din:X10crmovnb9-1 (Cov Khoom Muaj Cai 1.4903)
JIS:Stba 28
Lub ntsiab
ASTM A335 P91 yog qhov siab-}} alloy- kub thiab siab- qhov kev siv siab.Nws lub zog zoo tshaj rau kom muaj txiaj ntsig zoo dua thiab cog cov nroj tsuag tsim qauv. Txawm li cas los xij, nws daim ntawv thov kev vam meej yog hnyav nyob ntawmnruj nreem kom zoo vuam thiab cov txheej txheem kho thaum sovCov. Kev tsis raug cai lossis tsis raug fabrication yuav ua rau kev puas tsuaj loj.
