Dab tsi yog astm a335 p91 tshuaj muaj pes tsawg leeg
Feb 06, 2026
A335 P91yog qib steel hauv American ASTM A335 tus qauv. Nws cov tshuaj lom neeg tseem ceeb yog chromium (8.0%-9.5%), molybdenum (0.85%-1.05%) thiab niobium (0.06%-0.1%). Nws muaj oxidation zoo heev thiab kub-kub chav corrosion kuj thiab belongs rau cov hloov kho 9Cr-1Mo martensitic tshav kub-resistant steel.
GNEE Group yog cov chaw tsim khoom hauv cov yeeb nkab steel hauv Suav teb, muab cov yeeb nkab kev sib tham thiab kev ua haujlwm.Tag nrho QC cov ntaub ntawv muab: spectral tsom xam + mechanical cuab yeej qhia -txhua batch traceable rau cub tawg tooj
P91 Cov Khoom Siv Tshuaj muaj pes tsawg leeg
| C | Si | Mn | P | S | AL | Cr | Cu | Mo | N | Nb | Ni | V | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1.4903 | Min% | 0.08 | 0.30 | 8.0 | 0.85 | 0,030 | 0,060 | 0.18 | ||||||
| Max % | 0.12 | 0.50 | 0.60 | 0,020 | 0.005 | 0,040 | 9.50 | 0.30 | 1.05 | 0,070 | 0,100 | 0.30 | 0.25 | |
- Cov pa roj carbon (C): 0.08% ~ 0.12% Raws li cov khoom siv dag zog, cov ntsiab lus carbon ncaj qha cuam tshuam rau lub zog thiab hardness ntawm cov khoom. Cov ntsiab lus carbon ntau dhau ua rau txo qis weldability; Yog li ntawd, P91 sib npaug lub zog thiab weldability los ntawm kev tswj lub siab txwv ntawm cov ntsiab lus carbon.
- Chromium (Cr): 8.0% ~ 9.5% Chromium yog lub hauv paus tseem ceeb hauv kev tsim cov oxide zaj duab xis ntom ntom, muab cov hlau zoo oxidation thiab corrosion kuj. Nyob rau hauv siab - qhov kub thiab txias ib puag ncig, chromium reacts nrog oxygen los tsim ib tug ruaj khov Cr₂O₃ txheej tiv thaiv, tiv thaiv oxidation ntxiv.
- Molybdenum (Mo): 0.85% ~ 1.05% Molybdenum txhim kho siab - kub lub zog los ntawm cov khoom siv ntxiv dag zog thaum kho cov qauv nplej. Cov carbides nws tsim nrog carbon zoo inhibit siab -kub creep, tso cai rau P91 tswj kev ua tau zoo tshaj 593℃.
- Vanadium (V): 0.18% ~ 0.25% Vanadium cov ntaub ntawv ruaj khov carbonitrides (xws li V (C, N)) nrog cov pa roj carbon thiab nitrogen, txhim kho cov khoom tiv thaiv rau tempering softening thiab creep resistance. Nws cov precipitates zoo tuaj yeem cuam tshuam kev txav mus los thiab txhim kho siab - qhov kub thiab txias.
- Niobium (Nb): 0.06% ~ 0.10% Raws li lub zog carbide- tsim cov khoom, qhov sib ntxiv ntawm niobium tuaj yeem ua kom cov nplej austenite zoo dua qub, txhim kho qhov cuam tshuam toughness thiab vuam kev ua haujlwm ntawm cov khoom siv. Nws cov nyhuv synergistic nrog vanadium ntxiv optimizes siab -kub creep zog.
- Nitrogen (N): 0.03% ~ 0.07% Nitrogen forms nanoscale precipitates nrog vanadium thiab niobium, ua kom cov nag lossis daus muaj zog. Txawm li cas los xij, nitrogen ntau dhau tuaj yeem ua rau txo qis, yog li yuav tsum muaj kev tswj xyuas meej.
Cov Ntsiab Lus Qhia thiab Kev Tswj Xyuas Kev Tsis Txaus Siab
P91 steel muaj kev txwv nruj heev ntawm cov khoom seem:
- Silicon (Si): Tsawg dua los yog sib npaug li 0.50% Ntau silicon txhawb nqa δ-ferrite tsim thiab txo siab - kub toughness. Txawm li cas los xij, qhov tsim nyog ntawm silicon tuaj yeem txhim kho deoxidation.
- Manganese (Mn): 0.30% ~ 0.60% Manganese koom nrog desulfurization thiab txhim kho hardenability, tab sis cov ntsiab lus ntau dhau tuaj yeem txhawb kev npau taws.
- Phosphorus (P) thiab Sulfur (S): Ob qho tib si tsawg dua lossis sib npaug li 0.025%. Ob lub ntsiab lus impurity no zoo li khaws cia ntawm cov ciam teb, ua rau kub brittleness thiab weld tawg. Cov txheej txheem smelting niaj hnub, los ntawm LF refining, tuaj yeem tswj cov sulfur kom qis dua 0.005%.
- Nickel (Ni) thiab tooj liab (Cu): Tsawg dua lossis sib npaug li 0.40% feem. Cov npib tsib xee thiab tooj liab seem tuaj yeem tshwm sim los ntawm cov hlau seem; Cov nyiaj ntau dhau tuaj yeem cuam tshuam tsis zoo rau kev ua haujlwm ntev -.
A335 P91 Boiler Tube Kev Ua Haujlwm Zoo:
Siab -Tsub Muaj Zog: Tensile zog Ntau dua lossis sib npaug ntawm 585MPa, tawm lub zog ntau dua lossis sib npaug rau 415MPa, thiab tsis yog- lub zog elongation ntau dua lossis sib npaug rau 198MPa ntawm 600 degree, ob npaug ntawm cov tsoos P22 steel.
Creep Resistance: Creep zog tshaj 100MPa ntawm 600℃rau 100,000 teev, ua tau raws li qhov yuav tsum tau ua rau lub sijhawm ua haujlwm ntev -.
Corrosion Resistance: Kev tiv thaiv zoo heev rau oxidation thiab siab -kub chav corrosion, haum rau chav kav dej thiab boiler cua sov qhov chaw.
A335 P91 Alloy steel yeeb nkab Daim ntawv thov Scenarios
1. Fais fab kev lag luam: dav siv nyob rau hauv lub ntsiab chav tsev pipelines ntawm supercritical units (tsim siab 26MPa / 605℃). Piv txwv li, nyob rau hauv 1000MW chav tsev ntawm Huaneng Yuhuan Fais Fab Cog, P91 pipelines account rau 35%, txo qhov hnyav los ntawm 20% piv rau cov tshuaj P22.
2. Petrochemical Kev Lag Luam: Hauv cov kav xa hluav taws xob ntawm hydrogenation reactors (qhov kub thiab txias 450 ~ 550 degree), P91 nthuav tawm cov kev tiv thaiv zoo tshaj rau hydrogen-induced cracking (HIC) piv rau P92 steel, ncua kev pab cuam lub neej ntawm ib qhov project refining rau 15 xyoo.
3. Nuclear Fais Fab Kev Lag Luam: Raws li cov khoom siv tseem ceeb rau lub voj voog thib ob ntawm AP1000 units, qhov sib ntxiv ntawm 0.03% Al ntxiv txo qhov nyiam ntawm neutron irradiation embrittlement.
A335 P91 Alloy steel seamless yeeb nkab Hoobkas
