Txheej txheem cej luam: S50400 yog dab tsi?
S50400 yog lub npe los ntawmASTM A213 txujrauSeamless Ferritic thiab Austenitic Steel Boiler, Superheater, thiab Thaum tshav kub kub -Txiv Tubes.
Hom Lub Npe:Nws yog feem ntau paub los ntawm nwsUNS (Unified Numbering System)npe,S50400, los yog nwsHom kev lag luam npe, Qib 502.
Alloy Hom:Qhov no yog ibnruab nrab - carbon steelnrog kwv yees0.50% carbonthiab0.50% molybdenum. Nws yog ibchromium-molybdenum (Cr-Mo) hlau, tshwj xeeb a0.5Cr-0.5Mohlau alloy.
Ntsiab Specifications thiab tshuaj muaj pes tsawg leeg
S50400 cov kav dej yog tsim los ua kom tau raws li cov qauv nruj kom ntseeg tau tias kev ua tau zoo nyob rau hauv siab - kub thiab siab - ib puag ncig siab.
1. Cov qauv siv tau:
ASTM A213 Cov Lus Qhia:Thawj tus qauv rau seamless raj siv nyob rau hauv boilers thiab tshav kub exchangers.
ASTM A335 Txuj:Rau seamless ferritic alloy - steel yeeb nkab rau siab - kev pabcuam kub (siv rau cov kav dej, qhov A213 yog rau cov raj).
ASME SA-213/SA-335:ASME code versions ntawm cov qauv no, uas yuav tsum tau siv rau hauv kev tsim hluav taws xob cog hauv Asmeskas thiab ntau lub tebchaws.
2. Chemical Composition (ASTM A213 Requirements):
| Lub ntsiab | Kev sib xyaw (%) |
|---|---|
| Cov pa roj carbon (C) | 0.10 - 0.20 |
| Manganese (Mn) | 0.30 - 0.60 |
| Phosphorus (P) | 0.025 max |
| Sulfur (S) | 0.025 max |
| Silicon (Si) | 0.10 - 0.30 |
| Chromium (Cr) | 0.50 - 0.81 |
| Molybdenum (hli) | 0.44 - 0.65 |
Lus Cim: Cov ntsiab lus carbon qis dua lub npe "Qib 502" tej zaum yuav qhia, raws li nws tau ua kom zoo dua lub sij hawm los txhim kho weldability thaum tuav lub zog.
3. Mechanical Properties (ASTM A213 Requirements):
| Khoom | Tus nqi |
|---|---|
| Tensile zog | 415 MPa (60,000 psi) min |
| Yield zog | 205 MPa (30,000 psi) min |
| Elongation | 30% min (hauv 2 nti) |
Cov yam ntxwv thiab qhov zoo
S50400 seamless yeeb nkab yog xaiv rau nws cov khoom tshwj xeeb:
Zoo heev High -Temperature Strength:Qhov sib ntxiv ntawm molybdenum ho nce lub zog ntawm cov hlau ntawm qhov kub thiab txias, tiv thaiv creep (slow deformation nyob rau hauv tas li kev ntxhov siab).
Zoo Creep Resistance:Nws tuaj yeem tiv taus ntev - lub sij hawm raug rau kev ntxhov siab thiab qhov kub thiab txias yam tsis muaj deformation tseem ceeb.
Txhim kho Oxidation Resistance:Muaj kev tiv thaiv zoo dua rau kev ntsuas (oxidation) hauv chav ua haujlwm piv rau carbon steels.
Weldability:Nws muaj kev ncaj ncees weldability, txawm hais tias nws yuav tsum tau ua ntej- cua sov thiab tom qab-weld kev kho cua sov (PWHT) los tiv thaiv kev tawg thiab kho cov khoom siv hluav taws xob hauv tshav kub- thaj chaw cuam tshuam (HAZ).
Tus nqi -Kev ua tau zoo:Rau nws qhov kev ua tau zoo, nws yog qhov kev xaiv pheej yig dua piv rau qib siab dua -qib alloys xws li T11 (1.25Cr-0.5Mo) lossis T22 (2.25Cr-1Mo).
Cov ntawv thov siv
S50400 seamless kav feem ntau yog siv nyob rau hauv siab - kub, siab - ib puag ncig siab. Lawv cov ntawv thov tseem ceeb suav nrog:
Fais fab Generation Boilers:Rau superheater thiab reheater raj, qhov twg chav yog rhuab mus rau nws qhov kub tshaj plaws.
Thaum tshav kub kub Exchangers:Hauv cov tshuab uas hloov cov cua sov ntawm cov kua dej ntawm qhov kub thiab txias.
Fossil Fuel Power Plants:Cov khoom siv txheem rau ntau yam siab -kub piping thiab tubing systems.
Petrochemical Kev Lag Luam:Nyob rau hauv cov txheej txheem piping thiab rhaub tubing qhov kub siab tab sis tsis heev txaus yuav tsum tau kim kim stainless hlau los yog npib tsib xee alloys.
Pipelines rau High -Kub Fluids:Kev thauj cov roj kub, chav dej, lossis lwm yam txheej txheem dej.
Sib piv nrog Lwm Cov Qib Siab
Nws yog qhov pab tau kom pom qhov twg S50400 haum ntawm lwm cov Cr-Mo qib:
| Qib / UNS | Lub Npe | Kev sib xyaw ua ke | Ntsiab Feature |
|---|---|---|---|
| S50400 | T5 / Qib 502 | 0.5Cr-0.5Mo | Zoo sib npaug ntawm tus nqi, lub zog, thiab temp. tsis kam. |
| K11597 | T11 | 1.25Cr-0.5Mo | Zoo oxidation & corrosion kuj dua T5. |
| K21590 | T22 | 2.25Cr-1Mo | Superior zog thiab corrosion kuj; kev lag luam tus qauv rau ntau qhov kev pabcuam siab -temp. |
| S30400 | 304H | 18Cr-8 Ni | Austenitic stainless hlau rau siab dua corrosion kuj thiab temp. zog. |
Thaum twg xaiv S50400 dhau T22?S50400 feem ntau xaiv thaum cov kev pabcuam hnyav rau cov pa roj carbon steel tab sis tsis hnyav txaus los ua pov thawj tus nqi siab dua ntawm T22. Nws yog qhov nruab nrab - kev xaiv hauv av.
Manufacturing thiab Fabrication Considerations
Kev kho cua sov:S50400 cov kav dej tau muab rau hauvnormalized thiab temperedmob kom ua tiav qhov xav tau microstructure thiab mechanical zog.
Vuam:Yuav tsum tau ceev faj cov txheej txheem.
Preheat:Qhov tseem ceeb los tiv thaiv hydrogen-induced cracking.
Electrodes:Siv cov khoom siv hluav taws xob sib xyaw ua ke (xws li E505-XX rau SMAW).
Tshaj tawm -Weld Heat Treatment (PWHT):Yuav tsum tau txo kev ntxhov siab thiab npau taws rau HAZ. Qhov kub ntawm PWHT yog nyob ib puag ncig1250℃F (677 degree).
Xaus
S50400 (Qib 502) Seamless Steel Yeeb Nkabyog ib qho txhim khu kev qha thiab zoo- tsimqis-chromium molybdenum alloytshwj xeeb engineered rau siab -kub kev pab cuam. Nws zoo heev creep zog thiab zoo oxidation kuj ua rau nws yog ib qho tseem ceeb cov khoom nyob rau hauv lub tsim hluav taws xob thiab petrochemical kev lag luam rau cov khoom tseem ceeb xws li superheater raj thiab siab -kub piping, muab ib tug zoo meej tshuav nyiaj li cas ntawm kev ua tau zoo thiab tus nqi rau nws lub hom phiaj daim ntawv thov ntau yam.
