Txheej txheem cej luam: Dab tsi yog SA-213 T11?
SA-213 T11yog tus qauv specification los ntawm lubAmerican Society for Testing thiab Materials (ASTM)rau seamless ferritic thiab austenitic steel boiler, superheater, thiab tshav kub -exchanger tubes.
Qhov kev xaiv "T11" yog hais txog cov tshuaj muaj pes tsawg leeg thiab qib khoom siv. Nws yog qis- hlau alloy uas muajchromium (Cr)thiabMolybdenum (Mo), uas muab nws zoo dua lub zog thiab kub tsis kam tshaj carbon steel.
Cov yam ntxwv tseem ceeb & kev siv
Khoom siv:Tsawg- hlau alloy (Chromium-Molybdenum)
Khoom tseem ceeb:Zoocreep zog(tsis kam mus rau deformation nyob rau hauv ntev -lub sij hawm raug rau siab kub thiab txias).
Oxidation Resistance:Zoo dua cov pa roj carbon steel vim muaj cov ntsiab lus chromium, cia nws tiv taus qhov ntsuas kub ntawm qhov kub siab dua.
Weldability:Zoo, tab sis yuav tsum tau ua ntej - cua sov thiab tom qab -weld heat treatment (PWHT) kom tsis txhob tawg.
Cov ntawv thov tseem ceeb:
Boiler Tubes:Cov dej- cov phab ntsa txias thiab lwm qhov ntawm lub boiler qhov kub siab.
Superheater Tubes:Cov raj uas txuas ntxiv ua kom sov lub chav tom qab nws tau tawm ntawm lub boiler nruas, kev khiav hauj lwm ntawm qhov kub thiab txias siab tshaj hauv qhov system.
Thaum tshav kub kub Exchangers:Hauv cov kev pabcuam uas xav tau lub zog siab dua li carbon steel tuaj yeem muab tau.
Chemical Composition (%)
Cov khoom xyaw yog nruj me ntsis tswj los ntawm ASTM A213 tus qauv. Hauv qab no yog ib feem ntau:
| Lub ntsiab | Kev sib xyaw (%) |
|---|---|
| Cov pa roj carbon (C) | 0.05 - 0.15 |
| Manganese (Mn) | 0.30 - 0.60 |
| Phosphorus (P) | max . 0.025 |
| Sulfur (S) | max . 0.025 |
| Silicon (Si) | 0.50 - 1.00 |
| Chromium (Cr) | 1.00 - 1.50 |
| Molybdenum (hli) | 0.44 - 0.65 |
Vim li cas qhov kev sib xyaw no tseem ceeb:
Chromium (Cr):Txhim kho oxidation (scaling) thiab corrosion kuj.
Molybdenum (Molybdenum):Ua kom muaj zog ntawm qhov kub thiab txias thiab txhim kho creep kuj.
Mechanical Properties
Cov khoom siv kho tshuab tau teev tseg rau cov khoom siv hauv cov txheej txheem kev kho cua sov thiab kho cua sov.
| Khoom | Kev xav tau |
|---|---|
| Tensile zog | min . 415 MPa (60,000 psi) |
| Yield zog | min . 205 MPa (30,000 psi) |
| Elongation | min. 30% (ntawm 2-nti ntsuas qhov ntev) |
Qhov kub thiab txias
Qhov kub thiab txias:Mus txog~ 565℃(~ 1050℃F)rau kev pabcuam tsis tu ncua. Tshaj li qhov no, nws lub zog poob qis heev, thiab lwm qib zoo li T22 (2.25% Cr) lossis stainless hlau yog nyiam.
Yam tsawg kawg nkaus kub:Haum rau down mus-29 ° F (-20 ° F). Rau qhov ntsuas kub qis dua, yuav tsum tau kuaj qhov cuam tshuam.
Sib piv nrog Lwm Cov Qib Siab
| Qib | Lub Npe | Kev sib xyaw | Ntsiab Feature | Hom Max Temp |
|---|---|---|---|---|
| SA-213 T11 | 1.25Cr-0.5Mo | 1.25% Cr, 0.5% Mo | Zoo zog & oxidation kuj | ~ 565℃(1050℃F) |
| SA-213 T22 | 2.25Cr-1Mo | 2.25% Cr, 1.0% Mo | Zoo dualub zog & oxidation dua T11 | ~ 580℃(1075℃F) |
| SA-213 T9 | 9Cr-1Mo | 9% Cr, 1% Mo | Txawm tias siab dua corrosion / oxidation kuj | ~ 650℃(1200℃F) |
| SA-213 T91 | 9Cr-1Mo-V | 9% Cr, 1% Mo, V, Nb | Siab -lub zog creep-resistant steel | ~ 650℃(1200℃F) |
| SA-213 TP 304 | 304 Stainless hlau | 18% Cr, 8% Ni | Zoo heev corrosion kuj, siv rau high temps | ~ 815℃(1500℃F) |
Fabrication thiab Welding Considerations
Ua haujlwm nrog T11 yuav tsum tau saib xyuas tshwj xeeb:
Ua ntej- cua sov: Yuav tsum tau.Feem ntau nyob rau hauv qhov ntau ntawm200℃- 300℃(400℃F - 575℃F)los tiv thaiv hydrogen-induced txias cracking.
Tshaj tawm -Weld Heat Treatment (PWHT): Yuav tsum tau.Ua ntawm~ 1150℃F - 1350℃F (620℃- 730} degree)rau:
Txo cov kev ntxhov siab uas seem.
Temper lub hard martensitic microstructure nyob rau hauv tshav kub- cuam tshuam cheeb tsam (HAZ).
Restore ductility thiab corrosion kuj.
Welding Consumables:Electrodes zoo liE8018-B2los yog muab tub lim hlau zoo liER80S -B2feem ntau yog siv los ua kom haum lub hauv paus hlau qhov muaj pes tsawg leeg thiab cov khoom.
Cov ntsiab lus
SA-213 T11 yog cov hlau ua haujlwm hlau hauv kev tsim hluav taws xob thiab kev lag luam petrochemical.Nws muab qhov sib npaug zoo ntawm siab - kub lub zog, oxidation tsis kam, thiab fabricability, ua rau nws zoo tagnrho rau qhov tseem ceeb ntawm lub siab xws li superheater thiab boiler raj uas ua hauj lwm tshaj lub peev xwm ntawm carbon steel tab sis tsis xav tau tus nqi kim dua - alloy los yog stainless hlau.
