20 Carbon Steel Boiler Steel Pipe yog dab tsi?
"20 Carbon Steel" yog hais txog qib tshwj xeeb ntawm qis- carbon steel txhais los ntawm nws cov tshuaj muaj pes tsawg leeg, qhov twg cov ntsiab lus carbon yog kwv yees li 0.20%.
"Boiler Steel Pipe" qhia tias cov yeeb nkab no yog tsim los ua kom tau raws li cov qauv nruj rau kev siv hauv siab - siab thiab siab - cov ntawv siv kub, xws li boilers, superheaters, thiab cov cua kub exchangers.
Yog li ntawd,ASTM A179 / A192 Qib 20yog qhov tshwj xeeb tshaj plaws rau hom yeeb nkab no. Nws yog seamless txias-kos qis- cov pa roj carbon steel raj tshwj xeeb tsim los rau kev sib pauv cua sov thiab cov kev pabcuam condenser.
Cov yam ntxwv tseem ceeb & Khoom
Cov ntsiab lus carbon tsawg (~ 0.20%):
Weldability zoo heev:Nws tuaj yeem ua tau yooj yim welded siv txhua txoj hauv kev yam tsis muaj kev ceev faj tshwj xeeb (xws li ua ntej- cua sov lossis tom qab- vuam cov cua sov), tsis zoo li cov pa roj carbon ntau dua.
Zoo Ductility thiab Formability:Nws tuaj yeem khoov thiab tsim yam tsis muaj cracking.
Zoo sib xws:Tsis nyuaj lossis muaj zog li nruab nrab lossis siab - carbon steels.
Seamless Kev Tsim Kho:
Cov yeeb nkab yog tsim los ntawm kev tho lub pob zeb ntawm cov hlau, tsim cov yeeb nkab uas tsis muaj welded seams. Qhov no yog qhov tseem ceeb rau kev siv siab -siab vim nws tshem tawm qhov tsis muaj zog.
Txias -Drawn txheej txheem:
Cov kav dej yog txias- kos kom ua tiav qhov ntev (sab nraud txoj kab uas hla thiab phab ntsa tuab), ua kom tiav qhov chaw du, thiab txhim kho txhua yam muaj zog.
High -Tsub Ua Haujlwm:
Nws yog tsim los tswj nws lub zog thiab tiv thaiv oxidation (scaling) ntawm qhov kub siab uas feem ntau pom nyob rau hauv boiler thiab siab hlab ntsha kev pab.
Common Specifications thiab Standards
Cov kav dej boiler tau tswj hwm los ntawm cov qauv thoob ntiaj teb kom muaj kev nyab xeeb thiab ua haujlwm tau zoo. Cov qauv tseem ceeb tshaj plaws rau Qib 20 carbon steel yog:
ASTM A179 / A192 Cov Lus Qhia:Qhov no yog thawj tus qauv rauSeamless Txias-Kaw Qes-Carbon Steel Thaum tshav kub kub-Exchanger thiab Condenser Tubes. A192 feem ntau muaj qhov xav tau siab dua me ntsis dua li A179.
ASME SA179/SA192:Zoo ib yam li ASTM cov qauv tab sis tau txais kev pom zoo los ntawm American Society of Mechanical Engineers rau kev siv hauv code- tswj kev tsim kho (xws li ASME Boiler thiab Pressure Vessel Code).
DIN 17175 / EN 10216-2:Cov qauv European uas npog cov raj zoo sib xws rau lub hom phiaj siab. Qib sib npaug yuav zoo liP235GH(nrog rau kev txwv tshuaj lom neeg sib txawv, tab sis cov ntawv thov zoo sib xws).
GB 3087: ib.Suav tus qauv rau seamless steel raj rau boiler lub hom phiaj. Qib sib npaug yog20G("G" sawv cev rauGao Yaj, lub ntsiab lus siab).
Chemical Composition (Hom rau ASTM A179)
| Element | Cov ntsiab lus (%) |
|---|---|
| Cov pa roj carbon (C) | 0.06 - 0.18% (Max) |
| Manganese (Mn) | 0.27 - 0.63% |
| Phosphorus (P) | 0.048% Max |
| Sulfur (S) | 0.058% Max |
| Silicon (Si) | (Tsis teev, tab sis feem ntau qis) |
* Ceeb Toom: Qib "20 Carbon" tiag tiag hauv lwm lub tshuab (xws li Suav 20G) tej zaum yuav muaj cov ntsiab lus carbon ze rau 0.17-0.24%.*
Mechanical Properties (Hom rau ASTM A179)
| Khoom | Tus nqi |
|---|---|
| Tensile zog | Ntau dua lossis sib npaug rau 325 MPa (47,000 psi) |
| Yield zog | Ntau dua lossis sib npaug rau 180 MPa (26,000 psi) |
| Elongation | Ntau dua lossis sib npaug li 35% |
Cov ntawv thov tseem ceeb
Hom yeeb nkab no tsuas yog siv rau hauv kev hloov hluav taws xob thiab siab -cov khoom siv:
Hluav Taws Kub Boilers:Qhov twg cov pa roj kub dhau los ntawm cov hlab ntsha, uas nyob ib puag ncig los ntawm dej.
Dej Tube Boilers:Qhov twg dej dhau los ntawm cov hlab ntsha, uas yog rhuab los ntawm cov pa sab nraud.
Thaum tshav kub kub Exchangers:Hloov cov cua sov ntawm ib qho dej mus rau lwm qhov.
Condenser:Hloov cov pa rov qab rau hauv dej.
Superheaters:Cua sov chav mus rau qhov kub siab heev kom nce thermal efficiency.
Economizers:Ua ntej- cua sov feedwater siv pov tseg cov cua sov los ntawm flue gases.
Qhov zoo thiab qhov tsis zoo
Qhov zoo:
Tus nqi -zoo:Tsawg- carbon steel kuj pheej yig.
Yooj yim rau Fabricate thiab Weld:Simplifies manufacturing thiab ntawm -site installation.
Zoo thermal conductivity:Ua haujlwm zoo rau kev hloov cua sov.
Lub zog txaus rau kev pabcuam:Muab lub zog txaus rau ntau lub boiler thiab kev siv siab.
Qhov tsis zoo:
Tsawg Corrosion Resistance:Yuav xeb yog tsis tiv thaiv los ntawm noo noo; tsis haum rau corrosive kua yam tsis muaj kev kho mob.
Lub zog qis:Tsis haum rau siab heev - siab los yog siab - cov ntawv thov kev nyuaj siab qhov twg cov hlau alloy yuav tsum tau.
Kev txiav txim siab tseem ceeb rau cov neeg yuav khoom thiab cov neeg siv khoom
Ntawv pov thawj:Nco ntsoov xyuas cov khoom los nrog aMill Test Certificate (MTC)los yogMaterial Test Report (MTR)uas txheeb xyuas nws cov tshuaj thiab cov khoom siv kho tshuab ua raws li tus qauv txiav txim.
Tsis yog -Kev Ntsuas Kev Puas Tsuaj (NDT):Boiler hlab feem ntau raug kev sim xws li kev sim hydrostatic (kom kuaj xyuas cov dej ntws), eddy tam sim no kuaj, los yog kuaj ultrasonic kom ntseeg tau.
Dimensional Tolerances:Boiler tubes muaj kev zam nruj rau sab nraud (OD) thiab phab ntsa thickness (WT). Paub meej tias cov no ua tau raws li koj cov kev xav tau tsim.
Hauv cov ntsiab lus,20 Carbon Steel Boiler Yeeb Nkab (ASTM A179 / A192)yog ib qho tseem ceeb, txhim khu kev qha, thiab cov khoom siv dav siv rau kev sib pauv cua sov thiab kev siv siab uas lub zog siab tsis yog qhov yuav tsum tau ua, tab sis weldability, formability, thiab kev ua haujlwm zoo ib yam ntawm qhov kub nruab nrab yog qhov tseem ceeb.
