ASTM A178 Hluav taws xob Resistance Welded Steel Tube
Khoom Specification
ASTM A178 yog ib qho kev qhia tshwj xeeb uas suav nrog hluav taws xob -tsis kam-welded carbon steel thiab carbon-manganese steel boiler thiab superheater raj. Cov raj no feem ntau yog siv nyob rau hauv siab - daim ntawv thov kub, xws li hauv boilers, superheaters, thiab tshav kub exchangers. Cov kev qhia tshwj xeeb ua kom cov raj ua tau raws li qee yam khoom siv thiab tshuaj lom neeg, ua rau lawv tsim nyog rau qhov xav tau ib puag ncig.
Ntsiab nta
Kev tsim khoom: Cov hlab ntsha yog tsim los ntawm kev siv hluav taws xob tiv thaiv vuam (ERW) txheej txheem, uas ua kom muaj zog thiab zoo sib xws weld seam.
Ntau yam: Haum rau siab -kev siv kub, tshwj xeeb tshaj yog nyob rau hauv boilers thiab superheaters.
Corrosion Resistance: Muaj kev tiv thaiv zoo rau corrosion, ua rau nws zoo tagnrho rau siv nyob rau hauv ib puag ncig uas muaj noo noo thiab cua sov.
Tus nqi -Cov: Cov txheej txheem ERW yog qhov ua tau zoo thiab tus nqi- ua tau zoo, ua rau ASTM A178 raj yog qhov kev xaiv pheej yig rau ntau daim ntawv thov.
Quality Assurance: Cov kev qhia tshwj xeeb suav nrog kev sim nruj kom ntseeg tau tias cov raj ua tau raws li cov qauv tsim nyog thiab tshuaj lom neeg.
Tshuaj muaj pes tsawg leeg
Cov tshuaj muaj pes tsawg leeg ntawm ASTM A178 raj yog qhov tseem ceeb rau kev ua kom lawv cov kev ua tau zoo nyob rau hauv siab - qhov kub thiab txias. Cov lus hauv qab no qhia txog cov tshuaj muaj pes tsawg leeg:
| Element | Kev sib xyaw (%) |
| Cov pa roj carbon (C) | 0.06 - 0.18 |
| Manganese (Mn) | 0.27 - 0.93 |
| Phosphorus (P) | Tsawg dua lossis sib npaug li 0.035 |
| Sulfur (S) | Tsawg dua lossis sib npaug li 0.035 |
Mechanical Properties
ASTM A178 cov raj yuav tsum ua kom tau raws li cov khoom siv tshwj xeeb kom ntseeg tau tias lawv tuaj yeem tiv taus qhov kub thiab txias ntawm lawv cov ntawv thov. Cov lus hauv qab no nthuav tawm cov khoom no:
| Khoom | Tus nqi |
| Tensile zog | 47,000 psi min |
| Yield zog | 26,000 psi min |
| Elongation | 30% min |
Lub cev muaj zog
Lub cev muaj zog ntawm ASTM A178 cov hlab ntsha pab txhawb rau lawv qhov tsim nyog rau siab -kev siv kub:
| Khoom | Tus nqi |
| Qhov ntom | 7.85 g / cm³ |
| Melting Point | 1425-1540 degree |
| Thermal conductivity | 51.9 W/m·K |
Txheej Txheem Kev Ua Haujlwm
Kev ua tau zoo ntawm ASTM A178 raj thaum ua haujlwm yog qhov tseem ceeb rau lawv daim ntawv thov hauv ntau qhov kev lag luam:
| Txheej txheem | Kev ua tau zoo |
| Weldability | Zoo heev |
| Machineability | Zoo |
| Formability | Zoo |
Qib Steel
ASTM A178 raj muaj nyob rau hauv ntau qib, txhua tus tsim los ua kom tau raws li cov kev cai tshwj xeeb:
Qib A: Qib theem pib nrog cov khoom siv kho tshuab.
Qib C: Cov ntsiab lus ntawm manganese ntau dua rau kev txhim kho lub zog.
Qib D: Txhim kho txhua yam khoom siv rau kev thov ntau dua.
Txhua qib yog tsim los ua kom tau raws li cov kev xav tau tshwj xeeb ntawm cov ntawv thov sib txawv, ua kom muaj kev ua tau zoo thiab kev ntseeg tau.
Daim ntawv thov
ASTM A178 raj siv dav hauv:
Boilers: Raws li cov kav dej thiab cov raj hluav taws kub hauv chav boilers.
Superheaters: Rau kev xa cov cua sov los ntawm cov roj combustion mus rau chav.
Thaum tshav kub kub Exchangers: Hauv ntau cov txheej txheem kev lag luam kom hloov cov cua sov ntawm cov kua.
Cov qhab nia xaiv tau
Thaum ASTM A178 yog qhov kev xaiv nrov, muaj lwm cov qib uas yuav tsim nyog nyob ntawm cov kev cai tshwj xeeb:
ASTM A179 Cov khoom lag luam: Seamless txias-kos qis- carbon steel tshav kub-exchanger thiab condenser raj.
ASTM A192 Cov Lus Qhia Tshwj Xeeb: Seamless carbon steel boiler raj rau siab - kev pabcuam siab.
ASTM A 210 Cov Lus Qhia: Seamless nruab nrab - carbon steel boiler thiab superheater raj.
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