SA671 CF66 Carbon Steel Boiler Steel Yeeb Nkab
Taw qhia
ASTM A671 CF66 yog ib qhohluav taws xob-fusion-welded carbon steel phaj yeeb nkabtsim rausiab -siab thiab siab kub pab, tshwj xeeb categorized rau nwscuam tshuam toughness ntawm qis kub. Nws yog qib sib txawv hauv ASTM A671 specification.
Covnomenclatureyog qhov tseem ceeb:
SWB 671:Lub hauv paus specification rau hluav taws xob -fusion-welded yeeb nkab.
C:Qhia tias cov yeeb nkab yog tsim los ntawmcarbon steel phaj.
F:Ib qho yuav tsum tau ua ntej qhia cov yeeb nkab haum raukev pabcuam ntawm qhov kub tsis tshua muaj hlauthiab tias nwscuam tshuam cov khoomyog ib qho kev xav tau.
66:Sawv cev rauYam tsawg kawg nkaus uas muaj zog ntawm 66 ksi (455 MPa).
Cov"F" npeyog tus tseem ceeb sib txawv. Nws tso cai rau cov yeeb nkab yuav tsum ua tau raws li Charpy V-ntxhiab qhov cuam tshuam qhov tseem ceeb ntawm qhov ntsuas kub qis, ua rau nws tsim nyog rau cov ntawv thov uas qhov ntsuas kub ua haujlwm tuaj yeem poob qis dua ambient, tab sis tsis tas mus rau qib cryogenic.
Cov yam ntxwv tseem ceeb
Khoom siv:Cov pa roj carbon steel, feem ntau yog ua kom zoo -grain xyaum.
Kev tsim khoom:Hluav taws xob-Fusion-Welded (EFW) los ntawm cov hlau phaj.
Cov khoom tseem ceeb: Guaranteed cuam tshuam toughness ntawm qhov ntsuas kub tsawg, ua ke nrog lub zog zoo.
Yuav Tsum Tau Ua: Charpy V- ntsuas qhov cuam tshuamntawm tus neeg yuav khoom- qhov ntsuas kub tshwj xeeb.
Yam Kev Pabcuam Temperature Range:Haum rau ob qho tib siKev pabcuam kub siab (txog ~ 650℃F / 343 degree)thiabqis- kev pabcuam kub qis mus rau qhov ntsuas qhov ntsuas qhov ntsuas kub(piv txwv li, -20℃F / -29 degree, 0℃F / -18 degree).
Daim Ntawv Thov Tseem Ceeb:Cov hlab ntsha siab thiab cov kav dej uas ua haujlwm ntawm kev kub siab tab sis tuaj yeem raug qhov kub thiab txias thaum lub sijhawm kaw, hydro- kuaj nrog dej txias, lossis hauv huab cua txias.
Qauv:ASTM A671 Cov Khoom Siv Hluav Taws Xob
Tshuaj muaj pes tsawg leeg (ASTM A671 CF66,%)
Cov muaj pes tsawg leeg yog tswj xyuas kom muaj zog txaus thiab, qhov tseem ceeb, zoo qis -kub toughness.
| Lub ntsiab | Qhov siab tshaj plaws (%) | Sau ntawv |
|---|---|---|
| Cov pa roj carbon (C) | 0.24 | Txwv kom ntseeg tau tias weldability thiab toughness. |
| Manganese (Mn) | 1.20 | Lub hauv paus tseem ceeb ntxiv dag zog; Mn: C ratio yog optimized rau toughness. |
| Phosphorus (P) | 0.035 | Khaws cia kom qis kom ruaj khov. |
| Sulfur (S) | 0.035 | Khaws qis kom khaws toughness thiab weldability. |
| Silicon (Si) | 0.15 - 0.40 | Deoxidizer. |
| Carbon sib npaug (CE) | Feem ntau Tsawg dua lossis sib npaug rau 0.43 | Tswj kom ntseeg tau zoo weldability yam tsis muaj preheat ntau dhau. |
* Ceebtoom: Cov khoom siv phaj feem ntau yog qhov zoo li qub -cov hlau ua raws li cov lus qhia tshwj xeeb xws li ASTM A516 Qib 70 lossis zoo sib xws.*
Mechanical Properties (Room Temperature)
| Khoom | Tus nqi (Imperial) | Tus nqi (Metric) |
|---|---|---|
| Yield zog (min) | 66 kws | 455 MPa rau |
| Tensile zog (min) | 7 5 ksg | 517 MPa ua |
| Elongation (min,%) | 19 | 19(hauv 2 nti / 50mm) |
Impact Toughness (Yuav tsum tau yuav tsum tau)
Qhov no yog qhov yuav tsum tau ua rau cov qib "F". Qhov tseeb qhov tseeb thiab ntsuas kub yog teev los ntawm tus neeg yuav khoom.
| Parameter | Yam yuav tsum tau muaj (Piv txwv) | Sau ntawv |
|---|---|---|
| Txoj Kev Xeem | Charpy V-notch (CVN) | Txheem rau ASTM A370. |
| Kev ntsuas kub | Tus neeg yuav khoom Specified(piv txwv li, -20℃F / -29 degree, 0℃F / -18 degree) | Yuav tsum tau hais nyob rau hauv qhov kev txiav txim. Nws txhais qhov tsawg kawg nkaus tsim hlau kub. |
| Yam tsawg kawg nruab nrab zog | Feem ntau 20 ft-lb (27 J) rau 3 tus qauv | Feem ntau yuav tsum tau rau ntau lub nkoj siab codes. |
| Yam tsawg kawg nkaus tus nqi | Feem ntau 15 ft -lb (20 J) | Tsis muaj ib qho qauv yuav tsum qis dua tus nqi no. |
Nco tseg: Cov yeeb nkab tuaj yeem muab tau raws li -welded lossis kev ntxhov siab-txo qis, tab sis qhov xwm txheej yuav tsum yog raws li qhov yuav tsum tau ua.
Kev kho cua sov
Base Phaj:Cov phaj steel feem ntau yog muab rau hauvnormalized mobkom ua tiav qhov zoo -grained microstructure conducive rau zoo toughness.
Cov yeeb nkab tiav:Tom qab-weld heat treatment (PWHT) los yog kev ntxhov siab yogfeem ntau thovmus rau weld seam kom ntseeg tau tias qhov vuam thiab cua sov -Teb chaws cuam tshuam (HAZ) kuj ua tau raws li qhov yuav tsum tau ua kom nruj. Kev kho cua sov tshwj xeeb yog ib feem ntawm cov txheej txheem tsim nyog.
Tsis yog -Kev Tshawb Fawb Kev Ua Phem (NDE)
Siab -NDE zoo yog tus qauv rau cov kav dej tseem ceeb no.
Radiography (RT):Lub longitudinal seam weld yog100% radiographed(feem ntau ASTM A671Chav Kawm 12).
Kev Ntsuas Ultrasonic (UT):Tej zaum yuav raug teev rau ntxiv qhov tsis txaus ntseeg.
Kev Ntsuas Hydrostatic:Yuav tsum tau ua rau txhua lub yeeb nkab.
Tej kev siv
Cov nkoj thiab cov boilers nyob rau hauv txias huab cua:Qhov twg cov khoom raug raug rau lub caij ntuj no tsis tshua muaj kub.
Hydrotest ntawm Cov Khoom Siv Kub Kub:Siv cov dej txias, uas tuaj yeem txias cov hlau hauv qab nws qhov ntsuas kub tsim thaum lub sijhawm kuaj.
Tub yees Cog Piping & Vessels:Rau ammonia lossis Freon systems.
Txheej txheem Piping hauv Petrochemical Cog:Qhov ntawd yuav pom qhov kub thiab txias qee zaus.
** Cov Cuab Yeej Siv Hluav Taws Xob thiab lwm yam
