A387 Gr 11 Cl 2yog ib tug specification rau chrome-molybdenum (Cr-Mo) alloy steel phaj siv nyob rau hauv welded boilers thiab siab hlab ntsha rau siab kub kev pab cuam, muab zoo corrosion / oxidation kuj, weldability, thiab lub zog ntawm kub kub. Qhov "Class 2" qhia tias muaj zog dua thiab yuav tsum muaj qhov ua haujlwm zoo thiab tsis zoo, tsis zoo li "Class 1".
A387 GR 11 CLASS 2 Phaj Specification
| Khoom | Specification |
|---|---|
| Qib | ASTM A387 Gr 11 CL.2 Alloy Steel Phaj |
| Txuj | ASTM A 387 / ASME SA387 / ASTM A387 / ASTM A387 / ASTM A387 / ASTM A387 / ASTM A387 / ASTM A387 / ASTM A387 / ASTM A387 / ASTM A387 / ASME SA387 / ASTM A387 / ASTM A387 / ASME SA387 / ASTM A387 / ASTM A387 / ASTM A387 / ASTM A387 / ASTM A387 / ASTM A387 / ASTM A387 / ASTM A387 / ASTM A387 / ASTM A387 / ASTM A387 / ASTM A387 / ASME SA387 / ASTM A387) |
| Dav | 1000mm - 4500 hli |
| Thickness | 5mm - 150 hli |
| Ntev | 3000mm - 18000 hli |
| Impact Tested | -52 ° C |
| Txheej txheem | Kub-Rolled (HR) |
ASTM A387 GR 11 CLASS 2 Cov tshuaj muaj pes tsawg leeg
| Qib | C | Mn | P | S | Si | Cr | Mo |
| A387 Gr.11 | 0.05-0.17 | 0.40-0.65 | 0.035 | 0.035 | 0.50-0.80 | 1.00-1.50 | 0.45-0.65 |
ASTM A387 GR 11 CLASS 2 Mechanical Properties
| Chav kawm | Tensile (MPa) | Tawm tswv yim (MPa) | Elong. (50 hli) | Elong. (200 hli) | Reduc'n ntawm Cheeb Tsam * |
| Chav Kawm 1 | 415 - 585 | 240 feeb | 22% min | 19% min | - |
| Chav kawm 2 | 515 - 690 | 310 min | 22% min | 18% min | - |
Qib sib npaug
| Lub teb chaws | Teb chaws USA | Teb chaws Europe | Lub teb chaws Yelemees | ENGLAND | FRANCE | RUSSIA |
| STANDARDS | ASTM | TS EN 10028 | DIN | BS | TIAB SA 36206 | GOST |
| Qib 11 | A387 | 13CrMoSi5-5 | - | 621B | - |
Kev tsim thiab kev siv thev naus laus zis muaj xws li hauv qab no:
1. Steelmaking & Refining
Melting txheej txheem: Nws yog tsim los siv hluav taws xob Arc rauv (EAF) ua raws li Ladle Refining (LF) thiab Nqus Degassing (VD). Cov txheej txheem no tseem ceeb heev kom txo qis impurities xws li Sulfur (S), Phosphorus (P), thiab cov kab mob tsis zoo (xws li Sb, Sn, As), uas yuav pab txo qis kev kub ntxhov.
Casting: Feem ntau ua los ntawm Nruam Casting lossis ingot casting ua raws li kub dov.
2. Kev kho cua sov (Cov txheej txheem tseem ceeb tshaj plaws)
Raws li ASTM A387 tus qauv, Chav Kawm 2 daim hlau yuav tsum tau txais kev kho cua sov tshwj xeeb kom ua tiav cov khoom siv kho tshuab uas xav tau (siab dua tensile zog dua Class 1):
Normalizing + Tempering (N + T):
Normalizing: Ua kom sov li ntawm 900-950℃(1650-1740℃F) thiab txias hauv huab cua kom kho cov qauv nplej.
Tempering: Yuav tsum tau ua ntawm qhov kub tsawg kawg nkaus ntawm 620℃(1150℃F), feem ntau ntawm 650℃thiab 750 degree, kom ua tiav qhov xav tau toughness thiab ductility.
Quenching + Tempering (Q + T): Ua kom txias txias (kua quenching) tau tso cai yog tias pom zoo, ua raws li tempering.
3. Vuam txheej txheem
Consumables: Tsawg-hydrogen vuam consumables txuam 1.25%Cr-0.5%Mo chemistry yuav tsum.
Preheating: Preheating yog qhov yuav tsum tau ua (feem ntau yog 150℃txog 250 degree) txhawm rau tiv thaiv kev tawg vim yog cov khoom siv hardenability.
Tom qab-Kev Kho Hniav Kub Kub (PWHT): Qhov tseem ceeb rau kev tshem tawm kev ntxhov siab thiab rov ua kom lub cev muaj zog hauv thaj chaw kub ntxhov (HAZ). Hom PWHT kub yog li ntawm 650℃txog 700 degree.
4. Txiav thiab sib sau
Txiav: tuaj yeem ua tiav ntawm nplaim taws (Oxy- roj) Txiav, Plasma Txiav, lossis Laser Txiav.
Kev tsim: tuaj yeem ua tau txias lossis kub tsim. Yog tias Kev Ua Kub Kub tau ua tiav, cov khoom siv yuav tsum tau ua tiav tag nrho rov qab- kev kho cua sov (Normalizing thiab Tempering) kom ntseeg tau tias cov khoom siv kho tau rov qab los.
5. Kev Sib Piv Cov Lus Qhia Tshwj Xeeb (Class 2)
Piv nrog rau Chav Kawm 1, Chav Kawm 2 txheej txheem tsom mus rau kev ua tiav lub zog tensile siab dua (515–690 MPa lossis 75–100 ksi) los ntawm kev tswj kom txias thiab tempering mus.
daim ntawv thov
1. Petrochemical thiab Roj & Roj Kev Lag Luam
Qhov no yog qhov chaw siv ntau tshaj plaws vim yog cov khoom siv tiv thaiv hydrogen-induced cracking and sour gas (H₂S) ib puag ncig.
Reactors: Siv nyob rau hauv hydrogenation reactors thiab hydrocracking units.
Cov nkoj ua haujlwm: siab- cov khoom sib cais, cov kab sib cais, thiab cov roj- tuav cov tshuab.
Cia: Loj - lub tank loj rau siab - cov kua dej kub thiab roj.
2. Kev tsim hluav taws xob
Nws thermal stability ua rau nws yog ib qho qauv rau cov tshuab raug rau lub zog siab.
Boiler Cheebtsam: Boiler nruas, steam headers, thiab siab -kub piping systems.
Turbines: Qhov tseem ceeb rau chav thiab roj turbines.
Nuclear Fais Fab: Siv nyob rau hauv nuclear reactor siab hlab ntsha thiab siab - siab zog chav generators.
3. Siab -Tsuas Kub Txias Txias
Thaum tshav kub kub Exchangers: Tshwj xeeb plhaub- thiab- raj thiab siab - cov cua kub exchangers uas tau mus tas li thermal cycling.
Ducting: Siab -kub muaj ducting systems.
4. Tshwj xeeb Fittings thiab Hardware
Vim tias nws yog lub siab- nkoj- qib steel, nws kuj yog tsim rau hauv me me tab sis tseem ceeb cov khoom siv rau cov tshuab pressurized:
Piping Systems: Flanges, li qub, yeeb nkab clamps, thiab siab - cov kav dej siab.
Lub tog raj kheej: Siab - siab muaj lub tog raj kheej.
Tau txais cov nqe lus hais txog A387 GR 11 CLASS 2, Hu rau GNEE Steel.
NDT txoj kev twg yog qhov tsim nyog rau A387 Gr 11 CL 2?
Cov txheej txheem ntau: kev kuaj ultrasonic (UT) rau qhov tsis xws luag sab hauv, sib nqus particle (MT) thiab kua penetrant (PT) rau qhov tsis zoo, thiab radiography (RT) yog xav tau.
Dab tsi yog qhov hardness txwv ntawm A387 Gr 11 CL 2 tom qab PWHT?
Qhov siab tshaj plaws Brinell hardness (HBW) yog 207 tom qab PWHT, tiv thaiv cov tawv nqaij ntau dhau uas yuav ua rau tawg thiab ua kom muaj kev ntseeg tau ntawm cov qauv.
A387 Gr 11 CL 2 puas tuaj yeem txias- tsim?
Nws tuaj yeem ua kom txias - tsim nrog cov txheej txheem tsim nyog, tab sis yuav tsum tau preheating rau cov phaj tuab kom tsis txhob ua hauj lwm nyuaj thiab muaj peev xwm tawg.
Lub thermal conductivity ntawm A387 Gr 11 CL 2 yog dab tsi?
Ntawm 20℃(68℃F), thermal conductivity yog hais txog 42 W / (m·K), txo qis me ntsis nrog nce kub, haum rau kev siv cua sov.
Puas yog A387 Gr 11 CL 2 haum rau kev pabcuam hydrogen?
Yog, nws yog dav siv nyob rau hauv hydrogen kev pab cuam (xws li, hydrocracking units) vim nws tsis kam mus rau hydrogen embrittlement ntawm kub kub thiab siab.
A387 Gr 11 CL 2 yog dab tsi?
Feem ntau xa tuaj rau hauv qhov xwm txheej thiab tempered (N&T), optimizing nws cov khoom siv kho tshuab thiab ua kom muaj kev sib haum xeeb thoob plaws lub phaj.
Dab tsi yog qhov coefficient ntawm thermal expansion ntawm A387 Gr 11 CL 2?
Los ntawm 20℃mus rau 500 degree, nws yog kwv yees li 12.5 × 10⁻⁶/degree, tseem ceeb rau thermal stress xam nyob rau hauv siab - cov khoom kub.
A387 Gr 11 CL 2 puas tuaj yeem ua haujlwm tsis muaj tempering?
Tsis yog, tempering tom qab normalizing yog qhov yuav tsum tau txo qis hardness, txo kev ntxhov siab, thiab txhim kho toughness, ua tau raws li ASTM A387 cov cai.
Qhov txawv ntawm A387 Gr 11 thiab Gr 22 yog dab tsi?
Gr 22 muaj ntau dua Mo cov ntsiab lus (2.25%), zoo dua siab -kub creep resistance, thaum Gr 11 yog tus nqi-zoo rau nruab nrab-kub siv.
Dab tsi yuav tsum tau ua raws li cov qauv rau vuam A387 Gr 11 CL 2?
Ua raws li AWS D1.1/D1.1M (Structural Welding Code) thiab ASME BPVC Section IX, xaiv qhov sib txuam Cr-Mo electrodes rau weld joint zog.