SA 387 Qib 12 Chav Kawm 2yog chromium-molybdenum alloy steel phaj raws li ASME SA 387 tus qauv, npaj rau kev nce siab -kub siab lub nkoj thiab boiler kev pab cuam. Nws muab qhov zoo siab - kub lub zog, nkag siab, thiab oxidation tsis kam, thiab feem ntau yog siv nyob rau hauv refineries, petrochemical nroj tsuag, thiab cov chaw tsim hluav taws xob. Chav Kawm 2 sawv cev rau kev kho cua sov zoo li qub thiab kho kom zoo dua qub thiab ductility.
Sib npaug
| BS | EN | ASTM / ASME Cov | DIN |
| 620 B | 13 ZPO 45 | SA387-12-2 | 13 ZPO 44 |
Tensile Requirements rau ASME SA387 Qib 12 Alloy Steel Phaj Chav Kawm 2
| Lub npe: | Yuav tsum tau: | Qib 12 |
| SA387 Qib 12 | Tensile zog, ksi [MPA] | 65 txog 85 [450 rau 585] |
| Yield zog, min, ksi [MPa] / (0.2% offset) | 40 [275] | |
| Elongation hauv 8 nti. [200mm], min % | 19 | |
| Elongation hauv 2 nti. [50mm], min, % | 22 | |
| Txo thaj tsam, min% | ––– |
Cov Khoom Siv Tshuaj Rau ASME SA387 Qib 12 Alloy Steel Phaj
| Element | Chemical Composition (%) | |
| ASME SA387 Qib 12 | ||
| Cov pa roj carbon: | Kev Ntsuas Kub: | 0.05 - 0.17 |
| Product Analysis: | 0.04 - 0.17 | |
| Manganese: | Kev Ntsuas Kub: | 0.40 - 0.65 |
| Product Analysis: | 0.35 - 0.73 | |
| Phosphorus: | Kev Ntsuas Kub: | 0.035 |
| Product Analysis: | 0.035 | |
| Sulfur (max): | Kev Ntsuas Kub: | 0.035 |
| Product Analysis: | 0.035 | |
| Silicon: | Kev Ntsuas Kub: | 0.15 - 0.40 |
| Product Analysis: | 0.13 - 0.45 | |
| Chromium: | Kev Ntsuas Kub: | 0.80 - 1.15 |
| Product Analysis: | 0.74 - 1.21 | |
| Molybdenum: | Kev Ntsuas Kub: | 0.45 - 0.60 |
| Product Analysis: | 0.40 - 0.65 |
daim ntawv thov
• Cov hlab ntsha siab thiab cov boilers: Nws yog feem ntau siv rau hauv kev tsim cov hlab ntsha siab, lub taub hau, thiab lwm yam khoom siv uas ua haujlwm ntawm qhov kub siab. Nws cov chromium-molybdenum muaj pes tsawg leeg muab kev nkag siab zoo heev thiab siab - qhov kub thiab txias, ua rau nws haum rau ob qho tib si hluav taws kub- raj thiab dej- raj boilers.
• Refinery thiab petrochemical cov cuab yeej: Cov khoom siv dav siv nyob rau hauv refineries rau reactors, heat exchangers, thiab fractionation txhua. Cov Cheebtsam no feem ntau muaj qhov kub thiab txias ib puag ncig, thiab SA387 Qib 12 Chav Kawm 2 kev sib xyaw ua ke ntawm lub zog thiab lub zog ua kom ntseeg tau ntev -lub sijhawm.
• Lub tshuab hluav taws xob tsim hluav taws xob: Nws yog siv rau hauv cov chaw tsim hluav taws xob rau boiler raj, headers, thiab cov kav dej hauv cov kav dej. Cov hlau muaj peev xwm tiv taus siab tsis tu ncua - qhov kub thiab txias kev pabcuam ua rau nws zoo tagnrho rau ob qho tib si fossil roj thiab qee hom khib nyiab-rau- cov nroj tsuag hluav taws xob.
• Kev lag luam tshuaj lom neeg: SA387 Qib 12 Chav Kawm 2 phaj yog siv rau hauv kev tsim cov txheej txheem ntawm cov hlab ntsha thiab cov khoom siv hluav taws xob sib hloov hauv cov nroj tsuag tshuaj, qhov chaw tiv thaiv thermal thiab oxidation yog qhov tseem ceeb.
• Cov khoom siv roj thiab roj hauv kev lag luam: Nws pom daim ntawv thov nyob rau hauv cov dej ntws ntws thiab nqes dej thiab cov chaw siv roj, suav nrog cov hlab ntsha siab, cov khoom sib cais, thiab siab - cov kav dej kub.
Zuag qhia tag nrho, SA387 Qib 12 Chav Kawm 2 phaj yog cov khoom siv ntau yam xaiv rau nws cov khoom zoo siab - kub, tawv, thiab tsim nyog rau qhov tseem ceeb heev- muaj cov ntawv thov thoob plaws ntau qhov kev lag luam.
ua
1. Steelmaking & Casting
Melting: Feem ntau ua los ntawm Electric Arc Rauv (EAF) lossis Basic Oxygen Rauv (BOF).
Refining: Cov hlau yuav tsum raug tua (deoxidized) kom ntseeg tau tias cov qauv tshuaj tsis sib xws. Lub tshuab nqus tsev degassing feem ntau yog siv los txo cov impurities xws li hydrogen thiab oxygen.
Rolling: Cov phaj feem ntau yog Kub-Rolled (HR) kom ua tiav cov thickness thiab qhov ntev.
2. Kev kho cua sov (tseem ceeb rau chav kawm 2)
Yuav kom ua tiav lub zog siab dua uas xav tau rau Chav Kawm 2, cov phiaj yuav tsum tau txais kev kho cua sov tshwj xeeb:
Annealing los yog Normalizing: Cua sov rau lub austenitizing kub los ua kom cov qauv nplej.
Tempering: Reheating rau qhov tsawg kawg nkaus ntawm 1150℃F (620 degree) los txhim kho toughness thiab ductility thaum tuav lub zog tensile siab (450-585 MPa).
Yeem Kev Ua Txias Txias: Hauv qee kis, kua quenching lossis cua blasting yog siv ua ntej tempering los txhim kho cov khoom siv kho tshuab.
3. Fabrication & Vuam
Txiav: Cov txheej txheem suav nrog Plasma, nplaim taws, lossis dej- dav hlau txiav. Preheating tej zaum yuav tsim nyog rau nplaim taws/plasma txiav los tiv thaiv ntug cracking.
Preheating (Vuam): Qhov kub thiab txias ntawm 150℃txog 200℃feem ntau yuav tsum tau kom tsis txhob muaj qhov txias txias.
Consumables: Cov khoom siv tau zoo xws li E8018-B2 (rau SMAW) lossis ER80S-B2 (rau GMAW) yog siv los ua kom haum rau 1% Cr - 0.5% Mo muaj pes tsawg leeg.
Ncej -Kev kho cua sov (PWHT): Yuav tsum tau ua kom muaj kev ntxhov siab, feem ntau ua ntawm 650℃thiab 700℃.
4. Kev Ntsuas & Kev Tswj Xyuas Zoo
Mechanical Testing: suav nrog tensile, elongation, thiab yield zog pov thawj.
Tsis yog-Kev Ntsuas Kev Ua Phem (NDT): Cov txheej txheem txheej txheem suav nrog 100% Radiography (RT) lossis Ultrasonic Testing (UT) kom ntseeg tau tias muaj kev ncaj ncees sab hauv.
Kev Ntsuam Xyuas Kev Nyuaj Siab: Charpy V-Kev ntsuas ntsuas ntsuas tau ua los ntsuas qis- qhov kub thiab txias, qee zaum qis rau -52℃.
Tau txais cov lus muaj nuj nqis rau SA 387 Qib 12 Chav Kawm 2, Hu rau GNEE Steel.
Dab tsi yog qhov modulus ntawm elasticity ntawm qib no?
Nws cov qauv ntawm elasticity yog li ntawm 200 GPa (29 × 10⁶ psi) ntawm chav tsev kub, zoo ib yam nrog rau qis tshaj - alloy steels rau cov qauv tsim.
Dab tsi tsis yog -kev kuaj kev puas tsuaj (NDT) txoj kev siv rau cov khoom no?
Cov txheej txheem NDT feem ntau suav nrog kev kuaj ultrasonic (UT), kuaj hluav taws xob (RT), thiab kuaj cov hlau nplaum sib nqus (MT) txhawm rau txheeb xyuas cov teeb meem sab hauv thiab saum npoo.
Cov khoom no puas tiv taus hydrogen nres?
Yog lawm, nws muaj kev tiv thaiv zoo rau hydrogen nres thaum tshav kub zoo- kho. Nws yog tsim rau ib puag ncig nrog hydrogen ntawm qhov kub thiab txias siab.
Dab tsi yog qhov siab tshaj plaws thickness muaj rau SA 387 Qib 12 Chav Kawm 2 daim hlau?
Cov phaj muaj txog li 200 hli (7.87 nti) tuab. Cov phaj tuab yuav xav tau kev kho cua sov tshwj xeeb kom ntseeg tau tias cov khoom siv kho tshuab tsis sib xws.
Dab tsi yog qhov thermal conductivity ntawm cov khoom no ntawm chav tsev kub?
Nyob rau hauv chav tsev kub, nws thermal conductivity yog hais txog 42 W / (m·K). Cov cuab yeej no yog ib qho tseem ceeb rau kev xam cov cua sov hloov hauv cov khoom siv hluav taws xob hloov hluav taws xob.
Puas yog SA 387 Qib 12 Chav Kawm 2 puas muaj kev nkag siab zoo?
Yog, nws muaj kev tiv thaiv zoo heev. Cov chromium-molybdenum alloying tiv thaiv kev deformation mus tas li nyob rau hauv ntev - lub sij hawm siab - kub thiab siab loads.
Cov khoom no puas tuaj yeem siv rau hauv cov roj thiab roj refineries?
kiag li. Nws yog dav siv nyob rau hauv cov roj thiab roj refineries rau reactors, boilers, thiab tshav kub exchangers, enduring siab kub thiab corrosive xov xwm.
SA 387 Qib 12 Chav Kawm 2 puas tuaj yeem tsim los ntawm kev khoov?
Yog, nws tuaj yeem khoov nrog cov txheej txheem kom raug. Preheating tej zaum yuav xav tau rau cov seem tuab kom tsis txhob tawg, thiab khoov vojvoog yuav tsum tau tswj.