SA387 Qib 11 Chav Kawm 2yog chromium-molybdenum alloy steel phaj rau siab-kub siab cov hlab ntsha thiab boilers, muab lub zog zoo thiab corrosion kuj vim nws ~ 1% Chromium (~ Cr) thiab ~ 0.5% Molybdenum (~Mo) cov ntsiab lus, nrog rau 'Class 2' qhia tau hais tias muaj zog tensile zog (75-ksi, 10) thiab roj Kev lag luam tshuaj lom neeg rau kev pabcuam kub siab, muab kev tiv thaiv rau oxidation thiab qaub roj ib puag ncig, thiab tau lees paub rau ob qho tib si ASME thiab ASTM cov qauv.
Sib npaug
| BS | EN | ASTM / ASME Cov | DIN |
| 621 B | ––– | SA387-11-2 | ––– |
Specifications rau ASME SA387 Qib 11 Alloy Steel Phaj
| Lub npe | Nominal Chromium Cov ntsiab lus (%) |
Nominal Molybdenum Cov ntsiab lus (%) |
| SA387 Qib 11 | 1.25% | 0.50% |
Tensile Requirements rau ASME SA387 Qib 11 Alloy Steel Phaj Chav Kawm 2
| Lub npe: | Yuav tsum tau: | Qib 11 |
| SA387 Qib 11 | Tensile zog, ksi [MPa] | 75 txog 100 [515 rau 690] |
| Yield zog, min, ksi [MPa] / (0.2% offset) | 43 [310] | |
| Elongation hauv 8 nti. [200mm], min % | 18 | |
| Elongation hauv 2 nti. [50mm], min, % | 22 | |
| Txo thaj tsam, min% | ––– |
Cov Khoom Siv Tshuaj Rau ASME SA387 Qib 11 Alloy Steel Phaj
| Element | Chemical Composition (%) | |
| SA387 Qib 11 | ||
| 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: | 0.50 - 0.80 |
| Product Analysis: | 0.44 - 0.86 | |
| Chromium: | Kev Ntsuas Kub: | 1.00 - 1.50 |
| Product Analysis: | 0.94 - 1.56 | |
| Molybdenum: | Kev Ntsuas Kub: | 0.45 - 0.65 |
| Product Analysis: | 0.45 - 0.70 |
Cov txheej txheem tseem ceeb
Khoom siv:
Cov qib no muaj kwv yees li 1% chromium thiab 0.5% molybdenum, uas ua kom nws cov qib siab - kub lub zog thiab oxidation tsis kam. Cov ntsiab lus ntawm cov alloy tswj kuj txhim kho kev nkag siab thiab kev ruaj ntseg nyob rau hauv lub sij hawm thermal raug, ua rau nws tsim nyog rau elevated - qhov kub thiab txias kev pab cuam nyob rau hauv cov khoom siv siab thiab kub hloov daim ntaub ntawv.
Kev kho cua sov:
Nws feem ntau yog muab los ntawm Normalized thiab Tempered (N&T) lossis Quenched thiab Tempered (Q&T) qhov xwm txheej, uas txawv ntawm Chav Kawm 1. Cov kev kho cua sov no yog tsim los ua kom zoo dua lub zog thiab tawv, ua kom zoo dua microstructure, thiab xyuas kom meej cov khoom siv sib xws thoob plaws cov tuab, tshwj xeeb tshaj yog rau cov khoom hnyav - phab ntsa.
Mechanical Properties:
Chav Kawm 2 muaj zog tensile thiab tawm los ntau dua piv rau Chav Kawm 1, muab kev thauj khoom ntau dua - nqa lub peev xwm thiab tsis kam mus rau deformation hauv kev ntxhov siab. Txawm hais tias Chav Kawm 1 muaj qhov elongation ntau dua thiab zoo dua ductility, Chav Kawm 2 yog qhov nyiam rau cov kev pabcuam hnyav dua qhov muaj zog thiab kev ncaj ncees ntawm cov qauv yog qhov kev txhawj xeeb tseem ceeb.
Fabrication:
Cov khoom no nthuav tawm zoo heev weldability thaum ua raws li cov txheej txheem, suav nrog preheat thiab interpass kub tswj. Nws yog dav siv nyob rau hauv fabrication ntawm boilers, tshav kub exchangers, thiab siab hlab ntsha, qhov twg txhim khu kev qha kev ua tau zoo nyob rau hauv lub siab thiab kub yog qhov tseem ceeb rau kev nyab xeeb thiab ua haujlwm zoo.
Manufacturing & Testing
Ntau lawm: Ua los ntawm siab - cov ntaub ntawv zoo thiab cov cuab yeej siv siab heev.
Kev Tswj Xyuas Zoo: Tau txais kev xeem nruj, suav nrog:
Tensile, Elongation, Impact tests
Spectrographic (Chemical) tsom xam
Radiography (X-ray) thiab Hydrostatic tests
Hardness thiab Flattening xeem
daim ntawv thov
1. Roj, Roj, thiab Petrochemical Industries
Cov hlau no tau siv dav rau cov khoom siv uas ua rau muaj kev phom sij lossis siab -kub media.
Pressure Vessels & Separators:Siv nyob rau hauv fabrication ntawm cov hlab ntsha loj uas khaws cov kua thiab gases nyob rau hauv siab.
Hydrotreating & Hydrogenation Reactors:Tshwj xeeb yog xaiv rau nws tsis kam mus rau siab -Tub kub Hydrogen Attack (HTHA)thiab hydrogen{0}}induced cracking (HIC).
Fractionation Kem:Nws thermal stability ua rau nws zoo tagnrho rau kev ua haujlwm tsis tu ncua ntawm refining units.
Kev Pab Cuam Roj:Cov ntsiab lus siab chromium (1.00-1.50%) muab qhov tseem ceeb tiv thaiv oxidation thiab corrosion nyob rau hauv ib puag ncig uas muaj hydrogen sulfide (𝐻2𝑆).
2. Kev tsim hluav taws xob
Nws lub zog ntawm qhov kub siab (feem ntau yog 350℃txog 480 degree) yog leveraged hauv thermal thiab nuclear fais fab nroj tsuag.
Boiler Drums & Headers:Qhov tseem ceeb rau cov khoom raug rau lub sijhawm ntev thermal thiab mechanical stress.
Chav Piping Systems:Siv rau siab -kub ducting thiab piping uas nqa chav rau turbines.
Chav Turbines:Siv nyob rau hauv turbine Cheebtsam uas yuav tsum tau siab creep kuj.
3. Cov khoom siv hluav taws xob hloov hluav taws xob
SA387 Qib 11 Chav Kawm 2 yog cov khoom siv zoo tshaj plaws rau cov khoom siv nrog kev sib pauv thermal.
Thaum tshav kub kub Exchangers:Siv nyob rau hauv plhaub- thiab- raj tsim uas yuav tsum tau tiv taus thermal cycling tsis tu ncua tsis deforming.
Rauv Cheebtsam:Ua hauj lwm nyob rau hauv qhov chaw ntawm industrial furnaces uas siab - yuav tsum tau ua kom sov.
4. Tshwj xeeb Fittings thiab Cheebtsam
Dhau ntawm daim hlau loj, qib no tau ua tiav rau hauv cov khoom siv kho mob tseem ceeb:
Flanges thiab Valves:Rau kev ruaj ntseg kev sib txuas hauv siab - cov kav dej siab.
Pipe Clamps thiab Fittings:Txhawm rau txhawb siab -kub piping systems.
Yog xav paub ntxiv txog GNEE cov khoom siv hlau, tiv tauj peb ntawm beam@gneesteelgroup.com. Peb tos ntsoov yuav ua haujlwm nrog koj.
Cov khoom siv dab tsi yog SA387 Qib 11 Chav Kawm 2 nyob rau?
Nws yog ib qho qis- alloy chromium-molybdenum steel, feem ntau yog siv rau kev siv lub nkoj siab. Nws muaj qhov zoo heev - kub lub zog thiab corrosion kuj, haum rau hnyav ua hauj lwm ib puag ncig.
Dab tsi yog cov tshuaj tseem ceeb ntawm SA387 Qib 11 Chav Kawm 2?
Nws cov khoom tseem ceeb suav nrog 0.05-0.17% carbon, 0.40-0.65% manganese, 1.00-1.50% chromium, thiab 0.45-0.65% molybdenum, ua kom nws cov khoom siv kho tshuab.
Qhov tsawg kawg nkaus tensile lub zog ntawm SA387 Qib 11 Chav Kawm 2 yog dab tsi?
Lub zog tensile yam tsawg kawg nkaus yog 415 MPa (60 ksi). Lub zog theem no tso cai rau nws tiv taus siab hauv kev lag luam khoom siv.
Yuav ua li cas kom paub meej qhov zoo ntawm SA387 Qib 11 Chav Kawm 2 thaum tsim khoom?
Ntxuav qhov chaw ua ntej ua, tsis txhob khawb, thiab siv cov txheej txheem vuam kom raug. Tom qab-fabrication sib tsoo tuaj yeem txhim kho qhov smoothness.
Kev kho cua sov txheem rau SA387 Qib 11 Chav Kawm 2 yog dab tsi?
Nws feem ntau undergoes normalizing (890-925 degree) ua raws li tempering (595-705 degree). Cov txheej txheem no txhim kho toughness thiab txo cov kev ntxhov siab sab hauv.
Vim li cas tom qab -weld kev kho cua sov tsim nyog rau SA387 Qib 11 Chav Kawm 2?
Nws relieves weld-induced residual stresses, txhim kho ductility, thiab tiv thaiv intergranular corrosion. Qhov no ua kom lub sijhawm ntev - kev ntseeg tau ntawm cov pob qij txha welded.
Yuav ua li cas yog tias SA387 Qib 11 Chav Kawm 2 dhau lawm -mob?
Tshaj -tempering txo nws cov hardness thiab lub zog, cuam tshuam rau load- bearing peev. Nws kuj tseem tuaj yeem ua rau kev hloov pauv microstructural ua rau kev ua haujlwm tsis zoo.
Cov ntawv thov tseem ceeb ntawm SA387 Qib 11 Chav Kawm 2 yog dab tsi?
Nws yog dav siv nyob rau hauv cov hlab ntsha siab, boilers, thiab tshav kub exchangers nyob rau hauv roj, roj, thiab petrochemical industries, tshwj xeeb tshaj yog rau siab - kub thiab siab - cov kev pab cuam siab.
SA387 Qib 11 Chav Kawm 2 puas tuaj yeem siv rau hauv qhov chaw qis -kub?
Nws tsis yog qhov zoo tagnrho rau qhov kub thiab txias heev. Nws ua tau zoo tshaj plaws ntawm -29℃rau 593 degree, dhau qhov uas nws toughness yuav txo qis.
Puas yog SA387 Qib 11 Chav Kawm 2 haum rau corrosive media?
Nws tiv taus me me mus rau nruab nrab corrosion, tshwj xeeb tshaj yog los ntawm cov organic acids thiab chav. Rau corrosion hnyav heev, yuav tsum tau ntxiv coatings los yog alloys.