ASTM A387 Qib 22 Chav Kawm 2yog chromium-molybdenum alloy steel phaj siv rau siab- kub, siab- cov ntawv siv siab xws li cov welded boilers thiab cov hlab ntsha siab hauv cov roj, roj, thiab tshuaj lom neeg kev lag luam, paub txog nws zoo heev corrosion / oxidation kuj thiab lub zog, muab nyob rau hauv normalized thiab tempered mob nrog siab tensile zog yuav tsum tau ntau tshaj li 1% Crrom 2 ntsiab lus. ~ 1.00% Molybdenum (Mo), nrog rau cov khoom siv tshwj xeeb xws li 75-100 ksi tensile zog thiab 45 ksi yield zog.
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A387 Gr.22 CL.2Tshuaj muaj pes tsawg leeg |
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Qib |
Cov ntsiab lus Max (%) |
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C |
Si |
Mn |
P |
S |
Cr |
Mo |
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A387 Gr.22 Cl.2 |
0.04-0.15 |
0.50 |
0.30-0.60 |
0.035 |
0.035 |
1.88-2.62 |
0.85-1.15 |
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Qib |
A387 Gr.22 CL.2Mechanical Property |
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Thickness |
Yield |
Tensile |
Elongation |
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A387 Gr.22 Cl.2 |
mm |
Min Mpa |
Mpa |
Tsawg% |
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t Tsawg dua lossis sib npaug li 50 |
310 |
515-690 |
18 |
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50<> |
- |
- |
- |
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Txheej txheem ntau lawm
1. Steelmaking & Refining
Melting: Feem ntau ua los ntawm Electric Arc Rauv (EAF).
Refining: Siv Ladle Rauv (LF) thiab Nqus Degassing (VD / VOD) kom txo qis impurities (P, S, Sn, Sb, As) thiab txo cov ntsiab lus hydrogen. Qhov no yog qhov tseem ceeb los tiv thaiv "temper embrittlement" thiab hydrogen-induced cracking.
Casting: Cov hlau yog cam khwb cia rau hauv ingots los yog nruam slabs.
2. Kub Rolling
Cua sov: Slabs yog reheated rau qhov kub thiab txias (feem ntau yog 1150℃-1250 degree).
Rolling: Cov hlau yog dov mus rau qhov xav tau tuab. Precision tswj systems saib xyuas qhov kev txo qis kom ntseeg tau tias muaj cov qauv sab hauv.
3. Kev kho cua sov (The Defining Stage)
Rau Chav Kawm 2, kev kho cua sov yog qhov yuav tsum tau ua kom tiav cov khoom siv kho tshuab:
Normalizing: Cua sov mus rau thaj tsam ntawm 900℃- 980℃(1650℃F - 1800℃F) ua raws li cua txias kom ua kom cov nplej loj.
Tempering: Kub kom tsawg kawg yog 675℃(1250℃F). Rau cov ntawv thov siab heev (xws li kev pabcuam hydrogen), tempering feem ntau ua tiav ntawm 700℃-760℃los txhim kho toughness thiab qis hardness.
Lwm txoj kev: Kev ua kom txias txias (Quenching) ua raws li Tempering kuj tau tso cai yog tias pom zoo ntawm cov chaw tsim khoom thiab cov neeg yuav khoom.
4. Kev kuaj thiab tshuaj xyuas
Mechanical Testing: Kev txheeb xyuas ntawm Tensile Strength (75–100 ksi / 515–690 MPa) thiab Yield Strength (Ntau dua lossis sib npaug ntawm 45 ksi / 310 MPa).
Kev Ntsuam Xyuas Kev Nyuaj Siab: Charpy V-kev ntsuas ntsuas tau ua tiav (feem ntau ntawm -18℃lossis -30 degree) kom ntseeg tau tias qhov kub thiab txias.
Tsis yog-Kev Ntsuam Xyuas Kev Puas Tsuaj (NDT): Kev Ntsuas Ultrasonic (UT) rau ASTM A578 yog tus qauv txhawm rau txheeb xyuas cov laminations sab hauv lossis qhov tsis xws luag.
5. Fabrication Requirements (Post-Mill)
Thaum cov neeg tsim khoom siv cov phiaj no los tsim cov hlab ntsha siab:
Preheating: Vuam yuav tsum tau preheating (feem ntau yog 150℃- 250 degree) los tiv thaiv qhov txias txias.
PWHT (Post-Kev kho cua sov): Yuav tsum muaj kev ntxhov siab-relieving ntawm kwv yees li 680℃- 720℃kom ntseeg tau tias thaj tsam weld ua tau zoo ib yam li cov hlau hauv paus.
daim ntawv thov
1. Roj, Roj, thiab Petrochemical kev lag luam
Lub nkoj siab: tshwj xeeb yog siv rau cov reactors (xws li hydrocrackers thiab hydrogenation units).
Thaum tshav kub kub Exchangers: Cheebtsam uas hloov tshav kub ntawm cov kua hauv refineries.
Cia Tank: Muaj kev nyab xeeb rau cov kua kub thiab cov tshuaj muaj zog.
Piping Systems: Siab - cov kav dej siab rau kev thauj cov pa thiab hydrocarbons.
2. Kev tsim hluav taws xob
Muaj Boilers: Siv rau boiler nruas plhaub thiab superheaters uas tswj huab cua siab.
Chav Cheebtsam: Chav headers, turbine casings, thiab siab -kub ducting.
3. Kev ua tshuaj lom neeg
Chemical Reactors: Cov cuab yeej tsim los tiv thaiv kev kub ntxhov txuas ntxiv thiab kev tawm tsam tshuaj lom neeg.
Cov Hluav Taws Xob Hluav Taws Xob: Cov khoom siv hluav taws xob xav tau siab -kub txhua yam ruaj khov.
4. Cov Txheej Txheem Tshwj Xeeb
Fittings thiab Hardware: Fabrication ntawm flanges, li qub, yeeb nkab clamps, thiab adapters.
Kev Pabcuam Ib puag ncig hnyav: Offshore thiab onshore platforms, condensers, thiab khoom siv rau underwater lossis marine kev pabcuam.
Tau txais cov lus muaj nuj nqis rau ASTM A387 Qib 22 Chav Kawm 2, Hu rau GNEE Steel.
Dab tsi yog qhov tsawg kawg nkaus tensile lub zog ntawm A387 Qib 22 Chav Kawm 2 raws li cov qauv ASTM?
Raws li ASTM A387, nws lub zog tensile yam tsawg kawg nkaus yog 415 MPa (60,000 psi), thiab qhov tsawg kawg nkaus lub zog tawm mus txog 205 MPa (30,000 psi), ua tau raws li cov txheej txheem rau kev siv lub nkoj siab.
Dab tsi yog qhov txiaj ntsig tseem ceeb ntawm A387 Qib 22 Chav Kawm 2 tshaj cov hlau hauv siab - qhov kub thiab txias?
Piv nrog cov pa roj carbon steel, nws muaj kev nkag tau zoo dua thiab oxidation tsis kam ntawm qhov kub siab, tsis txhob deformation thiab degradation ntev - kev pab cuam lub sij hawm, yog li ua kom ruaj khov kev ua tau zoo nyob rau hauv siab - qhov kub thiab txias scenarios.
Dab tsi ntawm cov khoom feem ntau yog tsim los ntawm A387 Qib 22 Chav Kawm 2?
Cov khoom sib xyaw ua los ntawm nws muaj xws li cov hlab ntsha siab, lub taub hau, flanges, cov khoom siv hluav taws xob sib txuas thiab cov kav dej, txhua yam tsim los rau siab - kub thiab siab - kev ua haujlwm siab.
Puas yog A387 Qib 22 Chav Kawm 2 xav tau kev tiv thaiv corrosion hauv ib puag ncig tshwj xeeb?
Nws tiv taus oxidation thiab corrosion me me nyob rau hauv siab - kub gases, tab sis nyob rau hauv aggressive media xws li acidic los yog chloride - nplua nuj ib puag ncig, yuav tsum tau muaj kev tiv thaiv ntxiv xws li cladding los yog txheej.
Tus qauv twg tswj hwm qhov tshwj xeeb ntawm A387 Qib 22 Chav Kawm 2?
Nws cov lus qhia tshwj xeeb yog tswj hwm los ntawm ASTM A387, tus qauv tshwj xeeb tsim rau chromium-molybdenum alloy steel phaj siv hauv cov hlab ntsha siab thiab boilers, ua kom cov khoom zoo thiab siv tau.
Dab tsi yog qhov pom zoo ua ntej kub rau vuam A387 Qib 22 Chav Kawm 2?
Qhov pom zoo ua ntej kub kub yog li ntawm 150℃mus rau 200℃(302℃F txog 392℃F), uas txawv raws li cov khoom thickness thiab cov txheej txheem vuam tshwj xeeb tau txais los xyuas kom zoo vuam zoo.
Cov ncej dab tsi -weld kev kho cua sov (PWHT) yuav tsum muaj rau A387 Qib 22 Chav Kawm 2?
PWHT feem ntau yog ua los ntawm 620℃txog 675℃(1150℃F txog 1247℃F). Lub sij hawm tuav nyob ntawm cov khoom thickness, aiming los txo cov residual stresses thiab txhim khu lub toughness ntawm welded pob qij txha.
A387 Qib 22 Chav Kawm 2 puas tuaj yeem ua tau zoo thiab ua kom sov?
Yog, normalization thiab tempering yog ib qho rau nws. Normalization muaj cua sov mus rau 890-925℃ces cua txias, thiab tempering raws li PWHT tsis mus optimize nws mechanical zog comprehensively.
Qhov kev pabcuam kub li cas ntawm A387 Qib 22 Chav Kawm 2 piv rau 316L stainless hlau?
Qib 22 Chav Kawm 2 muaj qhov kub siab tshaj qhov kev pabcuam (593℃vs 450℃ntawm 316L). Tab sis 316L outperforms nws nyob rau hauv corrosion kuj tiv thaiv aggressive media xws li chlorides.
Dab tsi yog qhov txawv ntawm cov khoom siv ntawm A387 Qib 22 Chav Kawm 2 thiab carbon steel (A516 Qib 70)?
Qib 22 Chav Kawm 2 raug nqi ntau dua A516 Qib 70 vim yog chromium thiab molybdenum. Tus nqi hwm yog tsim nyog rau nws qhov siab tshaj -kub kev ua haujlwm hauv cov ntawv thov tseem ceeb.
Yuav ua li cas cuam tshuam toughness ntawm A387 Qib 22 Chav Kawm 2 piv rau A387 Qib 5 Chav Kawm 2 ntawm qhov kub qis (-20 degree)?
Lawv qhov qis- qhov kub thiab txias cuam tshuam toughness zoo ib yam, tab sis Qib 22 Chav Kawm 2 zoo dua me ntsis vim yog cua sov- kho kom zoo dua microstructure. Tsis yog qhov tsim nyog rau kev pabcuam hauv qab -29 degree.