A537 Chav Kawm 3hais txog qhov siab -lub zog,quenched thiab tempered (Q & T)carbon-manganese-silicon steel phaj, feem ntau siv rau fusion-weldedcov hlab ntsha, boilers, thiab cia tanksnyob rau hauv nruab nrab- cov ntawv thov siab, muab qhov tsawg kawg nkaus tawm lub zog ntawm 380 MPa (55 ksi) thiab superior zog thiab hardness los ntawm kev kho cua sov. Nws yog ib qib tshwj xeeb raws li ASTM A537 tus qauv, txawv ntawm Chav Kawm 1 (normalized) thiab Chav Kawm 2 (tseem Q&T tab sis qis tempering).
ASTM boiler qib A537 chav kawm 3 siab nkoj steel phaj tshuaj muaj pes tsawg leeg:
| Qib | C | Mn | P | S | Si | Cu | Ni | Cr | Mo |
| A537 chav 3 | 0.24 | 0.92-1.72 | 0.035 | 0.035 | 0.13-0.55 | 0.38 | 0.28 | 0.29 | 0.09 |
Cov yam ntxwv ntawm A537 chav kawm 3 steel phaj ntawm qhov kub thiab txias:
| Qib | Thickness (hli) | Tsawg-yield (Mpa) | Tensile (MPa) | Elongation (%) |
| A537 chav 3 | 8mm-65 hli | Min 380 Mpa | 550-690 Mpa | 22% |
| 66mm-100 hli | Min 345 Mpa | 515-655 Mpa | 22% | |
| 101mm-150mm | Min 275 Mpa | 485-620 Mpa | 20% |
Lwm lub npe lag luam ntawm A537 chav kawm 3 phaj:
A537 daim
A537 hlau
A537 chav kawm 3 steel
ASTM A537 hlau
A537 carbon hlau
A537 steel phaj
ASTM A537 phaj
A537 qib phaj
Cov qib A537 hauv qab no kuj muaj:
ASTM A537 / ASME SA537 chav kawm 1 /A537CL1
ASTM A537 / ASME SA537 chav kawm 2 /A537 CL2
A537 chav kawm 3 steel phaj thickness yog qis dua 150 hli [6 nti]. A537CL3 steel feem ntau yog siv hauv kev lag luam roj, roj thiab petrochemical.
Cov ntawv thov tseem ceeb
Cov Khoom Siv Hluav Taws Xob & Boilers: Nws thawj siv yog nyob rau hauv lub tsev cov khoom uas tuav cov kua los yog gases nyob rau hauv lub siab, yuav tsum tau zoo toughness.
Roj & Roj Kev Lag Luam: Siv nyob rau hauv cov khoom sib cais, lub tank cia, thiab cov khoom siv ua haujlwm.
Kev lag luam tshuaj: Haum rau lub tank thiab reactors khaws cov tshuaj.
Fais fab nroj tsuag: Rau cov khoom siv hluav taws xob thiab lwm yam tseem ceeb.
Cia Tank: Rau ntau yam kua thiab roj (xws li LPG).
Cov yam ntxwv tseem ceeb
Kev kho cua sov: Feem ntau quenched thiab tempered (Q&T) rau lub zog thiab toughness.
Weldability: Zoo weldability, tseem ceeb heev rau kev tsim cov hlab ntsha.
Toughness: Muab kev txhim kho qhov tsis zoo, qhov tseem ceeb rau kev thauj khoom cyclic thiab qis dua.
Corrosion Resistance: Muaj peev xwm teev tau nrog Hydrogen Induced Cracking (HIC) kuaj rau corrosive ib puag ncig.
Vim li cas hoob 3?
Chav Kawm 3 muaj qhov sib npaug ntawm lub zog thiab lub zog, ua rau nws muaj ntau yam kev xaiv rau cov kev xav tau, feem ntau xaiv thaum lub zog siab dua lossis cov khoom tshwj xeeb toughness xav tau piv rau Chav Kawm 1 lossis 2. Nws yog cov cua sov-kho carbon-}manganese-silicon steel tsim rau kev txhim khu kev qha nyob rau hauv siab kub thiab nruab nrab siab cov kev pab cuam, raws li A3 SME SA5 cov qauv.
Tag nrho cov specification thiab cov ntsiab lus muaj nyob rau ntawm kev thov. Cov ntaub ntawv saum toj no yog muab rau kev taw qhia nkaus xwb. Rau kev tsim tshwj xeeb thov hu rau peb cov neeg ua haujlwm muag khoom.
ASTM A537 Chav Kawm 3 ntawm qhov ntsuas kub li cas?
Kev ntsuam xyuas cuam tshuam rau ASTM A537 Chav Kawm 3 yog ua ntawm -46℃. Qhov ntsuas kub qis no ua kom cov khoom muaj zog txaus los tiv thaiv qhov tawg ntawm qhov chaw txias. Cov txiaj ntsig tau pab txheeb xyuas qhov ua tau zoo ntawm qhov normalization thiab tempering kub kho.
Lub hom phiaj ntawm normalizing ASTM A537 Class 3 yog dab tsi?
Normalizing ASTM A537 Class 3 refines cov qauv nplej, txhim kho toughness, thiab txo kev sib cais. Cov hlau yog rhuab mus rau 870-925℃thiab huab cua-cooled, uas ua rau ib tug uniform ferrite-pearlite microstructure. Cov kauj ruam no yog qhov tseem ceeb rau kev ua tiav cov khoom siv kho kom zoo ib yam hla cov phaj tuab.
Vim li cas tempering yuav tsum tau tom qab normalization rau ASTM A537 Class 3?
Tempering tom qab normalization txo hardness, relieves residual stresses, thiab txhim kho toughness. Cov hlau yog rhuab kom tsawg kawg yog 595 degree, uas tso cai rau cov pa roj carbon diffuse thiab tsim cov carbides ruaj khov dua. Qhov no ua rau muaj kev sib npaug ntawm lub zog thiab kev ua haujlwm uas tsim nyog rau kev pabcuam lub nkoj siab.
Dab tsi yog qhov siab tshaj carbon cov ntsiab lus tso cai hauv ASTM A537 Chav Kawm 3?
ASTM A537 Chav Kawm 3 txwv cov pa roj carbon ntau tshaj 0.23 feem pua. Qhov kev txwv no ua kom zoo weldability los ntawm kev tiv thaiv cov tawv tawv ntau dhau hauv tshav kub- thaj chaw cuam tshuam. Cov ntsiab lus qis dua kuj pab txhim kho lub zog thiab txo qhov kev pheej hmoo ntawm hydrogen-induced cracking.
Dab tsi yog manganese ua si hauv ASTM A537 Chav Kawm 3?
Manganese nyob rau hauv ASTM A537 Chav Kawm 3, xws li ntawm 1.00 mus rau 1.60 feem pua, txhim khu lub zog thiab hardenability. Nws kuj txhim kho toughness los ntawm refining lub grain qauv thaum tshav kub kub kho. Cov ntsiab lus manganese kom ntseeg tau tias cov hlau ua tau raws li qhov xav tau tawm los thiab qib tensile zog.
Vim li cas phosphorus thiab sulfur khaws cia qis hauv ASTM A537 Class 3?
Phosphorus thiab sulfur yog txwv kom txo cov embrittlement thiab txhim kho toughness. Phosphorus tuaj yeem ua rau txias luv, thaum leej faj ua rau cov sulfide nkig. Kev tswj cov ntsiab lus no ua kom zoo dua weldability thiab tiv thaiv kev tawg hauv kev siv lub nkoj siab.
Dab tsi yog qhov ntev ntawm ASTM A537 Class 3 daim hlau?
ASTM A537 Class 3 daim hlau yog tsim nyob rau hauv ntau yam thicknesses, feem ntau mus txog 150 hli. Qhov dav thiab qhov ntev yog nyob ntawm kev tsim khoom tab sis feem ntau yog li ntawm 1500 txog 4000 hli thiab 6000 txog 12000 hli, feem. Cov phaj tuab yuav tsum tau kho cua sov tshwj xeeb kom muaj zog.
Yuav ua li cas cov qauv yuav tsum tau hais thaum fabricating nrog ASTM A537 Class 3?
Fabrication ntawm ASTM A537 Chav Kawm 3 feem ntau hais txog ASME Tshooj II rau kev lees txais cov khoom siv thiab ASME Tshooj VIII rau kev tsim cov hlab ntsha siab. Cov txheej txheem vuam ua raws AWS D1.1 lossis ASME Section IX. Cov qauv ntsuas suav nrog ASTM A370 rau kev kuaj tshuab thiab ASTM A609 rau kev kuaj ultrasonic.
Cov khoom siv vuam siv tau zoo li cas rau ASTM A537 Chav Kawm 3?
Cov khoom siv tsim nyog rau ASTM A537 Chav Kawm 3 suav nrog qis -hydrogen electrodes xws li E7018 rau SMAW. Rau GMAW, ER70S-6 feem ntau yog siv, thaum FCAW yuav siv E71T-1. SAW feem ntau ntiav EL8 electrodes nrog cov fluxes sib xws. Cov khoom siv hluav taws xob yuav tsum muab qhov zoo toughness thiab lub zog sib piv.
Dab tsi yog qhov zoo ntawm ASTM A537 Chav Kawm 3 tshaj A516 qib?
ASTM A537 Chav Kawm 3 muaj lub zog ntau dua li qib A516, tso cai rau cov phaj nyias nyias thiab txo qhov hnyav. Nws kuj muab qhov zoo dua qis -kub toughness vim normalization thiab tempering. Cov txiaj ntsig no ua rau nws tsim nyog rau kev xav tau ntau lub nkoj siab thiab kev siv lub tank cia.
Cov kev txwv ntawm ASTM A537 Class 3 yog dab tsi?
ASTM A537 Class 3 tej zaum yuav muaj cov khoom siv ntau dua thiab cov nqi ua haujlwm piv rau qis dua - lub zog carbon steels. Nws kuj yuav tsum tau ceev faj cov txheej txheem vuam thiab tej zaum yuav xav tau PWHT rau cov ntu tuab. Tsis tas li ntawd, nws muaj nyob rau hauv daim hlau tuab heev tuaj yeem raug txwv, yuav tsum tau npaj tshwj xeeb ntau lawm.