A537 Chav Kawm 3yog hais txog lub siab -lub zog, quenched thiab tempered (Q&T) carbon-manganese-silicon steel phaj, feem ntau yog siv rau fusion-welded siab hlab ntsha, boilers, thiab cia tank nyob rau hauv nruab nrab- daim ntawv thov siab, muab ib tug tsawg kawg nkaus yield zog zog ntawm 5si . 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).
Tshuaj muaj pes tsawg leeg ntawm ASTM A537 Chav Kawm 3
|
Element |
Kev sib xyaw (%) |
|---|---|
|
Cov pa roj carbon (C) |
0.24 max |
|
Manganese (Mn) |
0.70-1.35 (≤40mm thickness) 1.00-1.60 (>40 hli thickness) |
|
Phosphorus (P) |
0.035 max |
|
Sulfur (S) |
0.035 max |
|
Silicon (Si) |
0.15-0.50 |
|
Copper (Cu) |
0.35 max (yog tias muaj) |
|
Nickel (Ni) |
0.25 max (yog tias muaj) |
|
Chromium (Cr) |
0.25 max (yog tias muaj) |
|
Molybdenum (hli) |
0.08 max (yog tias muaj) |
ASTM A537 Chav Kawm 3 PlatesTensile Requirement
| Thickness | Tensile zog [MPa] | Yield zog [MPa], min: |
| 2-1/2 nti thiab hauv qab [65 hli thiab qis dua] | 80-100[550-690] | 55[380] |
| Tshaj 2-1 / 2 txog 4 nti [Ntau 65 txog 100mm] | 75-95[515-655] | 50[345] |
| Tshaj 4 mus rau 6 hauv [Ntau tshaj 100 mus rau 150 mm] | 70-90[485-620] | 40[275] |
Txoj kev ua
1. Cov txheej txheem tsim khoom tseem ceeb: quenched & Tempered (Q + T)
Raws li ASTM A537 tus qauv, Chav Kawm 3 steel yuav tsum tau txais kev kho cua sov tshwj xeeb kom ua tiav nws lub zog siab thiab qis -kub toughness:
quenching: Cov phaj yog rhuab mus rau qhov kub austenitizing (feem ntau yog 1500℃F - 1650℃F / 815℃- 900℃) thiab tom qab ntawd maj mam txias hauv dej lossis roj.
Tempering: Tom qab quenching, cov hlau yog reheated rau qhov kub ntawm tsawg kawg yog 1150℃F (620 degree) rau qhov tsawg kawg nkaus ntawm 0.5 teev ib nti ntawm thickness, ua raws li cua txias. Cov kauj ruam no restores ductility thiab relieves kev ntxhov siab nyob rau hauv.
2. Cov txheej txheem Fabrication
Thaum tsim cov hlab ntsha siab lossis tso tsheb hlau luam, A537 Chav Kawm 3 tau ua raws li cov txheej txheem hauv qab no:
Txiav: Cov txheej txheem feem ntau suav nrog Oxy- hluav taws xob txiav, txiav Plasma, lossis Laser txiav. Vim cov khoom siv hardness, kev tswj xyuas kom sov yog qhov tsim nyog kom tsis txhob muaj ntug tawg.
Kev tsim:
Cold forming: Feem ntau siv rau dov plhaub los yog nias lub taub hau.
Kub forming: Yog hais tias cov khoom yog rhuab saum toj no tempering kub thaum lub sij hawm tsim, nws yuav tsum tau re-quenched thiab tempered kom tswj nws Class 3 mechanical zog.
Vuam: Nws yog tsim rau Fusion Vuam. Vim tias nws yog Q + T steel, kev tswj nruj ntawm Preheat Temperatures thiab Interpass Temperatures yuav tsum tau tiv thaiv hydrogen cracking thiab softening ntawm tshav kub cuam tshuam cheeb tsam (HAZ).
Tom qab- Kev Kho Hniav Kub Kub (PWHT): Feem ntau yuav tsum tau tom qab vuam los txo cov kev ntxhov siab uas seem, txawm tias qhov kub ntawm PWHT yuav tsum nyob qis dua qhov qub tempering kub kom tsis txhob degrading cov hlau lub zog.
3. Cov ntsiab lus tseem ceeb rau kev ua haujlwm
Tawm Zog: Tsawg kawg 55 ksi (380 MPa).
Tensile zog: 75-95 ksi (515-655 MPa).
Max Thickness: Feem ntau muaj txog li 6 nti (150 mm).
Cov ntaub ntawv ntxaws ntxaws thiab cov khoom siv tuaj yeem nrhiav tau los ntawm ASTM International official site lossis cov chaw lag luam xws li Penn Stainless.
daim ntawv thov
1. Lub Nkoj Siab & Boilers
Cheebtsam: Plhaub, taub hau, thiab kub exchangers rau industrial boilers.
Yog vim li cas: High yield zog tso cai rau nyias, sib zog hlab phab ntsa tsis muaj kev ruaj ntseg.
2. Roj, Roj & Petrochemical
Cia: Loj- lub tank loj, spheres, thiab cais cov roj thiab tshuaj.
Kev Pabcuam: Zoo tagnrho rau offshore platforms thiab refineries ua haujlwm nyob rau hauv cov huab cua txias vim nws superior notch toughness.
3. Zog & Infrastructure
Fais fab nroj tsuag: Chav -pressurized Cheebtsam nyob rau hauv thermal thiab nuclear fais fab nroj tsuag.
Tsheb thauj mus los: Pressurized railroad tank tsheb thauj khoom txaus ntshai.
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.
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 sulphide inclusions. 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.
Dab tsi yog qhov yuav tsum tau ua kom zoo rau ASTM A537 Class 3?
ASTM A537 Class 3 daim hlau yuav tsum muaj qhov huv si tsis muaj kab nrib pleb, laminations, thiab porosity ntau dhau. Cov kev tsis zoo me me tuaj yeem raug tshem tawm los ntawm kev sib tsoo, muab cov kev txwv tuab yog khaws cia. Cov neeg tsim khoom yuav tsum ua qhov kev kuaj pom thiab kuaj ultrasonic kom paub meej qhov chaw thiab sab hauv zoo.
Dab tsi yog qhov yuav tsum tau kuaj ultrasonic rau ASTM A537 Chav Kawm 3?
ASTM A537 Class 3 daim hlau feem ntau raug kuaj xyuas ultrasonic ib ASTM A609 lossis cov qauv zoo sib xws. Qhov kev ntsuam xyuas no kuaj pom cov teeb meem sab hauv xws li laminations, voids, thiab inclusions. Qhov kev ntsuam xyuas yog nyob ntawm cov phaj thickness thiab daim ntawv thov, kom ntseeg tau cov qauv kev ncaj ncees hauv cov hlab ntsha siab.
Dab tsi yog qhov siab tshaj plaws hardness pub rau ASTM A537 Chav Kawm 3?
ASTM A537 Chav Kawm 3 feem ntau muaj qhov siab tshaj plaws ntawm 235 HB. Qhov kev txwv no ua kom zoo weldability thiab toughness. Kev ntsuam xyuas hardness yog ua tom qab kev kho cua sov kom paub tseeb tias cov khoom tsis dhau -tempered los yog qis dua -tempered, tuav lub zog tshuav nyiaj li cas.
Yuav ua li cas preheating yog pom zoo thaum vuam ASTM A537 Class 3?
Preheating kub rau ASTM A537 Chav Kawm 3 nyob ntawm thickness thiab vuam txheej txheem tab sis feem ntau yog li ntawm 100 mus rau 200 degree. Preheating txo qhov kev pheej hmoo ntawm hydrogen-induced cracking los ntawm qeeb cov cua txias nyob rau hauv lub tshav kub- thaj tsam cuam tshuam. Thicker daim hlau yuav tsum tau preheat ntau dua los xyuas kom meej fusion thiab toughness.
Puas yog post-weld heat treatment (PWHT) rau ASTM A537 Class 3?
PWHT feem ntau pom zoo rau ASTM A537 Chav Kawm 3, tshwj xeeb tshaj yog rau cov ntu tuab lossis cov pob qij txha nruj heev. Nws txo cov kev ntxhov siab seem, txhim kho toughness, thiab stabilizes microstructure. Hom PWHT kub ntau li ntawm 550 txog 620 degree, nyob ntawm tus qauv tsim thiab kev cai.
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 Chav Kawm 3 yuav muaj cov khoom siv ntau dua thiab cov nqi ua haujlwm piv rau qis dua -lub zogcarbon hlau. 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.
Dab tsi yog kev lag luam feem ntau siv ASTM A537 Class 3?
ASTM A537 Class 3 yog dav siv hauv cov roj, roj, thiab petrochemical kev lag luam rau cov hlab ntsha siab thiab cov tso tsheb hlau luam. Nws kuj tseem pom muaj nyob rau hauv cov chaw tsim hluav taws xob, cov chaw tsim hluav taws xob, thiab cov chaw ua haujlwm sab nrauv uas muaj lub zog siab thiab qis - qhov kub thiab txias yuav tsum muaj. Nws weldability ua rau nws haum rau loj fabricated lug.