Dab tsi yog cov khoom thiab kev siv ntawm A387 Qib 11 Chav Kawm 1 Hlau?
Txheej txheem cej luam
ASTM A387 Qib 11 Chav Kawm 1yog ib qho chromium-molybdenum (Cr-Mo) alloy steel phaj tshwj xeeb tsim los rau welded siab hlab ntsha ua haujlwm ntawm qhov kub siab. Nws muaj pes tsawg leeg thiab tswj kev kho cua sov ua rau nws xaiv zoo tshaj carbon steel rau siab - kub thiab siab - kev pabcuam siab.
Cov khoom tseem ceeb
1.Chemical Composition (Hom):
Chromium (Cr): 1.00 - 1.50% - Ua kom muaj zog tiv thaiv oxidation (scaling) thiab corrosion, tshwj xeeb tshaj yog tiv thaiv sulfur compounds.
Molybdenum (Mo): 0.45 - 0.65% - Txhim kho siab - qhov kub thiab txias tsis kam (tsis kam mus rau maj mam deformation hauv kev ntxhov siab).
2.Mechanical Properties (Raws li -Specified yam tsawg kawg nkaus):
Tensile zog: 415 - 585 MPa (60 - 85 ksi)
Tawm Zog: 205 MPa (30 ksi) min.
Qhov Zoo Tshaj Plaws: Nws khaws ib feem tseem ceeb ntawm nws lub zog ntawm qhov kub siab tshaj 400 ° C (750 ° F), qhov twg carbon steel tsis muaj zog sai.
3. Kev kho cua sov (Qhov "Class 1" Distinction):
Qhov xwm txheej: Muab nyob rau hauv qhov zoo li qub los yog Kev Nyuaj Siab -Txiv kab mob.
Normalizing refines lub grain qauv rau txhim kho uniformity thiab toughness.
Qhov cuam tshuam: Cov khoom siv hauv chav kawm 1 yog npaj rau cov neeg tsim khoom uas yuav ua Post-Weld Heat Treatment (PWHT) tom qab tsim thiab vuam. Qhov no tso cai rau kev txo kev ntxhov siab thiab kho cov khoom hauv qhov kawg fabricated tivthaiv.
4. Weldability & Fabrication:
Nws yog weldable nrog cov txheej txheem tsim nyog, tab sis yuav tsum muaj kev tswj xyuas nruj.
Preheating (150-200 ° C / 300-400 ° F) yog qhov yuav tsum tau ua kom tsis txhob tawg.
Yuav Tsum Tshaj Tawm -Weld Heat Treatment (PWHT) yog qhov tseem ceeb, feem ntau ntawm 595-720 ° C (1100-1325 ° F). Cov kauj ruam no txo cov kev ntxhov siab, ua rau thaj tsam weld, thiab ua kom pom kev tiv thaiv corrosion thiab toughness.
Cov ntawv thov tseem ceeb
Vim nws cov khoom, A387 Gr.11 Cl.1 yog cov khoom siv hauv kev lag luam uas cov khoom siv ua haujlwm hauv qhov kub thiab txias (HT / HP):
Petroleum Refineries:
Catalytic cracking units (reactors, regenerators)
Hydrocracking thiab hydroprocessing reactors
High-kub/siab-siab sib cais thiab cov hlab ntsha
Chemical & Petrochemical Nroj Tsuag:
Lub nkoj rau cov txheej txheem uas muaj hydrogen (nws muaj kev tiv thaiv zoo rau hydrogen nres ntawm qhov kub siab)
Ammonia converters
High -pressure heat exchangers
Kev tsim hluav taws xob:
Cov seem ntawm cov pob txha-roj fais fab nroj tsuag boilers (piv txwv li, chav nruas, headers)
Thaum tshav kub kub rov qab chav generators (HRSGs)
General Pressure Vessel Fabrication:Rau txhua qhov kev pabcuam uas kub siab tshaj qhov txwv tsis pub tshaj rau cov pa roj carbon steel (xws li ASME Boiler thiab Pressure Vessel Code Tshooj I lossis Tshooj VIII, Div. 1 kev pabcuam).
Kev sib piv nrog Chav Kawm 2
Rau cov ntsiab lus, A387 Qib 11 Chav Kawm 2 yog muab rau hauv qhov xwm txheej Normalized thiab Tempered (los yog quenched & Tempered). Chav Kawm 2 muaj ntau dua li - xa lub zog thiab feem ntau siv thaum kawg PWHT los ntawm tus neeg tsim khoom siv tsis tau lossis thaum yuav tsum muaj zog pib dua. Chav Kawm 1 muaj ntau dua rau cov khoom siv uas muaj kev sib txuas tseem ceeb thiab tsim, ua raws li lub nkoj puv PWHT.
Cov ntsiab lus
Hauv cov ntsiab lus, ASTM A387 Qib 11 Chav Kawm 1 yog ib txwm muaj 1.25% Cr-0.5%Mo alloy hlau uas muab qhov sib npaug zoo ntawm lub zog kub kub, oxidation tsis kam, thiab fabricability. Nws lub luag haujlwm tseem ceeb yog nyob rau hauv kev tsim kho cov hlab ntsha tseem ceeb thiab cov reactors nyob rau hauv lub zog thiab tshuaj ua lag luam, qhov twg kev ntseeg siab nyob rau hauv thermal thiab mechanical stress yog qhov tseem ceeb.
A387 qib 11 yog dab tsi?
ASTM A387 specification yog tus qauv Specification rau Pressure Vessel Phaj, Alloy Steel, Chromium-Molybdenum npaj rau siv nyob rau hauv welded boilers thiab siab hlab ntsha tsim rau siab kub kev pab cuam. SSAB tuaj yeem muab A387 Qib 11 rau qhov kev xeem nruj rau Chav Kawm 1 thiab / lossis Chav Kawm 2.
Dab tsi yog qhov muaj pes tsawg leeg ntawm A387 steel?
Muaj pes tsawg leeg: ASTM A387 steel phaj feem ntau muaj chromium (txog 9% lossis ntau dua) thiab molybdenum (txog 2.25% lossis ntau dua), uas txhim kho lawv lub zog thiab corrosion kuj ntawm qhov kub thiab txias.
Qhov txawv ntawm A182 thiab A387 yog dab tsi?
Ob leeg ASTM A182 qib F11 chav kawm 2 thiab ASTM A387 qib 22 steel yog hlau alloys. Lawv muaj 99% siab heev ntawm lawv qhov nruab nrab alloy muaj pes tsawg leeg. Muaj 32 cov khoom siv nrog cov txiaj ntsig rau ob qho khoom siv. Cov khoom muaj txiaj ntsig rau ib qho khoom siv xwb (1, hauv qhov no) tsis qhia.
ASTM A387 Qib 11 sib npaug li cas?
ASTM A387 qib 11 sib npaug steel yog ASME SA387 qib 11. ASTM A387 qib 11 npog A387 qib 11 chav kawm 1 thiab A387 qib 11 chav kawm 2, uas sib npaug rau ASME SA387 qib 18 qib 71 thiab qib 12 raws.
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.
