ASTM A387 Qib 11 Chav Kawm 1 Hlau
Txheej txheem cej luam:
ASTM A387 Qib 11 Chav Kawm 1 yog chromium-molybdenum (Cr-Mo) alloy steel phaj tshwj xeeb tsim los siv rau hauv cov hlab ntsha siab ua haujlwm ntawm qhov kub siab. Nws ntog nyob rau hauv dav dav ASTM A387 tus qauv, uas npog cov hlab ntsha siab rau kev pabcuam ntawm qhov kub thiab txias. Qib 11 qhia txog cov tshuaj muaj pes tsawg leeg, thaum Chav Kawm 1 txhais nws cov kev kho cua sov.
Cov yam ntxwv tseem ceeb:
Kev sib xyaw:Cov ntsiab lus alloying yog Chromium (1.00-1.50%) thiab Molybdenum (0.45-0.65%). Chromium muab kev txhim kho oxidation (scaling) thiab corrosion kuj, thaum molybdenum txhim khu kev kub-kub lub zog thiab creep kuj.
Kev kho cua sov (Class 1):Cov phaj uas raug xaiv raws li Chav Kawm 1 tau muab rau hauv qhov qub lossis kev ntxhov siab-txoj kev mob. Normalizing muaj cua sov cov hlau saum toj no nws tseem ceeb heev kub thiab huab cua- txias nws, uas refines lub grain qauv thiab txhim kho txhua yam khoom. Kev ntxhov siab txo qis kev ntxhov siab los ntawm cov txheej txheem tsim khoom ua ntej yam tsis muaj kev hloov pauv ntawm microstructure. Cov khoom siv hauv chav kawm 1 feem ntau yog siv qhov chaw tshaj tawm - kev kho cua sov (xws li post-weld heat treatment - PWHT) yuav ua los ntawm tus neeg tsim khoom.
Mechanical Properties:Nws muaj qhov sib npaug ntawm lub zog thiab toughness. Yam tsawg kawg nkaus tensile lub zog yog 415 MPa (60 ksi) nrog rau qhov tsawg kawg nkaus tawm lub zog ntawm 205 MPa (30 ksi). Nws qhov txiaj ntsig tseem ceeb tshaj carbon steel yog tuav lub zog ntawm qhov kub siab tshaj 400℃(750℃F).
Weldability:Nws muaj qhov zoo weldability tab sis yuav tsum tau ua raws li cov txheej txheem kom raug. Preheating (feem ntau yog 150-200℃/ 300-400℃F) thiab yuav tsum tau kho tom qab Weld Heat Treatment (PWHT) yog qhov tseem ceeb. PWHT, ua nyob rau hauv thaj tsam ntawm 595-720℃(1100-1325℃F), yog ib qho tseem ceeb rau temper lub hardened weld thiab tshav kub-cuam tshuam cheeb tsam, restore toughness, thiab txo residual stresses.
Cov ntawv thov tseem ceeb:
Cov khoom no yog ib qho chaw ua haujlwm rau qhov tseem ceeb siab - cov khoom siv kub hauv:
Petroleum Refineries:Catalytic cracking units, hydrocrackers, reactors, thiab siab -kub cais.
Chemical & Petrochemical Nroj Tsuag:Cov nkoj xa mus rau kev pabcuam hydrogen (qhov twg nws tiv thaiv hydrogen nres) thiab siab - cov txheej txheem siab.
Kev tsim hluav taws xob:Cov ntu ntawm cov boilers, chav nruas, thiab cov khoom siv hluav taws xob ua haujlwm ntawm qhov kub thiab txias.
Sib piv nrog Chav Kawm 2:
Nws yog ib qho tseem ceeb kom paub qhov txawv ntawm ASTM A387 Qib 11 Chav Kawm 2. Chav Kawm 2 cov phaj yog nkag rau hauv qhov zoo li qub thiab tempered (quenched thiab tempered kuj tso cai). Qhov no ua rau Chav Kawm 2 cov khoom muaj zog ntau dua thiab muaj kev sib txuam ntau dua, ua kom zoo dua microstructure nyob rau hauv raws li -muab lub xeev. Chav Kawm 1 muaj ntau dua rau kev tsim khoom uas xav tau kev tsim kub ntau thiab tom qab PWHT, thaum Chav Kawm 2 feem ntau raug xaiv rau cov ntawv thov uas xav tau siab dua li - tau txais lub zog lossis qhov chaw tsim khoom puv PWHT tsis ua tau.
Hauv cov ntsiab lus,ASTM A387 Qib 11 Chav Kawm 1 yog qhov qub Cr-Mo alloy steel phaj muab siab heev- kub lub zog thiab oxidation tsis kam. Nws cov tshuaj chemistry tswj thiab normalized ua rau nws ib tug txhim khu kev qha thiab dav cov ntaub ntawv rau fabricating siab hlab ntsha uas yuav tsum tau ua hauj lwm yam xyuam xim nyob rau hauv siab - kub, siab - siab tej yam kev mob nyob rau hauv xav tau kev lag luam.
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.
