Dab tsi yog cov khoom thiab kev siv ntawm SA387 Qib 11 Chav Kawm 1?
Raws li lub siab lub nkoj qib steel rau siv nyob rau hauv siab kub kev pab cuam, yog siv nyob rau hauv ib tug ntau yam ntawm industries thiab zoo heev, tshwj xeeb tshaj yog nyob rau hauv cov roj, roj thiab petrochemical kev lag luam, qhov twg cov kua thiab gases feem ntau khaws cia nyob rau hauv siab kub.Qhov siab dua ntawm chromium kuj muab zoo heev corrosion thiab oxidation kuj, uas yog ib tug yuav tsum nyob rau hauv qaub daim ntaub ntawv.
Cov khoom ntawm SA387 Qib 11 Chav Kawm 1
SA387 Qib 11 Chav Kawm 1 yog chromium-molybdenum alloy steel phaj nkag rau hauv cov mob annealed. Nws cov khoom yog txhais los ntawm ob qho tib si nws cov tshuaj muaj pes tsawg leeg thiab qhov kev kho cua sov tshwj xeeb.
1. Tshuaj muaj pes tsawg leeg
Chromium (Cr): 1.00 - 1.50% - Muab oxidation thiab corrosion kuj ntawm qhov kub siab.
Molybdenum (Mo): 0.45 - 0.65% - Txhim kho siab - qhov kub thiab txias tsis kam, thiab txo qhov cuam tshuam rau kev kub ntxhov.
Carbon (C): 0.10 - 0.20%
Lwm cov ntsiab lus: Manganese, Silicon, Phosphorus, thiab Sulfur nyob rau hauv kev txwv.
Cov Lus Cim Tseem Ceeb: Cov muaj pes tsawg leeg zoo ib yam rau Qib 11 Chav Kawm 2. Qhov sib txawv tsuas yog nyob hauv kev kho cua sov xwb.
2. Mechanical Properties (Annealed Condition)
Tensile zog: 415 - 585 MPa (60 - 85 ksi)
Yield zog (min): 205 MPa (30 ksi)
Elongation (min): 22% (hauv 50 hli / 2 nti)
Hardness: Feem ntau Tsawg dua los yog sib npaug rau 163 HBW (Brinell). Lub xeev annealed ua rau cov mos mos, ductile microstructure (ferrite thiab pearlite).
Cov yam ntxwv tseem ceeb: qis zog tab sis muaj zog dua ductility thiab formability piv rau Chav Kawm 2 (N&T).
3. Fabrication Properties
Formability: Zoo heev. Lub xeev annealed, softened ua rau nws yog qhov kev xaiv zoo tshaj plaws rau kev ua haujlwm txias txias (xws li, dov, ntxuav lub taub hau, sib sib zog nqus plhaub) qhov twg Class 2 cov khoom yuav muaj kev pheej hmoo tawg.
Weldability: Zoo, tab sis yuav tsum tau tswj cov txheej txheem nruj:
Yuav tsum Preheating: 150-205℃(300-400℃F) los tiv thaiv hydrogen-induced cracking.
Yuav Tsum Tshaj Tawm -Weld Heat Treatment (PWHT): Yuav tsum tau siv rau txhua qhov kev sib txuas los daws kev ntxhov siab, ua kom sov sov- thaj tsam cuam tshuam (HAZ), thiab rov ua kom corrosion kuj. Lub nkoj kawg PWHT feem ntau yog lub voj voog tempering rau tag nrho cov khoom.
4. Siab -Tsub Ua Haujlwm
Kev Pabcuam Kub: Haum rau kev pabcuam txuas mus ntxiv mus txog ~ 595℃(1100℃F).
Oxidation & Creep Resistance: Lub Cr-Mo muaj pes tsawg leeg muab kev tiv thaiv zoo rau scaling (oxidation) thiab creep deformation nyob rau hauv kev ntxhov siab ntawm qhov kub siab.
Cov ntawv thov tseem ceeb ntawm SA387 Qib 11 Chav Kawm 1
Cov khoom no tau teev tseg thaum cov txheej txheem fabrication xav tau siab tshaj plaws formability ua ntej kev kho cua sov kawg ntawm lub nkoj tiav. Nws daim ntawv thov sib tshooj nrog Chav Kawm 2 tab sis raug xaiv rau kev tsim khoom tshwj xeeb.
Kev siv yam muaj xws li:
Lub Hwj Chim Siab Yuav Tsum Tau Ua Kom Zoo:
Dished thiab Hemispherical Lub Taub Hau uas yuav tsum tau kos duab sib sib zog nqus los yog txias txias heev.
Cylindrical shells nrog nruj radii los yog complex geometry.
Thaum tshav kub kub Exchanger Cheebtsam zoo li channel npog thiab tsim tubesheets.
Kev lag luam:
Petrochemical & Refining: Reactors, separators, thiab txhua kab hauv hydrotreating thiab hydrocracking units, tshwj xeeb tshaj yog cov khoom siv hnyav ua ntej lub nkoj kawg PWHT.
Lub Hwj Chim Muaj Peev Xwm: Qee yam boiler Cheebtsam thiab siab -kub siab cov hlab ntsha.
Chemical Processing: Lub nkoj raug rau cov txheej txheem corrosive ntawm qhov kub siab.
Vim li cas thiaj xaiv Class 1 Over Class 2?
Qhov kev txiav txim siab yog kev lag luam engineering -tawm:
Xaiv Chav Kawm 1 thaum fabricability thiab yooj yim ntawm kev sib sau loj yog qhov kev txhawj xeeb tseem ceeb thaum tsim khoom. Tus tsim qauv paub tias lub zog kawg yuav raug tsim los thaum lub nkoj zaum kawg PWHT.
Xaiv Chav Kawm 2 thaum siab dua li - yuav tsum muaj lub zog txaus rau kev tsim qauv, tso cai rau kev txuag tau qhov hnyav, thiab qhov twg tsuas yog yuav tsum muaj kev tsim qauv.
Hauv cov ntsiab lus:
SA387 Qib 11 Chav Kawm 1 yog qhov nyiam tsim qauv ntawm 1.25Cr-0.5Mo alloy, xaiv tshwj xeeb los pab txhawb kev tsim cov txheej txheem hauv kev tsim kho siab -kub siab hlab ntsha, nrog rau kev nkag siab tias nws cov cuab yeej siv tshuab kawg yuav raug tsim los ntawm kev kho cua sov tom qab kev kho cua sov.
1. Cov cuab yeej cuab tam tseem ceeb ntawm SA387 Qib 11 Chav Kawm 1 thiab Chav Kawm 2 yog dab tsi?
SA387 Qib 11 Chav Kawm 1 tau muab nkag rau hauv qhov mob annealed, muab lub zog qis dua tab sis siab dua ductility thiab zoo formability, thaum Class 2 normalized thiab tempered rau ntau dua yield thiab tensile lub zog, ua Class 1 nyiam rau cov mob khaub thuas sib sau daim ntaub ntawv qhov twg kev nyuaj siab yuav ua raws li fabrication.
2. Dab tsi yog qhov tseem ceeb ntawm qhov kub siab - daim ntawv thov kub rau SA387 Qib 11 Chav Kawm 1 daim hlau?
SA387 Qib 11 Chav Kawm 1 feem ntau yog siv rau hauv kev lag luam petrochemical thiab lub zog tsim hluav taws xob rau cov khoom siv xws li hydrogen hloov pauv, catalytic reactors, thiab siab -kub kub exchangers uas ua haujlwm txog li 595℃(1100℃F), qhov twg nws 1.25% chromium thiab 0.5% cov ntsiab lus molybden zoo.
3. Vim li cas tom qab-weld heat treatment (PWHT) tseem ceeb heev rau SA387 Qib 11 Chav Kawm 1 weldments?
PWHT yog qhov yuav tsum tau ua rau SA387 Qib 11 Chav Kawm 1 tom qab vuam los txo cov kev ntxhov siab seem, tiv thaiv hydrogen-induced cracking, thiab rov ua kom cov microstructure nyob rau hauv tshav kub- thaj tsam cuam tshuam, feem ntau ua ntawm 620–690℃(1150–1275℃grite{9} nyob rau hauv lub sij hawm ntev siab -kev pabcuam kub.
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 cov qauv tsim tshwj xeeb thov hu rau peb cov neeg ua haujlwm muag khoom.
