Dab tsi yog cov khoom thiab kev siv ntawm SA387 Qib 22 Chav Kawm 1?
SA387 Qib 12 Chav Kawm 1 Chromium-Molybdenum (Cr-Mo) alloy steel phaj, standardized los ntawm ASME / ASTM, tsim rau weldable siab hlab ntsha thiab boilers ua hauj lwm nyob rau hauv siab kub, muab zoo zog, toughness, thiab txhim kho corrosion vim nws cov ntsiab lus chromium, haum rau pe demanding roj thiab roj, tiam sis,
SA387 Qib 22 Chav Kawm 1 qhia tib yam tshuaj muaj pes tsawg leeg raws li ntau hom Chav Kawm 2, tab sis nws cov kev kho cua sov sib txawv ua rau cov khoom sib txawv thiab cov ntawv thov raug.
Cov khoom ntawm SA387 Qib 22 Chav Kawm 1
Lub ntsiab txhais feature yog nws cov kev kho cua sov:
Chav Kawm 1: Cov khoom yog muab rau hauv qhov kev mob Annealed.
Muaj pes tsawg leeg: Nominal 2.25% Chromium, 1% Molybdenum (zoo tib yam rau Chav Kawm 2).
Cov Khoom Tseem Ceeb Mechanical (Ib yam rau Annealed Condition):
Lub zog qis dua, siab dua Ductility: Muab piv rau Chav Kawm 2 (Normalized & Tempered), Chav Kawm 1 muaj cov khoom qis dua thiab lub zog tensile tab sis siab dua elongation thiab toughness nyob rau hauv raws li -muab lub xeev.
Softer: Nws muaj qis hardness, ua rau nws yooj yim rau machining thiab txias sib sau.
Microstructure: Cov txheej txheem annealing ua rau cov mos mos, zoo li microstructure (feem ntau ferrite nrog ntxhib carbides) uas ruaj khov thiab kev ntxhov siab -relieved.
Chav tsev ib yam -Tsuas Yam Khoom Cuab Yeej (Rau Kev Siv - Tus nqi tiag tiag yog zeb- tshwj xeeb):
Tensile zog: ~ 415-585 MPa (60-85 ksi)
Lub zog tawm tswv yim: ~ 205 MPa (30 ksi) yam tsawg kawg nkaus (tsawg dua li Chav Kawm 2's 310 MPa min)
Elongation: Higher than Class 2, often >22-25%
Hardness: Feem ntau Tsawg dua los yog sib npaug rau 170 HBW
Cov ntawv thov tseem ceeb ntawm SA387 Qib 22 Chav Kawm 1
Chav Kawm 1 tshwj xeeb yog xaiv rau cov khoom uas xav tau kev tsim khoom tseem ceeb ua ntej lawv qhov kev kho cua sov zaum kawg. Nws cov ntawv thov yog ntau niche dua li Chav Kawm 2:
1.Heavy Cold Forming lossis Severe Fabrication:Siv rau qhov chaw uas yuav tsum tau txias txias dabtsi yog khoov, spinning, los yog nias tom qab lub phaj nkag. Cov mos mos, annealed lub xeev tiv thaiv kev tawg thaum lub sij hawm cov txheej txheem no.
2.Complex Fabricated Cheebtsam:Rau cov hlab ntsha lossis qhov chaw uas qhov vuam dav dav thiab kev tsim yuav ua tiav, thiab tag nrho cov khoom tiav tiav yuav raug xa mus rau qhov kawg Post-Weld Heat Treatment (PWHT). PWHT thaum kawg yuav tsim cov khoom siv kho tshuab kawg hauv cov khoom siv (txog cov chav kawm 2).
3.Interim Condition rau Kev Ua Haujlwm Ntxiv:Qee lub sij hawm teev raws li qhov pib mob rau qhov chaw uas yuav rov ua dua - cua sov- kho los ntawm tus neeg tsim khoom mus rau qhov sib txawv lossis cov xwm txheej tom qab machining / forming.
1.Applications Qhov Qhov Kawg Kawg Properties yog tsim nyob rau hauv kev pab:Hauv qee qhov siab - cov khoom siv kub, cov kev pabcuam lawv tus kheej ua raws li lub voj voog tempering tom qab cov khoom siv annealed tau muab tso rau hauv kev ua haujlwm.
Kev txiav txim siab tseem ceeb: Kev kho cua sov zaum kawg
PWHT yog qhov yuav tsum tau ua:Tom qab tag nrho cov vuam thiab sib sau ua ke, SA387 Gr 22 Cl 1 cov khoom yuav tsum tau ua tiav Daim Ntawv Tshaj Tawm - Weld Thaum tshav kub kub kho (feem ntau normalizing thiab tempering los yog sub- tempering tseem ceeb, raws li tus qauv tsim). Qhov no txo qis kev ntxhov siab thiab txhim kho qhov xav tau lub zog thiab nkag siab ua haujlwm rau siab -kev pabcuam kub.
Xaus-Siv kev sib piv:Thaum kawg, cua sov-kho lub xeev, ib feem ua los ntawm Chav Kawm 1 tuaj yeem ua tiav cov khoom siv kho tshuab zoo ib yam li ib qho ua los ntawm Chav Kawm 2. Qhov kev xaiv feem ntau yog los ntawm kev tsim khoom thiab nqi.
Summary: Chav Kawm 1 vs. Chav Kawm 2 (Quick Comparison)
| Feature | SA387 Qib 22 Chav Kawm 1 (Annealed) | SA387 Qib 22 Chav Kawm 2 (N&T) |
|---|---|---|
| Cov txiaj ntsig tseem ceeb | Superior formability & machinability nyob rau hauv raws li -muab lub xeev. | Siab dua li - muab lub zog; npaj rau nruab nrab txoj kev. |
| Hom Siv Case | Complex fabrications xav tau hnyav ua hauj lwm txias ua ntej zaum kawg PWHT. | Txheem fabrications qhov twg lub phaj tuaj yeem siv tau raws li - muab tom qab kev tsim qauv. |
| Lub Xeev kawg | Yuav tsum muaj tag nrho PWHT tom qab kev tsim khoom los tsim cov khoom pabcuam. | Tej zaum tsuas yog xav tau kev ntxhov siab tom qab vuam, nyob ntawm txoj cai. |
Hauv qhov tseem ceeb, SA387 Qib 22 Chav Kawm 1 yog qhov kev xaiv zoo tshaj plaws rau cov neeg tsim khoom uas xav tau cov khoom muag muag, ua haujlwm tau zoo rau cov khoom siv, nrog rau kev nkag siab tias qhov kev kho cua sov zaum kawg yog ib qho tseem ceeb thiab tsim nyog cov kauj ruam kom ua tiav qhov kev ua tau zoo uas yuav tsum tau ua rau siab -kub siab lub nkoj kev pabcuam.
SA387 Qib 22 Chav Kawm 1 yog dab tsi?
SA387 Qib 22 Chav Kawm 1 yog ib qho annealed chromium-molybdenum alloy steel phaj tsim los rau siab- kub siab kev pab cuam lub nkoj, nrog ib tug muaj pes tsawg leeg ntawm 2.25% Cr thiab 1% Mo los tiv thaiv oxidation thiab hydrogen nres nyob rau hauv refinery thiab fais fab nroj tsuag daim ntaub ntawv.
Dab tsi yog cov yam ntxwv ntawm SA387 Qib 22 Chav Kawm 1?
Nyob rau hauv nws cov mob annealed, SA387 Qib 22 Chav Kawm 1 feem ntau muaj lub zog tensile ntawm 415-585 MPa (60-85 ksi), qhov tsawg kawg nkaus lub zog ntawm 205 MPa (30 ksi), thiab ductility siab, ua rau nws tsim nyog rau kev tsim hnyav ua ntej kev kho cua sov kawg.
SA387 Qib 22 Chav Kawm 1 feem ntau siv nyob qhov twg?
Nws yog dav siv nyob rau hauv hydroprocessing reactors, hydrocrackers, tshav kub exchangers, thiab siab -kub siab hlab ntsha nyob rau hauv petrochemical thiab fais fab kev lag luam, tshwj xeeb tshaj yog qhov yuav tsum tau tiv thaiv hydrogen nres thiab creep.
SA387 Qib 22 Chav Kawm 1 txawv li cas ntawm Chav Kawm 2?
Chav Kawm 1 yog nkag rau hauv lub xeev annealed kom zoo formability, thaum Class 2 normalized thiab tempered rau siab dua li - xa lub zog. Chav kawm 1 raug xaiv thaum xav tau kev tsim khoom ua ntej ua ntej PWHT zaum kawg.
Post-weld heat treatment (PWHT) yog dab tsi rau SA387 Qib 22 Chav Kawm 1?
PWHT yog qhov yuav tsum tau ua thiab feem ntau ua tiav ntawm 1250-1300℃F (675-705 degree) txhawm rau txo cov kev ntxhov siab ntawm vuam, tiv thaiv hydrogen-induced cracking, thiab rov ua kom corrosion nyob rau hauv qhov vuam cheeb tsam rau kev pab kub kub.
Dab tsi yog cov ntaub ntawv sib npaug rau SA387 Qib 22 Chav Kawm 1?
Cov khoom sib npaug muaj xws li UNS K21590, European 10CrMo9-10 (1.7380), thiab generic designation 2.25Cr-1Mo steel. Txawm li cas los xij, qhov sib npaug sib npaug yog nyob ntawm kev kho cua sov thiab cov ntawv pov thawj uas yuav tsum tau ua.
SA387 Qib 22 Chav Kawm 1 puas tuaj yeem siv rau hauv kev pabcuam hydrogen?
Yog lawm, nws 2.25% chromium thiab 1% molybdenum cov ntsiab lus muab kev tiv thaiv zoo rau siab -kub hydrogen nres (HTHA), ua rau nws xaiv tus qauv rau hydrogen ua units hauv refineries.
Cov txheej txheem tsim thiab machining rau SA387 Qib 22 Chav Kawm 1 yog dab tsi?
Vim nws qhov kev mob annealed, nws muaj qhov zoo txias formability tab sis yuav tsum tau preheating rau kub sib sau thiab tswj machining kom tsis txhob ua hauj lwm ntau hardening, nrog rau cov cuab yeej haum rau alloy steels.
Cov qauv dab tsi tau lees paub SA387 Qib 22 Chav Kawm 1 daim hlau?
Cov phaj tau ntawv pov thawj rau ASME SA387 / SA387M thiab ASTM A387 / A387M cov qauv, nrog rau cov ntawv tshaj tawm zeb xeem (MTRs) muab cov khoom siv tshuaj thiab cov khoom siv ib puag ncig EN 10204 3.1 lossis 3.2.
SA387 Qib 22 Chav Kawm 1 piv rau Qib 11 lossis Qib 5 li cas?
Piv rau qib qis -alloy qib zoo li Qib 11 (1.25Cr-}0.5Mo) lossis Qib 5 (5Cr-0.5Mo), Qib 22 muaj qhov zoo tshaj qhov kub thiab txias zog thiab hydrogen tsis kam, tab sis yuav tsum tau nruj dua vuam thiab kev kho cua sov tswj.
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.
