SA387 Qib 22 Chav Kawm 1 txawv li cas ntawm Chav Kawm 2?
SA387 Qib 22 Chav Kawm 1
SA387 Qib 22 Chav Kawm 1 yog ib qho annealed 2.25Cr-1Mo alloy steel phaj tsim rau siab -kub siab cov hlab ntsha, muab nyob rau hauv ib tug softened mob los muab siab tshaj plaws ductility thiab formability rau complex fabrication ua ntej zaum kawg post-weld kev kho cua sov tsim nws cov kev pab cuam lub zog.
SA387 Qib 22 Chav Kawm 2
SA387 Qib 22 Chav Kawm 2 yog ib txwm ua thiab tempered 2.25Cr-1Mo alloy steel phaj rau welded siab hlab ntsha, muab siab dua li - xa lub zog dua li Chav Kawm 1 rau kev tsim qauv zoo dua thaum tswj kev ua haujlwm zoo rau siab -kub hydrogen nres thiab nkag tom qab yuav tsum tau ua tom qab kev kho cua sov.
Qhov sib txawv ntawm SA387 Qib 22 Chav Kawm 1 thiab Chav Kawm 2 yog tag nrho hauv lawv cov kev kho cua sov thiab ua rau cov khoom siv kho tshuab, tsis yog tshuaj lom neeg muaj pes tsawg leeg. Ob leeg muaj chemistry zoo tib yam (2.25% Cr, 1% Mo), tab sis lawv tau muab rau hauv ntau lub xeev los ua haujlwm sib txawv hauv kev tsim cov hlab ntsha.
| Feature | SA387 Qib 22 Chav Kawm 1 | SA387 Qib 22 Chav Kawm 2 |
|---|---|---|
| Cov xwm txheej txheem | Annealed (Lub qhov cub txias) | Normalized thiab Tempered (N&T) |
| Lub Hom Phiaj | Txhawm rau muab qhov siab tshaj plaws ductility thiab formability rau hnyav txias / kub sib sau thaum lub sij hawm fabrication. | Txhawm rau muab siab dua li - xa lub zog rau kev tsim qauv kev ua haujlwm thiab kev tsim qauv me me. |
| Microstructure | Mos ferrite-pearlite ( ntxhib, qauv sib npaug). | Stronger, tougher bainite/tempered bainite (refined, transformed structure). |
| Tensile zog | 415 - 585 MPa (60 - 85 ksi) | 485 - 620 MPa (70 - 90 ksi) |
| Yield zog (Min.) | 205 MPa (30 ksi) | 275 MPa (40 ksi) |
| Qhov Tseem Ceeb Mechanical Difference | Tsawg zog, siab dua ductility. Optimized rau kev tsim muaj peev xwm. | ~ 34% siab zog tawm los. Optimized rau raws li - muab lub zog. |
| Fabrication cuam tshuam | Zoo heev rau kev sib sau ua ke (xws li, sib sib zog nqus ntawm lub taub hau, nruj- vojvoog dov). Tsis tshua muaj kev pheej hmoo ntawm kev tawg thaum ua haujlwm txias. | Tej zaum yuav tsum tau ua tib zoo sib sau ua ke; zoo dua haum rau nruab nrab txoj kev thiab txheem fabrication. |
| Tshaj tawm -Kev kho cua sov (PWHT) | Yuav tsum tau. PWHT tempers cov khoom, tsa nws lub zog zaum kawg mus rau Qib 2. | Yuav tsum tau. PWHT yuav tsum tau tswj kom tsis txhob dhau -tempering lub hauv paus hlau. |
| Thaum kawg hauv -Service Strength | Tom qab PWHT, txoj hauv kev tab sis tsis ncav cuag lub zog ntawm Chav Kawm 2. Tus nqi tsim kev ntxhov siab (ASME) zoo ib yam rau ob chav kawm. | Khaws lub zog ntau dua -PWHT. Tus nqi tsim kev ntxhov siab (ASME) zoo ib yam rau ob chav kawm. |
| Common Selection Driver | "Fabricability First" - Xaiv thaum cov khoom siv geometry yog qhov nyuaj thiab xav tau kev tsim ntau. | "Lub Zog Ua Ntej" - Xaiv rau cov qauv nkoj uas siab dua li - lub zog muab tso rau cov phab ntsa nyias nyias lossis cov khoom siv yooj yim dua. |
Lub Core Philosophy Tom Qab Ob Chav Kawm:
Chav Kawm 1(Annealed) yog "Fabricator's Choice": Nws tau muab cov mos mos kom nws tuaj yeem ua tau yooj yim zoo li cov khoom siv (xws li, hnyav reactor taub hau, forged nozzles los ntawm phaj). Tus neeg tsim khoom txi lub zog thawj zaug rau kev yooj yim ntawm kev tsim khoom, paub tias qhov kawg PWHT yuav tsim cov khoom siv yuav tsum tau ua.
Chav kawm 2(N&T) yog "Tus Tsim Tsim Kev Xaiv": Nws tau muab cov khoom muaj zog, tso cai rau tus kws ua haujlwm siv cov kev xav tau siab dua hauv kev tsim qauv tsim, uas yuav txuag tau qhov hnyav (thinner phab ntsa). Nws yog haum rau feem ntau cov nkoj txheem.
Cov Lus Cim Tseem Ceeb: Kev Sib Tham Tom Qab PWHT
Thaum lawv raws li - lub xeev muab khoom sib txawv heev, qhov kawg siab kawg - qhov kub thiab txias ua haujlwm tau zoo tom qab kev kho cua sov kom zoo. ASME Boiler thiab Pressure Vessel Code (Tshooj II, Ntu D) muab cov txiaj ntsig siab tshaj plaws uas tso cai rau ob chav kawm 1 thiab Chav Kawm 2 ntawm txhua qhov kub. Qhov no yog vim:
Ob leeg tau txais PWHT zaum kawg.
Lub siab - kub creep zog yog tswj hwm los ntawm cov alloy muaj pes tsawg leeg (2.25Cr-1Mo), uas yog zoo tib yam.
Yuav xaiv li cas?
Xaiv Chav Kawm 1Yog tias koj lub nkoj muaj qhov nyuaj, tsim ntau qhov chaw.
Xaiv Chav 2yog tias koj muaj tus qauv tsim lub nkoj uas siab dua li - lub zog muab khoom tau txais txiaj ntsig thiab kev tsim yog niaj hnub.
Hauv cov ntsiab lus: Chav Kawm 1 yog qhov zoo rau kev cob qhia; Chav Kawm 2 yog optimized rau daim duab kos duab. Ob qho tib si, tom qab kev tsim khoom thiab kev kho cua sov kom zoo, ua tau zoo ib yam hauv siab -kub hydrogen 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 lub nkoj kev pab cuam, nrog rau cov muaj pes tsawg leeg ntawm 2.25% Cr thiab 1% Mo los tiv thaiv oxidation thiab hydrogen nres 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 qab corrosion kuj nyob rau hauv qhov vuam cheeb tsam rau high-temperature kev pab cuam.
Dab tsi yog cov khoom 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.
Dab tsi yog cov txheej txheem tsim thiab machining rau SA387 Qib 22 Chav Kawm 1?
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 hnyav heev, 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 cov ntawv tshaj tawm zeb xeem (MTRs) muab cov khoom siv tshuaj lom neeg thiab khoom siv rau 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.
