SA387 Qib 11 Chav Kawm 2 txawv li cas ntawm Chav Kawm 1?
SA387 Qib 11 Chav Kawm 1
SA387 Qib 11 Chav Kawm 1 yog ib qhoannealedchromium-molybdenum (1¼Cr-½Mo) 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 nws cov kev pab cuam zaum kawg yog tsim los ntawm post-weld kho cua sov.
SA387 Qib 11 Chav Kawm 2
SA387 Qib 11 Chav Kawm 2 yog anormalized thiab temperedchromium-molybdenum (1¼Cr-½Mo) alloy steel phaj rau welded siab hlab ntsha, muab siab dua li - xa lub zog dua li Chav Kawm 1 rau kev tsim kev ua haujlwm zoo thaum tuav qhov zoo tib yam rau siab -kub hydrogen nres thiab nkag tom qab yuav tsum tau xa-weld kho cua sov.
Qhov sib txawv ntawm SA387 Qib 11 Chav Kawm 2 thiab Chav Kawm 1 yog tag nrho hauv lawv cov kev kho cua sov thiab ua rau cov khoom siv kho tshuab- tsis nyob hauv cov tshuaj muaj pes tsawg leeg. Ob leeg sib koom tib yam 1.25% Chromium thiab 0.5% Molybdenum chemistry, tab sis tau muab rau hauv ntau lub xeev los ua haujlwm sib txawv hauv kev tsim cov hlab ntsha.
| Feature | SA387 Qib 11 Chav Kawm 1 | SA387 Qib 11 Chav Kawm 2 |
|---|---|---|
| Kev kho cua sov | Annealed (Lub qhov cub txias rau softness) | Normalized & Tempered (N&T) |
| Lub Hom Phiaj | Optimized rau siab tshaj plaws ductility & formability. | Optimized rau siab dua li - muab lub zog. |
| Microstructure | Mos ferrite -pearlite ( ntxhib, equilibrium) | Muaj zog bainite / tempered bainite (refined) |
| 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) |
| Ntsiab Mech. Qhov txawv | Tsawg zog, siab dua ductility. | ~ 34% siab zog tawm los. |
| Fabrication cuam tshuam | Zoo heev rau kev mob khaub thuas hnyav (sib sib zog nqus, nruj- vojvoog dov). Tsawg kev pheej hmoo ntawm kev tawg. | Haum rau nruab nrab txoj kev. Lub zog siab dua yuav xav tau kev saib xyuas ntau dua thaum ua haujlwm txias. |
| Tsim Tso Cai Stress (ASME) | Zoo tib yam rau Chav Kawm 2 ntawm txhua qhov kub. | Zoo tib yam rau Chav Kawm 1 ntawm txhua qhov kub thiab txias. |
| Tshaj tawm -Kev kho cua sov (PWHT) | Yuav tsum tau. PWHT tempers cov khoom, tsa nws lub zog kawg. | Yuav tsum tau. PWHT yuav tsum tau tswj kom tsis txhob dhau - tempering. |
Engineering Philosophy Tom Qab Ob Chav Kawm
Chav Kawm 1 yog "Fabricator's Choice":Nws tau muab cov mos mos thiab ductile yog li nws tuaj yeem ua tau yooj yim zoo li hauv cov khoom sib xyaw (xws li, tuab, hau hau, forged nozzles). Tus tsim qauv lag luam pib lub zog rau kev yooj yim ntawm kev tsim khoom, paub qhov kawg PWHT yuav tsim cov khoom siv uas xav tau.
Chav Kawm 2 yog "Tus Tsim Qauv / Kev Xaiv Tus Qauv":Nws tau muab cov khoom muaj zog, tso cai rau tus kws ua haujlwm siv cov kev xav tau siab dua nyob rau hauv kev tsim thawj zaug, uas tuaj yeem ua rau cov phab ntsa nyias nyias. Nws yog qhov ntau tshaj plaws thiab yooj yim muaj nyob rau hauv Tshuag rau cov nkoj dav dav fabrication.
Cov Lus Qhia Tseem Ceeb: Kev Sib Koom Tes Tom Qab PWHT
Txawm hais tias lawv cov ntsiab lus pib sib txawv, qhov siab - qhov kub thiab txias ua tau zoo sib npaug tom qab kev tsim khoom thiab PWHT. 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 (1.25Cr-0.5Mo), uas yog zoo tib yam.
Yuav xaiv li cas?
Xaiv Chav Kawm 1yog tias koj lub nkoj tsim muaj xws li complex, hnyav heev - tsim cov khoom.
Xaiv Chav 2rau cov qauv tsim lub nkoj uas siab dua li - lub zog muab khoom tau txais txiaj ntsig thiab kev tsim yog niaj hnub.
Hauv essence:
Class 1 yog optimized rau lub rooj cob qhia (formability), thaum chav kawm 2 yog optimized rau lub rooj tsavxwm (lub zog). Tom qab tsim nyog PWHT, ob qho tib si ua tau zoo ib yam hauv siab - kev pabcuam hydrogen kub.
1. SA387 Qib 11 Chav Kawm 2 yog dab tsi?
SA387 Qib 11 Chav Kawm 2 yog ib qho qub thiab tempered chromium-molybdenum (1¼Cr-½Mo) alloy steel phaj tsim los rau siab -kub siab cov hlab ntsha, muab lub zog siab dua li Chav Kawm 1 thaum tswj kev zoo weldability thiab creep kuj nyob rau hauv refinery kev pab cuam.
2. Cov khoom siv kho tshuab ntawm SA387 Qib 11 Chav Kawm 2 yog dab tsi?
Nyob rau hauv nws qhov normalized thiab tempered mob, SA387 Qib 11 Chav Kawm 2 muab lub zog tensile ntawm 485–620 MPa (70–90 ksi) thiab qhov tsawg kawg nkaus tawm lub zog ntawm 275 MPa (40 ksi), ua rau nws haum rau siab - kev nyuaj siab, elevated - kub tsim
3. SA387 Qib 11 Chav Kawm 2 txawv li cas ntawm Chav Kawm 1?
Class 2 yog normalized thiab tempered rau siab dua li -suplied zog, thaum Class 1 yog annealed rau siab tshaj formability; ob leeg sib koom tib yam tshuaj muaj pes tsawg leeg tab sis raug xaiv raws li fabrication xav tau kev pab thiab tsim kom muaj kev ntxhov siab.
4. Qhov kev pabcuam siab tshaj plaws rau SA387 Qib 11 Chav Kawm 2 yog dab tsi?
SA387 Qib 11 Chav Kawm 2 feem ntau yog siv hauv kev pabcuam txuas ntxiv mus txog 595℃(1100℃F), qhov twg nws cov ntsiab lus chromium thiab molybdenum muab kev tiv thaiv zoo rau oxidation thiab hydrogen nres.
5. Dab tsi yog cov ntawv thov rau SA387 Qib 11 Chav Kawm 2 daim hlau?
Qib no yog siv dav hauv hydrotreaters, hydrocrackers, heat exchangers, thiab lwm yam siab -kub siab cov hlab ntsha hauv petrochemical refineries thiab fais fab - tiam.
6. Cov txheej txheem vuam dab tsi yuav tsum tau ua rau SA387 Qib 11 Chav Kawm 2?
Vuam yuav tsum tau qis -hydrogen electrodes, preheating (150–205℃/ 300–400℃F), thiab yuav tsum tau post-weld heat treatment (PWHT) nyob ib ncig ntawm 620–690℃(1150–1275℃F) los tiv thaiv kev tawg thiab rov ua kom corrosion.
7. Qhov sib npaug European qib rau SA387 Qib 11 Chav Kawm 2 yog dab tsi?
Qhov sib npaug nyob sab Europe zoo tshaj plaws yog 13CrMo4-5 (1.7335) raws li EN 10028-2, uas muaj cov ntsiab lus zoo sib xws thiab feem ntau muab nkag rau hauv ib qho xwm txheej thiab tempered.
8. SA387 Qib 11 Chav Kawm 2 piv rau Qib 22 li cas?
Qib 11 (1.25Cr-0.5Mo) muaj qis dua - qhov kub thiab txias zog thiab hydrogen tsis kam tshaj Qib 22 (2.25Cr-1Mo), ua rau nws muaj txiaj ntsig zoo rau kev pab cuam nruab nrab hauv kev ua kom zoo thiab cov txheej txheem tshuaj lom neeg.
9. Charpy cuam tshuam dab tsi rau SA387 Qib 11 Chav Kawm 2 yog dab tsi?
Charpy V-notch impact test feem ntau teev los ntawm cov neeg yuav khoom; Cov kev xav tau ntau tshaj yog 20 J (15 ft-lb) qhov nruab nrab qhov nruab nrab ntawm qhov kub ntawm +10℃F thiab -20℃F (–12℃txog -29 degree) rau kev siv lub nkoj siab.
10. Qhov txawv ntawm SA387 Qib 11 Chav Kawm 2 thiab AISI 4130 yog dab tsi?
Thaum ob qho tib si yog Cr-Mo steels, SA387 Qib 11 Chav Kawm 2 yog cov khoom siv phaj rau cov hlab ntsha siab nrog cov kev cai nruj thiab kev sim, qhov AISI 4130 yog lub hom phiaj dav dav / bar alloy nrog cov khoom sib txawv thiab kev siv.
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.
