A387 Qib 5 Chav Kawm 2 yog dab tsi?
Qhov ncaj tshaj plaws thiab dav lees paub sib npaug rau ASTM A387 Qib 5 Chav Kawm 2 yog nws qhov kev xaiv hauv ASME Boiler thiab Pressure Vessel Code: SA-387 Qib 5 Chav Kawm 2.
Nov yog nws qhov tseem ceeb thoob ntiaj teb thiab kev lag luam sib npaug, nrog rau cov ntawv tseem ceeb ntawmmob.
| Standard / cheeb tsam | Kev Cai Sib Tw | Ntsiab Lus |
|---|---|---|
| ASME(USA) | SA-387 Gr.5 Cl.2 | Qhov yuav tsum tau ua tshwj xeeb rau ASME code siab lub nkoj tsim. |
| UNS(USA) | K41545 | Unified Numbering System identifier. |
| EN / DIN(Tebchaws Europe) | 10CrMo5-5 (1.7362) | Qhov ze tshaj plaws European siab nkoj steel. Kev sib xyaw thiab kev siv tau zoo sib xws. Feem ntau siv interchangeably. |
| Lub npe Alloy | 5Cr-0.5Mo | Kev lag luam luv luv raws li nws cov nominal 5% Chromium, 0.5% Molybdenum cov ntsiab lus. |
Qhov Tseem Ceeb Rau Kev Siv: Chav 2 vs. Chav Kawm 1
A387 Qib 5 Chav Kawm 2 yog nkag rau hauv cov xwm txheej zoo li qub thiab tempered, uas ua rau nws muaj zog dua.
A387 Qib 5 Chav Kawm 1 yog nkag rau hauv qhov mob annealed (softer, qis zog). Feem ntau thoob ntiaj teb kev yuav khoom thiab kev tsim qauv engineering xav tias Chav Kawm 2 (N&T) mob rau siab - qhov kub thiab txias.
Yog li ntawd, thaum qhia lossis tshawb nrhiav qhov sib npaug, koj yuav tsum nco ntsoov suav nrog "Class 2" kom ntseeg tau tias koj tau txais qhov tseeb, siab dua - lub zog cua sov- cov khoom kho.
Cov ntsiab lus: Rau cov haujlwm thoob ntiaj teb, qhov sib npaug tseem ceeb yog SA-387 Gr.5 Cl.2 (ASME) thiab 10CrMo5-5 (EN/DIN). Lub npe 5Cr-0.5Mo kuj tseem nkag siab thoob plaws hauv cov ntaub ntawv qhia kev thiab kev sib tham hauv kev lag luam.
1. Cov tshuaj muaj pes tsawg leeg ntawm A387 Qib 5 txawv li qib 11 lossis qib 12 li cas?
A387 Qib 5 yog ntau dua -chromium alloy steel, feem ntau muaj nyob ib ncig ntawm 5% chromium thiab 0.5% molybdenum. Qhov no tso nws nyob nruab nrab ntawm Qib 11 ntau dua (~ 1.25% Cr) thiab Qib 22 (~ 2.25% Cr), muab nws qhov zoo sib xws ntawm oxidation tsis kam thiab nce siab -qhov kub thiab txias piv rau qis dua- qib alloy, thaum muaj peev xwm ua tau tus nqi ntau dua -{3} kev pab cuam ntau dua li steel.
2. Dab tsi yog Qhov Kev Pab Cuam Tshaj Plaws Hauv Tsev Kawm Ntawv Qib Siab 2?
Lub hom phiaj tseem ceeb ntawm A387 Qib 5 Chav Kawm 2 yog nyob rau hauv nws qhov kev tiv thaiv oxidation zoo dua thiab muaj zog tuav ntau dua ntawm qhov kub thiab txias feem ntau yog li ntawm 540℃mus rau 600℃(1000℃F txog 1112℃F), tshaj qhov muaj peev xwm ntawm Qib 11 lossis 12. Qhov no ua rau nws tsim nyog rau cov khoom siv hauv catalytic furnacetro lwm qhov kev pabcuam hnyav, kev hloov pauv ntawm cov khoom siv hluav taws xob, scaling thiab creep yog kev txhawj xeeb tseem ceeb.
3. Dab tsi yog qhov tseem ceeb ntawm Vuam thiab Fabrication Considerations rau A387 Gr.5 Cl.2?
Vuam A387 Qib 5 Chav Kawm 2 yuav tsum muaj cov txheej txheem nruj vim nws cov ntsiab lus alloy siab dua. Nws xav tau qhov yuav tsum tau ua kom sov (feem ntau yog 175-250℃/ 350-480℃F) thiab nruj tswj qhov kub thiab txias los tiv thaiv qhov nyuaj, tawg-sensitive microstructures. Tsis tas li ntawd, qhov yuav tsum tau ua tom qab Weld Heat Treatment (PWHT) nyob rau hauv thaj tsam ntawm 675-730℃(1250-1350℃F) yog qhov tseem ceeb kom npau taws rau thaj tsam weld, txo kev ntxhov siab, thiab rov ua kom corrosion.
4. Dab tsi yog Tus Txheej Txheem Kev Kho Hniav Kub Rau A387 Qib 5 Chav Kawm 2 Phaj?
A387 Qib 5 Chav Kawm 2 daim hlau tau muab rau hauv cov xwm txheej zoo li qub thiab Tempered. Normalizing muaj cua sov saum toj no qhov kev hloov pauv thiab cua txias kom ua kom zoo dua cov qauv nplej, ua raws li tempering ntawm sub- kub tseem ceeb kom ua tiav qhov kev pom zoo ua ke ntawm lub zog thiab cov khoom siv tau teev tseg hauv tus qauv (feem ntau yog qhov tsawg kawg nkaus lub zog ntawm 310 MPa / 45 ksi).
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.
