A387 Qib 5 Chav Kawm 2 VS A387 Qib 5 Chav Kawm 1
A387 Qib 5 Chav Kawm 1
ASTM A387 Qib 5 Chav Kawm 1 yog ib qho annealed chromium-molybdenum (5Cr-}0.5Mo) alloy steel phaj npaj rau kev pabcuam siab kub siab, muab rau hauv qhov muag muag kom ua kom cov ductility thiab pab txhawb kev ua haujlwm hnyav ua ntej kev kho cua sov kawg.
A387 Qib 5 Chav Kawm 2
ASTM A387 Qib 5 Chav Kawm 2 yog ib qho qub thiab tempered chromium-molybdenum (5Cr-0.5Mo) alloy steel phaj tsim rau welded siab hlab ntsha ua haujlwm ntawm qhov kub siab, muab lub zog siab dua li Chav Kawm 1 rau kev tsim kom muaj txiaj ntsig zoo dua thaum tuav zoo toughness thiab corrosion kuj.
Qhov sib txawv ntawm A387 Qib 5 Chav Kawm 2 thiab A387 Qib 5 Chav Kawm 1 tsis yog tshuaj lom neeg muaj pes tsawg leeg, tab sis tag nrho hauv lawv cov kev kho cua sov thiab ua rau cov khoom siv kho tshuab. Qhov kev xaiv no yog qhov kev txiav txim siab hauv engineering raws li qhov xav tau lub zog thiab daim ntawv thov.
| Feature | A387 Qib 5 Chav Kawm 1 | A387 Qib 5 Chav Kawm 2 |
|---|---|---|
| Cov xwm txheej txheem | Annealed (tag nrho softened) | Normalized thiab Tempered (N&T) |
| Lub Hom Phiaj | Txhawm rau muab cov khoom siv softer, ntau cov khoom siv nrog qhov siab tshaj plaws thiab kev ruaj ntseg rau kev sib sau hnyav lossis qhov chaw kub kub tom qab / PWHT yog qhov kawg kev kho cua sov. | Txhawm rau muab lub zog ntau dua rau kev tsim qauv, tso cai rau cov ntu nyias lossis cov kev ntsuas siab dua nyob rau hauv raws li -muab khoom. |
| Tensile zog | 415-585 MPa (60-85 ksi) | 485-620 MPa (70-90 ksi) |
| Yield zog (Min.) | 205 MPa (30 ksi) | 310 MPa (45 ksi) |
| Qhov Tseem Ceeb Mechanical Difference | Tsawg zog, siab dua Ductility. softer thiab yooj yim dua rau daim ntawv / txias ua haujlwm hauv khw. | ~ 50% Siab zog tawm los. Muaj zog nyob rau hauv raws li -xa lub xeev. |
| Hardness (Tswj) | qis (piv txwv li, Max ~ 201 HB) | Siab dua (piv txwv li, 149-217 HB) |
| Microstructure | Mos ferrite-pearlite qauv los ntawm qeeb txias. | Muaj zog, ntau refined bainitic / ferritic qauv los ntawm kev tswj kom txias thiab tempering. |
| Kev cuam tshuam rau Fabrication | Feem ntau nyiam rau kev ua haujlwm txias lossis txias txias (xws li, lub taub hau sib sib zog nqus) vim nws tsis tshua muaj kev tawg. Tom qab tsim, tag nrho lub nkoj tau txais PWHT zaum kawg. | Tej zaum yuav xav tau kev saib xyuas ntau dua thaum lub caij txias. Nws raws li - cov khoom siv tau ze dua rau qhov kawg tsim qauv, uas tuaj yeem ua kom yooj yim rau kev tsim nyog. |
| Tshaj tawm -Kev kho cua sov (PWHT) | Ib txwm xav tau tom qab vuam. Lub PWHT ua tau zoo dhau los ua qhov kawg tempering kho rau qhov vuam. | Ib txwm xav tau tom qab vuam. Lub PWHT yuav tsum tau tswj kom tsis txhob nyob rau hauv - temper lub hauv paus hlau (feem ntau ua nyob rau hauv ib tug qis kub tshaj qhov qub temper). |
| Nqi & Muaj | Me ntsis tsawg dua li Chav Kawm 2 rau cov qauv phaj xaj. | Qhov feem ntau tau teev tseg thiab stocked mob rau siab hlab ntsha daim hlau. |
Yuav Xaiv Li Cas: Chav Kawm 1 vs. Chav Kawm 2
Xaiv A387 Qib 5 Chav Kawm 1 thaum:
Cov tivthaiv yuav tsum tau ua kom txias txias los yog shaping hauv khw.
Tus tsim tsis xav tau lub zog siab dua ntawm Chav Kawm 2.
Tag nrho lub nkoj tsim khoom yuav dhau los ua PWHT zaum kawg uas yuav tsim cov khoom kawg sib npaug.
Xaiv A387 Qib 5 Chav Kawm 2 thaum:
Siab dua li - yuav tsum muaj lub zog txaus rau tus qauv tsim (tso cai kom txuag tau qhov hnyav lossis siab dua).
Nws yog tus txheej txheem, npaj tau npaj txhij.
Cov fabrication suav nrog cov qauv vuam thiab kev tsim me me, thiab koj xav tau cov khoom siv ze dua rau qhov kawg tsim spec upfront.
Cov Lus Qhia Tseem Ceeb: Ob chav kawm muaj cov tshuaj sib xyaw ua ke (5% Chromium, 0.5% Molybdenum). Qhov sib txawv yog tsim los ntawm lub zeb kev kho cua sov. Rau qhov ua tiav, code-stamped siab hlab ntsha, ob leeg yuav dhau mus rau qhov kawg PWHT, uas ua kom sib haum xeeb ntawm cov khoom siv vuam. Tus tsim qauv xaiv qhov pib mob (Class 1 lossis 2) raws li qhov xav tau ntawm cov qauv tsim kev ntxhov siab (pom hauv ASME Tshooj II, Ntu D) thiab cov khoom xav tau.
Hauv cov ntsiab lus: Chav Kawm 1 yog qhov softer, ntau formable xaiv; Chav Kawm 2 yog qhov kev xaiv muaj zog, ntau dua. Qhov kev xaiv yog kev lag luam - tawm ntawm fabricability thiab tsim lub zog.
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 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. Tus qauv kho cua sov yog dab tsi 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.
