Qhov txawv ntawm SA387 Qib 12 Chav Kawm 1 thiab SA387 Qib 12 Chav Kawm 2 yog dab tsi?
SA387 Qib 12 Chav Kawm 1yog ib qho chromium-molybdenum alloy steel phaj (1% Cr, 0.5% Mo) muab nyob rau hauv cov txheej txheem annealed, muab qis zog tab sis siab ductility thiab zoo heev txias formability, ua rau nws zoo tagnrho rau cov khoom uas yuav tsum tau loj shaping ua ntej ib tug zaum kawg ncej-weld kho cua sov.
SA387 Qib 12 Chav Kawm 2yog tib yam chromium-molybdenum alloy steel phaj (1% Cr, 0.5% Mo) tab sis muab nyob rau hauv qhov qub thiab tempered mob, muab siab dua li - xa lub zog thiab toughness, thiab feem ntau yog xaiv rau cov ntawv thov uas xav tau kev tsim me me thiab cov khoom siv tuaj yeem siv tau rau hauv kev npaj ntau dua -toric{5}
Qhov sib txawv tseem ceeb ntawm SA387 Qib 12 Chav Kawm 1 thiab Chav Kawm 2 nyob rau hauv lawv cov kev kho cua sov, uas ua rau muaj qhov sib txawv tseem ceeb hauv cov khoom siv kho tshuab, kev tsim khoom tsim nyog, thiab kev siv ua ntu zus.
| Feature | SA387 Qib 12 Chav Kawm 1 | SA387 Qib 12 Chav Kawm 2 |
|---|---|---|
| Kev kho cua sov | Annealed | Normalized & Tempered (N + T) |
| Lub hom phiaj tseem ceeb ntawm kev kho mob | Tsim kom muaj qhov muag muag, zawv zawg, thiab kev ntxhov siab -relied qauv rau kev tsim loj heev. | Txhawm rau tsim kom muaj zog, tougher microstructure npaj rau kev pabcuam nruab nrab tom qab vuam. |
| Mechanical Properties (Tswj) | Tsawg zog, siab dua Ductility • Tensile: 415-585 MPa (60-85 ksi) • Tawm tswv yim (Min): ~ 205 MPa (30 ksi) • Siab dua elongation • Tsawg Hardness |
Siab zog, zoo Ductility • Tensile: 485-655 MPa (70-95 ksi) • Tawm tswv yim (Min): ~ 275 MPa (40 ksi) • Zoo elongation • Siab Hardness |
| Key Fabrication Advantage | Zoo heev rau kev mob khaub thuas hnyav (xws li, hnyav dabtsi yog khoov, spinning) thiab machining vim softness. | Siab dua li - muab lub zog tso cai rau cov qauv tsim; zoo rau nruab nrab txoj kev. |
| Tshaj tawm -Kev kho cua sov (PWHT) | Yuav tsum muaj tag nrho PWHT (feem ntau normalizing & tempering) tom qab fabrication yog yuav tsum tau tsim cov kev pab cuam. | Tej zaum tsuas yog yuav tsum tau muaj kev ntxhov siab tom qab vuam (nyob ntawm txoj cai thiab tuab), raws li lub zog tau tsim. |
| Metallurgical State | Mos ferrite nrog ntxhib carbides; uniform thiab ruaj khov. | Zoo-grained tempered microstructure nrog lub zog ntau dua. |
| Nqi Factor | Tus nqi pib qis dua rau lub phaj (yooj yim annealing), tab sis ntxiv tus nqi / qhov nyuaj ntawm qhov yuav tsum tau ua zaum kawg PWHT. | Tus nqi pib siab dua (ntau dua N + T), tab sis tuaj yeem txo tag nrho cov nqi tsim khoom / sij hawm los ntawm kev txo qis kawg kev kho cua sov. |
| Hom Daim Ntawv Thov Ib Ntus | Phaj → Severe Forming/Machining → Vuam → Full PWHT → Service | Phaj → Moderate Forming → Welding → (Possible Stress Relief) → Service |
Yuav xaiv li cas: Summary
Xaiv SA387 Qib 12 Chav Kawm 1 thaum:
Koj cov khoom yuav tsum tau ua kom txias txias los yog siv dav siv tshuab.
Koj muaj peev xwm thiab npaj ua ib tug tag nrho normalizing & tempering tshav kub kev kho mob ntawm cov khoom tiav.
Qhov siab tshaj plaws toughness thiab formability nyob rau hauv raws li -xa lub xeev yog ib qho tseem ceeb.
Xaiv SA387 Qib 12 Chav Kawm 2 thaum:
Koj tus qauv tsim tau txais txiaj ntsig los ntawm qhov siab dua li - lub zog muab khoom (xws li, cov phab ntsa nyias nyias, tsim siab dua).
Fabrication tsuas yog siv me me (piv txwv li, lub teeb khoov, dov).
Koj xav ua kom yooj yim lossis txo qhov kev kho cua sov zaum kawg (feem ntau tsuas yog xav tau kev ntxhov siab xwb).
Koj xav tau cov khoom npaj rau kev pabcuam sai dua tom qab vuam.
Hauv essence:
Qhov kev xaiv yog kev lag luam tawm - tawm ntawm fabricability (Class 1) thiab npaj tau - rau - siv lub zog (Class 2), nrog rau qhov cuam tshuam tseem ceeb rau koj cov khoom tsim khoom thiab tag nrho cov nqi. Ob qib yuav ua tiav qhov kev pabcuam zaum kawg zoo sib xws tom qab kev tshaj tawm raug cai -kev kho cua sov. Qhov kev txiav txim siab hinges ntawm koj lub khw tsim muaj peev xwm thiab cov chaw kho cua sov.
1.Dab tsi yog SA387 Qib 12 Chav Kawm 2?
SA387 Qib 12 Chav Kawm 2 yog chromium-molybdenum alloy steel phaj tsim rau welded siab hlab ntsha, nkag rau hauv lub cev kub thiab tempered- kho mob rau kev txhim kho toughness thiab lub zog.
2.Dab tsi yog qhov txawv ntawm SA387 Gr12 Cl 1 thiab Cl 2?
Qhov sib txawv tseem ceeb yog qhov yuav tsum tau kho cua sov. Qib 12 Chav Kawm 2 yuav tsum tau muab cov khoom qub thiab ua kom sov, thaum Chav Kawm 1 tuaj yeem muab tau raws li -rolled, annealed, lossis normalized thiab tempered, cuam tshuam rau nws cov khoom siv kho tshuab.
3.Dab tsi yog cov tshuaj muaj pes tsawg leeg ntawm SA387 Qib 12 Chav Kawm 2?
Nws cov ntsiab lus muaj xws li Chromium (0.80-1.25%), Molybdenum (0.44-0.65%), Carbon (max 0.17%), Manganese (0.40-0.65%), Silicon (0.15-0.40%), thiab txwv Phosphorus thiab Sulfur.
4.Dab tsi yog cov khoom siv kho tshuab ntawm SA387 Gr12 Cl 2?
Cov khoom tseem ceeb muaj xws li lub zog tensile yam tsawg kawg nkaus ntawm 485 MPa (70 ksi) thiab qhov tsawg kawg nkaus yield zog ntawm 275 MPa (40 ksi) rau thicknesses txog li 65 hli, muaj zog ntau dua li chav 1.
5.Dab tsi yog SA387 Gr12 Cl 2 sib npaug?
Nws yog sib npaug rau ASTM A387 Gr12 Cl 2, ASME SA387 Gr12 Cl 2, thiab cov khoom siv qib UNS K11757. Nws zoo ib yam li 1.25% Cr-0.5% Mo steel.
6.Dab tsi yog kev kho cua sov rau SA387 Qib 12 Chav Kawm 2?
Raws li qhov tshwj xeeb, SA387 Qib 12 Chav Kawm 2 daim hlau tau muab nkag rau hauv qhov qub (kub siab tshaj qhov kub thiab txias thiab huab cua-txias) thiab tom qab tempered (reheated rau ib qho tshwj xeeb sub- kub tseem ceeb) mob.
7.Vim li cas thiaj xaiv Chav Kawm 2 dhau Chav Kawm 1 rau SA387 Qib 12?
Chav Kawm 2 raug xaiv thaum daim ntawv thov yuav tsum tau lees paub lub zog siab dua, zoo dua microstructural uniformity, thiab txhim kho qhov tsis zoo vim nws qhov yuav tsum tau ua kom zoo dua qub thiab tempered.
8.Qhov kev ua haujlwm siab tshaj plaws rau SA387 Gr12 Cl 2 yog dab tsi?
Nws yog feem ntau siv rau kev pabcuam kub txog li 800-850℃F (427-454 degree), tshwj xeeb tshaj yog nyob rau hauv kev pabcuam hydrogen thiab lwm yam kev siv hluav taws xob kub.
9.Yuav ua li cas rau vuam SA387 Qib 12 Chav Kawm 2 hlau?
Vuam yuav tsum tau preheating (feem ntau yog 250-400℃F / 121-204 degree) thiab yuav tsum tau kho tom qab vuam kub (PWHT). Common filler metals muaj xws li AWS E8018-B2 rau SMAW los yog sib npaug.
10.Dab tsi yog qhov nyuaj ntawm SA387 Qib 12 Chav Kawm 2?
Hardness tsis ncaj qha nyob rau hauv tus qauv tab sis yog tswj los ntawm kev kho cua sov thiab txhua yam khoom. Rau kev pabcuam hauv qhov chaw ntub dej H2S, nws feem ntau tau teev tseg kom qis dua 200 HB lossis 22 HRC los tiv thaiv sulfide kev ntxhov siab tawg.
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.
