ASTM A387 Gr. 22 yog ib qho chromium-molybdenum alloy steel phaj tshwj xeeb tsim los rau kev nce siab -kub siab siv nkoj. Tsim nyob rau hauv nruj raws li ASTM A387 / ASME SA387 tus qauv, qib no yog tsim los tswj cov khoom siv zoo heev, kev ruaj ntseg, thiab corrosion kuj nyob rau hauv siab - kub thiab siab - kev ua haujlwm siab.
Tsis zoo li cov pa roj carbon steel daim hlau xws li ASTM A516 Qib 70, peb ASTM A387 Gr. 22 siv cov kev tswj ntxiv ntawm chromium (Cr) thiab molybdenum (Mo) los ua ib qho qis - alloy Cr-Mo microstructure. Qhov no txhim kho nws txoj kev tiv thaiv thermal degradation, hydrogen nres, thiab ntev -lub sij hawm creep deformation. Yog li ntawd, nws yog qhov tsim nyog rau cov khoom siv tseem ceeb hauv kev pabcuam hnyav, suav nrog cov khoom siv hluav taws xob, cov boilers, reactors, cov hlab ntsha siab, thiab cov khoom siv petrochemical.
Cov tshuaj muaj pes tsawg leeg ntawm ASTM A387 Gr.22 alloy steel phaj
| Qib 22 | Chav Kawm 1 | Chav kawm 2 | ||
| Cov pa roj carbon Kev Ntsuas Kub |
0.05 - 0.17 | 0.05 - 0.15 | ||
| Kev tshuaj xyuas khoom | 0.04 - 0.17 | 0.04 - 0.15 | ||
| Manganese Kev Ntsuas Kub |
0.4 - 0.65 0 | 0.3 - 0.6 | ||
| Kev tshuaj xyuas khoom | 0.35 - 0.73 | 0.25 - 0.66 | ||
| Phosphorous Kev Ntsuas Kub |
0.035 | 0.035 | ||
| Kev tshuaj xyuas khoom | 0.035 | 0.035 | ||
| Sulfur Kev Ntsuas Kub |
0.035 | 0.035 | ||
| Kev tshuaj xyuas khoom | 0.035 | 0.035 | ||
| Silicon Kev Ntsuas Kub |
0.15 - 0.4 | 0.5 max | ||
| Kev tshuaj xyuas khoom | 0.13 - 0.45 | 0.5 max | ||
| Chromium Kev Ntsuas Kub |
0.8 - 1.15 | 2.0 - 2.5 | ||
| Kev tshuaj xyuas khoom | 0.74 - 1.21 | 1.88 - 2.62 | ||
| Molybdenum Kev Ntsuas Kub |
0.45 - 0.6 | 0.9 - 1.1 | ||
| Kev tshuaj xyuas khoom | 0.4 - 0.65 | 0.85 - 1.15 | ||
Lub luag haujlwm ntawm Chromium (Cr) thiab Molybdenum (Mo)
| Chromium (Cr) | Molybdenum (hli) |
| Oxidation Resistance | Txhim kho Creep Strength |
| Corrosion Resistance | Txhim kho Thermal Stability |
| Txhim kho High -kub Stability | Txo Softening ntawm qhov kub siab |
mechanical propeprty ntawm ASTM A387 Gr.22 alloy steel phaj
Cov khoom siv kho tshuab ntawm ASTM A387 Gr. 22 chromium- molybdenum alloy steel daim hlau tau ua tiav los ntawm lawv cov tshuaj muaj pes tsawg leeg zoo thiabNormalized thiab Tempered (N + T)Kev kho cua sov txheej txheem.
| Khoom | Tus nqi |
|---|---|
| Tensile zog | 515-690 MPa |
| Yield zog | Ntau dua lossis sib npaug li 310 MPa |
| Elongation (200 hli) | Ntau dua lossis sib npaug li 18% |
| Kev ntsuam xyuas cuam tshuam | Muaj raws li qhov project xav tau |
| Kev Xa Khoom | Normalized thiab Tempered (N + T) |
Specification ntawm ASTM A387 Gr.22 alloy steel phaj
|
Khoom npe |
ASTM A387 Gr.22 alloy steel phaj |
|
Khoom siv |
A387 Gr.22 |
|
Thcikness |
6 ~ 130mm raws li xav tau |
|
Dav |
1500 ~ 4100mm raws li xav tau |
|
Ntev |
3000 ~ 12000mm raws li xav tau |
|
Ua siab ntev |
1% |
|
Txuj |
ASTM A387 Cov khoom lag luam |
|
Kev xa khoom |
30 ~ 40 hnub |
Xaiv txoj cai siab lub nkoj steel qib yog qhov tseem ceeb rau cov khoom siv kev nyab xeeb thiab kev pabcuam lub neej. GNEE Steel muab ASTM A387 Gr.22 daim hlau nrog kev tswj cov tshuaj muaj pes tsawg leeg, muaj ntawv pov thawj cov khoom siv thiab qhov ntau thiab tsawg kom tau raws li cov kev xav tau sib txawv.
Kev kho cua sov txheej txheem ntawm ASTM A387 Gr.22 alloy steel phaj
Kev kho cua sov yog kev ua haujlwm tseem ceeb uas txiav txim siab qhov kawg ntawm cov khoom siv ntawm ASTM A387 Gr. 22 chromium-molybdenum alloy steel daim hlau. Raws li nruj raws li ASTM A387 / ASME SA387 tus qauv, peb cov ASTM A387 Gr. 22 daim hlau feem ntau yog muab rau hauv qhov Normalized thiab Tempered (N + T).
Normalizing txheej txheem
Thaum lub sij hawm normalizing, ASTM A387 Gr. 22 daim hlau tau rhuab saum lawv qhov kub thiab txias thiab tom qab ntawd cua- txias raws li kev tswj xyuas. Cov txheej txheem no ua kom zoo dua cov ferrite-pearlite lossis bainitic microstructure, txo qis kev sib cais uas muaj nyob rau theem steelmaking, thiab txhim kho microstructural uniformity thoob plaws lub phaj tuab.
Cov txiaj ntsig tseem ceeb ntawm normalizing muaj xws li:
- Kev ua kom zoo dua qub -austenite grain loj
- Kev txo qis tom qab-rolling residual stresses
- Txhim kho cov kev cuam tshuam toughness thiab cov qauv stability
- Uniform mechanical zog ntawm qhov chaw thiab cov tub ntxhais ntawm cov phaj hnyav
Tempering txheej txheem
Ua raws li kev kho kom zoo, ASTM A387 Gr. 22 daim hlau raug tempering los kho hardness thiab optimize ductility. Cov txheej txheem tempering txhawb kev tsim kom ruaj khov, tempered microstructure, kom cov hlau tuav nws lub zog thaum lub sij hawm ntev - raug rau siab siab - qhov kub thiab txias ib puag ncig.
Tempering kev kho mob muab:
- Txhim kho ductility thiab toughness
- Relief of post-heat-kev kho mob residual stresses
- Txhim khu kev tiv thaiv mus ntev - lub sij hawm creep deformation
- Superior seem stability thaum fabrication thiab kev pab cuam
Weldability ntawm ASTM A387 Gr.22 alloy steel phaj
Thaum lub sij hawm tsim khoom, peb ua tib zoo tswj cov vuam tsis zoo- xws li qhov kub thiab txias, cua sov input, interpass kub, thiab tom qab-weld tshav kub kev kho mob (PWHT)-kom tiv thaiv hydrogen- pab tawg (HAC) thiab ntau hardening nyob rau hauv lub tshav kub- cuam tshuam cheeb tsam (HAZ).
Tej yam yuav tsum tau welding muaj xws li:
- Preheat kub: 150-250℃(nyob ntawm lub phaj thickness thiab vuam tej yam kev mob)
- Tswj cua sov input: Feem ntau khaws cia nyob rau hauv qhov ntau teev los ntawm qhov tsim nyog Welding Procedure Specification (WPS)
- Interpass kub tswj: Ua kom muaj kev ruaj ntseg microstructural hauv thaj tsam weld
- Ncej -weld kev kho cua sov (PWHT): Ua raws li cov thickness, kev pab cuam tej yam kev mob, thiab qhov project specifications los txo cov residual stresses thiab txhim kho toughness
Fabrication Peev xwm ntawm ASTM A387 Gr.22 alloy steel phaj
Ua ke nrog lub zog siab thiab zoo heev ductility, peb ASTM A387 Gr. 22 steel daim hlau tuaj yeem ua tiav los ntawm ntau yam kev tsim khoom, suav nrog:
- CNC txiav: Ua kom tiav phaj profileing thaum tuav nruj qhov ntev ntev
- Phaj dov: Muaj feem xyuam rau kev tsim cylindrical plhaub ntawm reactors, tshav kub exchangers, thiab siab hlab ntsha
- Kub sib sau: Tsim nyog rau cov khoom sib xyaw uas yuav tsum tau tswj kev ua kom sov
- Machining thiab ntug kev npaj: Muab lub ntsej muag vuam huv los ua kom zoo dua qub
Cov ntawv thov ntawm ASTM A387 Gr.22 alloy steel phaj
Petrochemical thiab Refining:Hydroprocessing reactors, siab -kub kub exchangers, separators, thiab spherical cia tanks
Lub zog thiab lub zog:Kev siv hluav taws xob boiler chav nruas thiab superheater / reheater headers
Cov Khoom Siv Hluav Taws Xob Nuclear:Reactor siab hlab ntsha (RPV) auxiliary Cheebtsam thiab evaporators
Kev Pabcuam:Qhov kub siab (350-566 degree) hauv kev pabcuam hydrogen thiab qaub (sulfide) corrosive ib puag ncig
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Rau cov neeg yuav khoom thoob ntiaj teb, xaiv tus neeg xa khoom zoo ASTM A387 Gr.22 yog qhov tseem ceeb raws li kev xaiv cov qib steel kom raug. GNEE Steel txhawb nqa cov neeg siv khoom thoob ntiaj teb nrog cov peev txheej ruaj khov, kev tswj xyuas nruj thiab kho cov hlau phaj kev daws teeb meem rau cov phiaj xwm siab.
FAQ
Q: A387 Gr.22 puas tuaj yeem khoov?
A: Yog, ASTM A387 Gr. 22 (ib chromium-molybdenum alloy siv feem ntau hauv cov hlab ntsha thiab boilers) tuaj yeem khoov tau, yog tias nws ua tiav siv cov txheej txheem raug rau qis- alloy steels.
Q: Puas yog A387 Gr.22 haum rau siab - qhov kub thiab txias?
A: Yog lawm, ASTM A387 Qib 22 yog qhov tsim nyog rau siab - qhov kub thiab txias. Nws yog ib qho tseem ceeb ntawm chromium-molybdenum (chrome-moly) alloy steel tshwj xeeb tsim los tswj qhov kub siab, ua rau nws yog cov khoom siv rau cov hlab ntsha siab thiab cov boilers.
Q: Dab tsi yog qhov corrosion kuj ntawm A387 Gr.22 steel phaj?
A: A387 Qib 22 (Chrome-Moly) steel phaj tso siab rau nws 2.25% chromium thiab 1.00% molybdenum muaj pes tsawg leeg. Nws muaj qhov nruab nrab kom zoo atmospheric thiab oxidation tsis kam, zoo tiv thaiv hydrogen nres, thiab ua tau zoo heev nyob rau hauv qaub roj ib puag ncig, tiv taus pitting thiab kev ntxhov siab tawg.
Q: Dab tsi yog qhov siab -kub tsis kam ntawm A387 Gr.22 steel phaj?
A: ASTM A387 Qib 22 (a chromium{2}}molybdenum alloy) steel phaj tswj kev ruaj ntseg thiab oxidation tsis kam ntawm qhov kub siab txog 600℃(1,112℃F). Nws lub siab ua haujlwm siab ntev thiab nkag siab ua rau nws yog qhov kev xaiv zoo tshaj plaws rau boilers thiab cov hlab ntsha siab hauv lub zog tsim hluav taws xob, roj, thiab kev lag luam roj.
