Puas yog C70600 raj xav tau kev kho cua sov tom qab vuam?
Tsis muaj.ASTM B111 C70600 Cov Lus Qhiatsis xav tau tom qab-weld kev kho cua sov.
Tsis zoo li cov pa roj carbon steel lossis qee cov hlau tsis muaj hlau, C70600 tooj liab nickel raj khaws nws cov corrosion kuj thiab cov khoom siv kho tshuab raws li -welded condition. Tom qab-weld kev kho cua sov tuaj yeem ua rau cov qoob loo loj hlob thiab txo lub zog.
Tab sis muaj ib qho kev zam: Yog tias lub raj txias ua haujlwm hnyav (ntau dua 30% txo) thiab tom qab ntawd welded, kev ntxhov siab annealing ntawm 300-400℃rau 30 feeb yuav tau txais txiaj ntsig.
| Qhov xwm txheej | Kev kho cua sov xav tau? |
|---|---|
| Raws li -welded, lub teeb txias ua haujlwm | Tsis muaj |
| As-welded, heavy cold work (>30%) | Optional stress nyem |
| Annealed raj (O60) ua ntej vuam | Tsis muaj |
| Hard drawn tube ua ntej welding | Tsis yog - tab sis tsis pom zoo kom weld nyuaj kos |
| U- khoov txoj kev | Kev ntxhov siab tau pom zoo tom qab khoov |
Dab tsi yog tus qauv annealing kub rau C70600?
Tag nrho annealing: 650-750 degree, ua raws li cua txias hauv huab cua lossis dej.
Annealing restores softness thiab ductility tom qab kos duab txias. Lub voj voog annealing tiav:
| Kauj ruam | Kub | Sijhawm | Txoj kev txias |
|---|---|---|---|
| Kub rau | 650-750 degree | 30-60 feeb ib 25mm thickness | - |
| Soak | Tuav ntawm qhov kub thiab txias | 30-60 feeb | - |
| Txias | Hauv qab 300 degree | Raws li xav tau | Cua los yog dej quench |
Yuav ua li cas annealing ua:
Tshem tawm kev ntxhov siab sab hauv los ntawm kev kos duab txias
Restores ductility rau khoov thiab nthuav
Recrystallizes cov qauv nplej
Tsis hloov corrosion kuj
Dab tsi annealing tsis ua:
Tsis tshem tawm oxide nto (pickling yog cais)
Tsis hloov tshuaj muaj pes tsawg leeg
Tsis txhim kho cov khoom tsis zoo
Dab tsi yog qhov kev ntxhov siab rau kev ntxhov siab rau C70600?
Kev ntxhov siab: 300-400℃rau 30-60 feeb, ces cua txias.
Kev ntxhov siab yog siv tom qab khoov txias (U- khoov) lossis ua haujlwm txias. Nws txo cov kev ntxhov siab uas tsis muaj qhov muag muag tag nrho.
| Daim ntawv thov | Kub | Sijhawm | Kev tshwm sim |
|---|---|---|---|
| Tom qab U- khoov | 300-400 degree | 30 feeb | Txo lub caij nplooj ntoos hlav- rov qab |
| Tom qab lub teeb nthuav dav | 350 degree | 30 feeb | Tiv thaiv ncua kev tawg |
| Tom qab hnyav vuam | 400 degree | 60 feeb | Stabilizes microstructure |
Thaum twg los siv kev ntxhov siab:
U-bent heat exchanger tubes
Cov raj uas yuav vibrated hauv kev pabcuam (compressor coolers)
Tom qab kho vuam ntawm cov tshuab uas twb muaj lawm
Thaum twg los hla kev ntxhov siab:
Ncaj raj rau kev pabcuam
Tubes nrog lub teeb khoov (lub vojvoog> 5 x OD)
Cov phab ntsa nyias nyias (hauv qab 1.0mm) - kev pheej hmoo ntawm kev cuam tshuam
Yuav ua li cas yog C70600 tube yog overheated?
Kev kub siab tshaj 800℃ua rau cov qoob loo loj hlob thiab tsis muaj zog.
| Kub | nyhuv |
|---|---|
| 750 degree | Ib txwm annealing - tau |
| 800 degree | Cov qoob loo loj hlob pib |
| 850 degree | Kev loj hlob ntau dhau - txo lub zog |
| 900 degree | Deg oxidation, muaj peev xwm tawg |
| Tshaj 950 degree | Melting pib (solidus kub ~ 1080 degree) |
Cov cim qhia ntawm overheating:
Tube ua nkig (tsis khoov kuaj)
Nto nplai yog tuab thiab dub
Cov qauv nplej pom ntawm qhov muag liab qab tom qab etching
Txo lub zog tensile qis dua 310 MPa
Yuav ua li cas kom tsis txhob overheating:
Siv cov cua sov tswj cua sov nrog cov thermocouples
Tsis txhob siv cov nplaim taws rau annealing
Saib xyuas qhov kub thiab txias txhua 15 feeb
Tsis txhob tshaj 750℃rau tag nrho annealing
Kev kho cua sov cuam tshuam li cas rau cov khoom siv kho tshuab?
| Qhov xwm txheej | Tensile zog (MPa) | Yield zog (MPa) | Elongation (%) | Hardness (HRB) |
|---|---|---|---|---|
| Cov khoom siv (H80) | 400–550 | 350–450 | 8–15 | 80–95 |
| Txo kev ntxhov siab | 350–450 | 250–350 | 15–25 | 65–80 |
| Annealed (O60) - tus qauv | 310–380 | 105–150 | 30–45 | 40–65 |
| Over-annealed (>800 degree) | Hauv qab no 310 | Hauv qab 100 | 45–60 | Hauv qab no 40 |
Txuj kev xa khoom rau ASTM B111: Annealed (O60) tshwj tsis yog hais tias lwm yam.
Rau tshav kub exchanger raj:
Siv annealed (O60) rau dov rau hauv cov ntawv raj
Siv cov kev ntxhov siab rau U- khoov pob
Tsis txhob siv lub zog kos - yuav tawg thaum nthuav dav
Dab tsi yog qhov kev kho cua sov ntau yam hauv C70600 raj?
| Tsis zoo | Ua rau | Yuav kuaj li cas |
|---|---|---|
| Tsis tiav annealing | Kub qis dhau los yog lub sijhawm luv dhau | Hardness saum 65 HRB, qis elongation |
| Tshaj -ntiv nplhaib | Kub kub siab tshaj 800 degree | Cov qoob loo loj hlob pom nyob rau hauv microscope |
| Nto oxidation | Tsis muaj kev tiv thaiv huab cua | Dub los yog xim av scale |
| Decarburization | Lub sijhawm ntev ntawm qhov kub thiab txias | Mos nto, hardness gradient |
| Thermal tawg | Kev txias txias ntawm phab ntsa tuab | Cracks pom los ntawm dye penetrant |
| Cov khoom tsis sib xws | Tsis yog- cua sov | Hardness txawv nyob ib ncig ntawm |
Kev lees paub rau cov raj annealed:
Hardness: 40-65 HRB
Elongation: yam tsawg kawg 30%
Grain loj: ASTM 0.015-0.045mm nruab nrab
Nto: huv si, tsis muaj qhov hnyav
Yuav ua li cas qhia txog kev kho cua sov hauv koj daim ntawv xaj khoom?
Ib txwm sau tus npau taws kom meej.
Cov lus piav qhia txog kev yuav khoom:
Tube rau ASTM B111, alloy C70600, seamless, annealed (O60 temper). Tag nrho annealing ntawm 650-750℃nyob rau hauv tswj cua kub cua sov. Mill daim ntawv pov thawj kom paub meej tias npau taws thiab txhua yam khoom raws li ASTM B111.
Temper codes rau C70600:
| Temper code | Kev piav qhia | Thaum siv |
|---|---|---|
| O60 | Mos annealed | Txheem rau feem ntau daim ntawv thov |
| O61 | Txo kev ntxhov siab | Tom qab txias txias |
| O30 | Maj mam txias | Thaum xav tau ntau zog |
| H80 | Nyuaj kos | Tsis yog rau tshav kub exchangers |
Yog tias koj xav tau kev ntxhov siab tom qab U- khoov:
* Tom qab U- khoov, cov hlab ntsha yuav tsum tau txo qis ntawm 300-400℃rau 30 feeb yam tsawg kawg nkaus. Tsis muaj scaling lossis oxidation raug tso cai.*
FAQ
Dab tsi yog qhov txawv ntawm annealing thiab kev ntxhov siab nyem rau C70600?
Annealing yog ua tiav ntawm 650-750℃thiab softens lub raj nrog recrystallized grain qauv. Kev ntxhov siab yog ua tiav ntawm 300-400℃thiab txo cov kev ntxhov siab uas tsis tau hloov pauv cov qauv los yog cov tawv tawv heev.
Kuv puas tuaj yeem muab lub raj C70600 rau hauv qhov chaw ua haujlwm nrog lub teeb?
Tsis yog. Torch cua kub tsis sib npaug thiab yuav ua rau muaj cua sov hauv cheeb tsam. Annealing yuav tsum tau tswj qhov cua sov. Rau kev ua haujlwm hauv thaj chaw, siv kev ntxhov siab ntawm qhov kub qis dua yog tias tsim nyog, lossis yuav cov raj ua ntej -annealed.
Puas yog kev kho cua sov puas cuam tshuam rau kev tiv thaiv corrosion ntawm C70600?
Tsis yog. Corrosion tsis kam ntawm C70600 los ntawm nws cov tshuaj muaj pes tsawg leeg (9-11% nickel, 1.0-1.8% hlau), tsis yog los ntawm kev kho cua sov. Annealed, kev ntxhov siab, thiab cov tub yees txias tag nrho muaj cov dej hiav txwv zoo sib xws.
Vim li cas qee tus neeg xa khoom xa khoom C70600 nyob rau hauv qhov teeb meem nyuaj es tsis txhob annealed?
Hard drawn tubes yog pheej yig dua los tsim vim annealing yog hla. Qee tus neeg muag khoom ua qhov no los txiav cov nqi. Txawm li cas los xij, cov hlab ntsha tawv tawv tawg thaum lub sijhawm nthuav dav thiab yuav tsum tsis lees txais. Ib txwm xav tau O60 annealed temper.
Yuav ua li cas los xyuas seb lub raj puas yog annealed zoo yam tsis muaj chav kuaj?
Ua ib qho kev sim khoov. Txiav ib 150mm qauv. Khoov nws 90 degrees nyob ib ncig ntawm lub mandrel nrog txoj kab uas hla 2x raj OD. Annealed raj khoov tsis muaj cracking. Hard drawn tube tawg los yog qhia cov kua muag nto.
Dab tsi yog txoj kev txias tom qab C70600 annealing - dej lossis cua?
Ob leeg tau txais. Dej quenching muab me ntsis zog dua. Cua txias yog qeeb qeeb thiab muab qhov siab tshaj plaws ductility. Rau ntau daim ntawv thov, ob txoj kev yog qhov zoo. Tus qauv tsis qhia txog txoj kev ua kom txias.
Kuv tuaj yeem siv lub tshuab nqus tsev rau C70600 annealing?
Yog lawm, lub tshuab nqus tsev vacuum yog qhov zoo heev vim nws tiv thaiv oxidation nto. Yog tias siv lub tshuab nqus tsev, tuav qhov kub ntawm 650-700℃rau 30-60 feeb. Txias hauv lub tshuab nqus tsev los yog nrog cov roj inert backfill.
Puas yog C70600 ua haujlwm tawv thaum lub caij txias?
Yog, tseem ceeb heev. Kev kos duab txias txo qhov hla ntawm 30-70% thiab nce tensile zog ntawm 310 MPa rau 450-550 MPa. Elongation poob los ntawm 30-45% mus rau 8-15%. Annealing yuav tsum tau rov qab ductility.
Qhov loj npaum li cas yog ib txwm rau annealed C70600 raj?
Qhov nruab nrab ntawm cov qoob loo ntawm 0.015-0.045mm (ASTM grain loj 9-6). Cov nplej zoo muab lub zog zoo dua. Coarse nplej muab zoo dua creep kuj nyob rau hauv high kub. Rau feem ntau cov kev pab cuam tshav kub exchanger, nruab nrab grain (0.025mm) yog qhov zoo tshaj plaws.
Muaj pes tsawg zaus C70600 tuaj yeem rov ua dua -annealed?
Ntau zaus. C70600 tsis poob nws lub peev xwm yuav tsum tau annealed txawm tias tom qab ntau lub voj voog. Txawm li cas los xij, rov ua cua sov ua rau saum npoo oxidation thiab maj mam coarsening. Nyob rau hauv kev xyaum, 2–3 re-annealing cycles yog txais.
Cov kev sim
Eddy tam sim no xeem (ECT) rau ASTM E243
Hydrostatic xeem mus txog 20 MPa
PMI (XRF) rau kev txheeb xyuas alloy ntawm txhua qhov cua sov
Mechanical Properties Test (tensile, hardness, flattening, expansion)
Microscopic kuaj rau grain qauv
Flattening xeem rau ASTM B111
Rov qab flattening xeem rau welded raj (qhov twg muaj feem xyuam)
Kev ntsuas qhov loj ntawm ASTM E112
Ntim cov qauv
Yas kawg lub kaus mom ntawm ob qhov kawg kom tiv thaiv kev sib kis
Ib tug neeg polybag wrapping rau txhua lub raj
Ntoo crates lossis steel spools rau export
Cov dej noo-cov ntaub ntawv pov thawj thiab cov khoom desiccant rau kev xa khoom hauv hiav txwv
Sau npe nrog tus lej xov tooj cua sov, qhov loj me, npau taws, thiab kom muaj nuj nqis ntawm txhua pob
Xim -coded bands rau temper identification (ntsuab rau annealed)
Anti- ntawv xeb ntawm cov txheej raj
Cov khoom siv ntau lawm
Extrusion xovxwm (1500T thiab 2500T)
Cov tshuab kos duab txias (10 kab, OD ntau 4mm txog 90mm)
Annealing furnaces (tswj cua sov, 650-750 degree, 3 units)
Straightening thiab txiav kab
U-bending tshuab rau cua sov exchanger raj
Eddy tam sim no kuaj tshuab (3 units)
PMI phom rau hauv - txheej txheem kev txheeb xyuas cov hlau
Hardness tester (Rockwell thiab Vickers)
Peb cov khoom siv tooj liab
| Yam khoom | Cov alloys | Qhov ntau thiab tsawg |
|---|---|---|
| Tube (seamless) | C10100, C10200, C12200, C70600, C71500, C44300, C68700 | OD 4mm-90mm, WT 0.3mm-5.0mm |
| Tube (seamless) | C12200, C70600, C71500 | OD 10mm-108mm, WT 1.0mm-8.0mm |
| Qws / bar (round, hex, square) | C10100, C10200, C11000, C36000, C46400, C63000 | Dia 3mm-100mm |
| Hlau | C10100, C10200, C11000, C16200, C19400 | Dia 0.1mm-8.0mm |
| Sawb / coil | C10100, C10200, C11000, C19400, C26000, C26800, C52100 | Thk 0.1mm-3.0mm, dav mus txog 400mm |
| Phaj / ntawv | C10100, C10200, C11000, C12200, C70600, C71500, C46400 | Thk 0.5mm-50mm, dav mus txog 1000mm |
