Vim li cas C12200 U-Bend Tube siv
Plhaub-thiab-tube heat exchangers yuav tsum tau khoov ntawm qhov kawg ntawm txhua lub raj ua kom lub coolant tuaj yeem thim rov qab yam tsis muaj qhov txuas ntxiv. ASTM B111/B111M npog cov tsim U- khoov raws li ib feem ntawm lub raj specification, thiab UNS C 12200 - hu ua DHP, los yog deoxidised siab phosphorus tooj liab - yog cov khoom siv ua haujlwm rau lub luag haujlwm.
C12200 muaj 99.90 feem pua tsawg kawg tooj liab, suav nrog nyiaj, thiab 0.015 txog 0.040 feem pua phosphorus. Cov phosphorus deoxidises cov yaj, tshem tawm cov pa oxygen uas yuav ua rau hydrogen embrittlement, yog li cov hlau tuaj yeem welded thiab brazed ntseeg tau. Nws kuj txhawb nqa qhov loj me me thiab nce qhov kub ntawm kev ua haujlwm- cov khoom siv tawv, uas pab lub raj tuav nws cov duab tom qab khoov.
Chemical Composition thiab Mechanical Requirements
| Element | C12200 xav tau |
|---|---|
| Tooj (Cu), suav nrog nyiaj | 99.90% tsawg kawg nkaus |
| Phosphorus (P) | 0.015 - 0.040 % |
| Tag nrho lwm yam | 0.05% siab tshaj |
| Cov khoom txheem | ASTM B111 / B111M, ASME SB111 |
| European equivalent npe | Cu-DHP, seamless raj rau EN 12451 |
| Japanese sib npaug | C1220T to JIS H3300 |
Nyob rau hauv lub annealed mob C12200 raj yog teev nyob rau hauv qhov tsawg kawg nkaus tensile lub zog ntawm 207 MPa (30 ksi) nrog yam tsawg kawg nkaus elongation ntawm 35 feem pua, thiab siab tshaj plaws hardness nyob rau hauv lub mos temper yog hais txog 50 HV. Kos tempers tsa lub zog tensile yam tsawg kawg nkaus mus rau ib ncig ntawm 250 MPa rau lub teeb-kos raj thiab 310 MPa rau nyuaj-kho raj, nrog yield zog ntawm txog 205 MPa thiab 275 MPa feem.
Lub cev thiab Corrosion Properties
| Khoom | Yam nqi |
|---|---|
| Qhov ntom | 8.90 g / cm³ ntawm 20 degree |
| Melting point | 1083 degree |
| Coefficient ntawm thermal expansion | 17.7 x 10^-6 per℃(20-300 degree) |
| Thermal conductivity | 290-365 W / (m·K) ntawm 20 degree |
| Tshwj xeeb kub | 385 J / (kg·K) ntawm 20 degree |
| Hluav taws xob conductivity | 70-90% IACS, nyob ntawm qhov kub thiab txias |
| Modulus ntawm elasticity | 115 GPa |
| Poisson tus piv | 0.33 |
Corrosion cwj pwm zoo ib yam li high -conductivity tooj liab: zoo heev huab cua tsis kam, zoo heev tiv taus ntau yam tshuaj, thiab zoo tiv thaiv pitting thiab impingement nres nyob rau hauv tej yam ntuj tso dej. C12200 resists tsis yog -oxidising ntxhia thiab organic acids, alkaline daws thiab ntsev ntsev, thiab vim nws tiv thaiv av corrosion nws yuav siv tau rau faus pipework. Nws tsis yog tsim los siv nrog oxidising acids, ammonia- bearing condensates los yog siab -ceev aerated seawater yam tsis muaj kev pom zoo tiv thaiv txoj cai.
Fabrication thiab Joining Sequence
Khoov: raj yog khoov rau ntawm lub mandrel nyob rau hauv lub mos annealed temper, nrog khoov vojvoog, ovality thiab phab ntsa thinning tswj kom pom zoo txwv.
Annealing: tag nrho cov anneal ntawm 250℃thiab 650℃rov qab ductility tom qab ua haujlwm txias; Kev ntxhov siab nyem ntawm 200℃mus rau 250℃stabilizes qhov khoov.
Tube- daim ntawv sib koom ua ke: nthuav dav, dov los yog hydraulic expansion ua raws li kev sib khi vuam qhov twg tus tsim yuav tsum tau.
Soldering thiab brazing: ob qho tib si tus nqi zoo heev, uas yog qhov laj thawj tseem ceeb ntawm qib no dominates exchanger fabrication.
Vuam: roj shielded arc vuam tus nqi zoo, thiab cov ntsiab lus phosphorus ua rau cov hlau ua haujlwm ntev ntawm kev ua haujlwm ib txwm muaj.
Cov ntsiab lus tshuaj xyuas rau U-Bend Bundles
Txheeb xyuas qhov khoov vojvoog, ceg ntev ntev thiab khoov dav hlau sib dhos, txij li cov kev tswj xyuas seb lub pob yuav nkag mus rau hauv lub plhaub.
Tshawb xyuas phab ntsa tuab ntawm sab nraud ntawm qhov khoov los ntawm kev ntsuas ultrasonic; thinning tshaj qhov pom zoo txwv txo qhov ntsuas siab.
Yuav tsum muaj qhov seem - kev ntsuas kev ntxhov siab ntawm txoj hlua ncaj nraim ua ntej khoov, thiab eddy - kev sim tam sim no tom qab khoov qhov twg tau teev tseg.
Paub meej tias qhov kev kho cua sov: ib feem ntawm qhov annealed khoov yuav tawg thaum lub sij hawm nthuav mus rau hauv cov ntawv raj.
FAQ
Q: Lub npe DHP txhais li cas?
DHP sawv cev rau deoxidised siab phosphorus. Nws piav txog tooj liab xws li UNS C12200 uas yog deoxidised nrog 0.015 rau 0.040 feem pua phosphorus kom nws tuaj yeem welded thiab brazed yam tsis muaj hydrogen embrittlement.
Q: Vim li cas lub raj xa khoom annealed?
Cov mos mos annealed temper muab cov ductility xav tau los ua U- khoov thiab nthuav lub raj xaus rau hauv daim ntawv raj yam tsis muaj tawg. Cov tempers nyuaj yog siv rau kev khiav ncaj nraim qhov twg muaj teeb meem nruj.
Q: Ntau npaum li cas phosphorus txo conductivity?
Qhov tseem ceeb. Cov hluav taws xob conductivity ntawm C12200 poob rau hauv 70-90 feem pua IACS band ntau dua li 101 feem pua IACS ntawm cov qib tsis muaj pa oxygen, uas yog vim li cas C12200 raug xaiv rau lub zog, weldability thiab corrosion ua haujlwm ntau dua li qhov siab tshaj plaws conductivity.
Q: Koj puas tuaj yeem- khoov tuaj yeem muaj qhov sib npaug lossis tsis sib npaug?
Yog lawm. Cov ceg ntev, khoov vojvoog thiab khoov dav hlau orientation yog ua rau tus neeg siv khoom lub nras kos duab, thiab txhua qhov khoov raug tshuaj xyuas cov qhov ntev ua ntej ntim.
Q: Qhov kev ntsuam xyuas twg siv rau cov raj no?
Expansion, flattening, residual stress, grain loj, eddy tam sim no thiab kev ntsuam xyuas hydrostatic los yog pneumatic siab yog cov li ib txwm, raws li qhov yuav tsum tau ntawm ASTM B111 thiab cov neeg yuav khoom specification.
Q: Yuav ua li cas U{0}} khoov rau ntawm qhov chaw?
Txhawb qhov khoov, tsis txhob ob txhais ceg, thiab ua kom qhov khoov cheeb tsam tsis muaj kev cuam tshuam cov cim thiab kev puas tsuaj. Khaws hauv tsev thiab khaws cov raj kom qhuav kom txog thaum kev teeb tsa kom tsis txhob muaj qhov staining.
