Scope ntawm ASTM A179
ASTM A179/A179M yog tus qauv specification rau seamless txias-tso qis- carbon steel tshav kub exchanger thiab condenser raj. Nws npog cov hlab nrog sab nraud txoj kab uas hla los ntawm 3.2 hli mus rau 76.2 hli, muab nyob rau hauv ntev ntev los yog raws li U-khoov hlab, thiab nws yog xaiv nyob qhov twg ib tug tsawg - carbon tube nrog zoo formability thiab cia siab rau thermal ua tau zoo. Cov ntaub ntawv tau sau raws li cov khoom tshwj xeeb, yog li cov kev cai dav dav rau kev xa khoom, kev ua siab ntev, kev ntsuas thiab kev ntsuas tau raug coj los ntawm ASTM A450 / A450M rau cov pa roj carbon thiab qis- alloy steel hlab thiab, hauv kev xyaum ntsuas, los ntawm cov qauv kev xav tau dav dav. Kev txiav txim tiav yog li yuav tsum tau hais txog ob qho tib si cov khoom specification thiab cov kev xav tau dav dav.
Tshuaj muaj pes tsawg leeg
Cov feem pua ntawm cov huab hwm coj, cua sov thiab cov khoom tsom xam.
| Element | Kev xav tau |
|---|---|
| Cov pa roj carbon | 0.06-0.18 Nws |
| Manganese | 0.27-0.63 Nws |
| Phosphorus | 0.035 hli |
| Sulfur | 0.035 hli |
Qhov nqaim carbon ntau yog txhob txwm tshaj tawm. Cov kev txwv qis tiv thaiv cov hlau mos dhau los tuav lub ntsej muag tiav tom qab dov thiab nthuav dav, thaum lub sij hawm sab sauv ua rau cov khoom siv tau yooj yim txias drawable thiab weldable yam tsis tsim cov hardness ntau dhau rau hauv lub raj tiav. Cov manganese ntau yam khoom siv lub zog xav tau yam tsis muaj kev cuam tshuam ductility, yog li lub raj tuaj yeem nthuav dav rau hauv cov ntawv raj lossis dov rau hauv lub raj - mus rau -tubesheet sib koom ua ke yam tsis muaj kev tawg.
Mechanical Properties thiab Kev kho cua sov
| Khoom | Kev xav tau |
|---|---|
| Tensile zog | 325 MPa (47 000 psi) yam tsawg kawg nkaus |
| Yield zog | 180 MPa (26 000 psi) yam tsawg kawg nkaus |
| Elongation | 35% yam tsawg kawg nkaus hauv 50 mm |
| Hardness | 72 HRB Max |
| Kev kho cua sov | Tom qab qhov kawg txias txias - kos duab dhau, kho ntawm 650 ° C lossis siab dua |
Qhov yuav tsum tau tshaj tawm - kos duab kho cua sov tsis yog ib qho kev kho kom zoo rau cov nplej. Nws lub hom phiaj yog txhawm rau txo qhov ua haujlwm txias tau qhia los ntawm qhov kawg ntawm daim duab dhau los, rov qab elongation thiab nqa lub raj hauv qhov txwv hardness. Cov raj uas khoov tom qab xa khoom, xws li U- khoov rau hauv cov khoom siv hluav taws xob sib hloov, yog khoov rau hauv qhov mob annealed thiab kev ntxhov siab tom qab tom qab qhov kev thov xav tau.
Kev kuaj, qhov ntev thiab kev xa khoom
Txhua qhov ntau yuav raug kuaj nruj, ntsuas kev sib tw thiab ntsuas qhov tawv, thiab cov hlab yog kuaj hydrostatically lossis kuaj xyuas los ntawm kev ntsuas hluav taws xob tsis zoo xws li kev tshuaj ntsuam xyuas tam sim no, raws li tau pom zoo hauv kev txiav txim. Dimensions, phab ntsa thickness tolerances, ntev tolerances, ncaj thiab deg mob yog tswj los ntawm qhov yuav tsum tau specification, thiab cov nto yog ib txwm muab nkag huv si thiab dawb ntawm teev. Tubes raug txiav txim los ntawm sab nraud txoj kab uas hla thiab qhov tsawg kawg nkaus phab ntsa thickness, nrog rau cov phab ntsa kam rau ua rau qhov tsawg kawg nkaus phab ntsa tshwj tsis yog ib tug nruab nrab phab ntsa yog teev.
Feem ntau ua tiav: raws li -kos pickled, los yog ci ntsa iab annealed qhov chaw paug ntawm cov txheej txheem kua yuav tsum zam
Ncaj ntev lossis U- khoov, nrog lub vojvoog khoov thiab ceg ntev tau teev nyob rau ntawm qhov kev txiav txim
Kos, bundling thiab tiv thaiv kawg lub kaus mom tswj hwm los ntawm cov qauv kev cai dav dav
Cov ntawv tshaj tawm xeem thiab ib qho thib peb - kev tshuaj xyuas thib peb tau hais ua ntej lub tshav kub dov
Kev sib piv nrog Cov Qib Kawm
ASTM A179 yog qib qis zog dua li ASTM A106 / A106M Qib B, uas muaj lub zog tensile yam tsawg kawg nkaus ntawm 415 MPa thiab qhov tsawg kawg nkaus lub zog ntawm 240 MPa thiab yog siv rau cov kav dej siab dua li qhov chaw hloov hluav taws xob. Cov ntsiab lus tsis tshua muaj carbon thiab mos ntawm A179 ua rau nws yooj yim rau khoov, nthuav dav rau hauv cov ntawv raj thiab yob rau hauv lub raj - mus rau -tubesheet sib koom, thiab nws cov thermal conductivity tsis txo los ntawm kev sib ntxiv alloying. Yog xav tau lub zog kub dua, qhov qis- qib alloy xws li ASTM A213 T11 lossis T22 raug xaiv, thiab qhov twg lub raj welded tau txais ib qho hluav taws xob tiv thaiv welded heat exchanger tube specification, xws li ASME SA214, yog siv. Cov kev xaiv ntawm cov kev xaiv no ua raws li los ntawm kev tsim hlau kub, lub raj sab dej chemistry thiab lub raj - mus rau -tubesheet kev sib koom ua ke.
FAQ
Q: ASTM A179 raj siv rau dab tsi?
Nws yog siv rau cov raj kub exchanger, condenser raj, feedwater rhaub raj thiab zoo xws li cov tshav kub hloov chaw, feem ntau nyob rau hauv cov tshuaj, petrochemical thiab fais fab kev lag luam qhov twg ib tug tsawg - carbon, yooj yim tsim raj yog yuav tsum tau.
Q: Qhov txawv ntawm ASTM A179 thiab ASTM A106 Qib B yog dab tsi?
A179 yog lub tshav kub exchanger tube specification nrog qhov tsawg kawg nkaus tensile zog ntawm 325 MPa thiab qhov tsawg kawg nkaus yield zog ntawm 180 MPa, thaum A106 Qib B yog lub siab yeeb nkab specification nrog yam tsawg kawg nkaus tus nqi ntawm 415 MPa thiab 240 MPa. A179 yog tsim los ntawm kev kos txias thiab cua sov kho rau kev tsim, thiab A106 yog tsim los ntawm kub tiav los yog txias kos rau lub siab ntim.
Q: Vim li cas A179 tube yuav tsum tau kho cua sov tom qab kos duab txias kawg?
Qhov kawg txias -daim ntawv hla nce lub zog thiab txo qis ductility. Kev kho mob ntawm 650 ° C lossis siab dua txo qhov ua haujlwm txias, rov ua kom elongation thiab nqa cov raj hauv 72 HRB hardness txwv kom nws tuaj yeem dov, khoov thiab nthuav dav.
Q: Puas yog qhov ntsuas hydrostatic ib txwm xav tau?
Cov kev qhia tshwj xeeb tso cai rau ib qho kev sim hydrostatic los yog kev ntsuas hluav taws xob tsis zoo xws li kev tshuaj ntsuam xyuas tam sim no, nyob ntawm qhov kev txiav txim, yog li kev xaiv yuav tsum tau hais thaum lub raj raug txiav txim.
Q: Dab tsi yog qhov siab tshaj plaws hardness pub?
72 PAB. Qhov kev txwv no yog ib qho ntawm cov kev lees paub ntawm cov kev qhia tshwj xeeb thiab raug kuaj xyuas ntawm lub raj tiav tom qab kev kho cua sov.
Q: Qhov luaj li cas yog muaj?
Sab nraud diameters ntawm 3.2 hli mus rau 76.2 hli, nrog phab ntsa thickness, ntev thiab kam rau ua raws li cov kev cai dav dav specification hais nyob rau hauv qhov kev txiav txim.
Q: Lub raj A179 puas tuaj yeem muab tau raws li U- pob khoom khoov?
Yog lawm. U-bent hlab yog tsim los ntawm annealed ncaj raj, thiab khoov vojvoog, ceg ntev thiab ib qho ncej- khoov kev ntxhov siab yuav tsum tau teev nyob rau hauv kev txiav txim nrog rau cov kev cai dav dav.