ASTM A179 npog dab tsi
ASTM A179, nrog nws cov ASME ntxaib SA-179, yog tus qauv tshwj xeeb rau seamless txias-kos qis- carbon steel hlab rau tubular heat exchangers, condensers, thiab cov khoom siv hluav taws xob zoo sib xws. Cov hlab yog nkag mus rau qhov tsawg kawg nkaus phab ntsa tuab, uas txhais tau hais tias cov phab ntsa tiag tiag yog qhov kev txiav txim yam tsawg kawg nkaus ntxiv rau qhov ua siab ntev. Tus qauv npog sab nraud ntawm 1/8 nti mus rau 3 ntiv tes, lossis 3.2 txog 76.2 hli. A179 raj yog dav siv hauv boilers, heaters, coolers, thiab condensers nyob rau hauv fais fab nroj tsuag, refineries, thiab cov txheej txheem cov nroj tsuag, qhov twg ib tug nyias, huv si, ductile raj nrog ib tug du bore yog xav tau rau kev hloov tshav kub.
Tshuaj muaj pes tsawg leeg
Cov hlau yog tsawg- carbon, qib tua tag nrho nrog cov kev txwv hauv qab no:
| Element | Kev xav tau,% |
|---|---|
| Cov pa roj carbon | 0.06 – 0.18 |
| Manganese | 0.27 – 0.63 |
| Phosphorus, max | 0.035 |
| Sulphur, max | 0.035 |
| Silicon, max | 0.25 |
Cov pa roj carbon tsawg thiab nruj impurity txwv muab lub raj nws cov ductility, weldability, thiab tsis kam tawg thaum ua haujlwm txias thiab kev pabcuam. Cov khoom siv yog ib txwm muab rau cov khoom siv tshuaj lom neeg thiab cov khoom siv ntawm tus qauv, nrog rau kev ntsuas cua sov qhia rau ntawm daim ntawv pov thawj.
Mechanical Properties
Yam tsawg kawg nkaus txhua yam khoom yuav tsum tau los ntawm A179 yog:
| Khoom | Kev xav tau |
|---|---|
| Tensile zog | 47 ksi / 325 MPa, min |
| Yield zog | 26 ksi / 180 MPa, min |
| Elongation hauv 50 mm | 35%, min |
| Hardness | 72 HWB, max |
Cov no yog qhov tsawg kawg nkaus qhov tseem ceeb rau cov raj tiav tom qab kev kho cua sov zaum kawg. Kev sib xyaw ua ke ntawm lub zog nruab nrab thiab siab elongation ua rau lub raj tsim nyog rau dov thiab vuam rau hauv cov nplooj ntawv raj, rau kev khoov, thiab rau kev pab cuam qhov twg thermal expansion yuav tsum haum tsis muaj cracking.
Kev tsim khoom thiab kev kho cua sov
A179 raj yog tsim seamless los ntawm kub tho thiab txias - kos rau qhov kawg qhov ntev. Kev kos duab txias ua rau muaj kev tiv thaiv nruj, du nto, thiab cov phab ntsa nyias uas yuav tsum tau ua rau cua sov- hloov kev pabcuam. Tom qab qhov kawg txias txias-kos dhau, lub raj yog cua sov-kho ntawm qhov kub ntawm 1200 F (650 C) lossis siab dua kom rov ua kom cov ductility thiab tshem tawm cov teebmeem ntawm kev ua haujlwm txias. Lub raj tiav tsis muaj nplai, tsuas yog me ntsis ntawm oxidation tso cai, thiab saum npoo yog tiv thaiv thaum xa khoom los ntawm cov kua roj vanish lossis lub teeb roj txheej raws li tau pom zoo.
Yuav tsum tau xeem
Txhua lub raj yog ua raws li cov kev sim tshuab ntawm tus qauv: flattening, flaring, flange, hardness, thiab hydrostatic tests, nrog rau tsis yog -kev kuaj kev puas tsuaj muaj nyob rau lwm txoj hauv kev kuaj hydrostatic thaum pom zoo. Cov kev ntsuam xyuas flattening thiab flaring paub tseeb tias lub raj tuaj yeem ua haujlwm yam tsis muaj kev tawg, uas yog qhov tseem ceeb rau dov rau hauv cov ntawv raj. Daim ntawv pov thawj zeb xeem tau muab rau EN 10204 3.1 raws li tus qauv, nrog 3.2 ntawv pov thawj muaj los ntawm lub koom haum tshuaj xyuas ywj pheej.
A179 vs Lwm Tube Specifications
A179 yog ib qho txias -kos qis- cov pa roj carbon raj rau cua sov- cov cuab yeej hloov pauv ntawm qhov qis thiab nruab nrab thiab qhov kub thiab txias. A106 Qib B yog qhov kub - tiav seamless yeeb nkab rau siab dua - kev pabcuam siab nrog cov phab ntsa tuab thiab muaj zog dua; A179 tsis yog qhov hloov pauv rau A106 qhov chaw siab thiab qhov kub thiab txias yog qhov kev tswj hwm. Rau nruab nrab cua sov-txoj haujlwm sib pauv, A179 feem ntau tuaj yeem hloov A106B nyob rau hauv qhov kev txwv tsim ntawm kev sib pauv, tab sis kev hloov pauv yuav tsum tau lees paub los ntawm tus kws tsim qauv tsim tawm tsam kev ua haujlwm.
Cov lus nug nquag
Q: Qhov txawv ntawm A179 thiab A106 Qib B yog dab tsi?
A179 yog qhov txias txias -kho qis- cov pa roj carbon raj rau cov khoom siv hluav taws xob sib txawv thiab cov condensers ntawm qhov qis thiab nruab nrab siab thiab kub. A106 Qib B yog qhov kub - tiav seamless yeeb nkab rau dav dav - kev pabcuam siab nrog lub zog siab dua thiab cov phab ntsa tuab.
Q: Qhov luaj li cas A179 npog?
Sab nraud diameters los ntawm 1/8 nti mus rau 3 nti, los yog 3.2 mus rau 76.2 hli, nrog rau phab ntsa thickness nkag mus rau qhov tsawg kawg nkaus - phab ntsa.
Q: Lub zog tensile ntawm A179 raj yog dab tsi?
Lub zog tensile yam tsawg kawg nkaus yog 47 ksi (325 MPa), qhov tsawg kawg nkaus yield zog yog 26 ksi (180 MPa), thiab qhov tsawg kawg nkaus elongation nyob rau hauv 50 hli yog 35%.
Q: A179 tube ua li cas?
Seamless hot thom khwm ua raws li kev kos duab txias, nrog kev kho cua sov zaum kawg ntawm 1200 F lossis siab dua tom qab txias kawg - kos dhau.
Q: Yuav tsum tau xeem dab tsi?
Flattening, flaring, flange, hardness, thiab hydrostatic tests, nrog rau tsis yog -kev kuaj kev puas tsuaj raws li ib qho kev pom zoo rau kev sim siab.
Q: A179 puas tuaj yeem welded?
Yog lawm. Qhov qis-carbon muaj pes tsawg leeg ua rau cov hlab tau yooj yim weldable rau cov nplooj ntawv raj thiab headers, nrog cov txheej txheem TIG los yog orbital cov txheej txheem siv nyob rau hauv exchanger fabrication.
