Hauv kev tsim cov yeeb nkab, ntau yam qauv thiab cov lus qhia tshwj xeeb yuav tsum tau ua raws li kev ua kom zoo thiab kev nyab xeeb ntawm cov khoom kawg.ASTM A139 Cov khoom lag luamyog ib qho qauv zoo li no uas ua lub luag haujlwm tseem ceeb hauv kev tsim cov yeeb nkab steel rau ntau yam kev siv.
ASTM A139 yog tus qauv specification rau electrofusion (arc) welded steel yeeb nkab (NPS 4 thiab siab dua).Nws npog cov kev cai rau kauv seam electrofusion (arc) welded, nyias phab ntsa, austenitic steel yeeb nkab rau corrosive los yog kub kub daim ntaub ntawv.Cov qauv no qhia txog qhov yuav tsum tau ua rau cov khoom siv, kev tsim khoom, qhov ntev thiab cov khoom siv ntawm cov kav hlau.
Cov khoom siv ntawm ASTM A139 qhia cov hom thiab qib ntawm cov hlau uas tuaj yeem siv los ua cov kav dej.Qhov no suav nrog cov tshuaj muaj pes tsawg leeg ntawm cov hlau, uas yuav tsum muaj cov feem pua ntawm cov ntsiab lus xws li carbon, manganese, phosphorus, sulfur thiab silicon.Cov kev cai no tseem ceeb heev kom ntseeg tau tias cov hlau siv hauvcov kav dejua tau raws li qhov tsim nyog lub zog thiab kev tiv thaiv corrosion.
Cov txheej txheem tsim khoom rau ASTM A139 yeeb nkab suav nrog electrofusion (arc) vuam, uas siv cov hluav taws xob arc los ua kom muaj cua sov uas xav tau los vuam strips ntawm cov hlau rau hauv cov duab cylindrical.Cov txheej txheem no tau ua tib zoo tswj xyuas kom ntseeg tau tias cov welds zoo thiab tsis muaj qhov tsis xws luag.Tus txheej txheem kuj qhia txog cov kev tshuaj xyuas rau welds, xws li kev kuaj ultrasonic thiab transversely coj khoov kuaj, kom ntseeg tau tias lawv ua tau raws li cov qauv tsim nyog.
Hais txog qhov ntev, ASTM A139 qhia txog qhov yuav tsum tau ua rau cov yeeb nkab loj, phab ntsa tuab, thiab ntev.Qhov no suav nrog kev zam tshwj xeeb ntawm qhov ntev kom ntseeg tau tias cov yeeb nkab ua tau raws li qhov tsim nyog tshwj xeeb rau nws qhov kev npaj siv.Cov kev xav tau ntawm qhov ntev no yog qhov tseem ceeb los xyuas kom meej tias cov kav dej tau nruab thiab sib txuas kom raug hauv ntau yam kev siv.
Cov khoom siv xws li lub zog tensile, lub zog tawm los, thiab elongation kuj tau teev tseg hauv ASTM A139.Cov khoom no tseem ceeb hauv kev txiav txim siab lub zog thiab kev ua haujlwm ntawm cov yeeb nkab nyob rau hauv ntau yam kev ua haujlwm.Tus qauv teeb tsa yam tsawg kawg nkaus rau cov khoom siv kho tshuab kom ntseeg tau tias cov yeeb nkab tuaj yeem tiv taus siab, kub thiab ib puag ncig.
Zuag qhia tag nrho, ASTM A139 plays lub luag haujlwm tseem ceeb hauv kev tsim khoomcov kav hlaurau ntau yam kev siv.Los ntawm kev qhia cov ntaub ntawv, kev tsim cov txheej txheem, qhov ntev thiab cov khoom siv kho tshuab ntawm cov kav dej, tus qauv ua kom cov khoom kawg ua tau raws li cov qauv tsim nyog thiab kev nyab xeeb.Nws muab cov tuam txhab tsim khoom, engineers thiab cov neeg siv kawg kev ntseeg siab tias cov yeeb nkab yuav ua tau raws li qhov xav tau hauv nws daim ntawv thov.
Hauv cov ntsiab lus, kev nkag siab qhov tseem ceeb ntawm ASTM A139 hauv kev tsim cov yeeb nkab yog qhov tseem ceeb rau kev ua kom zoo thiab kev nyab xeeb ntawm cov khoom siv steel yeeb nkab.Tus qauv tsim tawm cov kev cai tsim nyog rau cov khoom siv, cov txheej txheem tsim khoom, qhov ntev thiab cov khoom siv kho tshuab kom ntseeg tau tias cov kav dej ua tau raws li cov qauv tsim nyog thiab kev ua haujlwm zoo.Los ntawm kev ua raws li ASTM A139, cov chaw tsim khoom tuaj yeem tsim cov yeeb nkab steel zoo uas ua tau raws li qhov xav tau ntawm ntau yam kev lag luam thiab kev siv.
Post lub sij hawm: Dec-28-2023