1. Q: Dab tsi ua rau "graphitization" hauv carbon steel kav zoo li A106 Gr. B tom qab ntev - kev pabcuam sijhawm?
A:Graphitization yog decomposition ntawm hlau carbide (cementite) rau hauv cov hlau dawb thiab carbon (graphite) nodules. Nws tshwm sim thaum carbon hlau raug kub siab tshaj 425℃(800℃F) rau ncua sij hawm (txhiab txhiab teev). Cov nag lossis daus ntawm graphite no txo qis lub zog thiab ductility ntawm cov hlau, ua rau nkig tsis ua haujlwm. Nws yog lub neej tseem ceeb- txwv qhov tseem ceeb rau A106 Gr. B nyob rau hauv siab -kub kev pab cuam.
2. Q: Vim li cas ASTM A53 Hom F (Lub Rauv Butt-Welded) feem ntau tsis tso cai rau kev pabcuam hnyav?
A:Nyob rau hauv A53 Hom F, cov yeeb nkab yog tsim thiab seam yog welded los ntawm tshav kub thiab siab yam tsis muaj muab tub lim hlau. Qhov no tsim ib qho kev nqis tes ua los yog "weld flash" nyob rau sab hauv ntawm cov yeeb nkab, uas ua raws li qhov kev ntxhov siab. Nyob rau hauv cyclic loading (siab los yog thermal), cov kab nrib pleb muaj feem yuav pib ntawm qhov no, ua rau qaug zog tsis ua hauj lwm.
3. Q: Dab tsi yog qhov tseem ceeb ntawm "Tua neeg" hauv cov hlau zoo li ASTM A106?
A:"Tua" steel yog tag nrho deoxidized. Thaum lub sij hawm solidification, nws solidifies ntsiag to tsis muaj roj evolution, ua rau ib tug ntau yam tshuaj muaj pes tsawg leeg thiab tsawg voids (porosity). Qhov no tsim cov khoom sib xws thiab suab ntau dua nrog cov khoom siv kho kom zoo dua qub, qhov tseem ceeb rau cov ntawv thov (siab kub / siab) uas A106 kav dej ua haujlwm.
4. Q: Peb yuav tsum tau siv lub tshuab carbon steel yeeb nkab rau fittings. ASTM A106 Gr. B haum?
A:Thaum machinable, A106 Gr. B tsis yog qhov zoo tagnrho rau kev ua haujlwm loj. Rau qhov xav tau kev ua haujlwm zoo, cov yeeb nkab ua los ntawmTIAB SA 1018steel yog nyiam dua . 1018 muaj cov pa roj carbon thiab manganese tswj ntau dua, ua rau muaj kev ua kom zoo dua qub thiab ua kom zoo dua qub, ua kom tiav qhov zoo dua, thiab lub neej ntev dua.
5. Q: Dab tsi yog qhov kev pheej hmoo ntawm galvanic corrosion thaum txuas carbon steel yeeb nkab rau stainless hlau valve?
A:Carbon steel (anodic) yog tsawg tshaj li stainless hlau (cathodic). Thaum lawv txuas nrog hluav taws xob nyob rau hauv lub xub ntiag ntawm ib qho electrolyte (xws li, dej), cov pa roj carbon steel yeeb nkab yuav corrode nyiam thiab ntawm tus nqi nrawm. Txhawm rau txo qhov no, siv cov khoom siv insulating thiab cov khoom siv flange txhawm rau txhawm rau hluav taws xob hluav taws xob, lossis xav txog kev tiv thaiv txheej ntawm cov pa roj carbon steel.
