1. Q: Vim li cas thiaj li normalizing kev kho cua sov tau teev tseg rau qee qib xws li API 5L X70?
A:Normalizing (cua sov tshaj qhov tseem ceeb kub thiab cua txias) refines lub grain qauv ntawm hlau. Rau siab -cov kav dej muaj zog zoo liX70, cov txheej txheem no ua kom muaj qhov zoo, zoo ib yam microstructure (feem ntau yog pearlite zoo -ferrite mix). Qhov no ua rau kom muaj zog, txhim kho lub zog sib npaug ntawm cov yeeb nkab qhov ncig, thiab muab cov weldability zoo dua los ntawm kev tiv thaiv cov qoob loo ntau dhau ntawm HAZ.
2. Q: Dab tsi yog qhov txiaj ntsig tseem ceeb ntawm kev siv Hluav Taws Xob Welded (ERW) yeeb nkab zoo li ASTM A135 hla seamless?
A:Lub ntsiab kom zoo dua yognqi. Cov txheej txheem ERW muaj txiaj ntsig zoo rau kev tsim cov yeeb nkab ntev ntev nrog cov phab ntsa tuab tuab ntawm tus nqi qis dua li cov txheej txheem tsim khoom seamless. Rau ntau yam tsis yog- daim ntawv thov tseem ceeb (xws li, qis- cov kav dej siab, laj kab, kev txhawb nqa cov qauv), ERW yeeb nkab zoo li A135 yog qhov kev xaiv zoo tshaj plaws thiab kev lag luam.
3. Q: Yuav ua li cas nce cov ntsiab lus carbon, xws li ASTM A53 Gr. A vs. Gr. B, cuam tshuam rau cov yeeb nkab cov khoom?
A:Cov ntsiab lus carbon ntau dua (Gr. B muaj ~ 0.30% max vs. Gr. A's ~ 0.25% max) nce tensile thiab yield zog tab sis txo ductility. Qhov no kuj cuam tshuamweldability. Gr. B muaj zog dua tab sis me ntsis yooj yim dua rau kev tawg thaum vuam yog tias tsim nyog ua ntej - cua sov thiab cov txheej txheem tsis ua raws, piv rau qis carbon Gr. A.
4. Q: Lub hom phiaj ntawm kev ntsuas hydrostatic ua rau cov kav dej siab zoo li A106 thiab A53 yog dab tsi?
A:Kev ntsuam xyuas hydrostatic yog kev tswj xyuas kom zoo thiab ua pov thawj. Txhua cov yeeb nkab tau ntim nrog dej thiab nias rau qhov kev ntxhov siab uas tshaj nws qhov tsawg kawg nkaus yield zog rau lub sijhawm luv. Qhov no ua kom muaj kev ncaj ncees ntawm cov yeeb nkab (piv txwv li, nws tsis muaj qhov xau) thiab xyuas nws lub peev xwm kom muaj kev nyab xeeb ntawm nws qhov ntsuas siab yam tsis tas yuav deformation lossis tsis ua haujlwm.
5. Q: Peb puas tuaj yeem siv cov yeeb nkab dub (ASTM A53) rau cov tshuab cua compressed?
A:Yog, nws yog heev. Txawm li cas los xij, cov nplai dub (hlau oxide) ntawm sab hauv tuaj yeem tawg tawm thiab ua rau cov cuab yeej pneumatic puas. Lub uncoated sab hauv kuj yog rusting los ntawm condensed ya raws, kis kab mob. Rau huv, qhuav cua tshuab,Galvanized (A53, galvanized)los yog stainless hlau kav yog nyiam, tab sis galvanized yuav tsum tsis txhob siv yog compressed cua yuav muaj roj vapors.
