1. Dab tsi yog qhov sib txawv ntawm cov pa roj carbon steel thiab alloy steel kav?
Teb:Cov pa roj carbon steel kav muaj cov pa roj carbon zoo li cov hlau tseem ceeb, thaum cov kav hlau alloy muaj feem pua ntawm lwm cov ntsiab lus xws li chromium, molybdenum, lossis npib tsib xee los txhim kho cov khoom tshwj xeeb.
2. Cov yeeb nkab "galvanized" yog dab tsi, thiab qib twg feem ntau siv rau nws?
Teb:Galvanized yeeb nkab yog coated nrog zinc rau corrosion kuj. ASTM A53 Qib B yog cov khoom siv hauv paus rau cov kav dej galvanized.
3. ASTM A179 yog dab tsi?
Teb:ASTM A179 yog ib qho kev qhia tshwj xeeb rau seamless txias-kos qis- cov pa roj carbon hlau siv hauv cov khoom siv hluav taws xob, cov khoom sib txuas, thiab cov khoom siv hluav taws xob zoo sib xws.
4. Dab tsi yog qhov tseem ceeb ntawm API 5L Qib B yeeb nkab?
Teb:Nws feem ntau yog siv los sib sau ua ke thiab xa cov kab hauv kev lag luam roj thiab roj rau qis - mus rau - cov ntawv thov siab nruab nrab.
5. "P Number" txhais li cas hauv cov lej vuam?
Teb:Hauv cov lej xws li ASME Tshooj IX, P-Cov lej pawg hauv paus hlau nrog cov yam ntxwv zoo sib xws. Feem ntau cov carbon steels (piv txwv li, A106 Gr B) yog pab pawg hauv qab P-Number 1.
