Carbon Hlau Flange, uas yog, cov khoom siv lub cev yog cov khoom siv hlau yog cov pa roj hmab steel lossis kawg flange txuas. Cov flanges uas muaj cov roj hlau hlau yog hu ua cov roj carbon hlau. Cov ntaub ntawv cov khoom siv yog cov khoom siv hlau A105 \ / A105N, Astm A694 F42, P265, P265GH, P255GH. Dhau li ntawm cov roj carbon steel flanges, peb kuj muab cov hlau nplaum sib dhos thiab cov hlau stainless.