Huitong Special Steel Co.,Ltd is a famous China stainless steel flange manufacturer and supplier, ... sealing surface such as FF, RF, LJ, FM, R.T.J ,R.J. Our products have been widely used in many fields both ... so on. Sealing surface: FF, RF, LJ, FM, R.T.J , R.J and so on. Application: The stainless steel flanges are widely ...