Stainless steel flange nuts and general stainless steel hexagon nuts size and thread specifications are basically the same, but compared with stainless steel hexagon nuts, stainless steel flange nuts are gaskets and nuts are integrated, and there are non-slip teeth below, which increases the surface area of the nut and the workpiece contact, compared with the combination of ordinary nuts and washers, more solid and greater tension.
Generally common stainless steel flange nut specifications are roughly below M12, because most flange nuts are used in pipes and flanges, so by the workpiece constraints, flange nut specifications compared with the nut is less. Some of the flange nuts above M12 are mostly flat flanges, that is, the flange surface has no teeth, most of these nuts are used in some special equipment and special places, stainless steel flanges are connected in the flange table to impose 573K temperature load.
There is no insulation layer applied on the outer surface of the flange and the pipe. The influence of the air layer of the bolt hole, the air layer between the upper and lower flanges and the heat transfer of the outer surface of the flange on the temperature dispersion of the system is considered. The equivalent convective heat transfer coefficient is applied to the outer surface of the flange, the bolt nut and the air touch part, and the equivalent thermal conductivity is applied to the air layer of the bolt hole and the air layer between the upper and lower flanges.