F91 Valve
F91 Valve
(OP)
In F91 Globe valve 316disc was used, customer complain Disc eroding, Working temperature 550°C Pressure 160bar, Steam,Can we say F316 wrong material selection & suggest F91/Inconel disc material.
In B16.34, A 182 Gr. F316, At temperatures above 538°C, use only when the carbon content is 0.04% or higher. Flanged end valve ratings terminate at 538°C. Please clarify
In B16.34, A 182 Gr. F316, At temperatures above 538°C, use only when the carbon content is 0.04% or higher. Flanged end valve ratings terminate at 538°C. Please clarify





RE: F91 Valve
RE: F91 Valve
RE: F91 Valve
RE: F91 Valve
What might be the causes for 316 eroding
RE: F91 Valve
RE: F91 Valve
It means you need to read this requirement.
RE: F91 Valve
RE: F91 Valve
Second point, this is a dissimilar material combination F91 ferritic in contact with an austenitic stainless steel in elevated temperature service which means from a design standpoint you have differences in the linear coefficient of expansion. This translates to thermal stresses at elevated temperature resulting in possible warpage and cracking. If anything, you should have used a Cr-Mo or Cr-Mo-V seat material with Stellite hardfacing for steam erosion resistance.
RE: F91 Valve
RE: F91 Valve