We have a 1951/52 vessel "alteration" to do and the shell material along with some very large nozzles and all reinforcement pads utilize SA 285-C FBQ material. I know that FBQ means Fire Box Quality and I have seen it used with other materials also. Does anyone out there know if all SA 285-C material is FBQ or is this some special version of SA 285-C. You see FBQ more on much older vessels. What does Fire Box Quality (FBQ) mean?
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