a 285 c fbqe

thread177 297351Fire Box Quality means suitable for use in a boiler firebox. Retains pressure and is exposed to flame. Such as a steam locomotive. Check this site out. trainweb/tusp/r_links1Just to add to the above after a little digging around of my files; Firebox Quality steel plate had tighter control over chemical composition to assure specified minimum mechanical properties prior to the development of SA 515 steel plate. SA 285 Grade C is not the same as fire box quality SA 285 Grade C. If anything, SA 515 plate would be an equivalent material substitution.As an old steel maker, SA 285 Grade C, fire box quality, was fully deoxidized Silicon killed.1I agree with metengr. It is unlikely you will find any FBQ and if you do the paper trail may not be there. Have hand forged a couple of rear flue sheets in some restorations and used 515,but thats another story. Do your calcs. and check with your AIA.Additionally, the 1950 ASME Code information on SA 285 C FBQ material states 55k min. tensile, 1375psi allow. stress upto 650oF, 13k upto 700oF & 11900 upto 750oF. Information from the 1951 drawings state this material shall have "shear test per ASME Code case #896 required (1948 ruling)". Finally, I would like to especially thank metengr, deanc & stanweld for their insight and shedding light on this issue. I want you to know that this small clarification has helped me and it has, once again, helped influenced my supervisors opinion of my ASME Code abilities. I am appreciative of these replies and for Eng Tips.