They were in a junk bin at work being the weren't labeled we could use them. I work for a military contractor on jber.
They won't come into direct contact with anyfire. There will be soft fire brick between the fasteners and the fire. But they will be holding the t burner the is screwed into a floor flange on the forge.
It will only be being used out side. Landlord is ok with me blacksmithing just not in the garage. So I'll have plenty of ventilation.