The hardware industry of steel fire door configuration is stainless steel, and all have certain fire resistance.

https://ztfiredoor.com/12214.html

horizontal sliding fire doors,2hr fire rated access panels,2 hour fire door,2 hour fire rated door,horizontal sliding fire doors,four panel fire door,2hr fire rated door,2 hour fire door,2 hour fire rated access panels,horizontal sliding fire doors,2 hour fire rated door price,four panel fire door,30 x 78 fire rated door,2 hour fire door,2 hour fire door prices,four panel fire door,2hr fire rated door price,2ft fire door