TWI310799B

A manufacturing method of a steel floor for a clean room is provided to manufacture a steel floor for a clean room simply, to heighten production efficiency and to lower down on the cost. A manufacturing method of a steel floor(100) for a clean room comprises the steps of: manufacturing a frame bar and a cover plate(20) with a press process to have insertion grooves, projecting pins(13) and projections on each frame bar and grooves(21) on each cover plate; forming a frame structure(10) by arranging/assembling many frame bars in vertical and horizontal directions and connecting to cross each other through the insertion grooves of the frame bars; installing the frame structure on a graphite pallet, putting many aluminum oxide plates on the frame structure and placing heavy objects evenly, and placing in a primary heat treatment stove and treating with heat primarily; regulating the deformation of the frame structure and inputting a solder to the frame structure; installing the frame structure with the solder on