| 摘要 |
PURPOSE:To form an Fe3O4-base blackened film on the surface of a stainless steel material by heating the steel material to a specified temp. in an atmosphere of gaseous CO2 or steam. CONSTITUTION:When a blackened film is formed on the surface of a stainless steel material for the grid of a fluorescent display tube, the steel material is heat treated at 400-700 deg.C for 5-120min in an atmosphere of gaseous CO2 or steam. An Fe3O4-base blackened film can be easily formed on the surface of the stainless steel material.
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