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US 11,441,219 B2Granted
Black plated steel sheet and manufacturing method therefor
AssigneeResearch Institute of Industrial Science & Technology
InventorsHye Jeong Kim, Gab Sik Byun, Kyung Hwang Lee, Mi Seon Choi
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Abstract
Embodiments of the present invention provide a technique for forming a film having a high added value appearance quality and excellent hardness on the surface of a steel sheet in a short time.
Claims12
A method for producing black plated steel sheet comprising:
- an air removing step of removing some or all of the air inside a sealed container;
- an oxygen input step of injecting oxygen (O2) into the sealed container after the air removing step;
- and
- a humidifying heat treatment step of Zn plated steel sheet or Zn alloy-based plated steel sheet in the sealed container after the oxygen input step;
- wherein, in the humidifying heat treatment step, a brightness L value on the surface of the plated steel sheet is controlled to 60 or less (except 0),
- wherein, the air removing step is to remove all the air in the sealed container until the pressure inside the sealed container reaches 0 bar.
3 more elements
Dependencies are inferred from the claim text.