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US 11,143,257 B2Granted
Steel wire for spring
AssigneeSumitomo Electric Industries, Ltd.
InventorsTakafumi Uwano, Taketoshi Sasaki, Takao Yamazaki
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Abstract
A steel wire for a spring includes a steel wire that has Ca or Na adhered thereto in an amount of 0.2 g/m2 or less. The steel wire has an oxide film on a surface thereof, and the oxide film has a thickness of, for example, from 2.0 μm to 20 μm.
Claims5
A steel wire for a spring, having a non-zero amount of Ca adhered thereto in an amount of 0.2 g/m2 or less or having a non-zero amount of Na adhered thereto in an amount of 0.2 g/m2 or less, wherein
- the steel wire has an oxide film on a surface thereof, and
- the oxide film has a thickness of from 2.0 μm to 20 μm.
Dependencies are inferred from the claim text.