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US 11,246,382 B2Granted
Copper alloy fastener element and slide fastener
AssigneeYKK Corporation
InventorsTakanori Kumei, Atsushi Ogihara, Chikako Hiromi, Yoshio Taira, Muneyoshi Yokota, Takahiro Fukuyama, Kouta Kido
Life of this patent
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Abstract
Provided is a copper alloy fastener element which improves season cracking resistance by a means different from that of increasing a ratio of a β phase. The copper alloy fastener element includes a copper-zinc alloy as a base material, the base material having: an apparent zinc content of from 34 to 38%; a dendrite structure; and a β phase at a ratio of 10% or less.
Claims9
A copper alloy fastener element comprising a copper-zinc alloy as a base material, the base material having:
- an apparent zinc content of from 34 to 38% by mass;
- a dendrite structure;
- and a β phase at a ratio of 10% or less.
Dependencies are inferred from the claim text.