08-12-2017 дата публикации
Номер: KR1020170135498A
Принадлежит:
The present invention relates to easy-to-cut high-strength nitrifying steel and a heat treatment method optimized for an annular gear (ring gear) of a planet gear set of an automatic transmission and, more specifically, relates to steel for an annulus gear and a gas nitrifying method for steel in which alloy components are optimized; and a heat treatment condition, workability, and durability improved. More specifically, in accordance with the steel for the annulus gear, the annulus gear manufactured using steel, and the gas nitrifying method for the steel in accordance with the present invention; it is possible to considerably improve cutting, workability, and durability of a compound layer when compared with an existing steel for the annulus gear by adding iron (Fe) as a base, carbon (C), silicon (Si), manganese (Mn), phosphorus (P), sulfur (S), chromium (Cr), copper (Cu), aluminum (Al), vanadium (V), and the like. In addition, an optimal heat treatment method capable of manufacturing ...
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