Hyundai Motor Company

Kia Motors Corporation

Kia Corporation

Hyundai Steel Company

Chang Won Kang

Min Woo Kang

Dong Hwi Kim

Sang Won Lee

Bong Lae Jo

Myung Sik Kim

Sung Min Hong

Gung Seung Nam

In Beom Lee

A steel for a gear includes, based on a total weight of the steel: C: 0.10-0.30 wt %, Si: 0.60-0.80 wt %, Mn: 0.25-0.75 wt %, Cr: 1.80-2.20 wt %, Ni: 0.50-1.50 wt %, Mo: 0.20-0.40 wt %, Nb: 0.025-0.050 wt %, V: 0.030-0.050 wt %, and a balance of Fe and inevitable impurities, wherein contents of Nb and V satisfy the following <Relationship Formula 1>:0.055<[Nb]+[V]<0.100  <Relationship Formula 1>,

Steel for gear and method for manufacturing gear using the same

Disclosed is a carburization heat treatment method including carburizing a workpiece at a relatively low temperature within a temperature range of A&#x2dc;Ausing a vacuum carburizing furnace and then performing quenching using a high-pressure gas, in which the workpiece is made of typical carburizing alloy steel having a carbon content of about 0.10&#x2dc;0.35 wt %. This method can be applied to carburization heat treatment of a steel workpiece sensitive to heat deformation, such as an annulus gear, in lieu of a conventional gas carburization method using plug quenching.

Carburization heat treatment method and method of use

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Gyeonggi-do, South Korea

Chang Won Kang