US 11,732,342 B2
Method for carburizing steel member, steel component, and carburizing agent
Tomoyuki Nakamoto, Kanagawa (JP); and Yuuji Miyamoto, Kanagawa (JP)
Assigned to NSK LTD, Tokyo (JP)
Appl. No. 18/18,163
Filed by NSK LTD., Tokyo (JP)
PCT Filed Jan. 14, 2022, PCT No. PCT/JP2022/001236
§ 371(c)(1), (2) Date Jan. 26, 2023,
PCT Pub. No. WO2022/154105, PCT Pub. Date Jul. 21, 2022.
Claims priority of application No. 2021-004298 (JP), filed on Jan. 14, 2021.
Prior Publication US 2023/0227958 A1, Jul. 20, 2023
Int. Cl. C23C 8/66 (2006.01)
CPC C23C 8/66 (2013.01) 10 Claims
OG exemplary drawing
 
1. A method for carburizing a steel member, the method comprising:
bringing a carburizing agent into contact with at least a part of a surface of a steel member; and
heating the steel member and the carburizing agent to allow carbon to penetrate into at least a part of the surface,
wherein the carburizing agent contains a Fe-C alloy powder, a graphite powder in an amount of 20% by volume or more and 70% by volume or less relative to a total volume of the carburizing agent, and a binder that binds the Fe-C alloy powder and the graphite powder to each other, and
in the heating, a heating temperature is held for a certain period of time within a temperature range of an austenite region equal to or higher than a eutectic point of the steel member and lower than a peritectic point of the steel member.