Jfe Steel Corporation

Sony Corporation

Sony Computer Entertainment Inc.

Sony Interactive Entertainment Inc.

Masayuki Kasai

Yasutaka Miwa

Nobukazu Koyama

Kimihiro Nishimura

Hiroaki Aonuma

Takashi Iwamoto

Naoya Ihara

Kunikazu Tomita

Kazuaki Fukuoka

Free-cutting steel includes a specific composition, with an A value defined by a following formula (1) satisfying 4.0 or more and 20.0 or less, and remainder having Fe and an unavoidable impurity; and texture with 1000 or more sulfide particles with an equivalent circle diameter of less than 1 μm per mm, 500 or more sulfide particles with an equivalent circle diameter of 1 μm or more and 5 μm or less per mm, and 1000 or more Pb particles with an equivalent circle diameter of 1 μm or less per mm, whereinA value=(Mn+5Cr)/S  (1)

Free-cutting steel and manufacturing method thereof

A component comprising a core part and a surface layer is provided. The core part contains C: 0.01%≤ and <0.20%, Si: ≤1.0%, Mn: 1.5%≤ and ≤3.0%, P: 0.02% or less, S: ≤0.06%, Cr: 0.30%≤ and ≤3.0%, Mo: 0.005%≤ and ≤0.40%, V: 0.02%≤ and ≤0.5%, Nb: 0.003%≤ and ≤0.20%, Al: 0.010%≤ and ≤2.0%, Ti: 0.005%< and <0.025%, N: ≤0.0200%, Sb: 0.0005%≤ and ≤0.02%, and the balance consisting of Fe and incidental impurities; and a steel microstructure that contains bainite phase in an area ratio of more than 50%. The surface layer has high nitrogen and carbon contents relative to the chemical composition of the core part.

Steel for nitrocarburizing and nitrocarburized component, and methods of producing same

Provided is a steel for nitrocarburizing that ensures mechanical workability before nitrocarburizing treatment. A steel for nitrocarburizing comprises: a chemical composition containing, in mass %, C: &#x2265;0.02% and &#x3c;0.15%, Si: &#x2264;0.30%, Mn: 1.5-2.5%, P: &#x2264;0.025%, S: &#x2264;0.06%, Cr: 0.5-2.0%, Mo: 0.005-0.2%, V: 0.02-0.20%, Nb: 0.003-0.20%, Al: &#x3e;0.020% and &#x2264;1.0%, Ti: &#x3e;0.0050% and &#x2264;0.015%, N: &#x2264;0.0200%, Sb: 0.0030-0.010%, with a balance being Fe and inevitable impurities, satisfying Expression (1) or (2); and a steel microstructure where an area ratio of bainite phase is &#x3e;50%, a prior austenite grain size is &#x2264;100 &#x3bc;m, &#x2265;300/&#x3bc;mTi precipitates with an equivalent circular particle size of &#x2264;30 nm disperse, Sb segregates to prior austenite grain boundaries.

Provided is a steel for nitrocarburizing that can ensure hardened case depth by suppressing precipitation of Cr, V, and Nb in a part of the surface layer very close to the surface. The provided steel comprises: a specific chemical composition satisfying 9.5&#x2264;([Cr]/52+[V]/50.9+[Nb]/92.9+M)&#xd7;10&#x2264;18.5, with the balance being Fe and inevitable impurities; and a steel microstructure in which an area ratio of bainite phase with respect to the entire microstructure is more than 50%.

Steel for nitrocarburizing, and component

An acquisition unit acquires presence information of an information processing device of another via server. When the acquisition unit acquires pieces of presence information including the same user account from two or more information processing devices, a status image generation unit generates a status image indicating a status of the user identified by the user account, by referring to the latest presence information. In order to represent the status of the user, the status image generation unit includes a name of an application being run by the user in the status image.

Information processing device, server, and information processing system

An acquisition unit acquires, via a communication unit, presence information including status information indicating the status of execution of an application from a separate information processing device. A status image generation unit refers to the status information and determines a display mode for presenting the status of execution of the application to a user. The status image generation unit determines a display mode of a mark to indicate whether the user can participate in a session of an application.

Growing community of inventors

Tokyo, Japan

Masayuki Kasai