Patent Number: 6,309,475

Title: Rolling element and producing method

Abstract: For easily producing a toothed material for high-strength gears etc. with aplastic working technique, deformation resistance occurring in plasticworking is reduced and stable high precision plastic working is enabled atlower temperatures. One or more types of heat treatment selected fromcarburization, carbonitriding and nitriding and a hardening process areapplied to an alloy steel material containing: iron as a main component;at least 1.0 to 4.5 wt % Si; 0.35 wt % or less C; and balance Fe andunavoidable impurities, whereby a rolling element is obtained which has asurface layer mainly composed of martensite containing no .alpha.-Fe phaseand of residual austenite and an inner structure cooled from an(.alpha.+.gamma.)-Fe two phase region.

Inventors: Takayama; Takemori (Hirakata, JP), Nakao; Chikara (Hirakata, JP)


International Classification:

Expiration Date: 10/32013