Long-life carburizing bearing steel

Details Long-life carburizing bearing steel Long-life carburizing bearing steel

C - Chemistry, Metallurgy

22

C

C22C 38/14 (2006.01) C22C 38/00 (2006.01) C22C 38/18 (2006.01) C22C 38/28 (2006.01) C22C 38/50 (2006.01) C23C 8/22 (2006.01)

Patent

CA 2185688

This invention aims at providing a carburizing bearing steel which can provide excellent rolling fatigue characteristics by providing a long life carburizing bearing steel comprising, in terms of percent by weight, 0.1 to 0.35% of C, 0.3 to 2.0% of Mn, 0.001 to 0.03% of S, 0.4 to 1.5% of Cr, 0.01 to 0.07% of A?, 0.003 to 0.015% of N, 0.0005 to 0.03% of T.Mg, "0.35 to 1.70% of Si" or "0.05 to 1.70% of Si and 0.30 to 1.20% of Mo", a specific amount of at least one member consisting of Ni and V, and not more than 0.025% of P, and not more than 0.0050% of Ti and not more than 0.0020% of T.O, wherein a number ratio of Mg type oxides contained in the steel is at least 0.8.

Un acier cémenté de longue durée, destiné à des roulements, permet de fabriquer des éléments de roulements qui présentent une excellente résistance à la fatigue de roulement. Cet acier contient 0,1-0,35 % de C, 0,3-2 % de Mn, 0,001-0,03 % de S, 0,4-1,5 % de Cr, 0,01-0,07 % d'Al, 0,003-0,015 % de N et 0,0005-0,03 % de T.Mg. Il contient aussi 0,35-1,7 % de Si éventuellement mélangé avec 0,03-1,2 % de Mo, et à titre facultatif Ni et/ou V, chacun en quantité précise, ainsi que P, Ti et T.O en des quantités respectivement limitées à 0,025 % ou moins, 0,005 % ou moins et 0,002 % ou moins. Cet acier présente un rapport de 0,8 ou plus entre le nombre de particules d'oxyde de Mg et le nombre total de particules.

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