C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 38/12 (2006.01) C21D 1/26 (2006.01) C21D 1/84 (2006.01) C21D 8/00 (2006.01) C21D 8/06 (2006.01) C22C 38/60 (2006.01) C21D 5/14 (2006.01)
Patent
CA 2183441
This invention provides a fine graphite uniform dispersion steel material excellent in cold workability, cuttability and hardenability by particularly dispersing graphite finely and uniformly, and a production method thereof, this steel comprising 0.30 to 1.0% of C, 0.4 to 1.3% of Si, 0.3 to 1.0% of Mn, 0.0003 to 0.006% of B, 0.002 to 0.010% of N and 0.05 to 0.20% of Mo as the basic components and contains graphite having a mean grain diameter of not more than 4.0 µm and a number of grains of at least 3,000 pcs/mm2, and the production method comprising cooling the steel having these components at a cooling start temperature of not less than an A~1 point, a cooling end temperature of not more than an M s point and a mean cooling rate of 5 to 100 °C/s.
Un matériau d'acier contient en dispersion uniforme de fines particules de graphite. Ce matériau, facilement écrouissable, usinable et trempable, est obtenu en y dispersant spécialement uniformément cinq particules de graphite. Cet acier contient notamment comme composants de base, 0,30 à 1 % de carbone, 0,4 à 1,3 % de silicium, 0,3 à 1 % de manganèse, 0,003 à 0,006 % de bore, 0,002 à 0,01 % d'azote et 0,05 à 0,2 % de molybdène. La granulométrie moyenne des particules de graphite n'excède pas 4 mu m, pour une numération minimale de 3000 par mm<2>. Le procédé de fabrication utilise un refroidissement de l'acier dont la température est au moins égale au point Ar1 en début de refroidissement, et n'excède pas le point Ms en fin de refroidissement, pour une pente moyenne allant de 5 à 100 DEG C/s.
Katayama Sakae
Naito Ken-Ichiro
Tarui Toshimi
Toda Masahiro
Goudreau Gage Dubuc
Nippon Steel Corporation
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