C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
C21D 9/00 (2006.01) C22C 38/00 (2006.01) C22C 38/04 (2006.01) C22C 38/22 (2006.01) C22C 38/24 (2006.01)
Patent
CA 2478998
A method for providing a steel product having a surface hardness of between about 360 Bhn and 420 Bhn is provided. The method includes steps of providing a steel product from a steel product comprising at least about 96 wt.% iron and between about 0.24 wt.% and about 0.30 wt.% carbon, heating the steel product to at least its austentizing temperature, quenching to below its martinsite finish temperature, and tempering the steel product at a temperature of at least about 800~F. Steel products prepared by this method are described.
L'invention concerne un procédé de fabrication de produit en acier à dureté superficielle comprise entre environ 360 Bhn et 420 Bhn, qui consiste à fournir un produit en acier à partir d'acier renfermant, en poids, au moins environ 96 % de fer, et entre environ 0,24 % et environ 0,30 % de carbone, puis à chauffer ce produit au moins jusqu'à sa température d'austénitisation, à refroidir ensuite ledit produit pour descendre en-dessous de sa température de finition de martinsite, et enfin à tremper le produit à une température d'au moins environ 800 ·F. L'invention concerne également des produits en acier réalisés selon le procédé décrit.
Jackson Brett M.
Peppler William J.
Cargill Incorporated
Gerdau Ameristeel Us Inc.
Sim & Mcburney
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