C - Chemistry – Metallurgy – 21 – C
Patent
C - Chemistry, Metallurgy
21
C
75/131
C21C 7/00 (2006.01) C22C 33/04 (2006.01) C22C 38/44 (2006.01) C22C 38/46 (2006.01)
Patent
CA 1283796
ABSTRACT OF THE DISCLOSURE A high-strength steel for valve springs, consisting of 0.50-0.70 wt.% of carbon, 1.50-2.50 wt.% of silicon, 0.50-1.20 wt.% of manganese, 1.50-2.50 wt.% of nickel, 0.50-1.00 wt.% of chromium, 0.20-0.50 wt.% of molybdenum, 0.15-0.25 wt.% of vanadium, and the balance being iron and inevitably included inclusions. Also disclosed is a process for producing such a high-strength steel, which includes a step of minimizing oxygen in a melt of the steel, so as to reduce the oxygen content of the steel to 15 ppm or less, and a step of adding calcium to the melt and thereby controlling the form of the inclusions. The process may further includes a step of minimizing titanium and nitrogen in the melt, so as to reduce the titanium and nitrogen content of the steel to 50 ppm or less, and 60 ppm or less, respectively.
527744
Iikubo Tomohito
Ito Yukio
Saka Tsutomu
Borden Ladner Gervais Llp
Daido Tokushuko Kabushiki Kaisha
Honda Giken Kogyo Kabushiki Kaisha
Iikubo Tomohito
Ito Yukio
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