C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 38/14 (2006.01) C21D 8/00 (2006.01) C21D 8/02 (2006.01) C22C 38/04 (2006.01)
Patent
CA 2241127
A method of manufacturing a thick steel product of high strength and high toughness having excellent weldability with minimal variation of material properties, comprises heating a steel raw material to the temperature of Ac3 to 1350°C, hot rolling and then cooling at the cooling rate of 10 °C/sec. or less. The steel raw material has the following composition: C: 0.001 - 0.025 wt%; Mn: 1.0 - 3.0 wt%; Ti: 0.005 - -0.20 wt%; Nb: 0.005 - 0.20 wt%; B : 0.0003 - 0.0050 wt%; and Al: 0.01 - 0.100 wt% balance substantially Fe and incidental impurities. The composition has a transformation start temperature (Bs) of 670°C or less. Since the steel product obtained by the method has no variation in physical properties regardless of variation in cooling rate, it is possible to supply steel products of high strength and high toughness which have uniform microstructure and properties along their thickness direction and are excellent in weldability.
Amano Keniti
Hayashi Tohru
Kawabata Fumimaru
Okatsu Mitsuhiro
Jfe Steel Corporation
Kawasaki Steel Corporation
Moffat & Co.
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