C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
75/152, 148/31
C22C 38/04 (2006.01) C21D 8/02 (2006.01)
Patent
CA 1091959
ABSTRACT OF THE DISCLOSURE The potent hardenability effect of manganese and its relatively low cost and availability make it an attractive candidate for the production of high strength steels, especially in the range of about 2.0 to 6.0 percent manganese. The main deterent to the use of such high manganese steels has been their poor toughness. This can be improved by producing steels with high purity or with controlled low carbon contents. However, the requirements of high purity and very low carbon tend to offset, to a large extent, the cost advantage of manganese. The instant invention utilizes an intercritical anneal at a temperature just slightly above austenite start temperature (As) in order to form retained austenite at the grain boundaries. The steel is heated at temperatures from the (As) to about + 75°C for time periods varying from as little as one minute to 16 hours, the time being generally inversely proportional to the temperature. While this annealing procedure will produce enhanced toughness for high purity steel containing controlled low carbon contents, it will also provide steel containing a combination of high strength (greater than 90 kai) with a CVN energy absorption value at minus 50°F of greater than 30 ft./lbs. even for steels containing normal impurity levels and conventional carbon contents.
285264
Grange Raymond A.
Miller Robert L.
Borden Ladner Gervais Llp
Compagnie Miniere de L'ogooue
Uss Engineers And Consultants Inc.
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