F - Mech Eng,Light,Heat,Weapons – 27 – B
Patent
F - Mech Eng,Light,Heat,Weapons
27
B
F27B 9/28 (2006.01) C21D 9/573 (2006.01) F27D 9/00 (2006.01)
Patent
CA 2607124
A continuous heat treating furnace comprising a quenching zone (11) constituting one of a plurality of furnace zones excluding the first and the last zones and adapted to quench materials by blowing an atmospheric gas and, as atmospheric gas sealing means, a roll seal room (3) disposed at an entrance and partitioned by first and second roll seal devices (4A, 4B) arranged in that order from the upstream side and a third roll seal device (4C) disposed at an exit, wherein the entrance of the first roll seal device is connected to the exit of the third roll seal device and/or roll seal rooms are connected to the upstream--most portion (6) of the quenching zone, an in-furnace hydrogen concentration being controlled to not lower than 10% in the quenching zone and to not higher than 10% in zones on the entry side of the quenching zone. The above design can provide a continuous heat treating furnace that can prevent by a simple means mixing of an atmospheric gas in the quenching zone using a gas jet cooling system with an atmospheric gas in zones adjacent to the quenching zone (heating zones and cooling zones), and an in-furnace atmospheric gas control method that can prevent nitriding.
Iida Sachihiro
Samejima Ichiro
Ueno Naoto
Jfe Steel Corporation
Robic
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