Heat treatment apparatus, heat treatment method for steel workpiece, and hot bending method for steel workpiece

A heat treatment apparatus, comprising:

• a feed device that feeds a heat treatment workpiece downstream in a feed direction along a heat treatment workpiece pass-line;
• a heating device that includes a two-turn heating coil disposed downstream of the feed device in the feed direction, encircling the pass-line, with a filler disposed between neighboring portions of the heating coil in the feed direction such that there are no gaps between the neighboring portions;
• a cooling device that is disposed adjacent to the heating coil in a state in which there is no gap with respect to the heating coil, downstream of the heating coil in the feed direction, and encircling the pass-line;
• a gas supply device that is disposed upstream of the heating coil in the feed direction, directly connected to the heating coil and encircling the pass-line;
• and
• an elastic sealing member that is provided at an edge of an opening encircling the pass-line, the opening being provided in a feed direction upstream wall of the gas supply device.

A heat treatment apparatus, comprising:

• a feed device that feeds a heat treatment workpiece downstream in a feed direction along a heat treatment workpiece pass-line;
• a heating device that includes a heating coil disposed downstream of the feed device in the feed direction and encircling the pass-line;
• a cooling device that is disposed adjacent to the heating coil in a state in which there is no gap with respect to the heating coil, downstream of the heating coil in the feed direction, and encircling the pass-line;
• a gas supply device that is disposed upstream of the heating coil in the feed direction, directly connected to the heating coil and encircling the pass-line, and that includes a plurality of gas compartments configured by internally partitioning, via a partitioning wall, the gas supply device in the feed direction;
• and
• an elastic sealing member that is provided at an edge of an opening encircling the pass-line, the opening being provided in a wall dividing the plurality of gas compartments of the gas supply device.