Since the 1990s, continuous heat treatment production lines with protective atmospheres have dominated the market. Overseas, belt furnaces, shake-bottom furnaces, or casting chain heat treatment production lines with shake-bottom furnaces are widely used, with belt furnaces particularly suitable for medium and small-sized fasteners.

The SY-805-4 Belt Furnace is a continuous belt carbonitriding furnace production line developed by Taiwan's SanYong Electric Heat Machinery Co., Ltd. In addition to its excellent furnace sealing performance, it also features advanced atmosphere temperature and process parameter computer control, equipment fault alarm and display functions. In recent years, the continuous belt carbonitriding furnace has been one of the most highly regarded heat treatment equipment.

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