Gas Nitriding Furnaces by Therelek Engineers
The nitriding process is the phenomenon of diffusing nitrogen into steel and subjecting parts of special steel to the action of ammonia at a temperature normally in the range of 500 to 530°C. The duration of treatment is greatly in usually much more than the common level while in carburizing. In this regard, it should be noted that the normal time for nitriding is usually 90-96 hours.
On the other hand, Gas nitriding produces a very case brittle for most applications. Gas nitriding of tool steels is limited to applications such as hot work tool steels (H grades) and tooling for aluminium extrusion dies.
A very popular method of increasing tool life is the process of liquid nitriding of the finished high-speed steel tools in cyanide-base salt baths at 510 °C to 565 °C (950 to 1050 °F). This provides a light case, increasing both surface hardness and resistance to adhesion. This method requires a time range of 15 min to 2 hours, which creates cases with depths up to about 0.05 mm (0.002 in.). The sources for liquid nitriding are going scarce because of prevailing environmental issues.
The treatment of the finish-ground tool in an alkali-nitrate bath or steam oxidation produces oxide coatings that prevent adhesion of the tool along the workpiece. This is possible because the oxide coatings have doubled tool durability, particularly in the machining of gummy materials like soft copper and nonfree-cutting low-carbon steels.
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