Capabilities - Gas Nitriding

Gas Nitriding is the process in which Nitrogen and Ammonia are diffused into a steel product at a low temperature to produce a hard case without the need for quenching from a higher temperature. Some of the improvements this brings are: higher corrosion resistance in carbon or alloy steels, (not stainless steels) increased fatigue life, increased resistance to wear, and a higher surface hardness. We typically run two different processes based upon case depth requirements. We run a shallow case nitride of .003” - .008” typical depth and a deeper one of .010” - .015” depth.  Please note that to achieve the deeper case you must start with alloy steel, i.e. 4140, 4150, 4340. Or, Nitralloy, then have it pre-treated where the part has been quenched and tempered at 1050°F minimum. This typically results in a steel hardness of 26 – 32 R/C and is the same as what the steel suppliers list as "Pre-hardened.”

Therm-Tech’s Nitriding capacities include four furnaces with such size capabilities as 32.5” diameter x 52” long or 30” diameter x 75” long.