Gas carburizing

automotiveagriculturefor railway

Nitrocarburising is a variation of the case hardening process. It is a thermochemical diffusion process where nitrogen, carbon, and to a very small degree, oxygen atoms diffuse into the surface of the steel part, forming a compound layer at the surface, and a diffusion layer. Nitrocarburising is a shallow case variation of the nitriding process. This process is done mainly to provide an anti-wear resistance on the surface layer and to improve fatigue resistance. Benefits of nitrocarburising -Relative low cost; -High resistance to wear; -Excellent scuffing and seizure resistance; -Fatigue properties improved by up to 120%; -Considerably improved corrosion resistance; -Good surface finish; -Negligible shape distortion; -Predictable growth characteristics; and -Alloy substitution – plain carbon steels replacing low alloy steels. Application & materials Advantages of the process include the ability to harden materials which are not pre-hardened, the relatively low temperature of the process which minimises distortion, and relative low cost in comparison to carburising or other case hardening processes. Typical industries: Oil and gas, valve, pump, agriculture equipment, automotive, stamping, textile, extrusion and injection moulding, and firearms components. Typical parts: -Oil and gas – gears and pinion shafts -Valve components – gates, seats, balls, stems, regulator valves -Pump components – impellor housings, bodies, plungers, cylinders -Agriculture equipment – harvesting combine cutters, separators, crop transfer, chopping components -Automotive – diesel engine oil pumps, gears, crankshafts and camshafts