Induction Hardening Company

We offer Carbonitriding heat treatment service, which is mainly preferred in designing tools, dies, crank shafts, gears, bushings, medium sized nut, bolt, gears and pivots. In this process, we make use of Pit type gas carburizing furnaces to ensure flawless service.

Carbonitriding is a process where in both carbon and nitrogen is diffused into the surface thus most suitable for low carbon alloys of steels. Alloys parts are heated in an atmosphere of hydrocarbon which consists of methane or propane and then it is mixed with Ammonia (NH3). This process is a mix of carburizing and nitriding.

When it is heated at 900 ºC, 1652ºC it is known as Carburizing whereas Nitriding is carried out at a low temperature of 600 ºC, 1112 ºF.

Carbonitriding is done at 760-870 ºC (1400 - 1598 ºF). Then after it quenched in Oxygen free atmosphere which is also known an natural gas, the Quench is little less drastic that simple water or oil thus resulting into very less distortion.

Our Carburizing service is offered in the manufacturing process of Tools, Dies, Crank Shafts, Gears, Bushings, medium sized nut, bolt, Gears and Pivots. In carburizing process, Pit type gas carburizing furnaces is used and a special refractory is also used for uniform heating and socking.  

It is a process of adding carbon to the surface by exposing the part to a Carbon rich atmosphere at an elevated temperature and allows diffusion to transfer the Carbon atoms into steel.

This diffusion will work only if the steel has low carbon content, as diffusion works on the differential of concentration principle. If, for example the steel had high carbon content to begin with, and is heated in a carbon free furnace, such as air, the carbon will tend to diffuse out of the steel resulting in Decarburization.

Gas Carburizing is conceptually the same as pack carburizing, except that Carbon Monoxide (CO) gas is supplied to a heated furnace and the reduction reaction of deposition of carbon takes place on the surface of the part. This process overcomes most of the problems of pack carburizing. The temperature diffusion is as good as it can be with a furnace. The only concern is to safely contain the CO gas. A variation of gas carburizing is when alcohol is dripped into the furnace and it volatilizes readily to provide the reducing reaction for the deposition of the carbon.

We are a reliable organization, engaged in providing Nitriding services to our clients. This process is extensively used in several components like as dies, tools, extruders, screws of plastic machinery, gears, crankshaft, camshaft, ball studs, king pins, engine valves and needle roller cages. Nitriding is mainly used to enhance the surface properties like wear resistance (400-1000%), corrosion resistance, anti scuffing and anti galling properties, fatigue strength (60-100%) etc. for any steel, cast iron or sintered iron materials.

In this process, nitrogen is diffused into surface of steel. The nitrogen forms nitrides with elements such as Aluminum, Chromium, Molybdenum, and Vanadium. The parts are heat-treated and tempered before Nitriding after that the parts are cleaned and heated in a furnace in an atmosphere of dissociated Ammonia (containing N and H) for 10 to 40 hours at 500-625 ºC (932 - 1157 ºF).

Nitrogen diffuses into the steel and forms nitride alloys, and goes to a depth of upto 0.65 mm (0.025 in). The case is very hard and distortion is low. No further heat treatment is required; in fact, further heat treatment can crack the hard case. Since the case is thin, surface grinding is not recommended. This can restrict the use of nitriding to surfaces that require a very smooth finish.

We are a trustable organization, engaged in offering Nitrocarburizing service. This process is carried out in Pit type gas carburizing furnaces to fabricate tools, dies, crank shafts, gears, bushings, medium sized nut, bolt, gears and pivots.

The diffusion process of nitrogen, carbon and small degree of oxygen is known as Thermo chemical process it is done on the surface of ferrous to form a compound layer and subsurface diffusion layer on it.

It is done in a very short period of time that too at sub critical temperatures which results into “white cast” or epsilon layer and subjacent diffusion layer that enhances the performance characteristics of the base metal material. The primary objective of nitrocarburizing process is as follows:

• Improve wear properties
• Corrosion resistance
• Improve fatigue characteristics of the metal.

Simple nitriding can be done in gas, liquid salt or plasma (electrically charged ions) environment.