VISHAL HEAT TREATERS

Corporate

Annealing is a heat process whereby a metal is heated to a specific temperature /colour and then allowed to cool slowly. This softens the metal which means it can be cut and shaped more easily. Mild steel, is heated to a red heat and allowed to cool slowly. However, metals such as aluminium will melt if heated for too long.

Aluminium can be annealed but care must be taken whilst heating. The flame should be held at a distance to the aluminium so that it gives a generalised heating to the metal.

A ‘trick of the trade’ is to rub soap on to the surface of the aluminium and then heat it on the brazing hearth. It takes only a short time for the soap to turn black. The brazing torch should be turned off immediately and the aluminium allowed to cool slowly. It is now annealed and should be very soft and malleable.

Gas carburising furnace is basically pit-pot type furnace used for hardening / case carburising / carbonitriding of various components made of steel such as auto parts, gears, precision turned components, construction machinery parts and any other component needing hardening. The furnace is equipped with automatic temperature control, hydraulic lifting, drip feed of carburising fluid. The furnace may be electrically heated, oil fired or gas fired.

Applications:

– Gas Carburising / Carburizing

– Carbonitriding.

– Direct Hardening.

Furnace Size : 500 mm dia X 1000 mm Depth

Gas nitriding is a surface hardening process, where nitrogen is added to the surface of steel parts using dissociated ammonia as the source. Gas nitriding develops a very hard case in a component at relatively low temperature, without the need for quenching.

Nitriding is carried out at temperatures below the transformation temperature of alloy steels, so that with proper manufacturing techniques, there is little or no distortion as a result of the process. Parts to be nitrided are heat treated to the proper strength level, and final machined. The parts are then exposed to active nitrogen at a carefully controlled temperature, typically in the range of 925°F to 985°F. This temperature is typically below the final tempering temperature of the steel so that nitriding does not affect the base metal mechanical properties. As a result, a very high strength product with extremely good wear resistance can be produced, with little or no dimensional change.

The components to be nitrided are often stress relieved prior to final machining so that the only size changes observed are growth of about 0.0005″. In some cases, nitrided components are surface ground after nitriding to remove the most outermost brittle layer produced by the process, or to bring parts into a tight tolerance.

Furnace Size : 700 mm dia X 3000 mm Depth

Gas carburising furnace is basically pit-pot type furnace used for hardening / case carburising / carbonitriding of various components made of steel such as auto parts, gears, precision turned components, construction machinery parts and any other component needing hardening. The furnace is equipped with automatic temperature control, hydraulic lifting, drip feed of carburising fluid. The furnace may be electrically heated, oil fired or gas fired.

Gas nitriding is a surface hardening process, where nitrogen is added to the surface of steel parts using dissociated ammonia as the source. Gas nitriding develops a very hard case in a component at relatively low temperature, without the need for quenching.