Special heat treats furnaces called “nitriding furnaces” are used for nitriding. These ovens use active nitrogen at precise temperatures to harden the metal, resulting in durable, long-lasting products with excellent wear resistance and fatigue strength for nitride hardening furnaces and ferrous materials, including alloy steel, titanium, brass, zirconium, and stainless steel.

Nitride hardening, facilitated by the Gas Nitriding Furnace, is a versatile process integral to manufacturing a wide range of products, including but not limited to aeroplane parts, medical devices, and power plant components. You may improve the quality and durability of your ferrous products by investing in gas-nitriding furnaces.

In gas nitriding, a type of heat treatment for steel, nitrogen-rich gas is dispersed across the surface of the metal using heat from a gas furnace. A portion of the metal below the surface can retain its malleable condition because the nitride hardening process is incorporated into the bulk material.

Gas Nitriding Furnace: Why It Matters So Much!

Specialized heat treatment furnaces called “nitriding furnaces” are constructed for nitriding. These furnaces heat the parts in a controlled environment, including active nitrogen. In addition, this process hardens the metal, producing strict, wear-resistant goods with high fatigue strength and lasting long in service.

For heat-treating ferrous materials, such as zirconium, titanium, brass, alloy steel, and stainless steel, the nitride hardening furnaces produced by the Gas furnace manufacturers are put to good use. Gas Nitriding Furnace Exporters in India can advise you on which kind of furnace is best for your needs and help you load or unload your products.

Types of Gas Nitriding Furnace:

The size of the load, the size of the work chamber, the type of equipment needed, and the number of pieces of equipment are all factors that may be determined using this data.

Pit Furnaces

This type of furnace has a removable top, so a crane can be used to bring in and take out baskets or fully laden fixtures. Sometimes, two detachable retorts and two cooling stands are used in a system to maximize output. This setup allows for the emptying and loading of one answer while the other is still in the pit furnace. Pit furnaces make long, heavy, and repetitive processing much more accessible. Problems with installation due to low ceiling height are familiar with these setups.

Bell Furnaces   

This furnace comprises the following parts: a fixed base, a heating bell, a cooling bell, and a retort. The furnace might have two floors and responses to double the output. A significant benefit of this technique is that a pit is rarely necessary. But it needs a lot more headroom than a pit furnace does.

Box Furnaces

This Industrial Furnace can be loaded and unloaded horizontally through either a vertical lift or a side-swing door. They are both customary and independent units. When utilised in conjunction with a powered load-transfer cart, the roller rails and chain guides of an internal-quench furnace line can be thought of as functionally equivalent to the supports for a high workload. The use of a forklift can be made easier if the furnace is independent and has alloy skid rails.

Gas Nitriding Furnaces Equipment Features

Many batch furnaces, such as a bell, integral quench, box, pit, and tip-up, are suitable for nitriding and nitrocarburizing. These batch furnaces are all somewhat similar in design, and their shared features are outlined below.

  • Sealed Work Chamber

Since ammonia is circulated through the furnace, an airtight working environment is necessary. A retort is a type of gas furnace typically housed inside a giant furnace. Inconel 600, 601, and other stainless steels are commonly used to fabricate retorts. Essential parts of the answer must not come into contact with the ammonia lest it absorbs the atomic nitrogen they need.

For this reason, a seal is crucial. Leaks are dangerous because they compromise the nitride case and could endanger the workers. Extremely high concentrations of raw ammonia (above 50 ppm) can cause eye irritation, shortness of breath, and other health problems. There is also the possibility of explosions if the conditions are right. Water tracing is typically used to remove heat from the area and protect the seal.

  • Circulation

Fans are needed to move the nitriding processing gases and to evenly distribute the heat from the heat source to the workpiece, as gas nitriding is performed in the convection temperature range. The output is a consistent caseload throughout the board. Depending on the furnace and load setup, the location could be above the load, below the load, or in a separate heating chamber.

  • Radiant Heater

Both gas and electric heating systems can be found in nitriding furnaces. Both methods necessitate protecting the heat source (gas burners or electric components) from contact with the processing gas. Furthermore, the risk of overheating makes direct radiation a less-than-desirable feature. The heat source can be placed anywhere in the chamber if the furnace has a retort. Other than that, radiant tubes are another option.

  • Structure for Cooling

Gas furnace may be cooled with a variety of methods. The first variety has a heat exchanger and fans cooled by water. The blower, in this scenario, works by sucking air from the furnace, passing it through the heat exchanger, and then blowing it back into the stove. An alternative cooling method for retort furnaces involves using a fan to circulate air through the cavity outside the retort. An external cooling platform and blower setup are sometimes used instead of the answer.

  • Control System

Before, a gas furnace’s control system was made up of nothing more than a thermometer. The dissociation rate of ammonia had to be kept constant by manually adjusting the flow rates of the process gas based on burette readings. This may necessitate as many as twenty or more temperature and ammonia modifications per cycle.


As one of the Gas Nitriding Furnace Manufacturers in India, we are keenly aware of the ongoing need for durable, tough coatings. Our goods are built to last, and you can expect the longest possible service life with us. Maharith Thermal Pvt. Ltd. team has years of experience manufacturing batch and continuous machinery. We produce batch furnaces of the gas furnace variety for ammonia-related activities.