Carbonitriding & Tempering

A process called gas Carbonitriding in Pune is very similar to carburizing, except that nitrogen is introduced into the atmosphere in very minute amounts, and the temperature is lowered. Because of this, the case depth and, by extension, the load-carrying capacity are reduced, but the wear resistance and dimensional control are frequently improved over carburizing. As a bonus, carbonitriding may be done on unalloyed steels, meaning it can be utilized to affordably produce vital, wear-resistant parts from small stampings or other types of machined parts.

Liquid Carbonitriding:

Liquid carbonitriding treats a component by dousing it in a molten liquid containing carbon and nitrogen to enrich the surface layer by diffusion.The temperature is raised to between 820 and 860 degrees Celsius to complete the procedure. A hard, wear-resistant casing (often between 0.075 and 0.75 mm in depth) is what carbonitriding is used for. The carbonitrided case is less likely to harden than one that has been carburized (nitrogen increases the hardenability of steel; it is also an austenite stabilizer, and high nitrogen levels can result in alloy steels). Therefore, a hardened case can be manufactured using either carbon or low-alloy steel at a reduced cost by Carbonitriding &Tempering in Indiaand quenching within the case-depth range provided. Oil quenching, or in some cases gas quenching using a protective environment as the quenching medium, can restore total hardness with little deformation.

The beneficial effects of heat treatment in salt baths:

Quickly warms up. Heat is delivered to an object submerged in molten salt by conduction (together with convection) through the liquid (salt bath). Compared with radiation and convection through a gas, the heat transmission rate in a liquid medium is dramatically higher (e.g, air).

Metals can be subjected to various heat treatments, including hardening, austempering, carburizing, gas nitriding, liquid nitriding, oxidizing, steaming, annealing, normalizing, precipitation hardening, induction hardening, nitro carburizing, carbonitriding.

The quenching process was conducted under carefully monitored and controlled conditions of cooling. Typically, water or oil is utilized as the quenching medium in a traditional quenching process. Cracks and deformities could form due to the rapid cooling rate given by water or oil. In molten salt, cooling gradually ceases at a lower temperature.

Methods of carbonitriding

Carbon and nitrogen are incorporated into the surface of the component at the same time during the thermochemical treatment known as (austenitic) carbonitriding. Components are less likely to become warped because the operation is carried out at lower temperatures and generally for shorter times than carburizing. Diffused nitrogen stabilizes austenite and reduces the critical quenching speed, making the steel less hardenable. Oil quenching, rather than the more severe water quenching required for mild steel, can be used to minimize distortion. To carbonitride plain carbon steel or low alloy steel, the surface is typically treated with 0.5 to 0.8% carbon and 0.2-0.4% nitrogen at a temperature of 820 to 900 degrees Celsius in a gaseous atmosphere. A direct oil quench follows the diffusion period for the parts. The carbonitriding depth, hardening temperature, quench rate, steel hardenability, and component dimensions all have a role in determining the maximum case-hardened depth (CHD) that may be achieved. For the larger case depth range, the heat treatment is finished with low-temperature tempering between 150 and 200°C to reduce brittleness, depending on tribological circumstances.