MAHARSH METAL HEAT TREATMENT

Austempering Ductile Iron- ADI(Austempered Ductile Iron)

AUSTEMPERING is the isothermal transformation of a ferrous alloy at a temperature below that of pearlite formation and above that of martensite formation. Austempering of steel and nodular cast iron offers several potential advantages:

Processes available with us :

ADI offers this superior combination of properties because it can be cast like any other member of the Ductile Iron family, thus offering all the production advantages of a conventional Ductile Iron casting. Subsequently it is subjected to the austempering process to produce mechanical properties that are superior to conventional ductile iron, cast and forged aluminum and many cast and forged steels.
The yield strength of ADI is over three times that of the best cast or forged aluminum. In addition ADI weighs only 2.4 times more than aluminum and is 2.3 times stiffer. ADI is also 10% less dense than steel. The mechanical properties of Ductile Iron and ADI are primarily determined by the metal matrix. The matrix in conventional Ductile Iron is a controlled mixture of pearlite and ferrite. (Tempered martensitic matrices may be developed for wear resistance, but lack the ductility of either as-cast Ductile Iron or ADI). The properties of ADI are due to its unique matrix of acicular ferrite and carbon stabilized austenite; called Ausferrite.

Liquid Nitriding Services (ALFANIT, Tufftriding, Sursulf, Ferritic Nitrocarburizing)

We are renowned as one of the main Liquid Nitriding Services to our respected customers at pocket friendly rates. With the assistance of our well-informed workers, we provide services that are in harmony with the clients requirements. In addition to this, we are providing these services in changed as well as modified forms.

Advantages :

Typical Application : Automobile, Textile, Hydraulics, Heavy Machineries, Railways Military, Mining, Machine Tools Plastic, Glass, Aluminium Extrusion, Wire Cutting & Drawing, Pump, Forging, Die Casting etc.
Size - 1000 Ø X 4000 mm Length

Gas Nitriding Services

Gas Nitriding process provides several advantages for the alloys treated, such as high surface hardness, wear resistance, anti-galling, good fatigue life, corrosion resistance and improved sag resistance at temperatures up to the nitriding temperatures. Gas nitriding is typically done using ammonia with or without dilution of the atmosphere with dissociated ammonia or nitrogen (or nitrogen/hydrogen) in the temperature range of 925-1050°F (500-565°C). Ammonia (NH3) is allowed to flow over the parts to be hardened.Due to the temperature and the catalytic effect of the steel surface, the ammonia dissociates into atomic nitrogen and hydrogen in accordance with equation 2NH3 → 2N + 6H.
Size - 800 Ø X 1800 mm Length

Nitrocarburising for Wear Resistance 

Nitrocarburizing is a variation of the nitriding 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. Nitrocarburizing is a shallow case variation of the nitriding process. Advantages of the process include the ability to harden materials which are not prehardened, the relatively low temperature of the process which minimizes distortion, and relative low cost in comparison to carburizing or other case hardening processes. This process is done mainly to provide an anti-wear resistance on surface layer and to improve fatigue resistance.

Size - 800 Ø X 1800 mm Length

Gas Carbonitriding Liquid :

Gas carbonitriding is similar to carburizing, except that small additions of nitrogen are added to the atmosphere and the temperature is slightly lower. Consequently, the case depth and therefore, the load carrying capability is not as high as with carburizing, but the wear resistance and dimensional control are often superior.
Carbonitriding has the further advantage that it can be performed on unalloyed steels, so that it can be used for small stampings or other types of machined parts to make a strong, wear resistant part economically.
Size - 1500 Ø X 2800 mm Length

Liquid Carbonitriding :

Liquid carbonitriding is the process of diffusion enrichment of the surface layer of a part with carbon and nitrogen provided by a molten salt.The process is carried out at the temperatures 820-860°C
Carbonitriding is used primarily to impart a hard, wear-resistant case, generally from 0.075 to 0.75 mm deep. A carbonitrided case has better hardenability than a carburized case (nitrogen increases the hardenability of steel; it is also an austenite stabilizer, and high nitrogen levels can result in retained austenite, particularly in alloy steels).
Consequently, by carbonitriding and quenching, a hardened case can be produced at less expense within the case-depth range indicated, using either carbon or low-alloy steel. Full hardness with less distortion can be achieved with oil quenching, or, in some instances, even gas quenching, employing a protective atmosphere as the quenching medium.
Benefits of heat treatment in salt baths:

Flame Hardening :

Flame hardening in its simplest form is the heating up of steel to its hardening temperature by a flame and then quenching in water or oil. The gas used for the heating is a mixture of oxygen and usually acetylene although occasionally propane is employed. The gases are mixed in a burner unit whose shape is dictated by the part to be flame hardened.
Size- 1000 Ø X 3000 mm Length

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