Heat treating is an essential phenomenon that is very much needed to manipulate the physical, as well as sometimes the chemical properties of a metal. Heat Treatment of ferrous alloys, involves heating and quenching of the related material at extreme temperatures to get the desired result, such as the hardening and softening of the same material. The size and composition of these crystallites play a pivotal role in determining the overall behaviour of the related metals. The process of heat treatment is designed to manipulate these governing properties of the metal through controlling the rate of diffusion or cooling. Heat treatment is basically used for improving or restoring the manufacturability of a product. Some of the most common forms of heat treatment methods include annealing, hardening, precipitation, case hardening, selective hardening, ageing and stress relieving.

High Speed Tool Steel has very high carbon and vanadium contents for for exceptional abrasion resistance. It is well suited for premium cutting tools of all types, particularly those used for machining abrasive alloys, castings, and heat-treated materials. The high carbon content of this grade allows it to be hardened in excess of 65HRC. However, the high hardness and high vanadium carbide content make it more difficult to grind after heat treatment Tungsten high-speed tool steels are primarily used for cutting tools such as broaches, chasers, cutters, drills, hobs, reamers, and taps.
All high-speed tool steels depend on the solution of various complex alloy carbides during austenitizing to develop both their heat-resisting qualities and cutting ability. These carbides do not dissolve to any appreciable extent unless the steel is heated to temperatures approaching the melting point of the steel.

Tool steels are important materials and cover a wide range of compositions from simple plastic molding die steels or water-hardening carbon steels to very highly alloyed high-speed steels. Even more exotic compositions can be achieved by the powder metallurgy route, Tool steels usually contain significantly more alloying elements than alloy steels. Approximately 70 types of tool steels are available in India. The reason for so many types of tool steels is evolutionary development over a period of many years and the wide range of needs that they serve. Tool steels have properties that permit their use as tools for cutting and shaping metals and other materials both hot and cold. The tool steels are grouped into seven major groups, and subdivided into subgroups.
They are Water - Hardening, Shock-resisting, Cold-work, Hot-work, High-speed, Mold, Special-purpose If we are to see the true microstructure of steels, such as tool steels, we must properly prepare them. We are instrumental in providing our clients with an extensive range of hardening Tool Steel The clients can avail this steel in round, flat and square shapes, at affordable prices. Our range is procured from reliable vendors, who use quality raw material and technologically advanced machines for manufacturing the products.

Processes available with us :

Increased ductility, toughness, and strength at a given hardness.
Reduced distortion, which lessens subsequent machining time, stock removal, sorting, inspection,        and scrap.
The shortest overall time cycle to through-harden within the hardness range of 35 to 55 HRC, with    resulting savings in energy and capital investment.
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.

MARTEMPERING also known as ‘marquenching’, this treatment uses an elevated temperature quench. Components are heated to the austenitizing temperature range and quenched, normally in molten salt at a temperature above the martensitic transformation start point (Ms). Components are held in the quenching medium for sufficient time until the temperature of the component is uniform and then air cooled through the martensite formation range.
This is effectively a harden and temper operation at the same time, keeping distortion to a minimum. Subsequent tempering is carried out to improve the materials toughness.
Advantages:

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.

Alfanit Nitriding (Liquid Nitriding ) for Wear Resistance on finished components:
Alfanit is a Liquid Nitriding or Nitrocarburizing and Surface Hardening process used on fully finished    components.
Alfanit improves the life of the Ferrous Components especially on Engineering Parts, Sothat the    warranty claims can be reduced.

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.

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.

QPQ Corrosion Resistance is also known as Quench Polish Quench, Arcor, Knitcor Introduction : Corrosion can be prevented by various methods. One of them is to convert the surface layer of the metal to form a layer of Oxides. The process of corrosion, by virtue of the chemical reaction by the Oxidants with activators, forms Oxides of the corresponding metal and ultimately the material is destroyed. Knitcor process gives excellent resistance against Wear & Corrosion, Scuff, Fatigue etc. on Ferrous components and Safeguard from the destruction of the components. We have talented wide acknowledgment as a notable organization of the business offering high-class.

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.

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.

We are a coveted organization that is engaged in offering Copper Heat Treatment Services to customers. Our professionals work in close proximity with customers to render these services as per their choices and preferences. Furthermore, our quality controllers stringently check the entire treatment process on different parameters to ensure about flawlessness.

We are engaged in undertaking Aluminum Heat Treatment Services for our clients. Heat Treatment of aluminum alloys, employed to increase strength and hardness of the precipitation-hardenable wrought and cast alloys by Solutionising and Precipitation Hardening. These usually are referred to as the "heat-treatable" alloys to distinguish them from those alloys in which no significant strengthening can be achieved by heating and cooling. The latter, generally referred to as "non-heat-treatable" alloys, depend primarily on cold work to increase strength. Heating to decrease strength and increase ductility (annealing) is used with alloys of both types; metallurgical reactions may vary with type of alloy and with degree of softening desired. Except for the low-temperature stabilization treatment. We use technologically advanced furnaces while executing this job work.
 

Martensitic or quench hardening, neutral hardening is a heat treatment used to achieve high hardness / strength on steel. It consists of austenitising, quenching and tempering, in order to retain a tempered martensite or bainite structure.teel can be treated by intense heat to give it different properties of hardness and softness. This depends on the amount of carbon in the steel (only high carbon steel can be hardened and tempered). Tempering is a low temperature (150°C to 650°C) heat treatment intended to remove the stresses and brittleness caused by quenching and to develop the required mechanical properties.

Spheroidize annealing is beneficial when subsequent machining and/or hardening is required (since the microstructure consists of rounded cementite particles in a ferrite matrix). The spheroidized condition is the true equilibrium state of the steel and is its softest condition. The spheroidized microstructure also ossesses good cold-forming characteristics. Generally, the larger the spheroids and the more distance between them, the greater the ability of the steel to be cold formed. The importance of prior condition in spheroidize nnealing applies to all steels regardless of carbon content, and the presence of coarse pearlite is ndesirable because of resistance to spheroidization

Solution Annealing of stainless steel is a process which takes the carbides that have precipitated in the grain boundaries and dissolves then into the surrounding matrix. The austenitic stainless steel castings are typically solution annealed at temperatures more than 1040º C and rapidly cooled to prevent a repeat of carbide precipitation in the grain boundaries. Some alloys due to their low carbon content do not need a solution anneal due to carbide formation, but benefit from a solution anneal to achieve maximum corrosion resistance.

A full anneal typically results in the second most ductile state a metal can assume for metal alloy. It creates a new uniform microstructure with good dynamic properties. To perform a full anneal on steel for example, steel is heated to 50°C above the austenic temperature and held for sufficient time to allow the material to fully form austenite or austenite-cementite grain structure. The material is then allowed to cool slowly so that the equilibrium microstructure is obtained. In some cases this means the material is allowed to air cool. In other cases the material is allowed to furnace cool. The details of the process depend on the type of metal and the precise alloy involved. In any case the result is a more ductile material but a lower yield strength and a lower tensile strength. This process is also called LP annealing for lamellar pearlite in the steel industry as opposed to a process anneal, which does not specify a microstructure and only has the goal of softening the material. Often the material to be machined is annealed, and then subject to further heat treatment to achieve the final desired properties.

NORMALISING is a heat-treating process that is often considered from both thermal and microstructural standpoints. In the thermal sense, normalizing is an austenitizing heating cycle followed by cooling in still or slightly agitated air. Typically, the work is heated to a temperature about 55 °C above the upper critical line of the iron - iron carbide phase diagram, that is, above Ac3 for hypoeutectoid steels and above Acm for hypereutectoid steels. To be properly classed as a normalizing treatment, the heating portion of the process must produce a homogeneous austenitic phase (face-centered cubic, or fcc, crystal structure) prior to cooling

STRESS-RELIEVING process is used to relieve stresses that remain locked in a structure as a consequence of a manufacturing sequence. This definition separates stress-relief heat treating from postweld heat treating in that the goal of postweld heat treating is to provide, in addition to the relief of residual stresses, some preferred metallurgical structure or properties. For example, most ferritic weldments are given postweld heat treatment to improve the fracture toughness of the heat-affected zones . Moreover, austenitic and nonferrous alloys are frequently postweld heat treated to improve resistance to environmental damage.

Zinc Phosphate Coating Services is applied when increased corrosion resistance is required. Zinc phosphate withstands 240 hours of neutral salt test.A wide range of coating weights may be obtained : from very thin fine crystal films to heavy deposits with weight up to 4 g/ft2 (40 g/m2).
The coating color is gray of different tins : from light to dark. Finer zinc phosphate crystals produce darker color. Dark gray color is also characteristic for the high carbon steel substrates.
Zinc phosphate coatings may be applied by using immersion or spray technique.
Light and medium weight zinc coatings do not require substrate surface activation. The substrate surface should be acid activated prior to heavy coating deposition. Zinc phosphate is used not only for non-coated Steels and cast irons but also for galvanized (zinc plated) steel parts.
 

Manganese phosphating is applied when wear resistance and anti-galling properties are required. Manganese phosphate also possesses the ability to retain oil, which further improves anti-friction properties and imparts corrosion resistance to the coated parts.Magnesium phosphating typically have black color with a slight brown tint, intensity of which depends on the content of manganese oxide in the coating. Manganese phosphate is applied by immersion method. The substrate surface should be acid activated prior to coating. The coating weight is typically in the range 500-4000 mg/ft2 (5-40 g/m2). Because of their good anti-friction properties and corrosion resistance iron phosphate coatings are widely used for combustion engine parts (camshafts, piston rings, cylinder liners, gear parts), weapon mechanisms and other parts working with friction. Oil treatment is commonly employed as post treatment.

ron phosphating is applied when strong adhesion of a subsequent painting is required. In contrast to the solutions for Zinc phosphate and Manganese phosphate coatings, in which the metal ions are a constituent of the composition, to the iron phosphate solution iron ions are provided by the dissolving substrate. Iron phosphate coatings have very fine Grain structure. Iron phosphate is translucent therefore its color depends on the steel surface quality. The common color is blue or bluish-brown.Iron phosphate is applied mostly by spray (threestage or five-stage) method but immersion technique is also used. The coating weight is typically in the range 20-100 mg/ft2 (0.2-1.0 g/m2).

Blackodising Corrosion Resistance is a conversion coating formed by a chemical reaction produced when parts are immersed in the alkaline aqueous salt solution operated at approximately 135º C. The reaction between the iron of the ferrous alloy and the hot oxide bath produces a magnitite (Fe3 O4) on the actual surface of the part. It is possible to oxidize non-ferrous metals under suitable conditions to form black oxides. It is possible to apply black oxide at room temperature, however it is not possible to achieve all of the benefits available from the "hot" oxide process. The cold black oxide process routinely shows color variation from part to part and the black material frequently rubs off in your hands.

Industries and applications:

Railway - gearboxes, wheels, transmissions
Machine tools - lathe gearboxes, mills

Steel works - roll bearings, roll neck rings
Power generation - various generator components

Cement Industries rollers
Rerolling mill rollers

Automotive starter rings onto flywheels
Timing gears to crankshafts

 Motor stators into motor bodies
Motor shafts into stators

Description / Specification of Thermal Shrink Fitting Services

We are involved in offering a wide range of Thermal Shrink Fitting Services to our most valued clients. Our range of these are widely appreciated by our clients which are situated all round the nation. We offer our range of it at most affordable prices.

We introduce ourselves as an eminent trader and supplier of an extensive array of  Thermal Shrink Fitting Services. Prior to dispatch, our quality controllers run numerous tests on the entire range on various parameters of quality and durability. The offered equipment is manufactured using superior quality components with the aid of sophisticated techniques at the vendors' end. Moreover, our precious clients can purchase it in different technical specifications at reasonable price from us within promised time frame.
Features:

Sturdy design
Highly durable
Application specific design 

• Chemical Analysis
• Corrosion Testing
• Fatigue Testing and Fracture Toughness
• Mechanical Testing
• Metallography
• Physical Testing

Furnaces of this type have a movable bottom (car). The car goes out of the furnace and may be loaded or unloaded with treated parts. The heating method may be either electric resistance or fuel/gas. Car bottom furnaces are suitable for various heat treatment operations of large and heavy parts.

Furnaces of this type have a mesh belt conveyor moving through a long tube like furnace. The heating method may be either electric (resistance or induction) or fuel/gas. Belt furnaces are suitable for heat treatment of relatively small parts.

Salt baths have many advantages over other heat treatment processes, viz Rapid rate of heat transfer in the salt bath gives higher output Uniform and accurate control of temperature can be available through out the bath and the components.
A)SALTS FOR CARBURISING
ALFA CARB –I
Salt for Carburising with Working Range 760°-950°C ( ICI Equivalent –`Rapicarb-H’ )
ALFA CARB –II
Salt for Carburising with Working Range 800°-950°C (ICI Equivalent - `Rapicarb-S’ )