Stelco Limited Pusa Road, Delhi

Stelco Limited has become one of the pioneer Manufacturers of Hardened & Tempered Medium & High Carbon Steel Strips with a combined production capacity of about 14000 MT/annum. Our products find wide applications in special industrial uses. Stelco manufactures Hardened & Tempered Steel Strips conforming to National and International Standards viz, IS: 2507, DIN 17222. BS: 1449, ASTM A-682. Medium, High Carbon and Low Alloy steel strips (Cold Rolled in-house) are Heat-treated on continuous lines to develop high hardness, toughness, tensile and spring properties. Special features:   Minimum decarburization Uniform Hardness and Texture High degree of toughness Excellent Spring Properties Precision blanking ability Minimum edge camber Flatness across width No curling     Capacity (Per Annum): Hardened & Tempered Steel Strips 14,000 MT/Annum The steel grades involved in this range of Hardened and Tempered Steel Strip products are the medium/higher carbon and alloy steels with overall carbon range being 0.45 – 1.05%. Within this range are closely defined standards such as in BS 1449 Part 1 1991, CS50, CS60, CS70, CS80, CS95 and 735A51 specifications. Globally, these would be recognized as say AISI grades 1055, 1060, 1070, 1080, 1095 and 6150 and in the relatively recent European specification EN 10132-4 as C55S, C60S, C67S, C75S, C100S, and 51CrV4.  These steels are most commonly produced with sheared edges and a slightly oxidized blue black (also called blue gray) finish, as these conditions are fully acceptable in engineering component manufacturing. Steel strip with enhanced properties can be produced by edge machining the strip, either before or after the hardening and tempering process. The edge-dressed strip is material where the edge condition from the previous slitting process has been removed, in the Company’s case by a very effective in-line, 2-sided machining process which removes the sheared edges which naturally contain a level of micro-cracks and are also of a relatively rough nature. The dressed edge confers a substantial engineering benefit in improved fatigue-resistance properties, this being of particular value in arduous spring-type applications. Applications Flat springs for automobile clutches, Wood working saws, Masonry and Agricultural tools, Gang saws blades, for marble cutting, Wood cutting Band saws, Hand Saws, Cross-cut Saws, Pit Saws, Doctor Blades, for paper industries, Leather splitting knives, Clutch plates, Brake components, Horn diaphragms, Spring & Spring Washers, Textile and Jute mill accessories, Compressor valve plates, Forge Hammer Belts,  Drop pins for textile industries, Spiral coil springs and circular saws, Tubes and non-ferrous metal cutting etc. Special Requirement: Stelco Limited can offer a complete range of Hardened & Tempered Steel Strips according to any International Standard. Buyer may furnish the following information to meet the exact requirement. Description of the product. Number of relevant International Standard. Nominal thickness and width in millimeters. Hardness Edge requirement. Required tolerance On thickness On width On edge camber Type of coil and coil internal diameter. Surface condition such as Furnace blue, Polished bright, Deep blue and Golden etc. Special requirement, if any.  

Sawing of marble, granite and other species of rocks for the building industry and other purposes is carried out to large extent in stone gangsaws with diamond segmented blades. Up to 100 saw blades can be fitted in a single set-up. The demands made on stone sawing call for straight cuts, high cutting speed and maximum utilization of the expensive diamond-segmented saw blades. STELCO Gangsaw steel meets the demands made by saw blade manufacturers and consumers on the  quality of the blade material. Some characteristic properties of STELCO gangsaw steel are:- High fatigue resistance. this is an important property, since stone saw blades  are frequently exposed  to high and varying loads as well as to vibrations i.e. high fatigue stresses. High transition temperature, resulting in less risk of undesirable martensite formation during the brazing of the diamond segments. A chemical composition which minimizes the risk of cracks in connection with brazing. Good flatness and straightness. Square, smooth edges which is a pre-requisite for strong & durable joint between the parent blade & segments.

Sawing of marble, granite and other pieces of rocks is carried out in gangsaws with diamond segmented blades. In a single set-up 100 Saw Blades can be fitted. STELCO Gangsaw steel meets the demands made by Saw Blades manufacturer and consumer on the quality of the blade material.Some of the characteristic properties of the STELCO Gangsaw Steel are:High fatigue resistance is an important property, since stone Saw Blades are frequently exposed to high and varying loads as well as to vibrations. i.e. high fatigue stresses. High transition temperature results in less risk of undesirable martensite formation during the brazing of the diamond segments. A chemical composition which minimizes the risk of cracks in connection with brazing. Good flatness and straightness.Square, Smooth edges is a prerequisite for strong and durable joints between the parent blades & segments.

Width : 12 mm-31 mm Thickness : 0.382 mm - 1.50 mm UTS : Min. 76, Max. 92 Surface : Painted / Wax Coated.

Cold Rolled Steel Strip is produced, as the term suggests by the further rolling of strip produced by the hot strip mills. Prior to cold rolling, the mill scale has to be removed, normally by the Pickling Process which uses mechanical manipulation (around small diameter rolls) and acid to dissolve the surface scale. The surface is then washed to remove the acid and a light oil added to prevent rusting. Why Cold Rolling:- Reduce the thickness Improve the surface finish Improve the thickness tolerances To offer a range of “tempers” As a preparation for surface coating     COLD ROLLING STEEL PROCESS Cold-rolling steel is the process of steel flattening by passing the steel through a series of rollers. It is called Cold Rolling (or Cold Rolled) because the steel is kept below its recrystallization temperature. Cold rolling steel makes it up to 20% stronger and improves the surface finish. Cold-rolled sheets and strips come in various conditions: full-hard, half-hard, quarter-hard, and skin-rolled. This cold rolling process and equipment change the mechanical properties of the steel, producing certain useful characteristic combinations*, including (but not limited to): DuctilityHardnessStiffnessStrength  *Based on customer requirements. We have two rolling stations. The initial cold rolling is undertaken on a more powerful “break down” mill that is capable of heavy reductions. After annealing to remove the stress and work hardening introduced in the process, the final cold rolling or “skin-pass” takes place. This is a light reduction (typically 3%) to improve the surface finish. Our Cold rolling mills are reversing mills. A reversing mill is where the steel enters the rolling mill from one side, passes through the other side and then comes back through the mill again. Normally it will go left to right through the mill a number of times being rolled a little thinner each time it goes through. Cold rolled strip can be produced in various conditions such as skin-rolled, quarter hard, half hard, full hard depending on how much cold work has been performed. This cold working (hardness) is often called temper, although this has nothing to do with heat treatment temper. In skin rolling, the metal is reduced by 0.5 to 1% and results in a surface that is smooth and the yield point phenomenon–excessive stretching and wrinkling in subsequent operations, is eliminated. This makes the metal more ductile for further forming and stretching operations. Quarter Hard, Half Hard, Full Hard stock have higher amounts of reduction, up to 50%. This increases the yield point; grain orientation and material properties assume different properties along the grain orientation. However, while the yield point increases, ductility decreases. Quarter Hard material can be bent (perpendicular to the direction of rolling) on itself without fracturing. Half hard material can be bent 90º; full hard can be bent 45º. Thus, these materials can be used for in applications involving great amounts of bending and deformation, without fracturing. Classical Cold Rolled is produced on narrow strip mills typically offering widths up to 500mm with “close” gauge control and a wide range of sizes, qualities and hardness’s. Cold rolled sheet products are available for a multitude of applications such as appliances, automobiles, agricultural tools etc. They offer better control of thickness, shape, width, surface finish, and other special quality features that compliment the emerging need for highly engineered end use applications. To meet the various end use requirements, cold-rolled sheet products are metallurgically designed to provide specific attributes such as high formability, drawability, high strength, high dent resistance, enamelability, and paintability. The first step in manufacturing Cold Rolled Sheet Products involves cold reducing coils of hot-rolled, pickled product to a thinner thickness. The primary feature of cold reduction is to reduce the thickness of hot-rolled coils into thinner thicknesses that are not generally attainable in the hot rolled state. The cold reduction operation induces very high strains (work hardening) into the sheet; thus, the sheet not only becomes thinner, but also becomes much harder, less ductile, and very difficult to form. However, after the cold-reduced product is annealed (heated to high temperatures), it becomes very soft and formable. In fact, the combination of cold reduction and annealing lead to a refinement of the steel that provides very desirable and unique forming properties for subsequent use by the customer. The hot-rolled, pickled coils incoming to the cold reduction mill are of excellent quality attributes. The pickling operation is well-controlled to assure that all the oxides formed during hot rolling are removed. The thickness of the hot-rolled strip is important in that the properties of the final cold rolled and annealed product is influenced by the percent of cold reduction. This means that the thickness of each hot-rolled coil is carefully controlled to provide the mill with a specific thickness to achieve the proper percent cold reduction. Among other things, the percent of cold reduction affects the forming behavior of the product after annealing. The production of a specific thickness of cold rolled sheet to meet an end user’s requirements involves sophisticated processing. Steel chemistry, hot strip mill processing variables, pickling practices, cold-rolling mill practices, annealing practices, and finally, temper rolling practices all have a role in achieving the manufacture of top quality cold-rolled sheet products. This product is manufactured for a large number of applications that require a variety of properties from fairly simple to very sophisticated. The product is typically available at thickness as low as 0.10 mm to 5.00 mm.

STELCO strip steel for the manufacture of wood bandsaws is characterized by mechanical properties combining high strength and toughness which minimize the risk of cracks in connection with spring or swage, setting good flatness and excellent straightness. Its straight and smooth edges are safe to handle.  

STELCO is a trademark and registered Bandsaw Blades. We provide STELCO Bandsaw Blades for : Wood Synthetics Soft metals Stones Food processing.STELCO Bandsaw Blades made from the best raw material with STELCO - machines which are especially accurate, reliable, and efficient. Production is based on ALBER Thermex execution which provides the bandsaw blades with higher elasticity, longer lasting tension, and higher resistance against strain.The Bandsaw Blades are included Wide Bandsaw Blades for log and wood processing with variety of wide, Bandsaw Blades for meat & bones, Thin Kerf Gangsaw Blades and trimmers for wood derivative processing such as parquet, pencils and profiles for windows.STELCO Bandsaw Blades are available in the executions toothed only, set & sharpened, in coils or endlessly welded, from 6 to 45 mm wide and from 50 to 360 mm wide.Bandsaw Blades 6 to 40 mm wideBandsaw Blades are available in the executions toothed only, set & sharpened.Most of the execution are available with hardened tooth tips. Mark "Super".Suitable use for wood synthetics, carpenters, soft metal, food industry and butchery.Made from high quality steel with RA-155, LB, ZB, RA-M4, and RA-LKBS Eber quality.Available thickness from 0.45 - 1,00 mm.Tooth form are endlessly welded- & sharpened, endlessly welded satellite-tipped & sharpened,serrated edge, combi, and konwe.