Cold Rolled Carbon Steel Strip Coils For Saw Blades

Cold Rolled Carbon Steel Strip Coils For Saw Blades

Cold rolled carbon steel strip coils are heat treated to meet the stringent requirements of saw blade manufacture. These are used for band saws, gang saws and circular saws. This high-grade material combines soft material surfaces (decarburized) for narrow bending radii with an extremely hard material core.

This results in superior mechanical properties and excellent bending characteristics. It is available in a number of application-optimized grades.

High hardness

For the high demands of stone gang saws, it is crucial for a blade to have an exceptionally hard material. This guarantees that the cutting edge stays sharp and wear is kept to a minimum. It also avoids the material slipping during sawing, which could cause striations on the surface of the marble. This is one of the reasons why our special steel for saw blades is specially designed, according to Sereno.

Moreover, it is important that the material can be bent into tight radii. Conventional steel would break during this process, but our bainitically hardened and tempered strip is capable of it. This is because the decarburized material surfaces are softened by the annealing, but the core is still hard.

In addition, the strip is ground with extreme precision. The exact 90-degree angle of the edge is essential to ensure that the saw teeth fit perfectly into the groove on the stone gang saw. This reduces the risk of wearing down the stone and prevents striations in the marble, which are undesirable.

We offer cold rolled high carbon and low alloy (HSLA) strip with precision tolerances to the inch, millimeter and fraction of an inch. We also provide a Cold rolled carbon steel strip coils for saw blades range of cold rolled specialty alloys, which can be processed and packaged to your precise specifications. These products can be delivered in truckloads or full-length coils, depending on your needs.

Excellent bending properties

When cutting, creasing or punching paper, cardboard, leather, fabric, synthetic materials or wood, blades have to withstand very high levels of stress. Conventional hard steel materials would quickly break on the stretched edges of these tight radii. To meet this requirement, Waelzholz produces a special steel strip that can be bent by more than 90° without cracking. A precisely specified annealing time, perfectly matched temperature curves and defined water quantities are the key factors. The use of corrugated wires to insert spacer layers between the individual coils and to enable a controlled level of convection are further important factors.

HSLA strip (High Strength Low Alloy) is a unique solution for saw blades as it offers a balance of high strength and superior bendability. This is achieved through a combination of a cold reduction schedule and a specific heat treatment. Unlike conventional dual phase products, HSLA strip does not need to be re-annealed after cold rolling. This allows for faster forming and stamping processes and improved weldability.

Cold rolled steel is a highly durable material for use in band saw blades. It is produced in wide widths up to two meters in Avesta, Sweden and Calvert, USA. The material undergoes a complex Tinplate Steel Coil / Sheet process to achieve its final properties: Cleaning the metal, cold rolling and cold tempering. These processes make the steel more durable and improve its surface finish.

Excellent flatness

Whether cutting, creasing, perforating or punching paper, leather, textiles, or other materials, it is important that the saw blade’s cross-section does not change shape. This requires a high level of hardness and strength, as well as very good flatness. The ideal material for these requirements is steel strip. Waelzholz Brasmetal offers a number of application-optimized grades for bandsaws, such as cold rolled or martensitically hardened and tempered C75S carbon steel.

The flatness of these strips is achieved by means of temper passing. This process consists of compressing the flat steel under very high pressure between two work rolls in order to decrease the thickness of the steel strip by 1.5 to 2 percent, without appreciable elongation. It also increases the yield strength.

Another way to ensure that a saw blade’s cross-section remains constant is by using bimetal steel. This type of steel consists of two strips of different metals, which expand at a slower rate than the rest of the strip when heated and at a faster rate when cooled. This allows the strips to convert temperature changes into mechanical displacements.

MVSS has extensive experience in manufacturing high-quality cold rolled carbon steel strips and can deliver them in coil form for a wide range of applications. These include auto components such as washers, Circles, dowel pins, various types of springs, and horn parts. These strips are also suitable for hardware tools, saw blades, and knives.

High precision

The cutting, stamping and creasing lines for paper, cardboard, textiles and leather make very special demands on the materials used. They must be easy to bend, yet at the same time extremely rigid, so that the blade can be formed into tight radii. Conventional hard steel materials would break on the outside of these radii during forming, which makes it necessary to produce a steel strip that is capable of meeting both requirements. This is precisely what Waelzholz’s bainitically hardened and tempered steel strip for saw blades does – thanks to the open coil process in which it is annealed.

The initial form of the steel is a hot rolled coil. Following the cleaning and deburring of the material and a further reduction in thickness to the desired strip width, it is heat treated, bainitically hardened and tempered, and then cold reduced for final production. The resulting strip is characterised by a high resistance to wear, high toughness and by a low hardening drop adjacent to the butt welds.

In addition to this, the strip is characterized by its outstanding flatness and lack of warping. This guarantees perfect sawing results – even when the material is being cut into marble window sills that are only one centimeter (0,39 in) thick. Waelzholz offers this steel for saw blades in a wide range of application-optimized grades.

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