Description
HRC 70 degree super hard chainsaw file is generally made of carbon steel by rolling, forging, annealing, grinding, cutting teeth and quenching. T12 steel is used for the super hard chainsaw sharpener which is HRC 70 degree.The super hard chainsaw sharpener which is HRC 70 degree with relatively better quality is made of bearing steel of national standard, steel No. GCr15, with electric furnace quenching technology, the hardness can reach HRC 65-HRC 67 degree, and its basic feature is sharp and durable.The specification of HRC70 degree super hard chainsaw file is divided by size, and the length is generally 250mm, in which the length of HRC70 degree super hard chainsaw file body is 200mm; the diameter is 4.0mm, 4.5mm, 4.8mm, 5.16mm, 5.5mm, 6.3mm, 7.0mm, 7.9MM, etc., in which 4.0mm, 4.8mm, 5.5mm file is the common diameter of HRC70 super hard saw file.HRC70 degree super hard chainsaw file has very high hardness, generally around HRC 62 degree to HRC 67 degree. The normal material is the material with the highest carbon content of T12 or T13, which are two kinds of carbon tool steels. The state of the super hard chainsaw sharpener which is HRC 70 degree is very brittle. When it is used, it is not allowed to use it as a hammer or crowbar. It is also normal that the phenomenon of fracture caused by high drop occurs in normal operation. It is not appropriate to use it as a daily tool. Generally, the hardness of steel file is above HRC 60 degree. From the aspect of chemical composition, the carbon content is very high, generally it needs to reach 1.0 ~ 1.3% carbon content, and it must be heat treated at the same time, otherwise, even if the carbon content is high, it can not reach that high hardness. In general, the heat treatment of quenching + low temperature tempering is usually adopted, so that the martensite structure with high hardness can be obtained and the high hardness can be maintained. Because the carbon content of super hard chainsaw sharpener which is HRC 70 degree is relatively high, it reflects that the specific application is "wear resistance" is high, that is, the heat resistance is strong. So its purpose is to grind off the metal surface, not to cut. The characteristics of super hard chainsaw sharpener which is HRC 70 degree for hardness inspection are: easy to operate, easy to carry, not limited by the size and shape of the work piece, rapid detection, and good reliability. Therefore, in the production practice, the super hard chainsaw sharpener which is HRC 70 degrees are often used to detect the work piece whose shape is not suitable for testing by the hardness tester and the work piece whose surface has decarburization.The hardness of super hard chainsaw sharpener which is HRC 70 degree inspection is applicable to the quality inspection of all kinds of steel after heat treatment. The commonly used steels include structural steel, alloy structural steel, carbon and alloy tool steel, high-speed steel, mold steel and carburized steel, etc.; the heat treatment process includes common quenching, high-frequency quenching, vacuum quenching, carburizing, carbonitriding, nitriding, etc. In addition, it is also suitable for the quality inspection of steel parts, especially in the mass production process, the hardness of products with a certain percentage is often sampled and tested with a hardness tester, and the rest products are 100% fully inspected with the super hard chainsaw sharpener which is HRC 70 degree.The hardness test with super hard chainsaw sharpener which is HRC 70 degree began in 1950s in China. Later, in the mechanical industry standard general principles for hardness test of steel heat treatment parts, it is allowed to test the surface hardness of steel quenched, tempered parts, carburized and nitrocarburized parts and nitrided parts with file test hardness method.
