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Precision pipe 14*2 precision steel pipe precision bright steel pipe manufacturer
Precision pipe 14*2 precision steel pipe precision bright steel pipe manufacturer.Annealing is the first heat treatment method used by human beings. As early as 1000 years B.C. (about the same time as the Shang and Zhou dynasties in China), namely the bronze age, the hot-rolled seamless tube factory believed that the method of making tools, agricultural tools and weapons with metal in human production activities and improving plasticity with annealed and softened metal had been widely used at that time. In the iron age (about the 6th century B.C.), high-temperature annealing to obtain high-quality 45 × precision tube products has become a popular technology in the developed countries at that time. After the 6th century AD (equivalent to the Sui and Tang Dynasties in China), many countries used drawing technology to produce iron wire. Annealing is the heat treatment process that must be carried out to produce 20 × precision steel pipe and fine steel wire. The cold drawn seamless tube factory believes that annealing has been widely used since the 14th century (equivalent to the Ming and Qing Dynasties in China)
Precision pipe 14*2 precision steel pipe precision bright steel pipe manufacturer.Small diameter precision pipe is a kind of high precision steel pipe material after cold drawing or hot rolling treatment. Due to the fact that there is no oxide layer on the inner and outer walls of precision steel pipes, no leakage under high pressure, high precision, high finish, no deformation in cold bending, no crack in flaring, flattening, etc., the products mainly used to produce pneumatic or hydraulic components, such as cylinders or oil cylinders, can be seamless pipes or welded pipes. The chemical composition of precision steel pipe includes carbon C, silicon Si, manganese Mn, sulfur s, phosphorus P and chromium CR. Large diameter precision steel pipe with outer diameter over 95
Precision pipe 14*2 precision steel pipe precision bright steel pipe manufacturer.No. 45 should not be carburized and quenched. After quenching and tempering, the parts have good comprehensive mechanical properties and are widely used in all kinds of important structural parts, especially those connecting rods, bolts, gears and shafts working under alternating load. But the surface hardness is low, not wear-resistant. The surface hardness of parts can be improved by tempering + surface quenching. Carburizing treatment is generally used for surface wear-resistant and core impact resistant heavy-duty parts, and its wear resistance is higher than quenching and tempering + surface quenching. The surface carbon content is 0.8-1.2%, and the core carbon content is 0.1-0.25% (0.35% in special cases). After heat treatment, high hardness (HRC58-62) can be obtained on the surface, low hardness in the core and impact resistance. If No. 45 carburizing is used, hard and brittle martensite will appear in the core after quenching, which will lose the advantage of carburizing treatment. At present, the carbon content of the materials with carburizing process is not high. By 0.30% of the core strength, it can reach a very high level, and its application is rare. 0.35% has never seen an example, only in textbooks. The process of quenching and tempering + high frequency surface quenching can be adopted, and the wear resistance is slightly worse than that of carburizing. The 45 recommended heat treatment system specified in GB / t699-1999 is 850 ℃ normalizing, 840 ℃ quenching and 600 ℃ tempering. The properties reached are yield strength ≥ 355MPa. GB / t699-1999 stipulates that the 45 tensile strength is 600MPa, yield strength is 355MPa, elongation is 16%, area shrinkage is 40%, and impact energy is 39j
Precision pipe 14*2 precision steel pipe precision bright steel pipe manufacturer.
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