Annealing, quenching and heat treatment of steel roller
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The nature of the operations of heat treatment of steels roller
Rolls of rolling mills constantly operated under high contact pressures, which often exceeds that of the plastic limit of the treated metal. This circumstance leads to increased requirements for the strength and hardness of the rolls. Low hardness, not only distorts the size of rolled workpieces, but also leads to surface deformation and chipping roller steels in the surface layers.
For the manufacture of rolling rolls is used, the work rolls of rolling mills use steel type 55KH, 9X, 9KHF, 9X2, 9Х2В, 9Х2СФ etc. Heat treatment roller is made of steel after forging on forging hammers and consists in carrying out the quenching and subsequent tempering. The criterion of correctness of the roller heat treatment of steels is the hardness of barrel roll (HSD 90…100 shore) and a roll neck journals (35…55 HSD shore), the thickness of the hardened zone shall not be less than 5…10 mm for rolls of small size and 50…00 mm — for large rolls of rolling mills.
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Modes of heat treatment of steels roller
They are determined by the chemical composition, size and design of the rolls. With increasing number of alloying elements, the complexity of the heat treatment increases. So one-piece rolls are made from steel grades 9X, 9X2, 9KHF, 75ХМ, 65ХНМ and shrouded — steel 55KH, 50KHG, 45ХНВ, 45ХНМ.
During heat treatment take into account that most of these brands rolling of steels prone to flokirovanie, owing to their saturation with hydrogen. Therefore, before heat treatment the steel is heated to the lower range of structural transformations (use of heat in salt baths at 750…7800 C). The composition of the baths must eliminate oxidizing components, which lead to the decarbonization of the roll surface. Sometimes billets from the roller steels immersed in a borax solution.
After quenching, parts are double the vacation, and to reduce warping of the roll process is carried out under the calibration dies of the press. Holiday first performed at 450…5000 C in a nitrate or oil, and then, upon reaching the roll temperature 140…1600 C in air.
Control of lead hardness using the hardness, and the degree of carburization of the surface is checked using a calibrated file.
Buy at an economical price manufacturer of steel rolling, the company offers Electrocentury-steel. Supplier guaranteed prompt delivery of products to the address specified by the consumer.