Annealing, quenching and heat treatment of roll steel

Are you interested in annealing, hardening and heat treatment of roll steel? Supplier Avlob offers to buy roll steel at a bargain price. The supplier guarantees the timely delivery of products to any address in Europe or abroad. Regular customers receive a discount discount. The price is the best in this segment.

Heat Treatment of Rolled Steel

Rolls of rolling mills create a high contact pressure, which often exceeds the values of the plasticity limit of the metal being processed. This circumstance causes higher requirements for the strength and hardness of the rolls. The low hardness not only distorts the dimensions of the rolled workpieces, but also leads to surface deformation and the dying of the surface layers.

Heat treatment criteria

For the production of rolling rolls, use is made of steel alloys 55X, 9X, 9XF, 9X2, 9X2B, 9X2SF, etc. Heat treatment of roll steels is carried out after forging them on forging hammers and consists in hardening and subsequent tempering. The criterion for the correctness of the heat treatment regime is the hardness of the roll barrel (90… 100 HSD Shore units) and the roll neck (35… 55 HSD Shore units), and the thickness of the hardened zone should be at least 5… 10 mm — for small rolls and 50… 00 mm — for rolls of large rolling mills. Supplier Avlob offers to buy roll steel at a bargain price. The price is the best in this segment of rental.

Heat Treatment Modes

They are determined by the chemical composition, size and design of the rolls. With increasing number of alloying elements, the complexity of heat treatment increases. So all-rolled rolls are made of 9Х, 9Х2, 9ХФ, 75ХМ, 65ХНМ, and banded — from marks 55Х, 50ХГ, 45ХНВ, 45ХНМ. While conducting heat treatment, it is taken into account that most of the above brands of roll steels are prone to flock formation, which is explained by their saturation with hydrogen. Therefore, before heat treatment, the steel is heated up to the lower range of structural transformations (heating is used in salt baths at 750… 7800 С). The composition of the baths should exclude oxidizing components, which lead to decarburization of the roll surface. Sometimes billets of rolled steel are immersed in the borax solution.

Vacation

After hardening, the parts are subjected to a two-fold tempering, and to reduce the warping of the roll, the process is carried out under the cliches of the calibration press. Leave is performed first at 450… 500 ° С in saltpeter or oil, and then, when the roller reaches a temperature of 140… 160 ° С — in the air. Hardness control is carried out with a hardness tester, and the degree of carburization of the surface is checked using a tared file.

Delivery, price

Are you interested in annealing, hardening and heat treatment of roll steel? Buy roll steel at an affordable price from the supplier Avlob today. The price is formed on the basis of European production standards. Supplier Avlob offers to buy roll steel at the optimal price in bulk or at retail.