Are you interested in annealing, hardening and heat treatment of roll steel? The supplier Evek GmbH offers to buy roll steel in any quantity at an affordable price in a wide range. We provide product delivery anywhere in the continent. The price is optimal.

Relevance of heat treatment

Rolls of rolling mills are constantly operated at high contact pressures, which often exceed the plasticity limits of the processed metal. This leads to higher requirements for strength and hardness of the rolls. Low hardness not only distorts the dimensions of the rolled billets, but also leads to surface deformation and pitting of roll steels in the surface layers.

Fabrication of Rolled Rolls

For the manufacture of rolling mill rolls use work rolls steel type 55X, 9X, 9XF, 9X2, 9X2B, 9X2SF, etc. Heat treatment of roll steel is produced after forging at forging hammers and is to conduct hardening and subsequent tempering. The criterion for the correctness of the heat treatment mode is the hardness of the roll barrel (90...100 HSD shore units) and the crankshaft neck (35...55 HSD shore units), andThe thickness of the hardened zone should not be less than 5...10 mm for small rolls and 50...00 mm for large rolls in rolling mills. Evek GmbH offers to buy roll steel at an affordable price in a wide range. We will provide delivery of the products to any point of the continent. The price is optimal.

Heat treatment modes of roll steel

They are determined by the chemical composition, size and design of the rolls. As the number of alloying elements increases, the complexity of heat treatment increases. So, solid rolls are made of 9Х, 9Х2, 9ХФ, 75ХМ, 65ХНМ, and banded - from 55Х, 50ХГ, 45ХНВ, 45ХНМ.

Flocken preventing.

When heat treatment takes into account that most of the above grades of roll steels are prone to flaky formation, which is explained by their saturation with hydrogen. Therefore, before heat treatment steel is heated to the lower range of structural transformations (using the heating in the salt baths at 750 ... 780 ° C). The composition of baths should exclude oxidizing components that lead to decarburization of the surface of the roll. Sometimes workpieces of roll steels are immersed in a solution of borax.

Hardening and tempering

After hardening, the parts are tempered twice. This process is carried out under the dies of the quenching press to reduce roll warpage. Tempering is carried out at first at 450 ... 500 ° C in saltpeter or oil, and then, when the roll reaches a temperature of 140 ... 160 ° C - in the air. Hardness is checked with a hardness tester, and the degree of surface carburization is checked with a calibrated file.

Buy. Supplier, price.

Are you interested in annealing, hardening and heat treatment of roll steel? The supplier Evek GmbH offers to buy roll steel in any quantity at the manufacturer's price. We provide product delivery anywhere in the continent. The price is optimal. We invite you to partner cooperation.