Density and specific heat of roll steel. Physical and mechanical properties.
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Alloying of roll alloys
Rolling rolls of hot and cold rolling mills are characterized by a uniformly created technological processing force. They are made from a separate group of tool alloys, most often from medium-carbon steels with an increased chromium content, and for rolls of hot-rolling mills — vanadium. The ductility of such roll alloys increases nickel, and for rolling semi-finished products of increased strength, roll steels with an increased percentage of manganese, silicon and carbon are used. Supplier Avlob offers to buy roll steel at a bargain price. The price is the best in this segment of rental.
Technical specifications
Among the main advantages of rolls are:
- High hardenability after heat treatment, for which it is important to perform a full martensitic transformation at relatively low cooling rates of the blanks. This is achieved by the minimum necessary (not less than 0.55… 0.60%) percentage of carbon, as well as the presence of silicon and, preferably, boron. The continuous hardenability of the rolling roll over the entire section causes its necessary operational resistance;
- High strength with contact loads that occur in the rolling roll at the initial stages of rolling, with the rolls of the starting stands of rolling mills more than others subject to high contact stresses;
- Minimal propensity of the material to warpage and deformation during the heat treatment, which is achieved by the presence in manganese and silicon steels;
- The ability to work well on metal-cutting (in particular, grinding) machines, in order to achieve a minimum surface roughness, Achieves increased, against the usual, tolerances for the percentage of sulfur;
- The absence of solid nonmetallic inclusions (hydrides, nitrides, aluminum dioxide, etc.), which contribute to the fatigue dyeing of the material of the rolls during their operation.
Thermophysical properties (temperature 100 ° C)
steel grade | l W / (m · K) |
Chromium | 22.4 |
Molybdenum | 41.9 |
Carbon (grade 30) | 50.2 |
Carbonaceous (grade 15) | 54.4 |
Chrome-nickel-tungsten brands | 15.5 |
l — Coefficient of thermal conductivity (heat capacity of the material)
Delivery, price
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