Odesa sheet, tool steel U8A, HVG, 9XC, 5HNM, R6M5, spring-spring 65G

Hardening is carried out at a temperature of 830 degrees Celsius in oil, followed by tempering at 180°C. In such conditions, HRC reaches 61-64 units. Due to the hard outer shell and viscous core, this material can be used for parts that are subjected to sign-changing loads. Given the resistance to the formation of scale, the products can be subjected to heat treatment with a finished polished surface. The regularity of deliveries ensures the constant availability of a full assortment. The continuous operation of the mechanical cutting machine in stock to avoid unauthorized quench hardening as happens in gas cutting and obtaining the required dimensions of the workpiece is another factor for our customer to buy "iron" for mechanical engineering from us.

Excellent ultrasonic tests show the absence or very small number of small internal defects that are allowed by the standard. Steel circles are often used as blanks for metal products: shaped bars and tubular products. Hot-rolled steel circle is universal, it is used in reinforcing reinforced concrete products as an alternative to class a1 (A240) reinforcement, in construction, in mechanical engineering, shipbuilding and machine tool building, heavy industry, automotive, space industry, for the construction and strengthening of road barriers Various types of fasteners for the needs of the railway are made from hot-rolled circle: washers, spring terminals, etc. The calibrated circle, due to its resistance to adverse conditions, has become indispensable in construction in northern latitudes, and it is also used for grounding gas pipelines. Calibrated circles are widely used in design and outdoor advertising. Stainless steel circles are used in construction, often for those structures that will be subjected to aggressive conditions - increased loads and high temperatures. Stainless calibrated wheels have found their place in the automotive, aviation, shipbuilding, pharmaceutical, food and other industries, in the production of pipes and the manufacture of grinding balls. Hardening of spring steel is carried out taking into account the following parameters:
    The method of heating the metal, the nature of the cooling of the material, the ambient temperature.
    The composition of the metal, the presence and type of alloying additives, the total concentration of carbon.
    A way to maintain the desired temperature range for hardening.
    The method of cooling the material after hardening, the method of storing the material. Low-alloy steels are recommended to be heated quickly. Indeed, with slow heating, gradual evaporation of carbon occurs, which is critical for low-alloy materials. However, there is no need to overdo it with the heating rate. If the heating goes very quickly, then uneven heating of the material may occur. Because of this, the risk of the formation of various metal defects (cracks, edges, destruction of corners) increases.
The best heating method would be to use two ovens. In the first furnace, the material is gradually heated to 500-700 degrees, and then it enters the second furnace, where the final hardening takes place. It is recommended to use gas ovens for heating. However, during heating, the distribution of heat should be monitored to avoid the appearance of "thermal islands" on the metal. Electric furnaces heat up rather slowly, so their use in this case is problematic from a practical point of view. The only exception to this rule is the hardening of thin metals, which do not need additional uniform heating for obvious reasons. The holding time depends on many parameters, but the average total hardening time is 80 minutes for flame furnaces and 20 minutes for electrical installations. The shape of the product is also of some importance. When working with flat sheets, hardening can be carried out quickly. Whereas in the case of a material with a complex shape, it is recommended to perform additional heating. The best way to cool the material is in the open air. Final thermal holiday
To avoid the formation of hard martensitic fractions, it is necessary to carry out thermal tempering immediately after hardening. The temperature regime also depends on which brand of spring steel was hardened. For tempering, both flame and electric furnaces can be used. The type of furnace will also affect the duration of the tempering.