Circle, rod KHN60VT - ЭИ868
The circle of KHN60VT alloy has high strength and reliability. Like other Nickel-chromium alloys intended for production of parts operated at high temperatures (not above 850ºС) in aggressive chemical environments. Due to the high content of Nickel, chromium, mechanisms and parts made from this alloy have high corrosion resistance, providing increased reliability of the equipment. Such properties of the alloy ductility, resistivity, and other qualities change depending on the temperature.
|Chemical composition KHN60VT (in percent).|
|up to 63.2||26.5||up to 4||13−16||0,3−0,7||to 0.5||to 0.8||to 0.5||to 0.05||to 0.1||0,013||0,013|
Chem.the alloy composition is regulated by GOST 5632−72. The alloy is melted in open electric furnaces, which ensures a minimum content of unwanted impurities.
The properties of the circle KHN60VT
The circle has a linear expansion coefficient equal to 13.7 (1/deg K). Alloy density of 8.16 g/cm3. The mechanical properties of the circle changes depending on temperature. For example, at a temperature in the range 20 — 1000 º C resistance products Flexural will be 520 — 60 N/ sq. mm the Alloy has a coefficient of thermal conductivity in the range of 15.9 to 23.4 W/(m•deg K). This steel, due to its chemical composition has high weldability, which allows a variety of designs without the use of special processing equipment and without additional heat treatment after welding.
Circle brand KHN60VT at increased requirements to the structure site, or mechanism, is subjected to such heat treatment as heating to temp.1000 — 1200ºC with further cooling in water or air. Such heat treatment promotes the normalization of internal stresses in the alloy and increasing the strength characteristics of parts.
The surface of the circle is not susceptible to oxidation during long-term operation and high temperature. A circle of plastic and is resistant to an oxidizing atmosphere, to an atmosphere of ammonia and nitrogen. However, its main drawback is that it does not have stability in the atmosphere of sulfur compounds and sulfur. The circle has a high cost, because of the high cost of the main components — Nickel.
The successful combination of the components of the alloy, allows the use of round KHN60VT in various fields of industry. The chemical stability and strength, it is widely used in the petrochemical industry for the production of prefabricated welded structures of the ammonia synthesis. Round KHN60VT capable of ensuring reliable and continuous operation of equipment at operating temperatures above 850 °C under high pressure. The circle KHN60VT is used in metallurgy for parts of furnaces and power engineering, in power plants.
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