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Round, wire HN77TYUR - Ei437bu

Round, wire HN77TYUR - Ei437bu

General characteristics

The range of alloy HN77TYUR has high strength and reliability. As similar chromium-Nickel alloys, it is intended to produce parts which are operated at high temperature (up to 850ºС) in aggressive chemical environments. Due to the high content of Nickel, chromium, manufactured by the mechanisms and parts have a high corrosion resistance, providing increased reliability of the equipment. The surface of the circle is not susceptible to oxidation during long-term operation and high temperature. A circle of plastic that makes it popular in the manufacture of domestic and industrial appliances. It is resistant to oxidizing atmosphere, to an atmosphere of ammonia and nitrogen. However, its main drawback is that the circle does not have stability in the atmosphere of sulfur compounds and sulfur. It has a high cost, because of the high cost of the main components — Nickel.

The chemical composition of the alloy, in percent.
Ni Ti Cr Al Si Fe Mn Ce With P Pb B S
70 — 77,4 2.4 to 2.8 19−22 06−1,0 to 0.6 to 1 to 0.4 0,02 0,07 0,015 0,01 0,01 0,007


Steel brand HN77TYUR is smelted in open furnaces, which provides the minimum content of impurities. Percentage composition is regulated by GOST 5632−72. The circle of strength can be high and standard strength (calibrated). Welded using manual arc welding with the final heat treatment. To give greater stiffness hardening is carried out at a temperature of 1100 °C with subsequent cooling in water or air. Aging occurs at a temperature of 700 — 750 °C for 5−16 hours depending on the type of hire.

Quality circle HN77TYUR at t° 20°C:

— The ultimate short-term strength = 950 MPa;

— yield strength of 620 MPa.;

max. elongation at break — 20%;

— max. contraction is no higher than 15%;

— hardness after hardening Brinell — 255 — 321 MPa.

Mechanical properties at t°100°C:

the linear expansion coefficient of 12.67x10-6/°C;

— density of 8.18 g/cm3;

— heat capacity of 13.9 W/(m·deg);

the resistivity of 1,247, Mhmm2/m.


The basic combination of the components of the alloy, allows the use of the circle HN77TYUR in various fields of industry. Having a good combination of chemical resistance and strength, it is widely used in the manufacture of prefabricated parts and weldments of equipment for the production of ammonia, petrochemical plants. Circle HN77TYUR capable of ensuring reliable and continuous operation of structures and components at the operating temperature of 700 — 850 °C under high pressure. The circle HN77TYUR used in the production of equipment for the metallurgical complex and details of furnaces for heat treatment, power stations.

Buy at best price

LLC «AVEK global» implements of precision alloys at a bargain price. It is formed under the influence of world prices for metal without the inclusion of additional costs. Circle HN77TYUR belongs to the popular group of steel products due to its real value and variety of output options. The face of our company determines the high level of service and excellent quality products. On the website LLC «AVEK global» reflects the most current information. Our managers are always happy to help answer questions. Implementation of orders takes minimal time. Deliveries go directly from the warehouse. This gives consumers significant savings on inventory and facilities. In the absence of the basic version, the required version of the products, we can produce them according to individual order.