Electric Heat Strips Tape N8/Ni80cr20 Nikrothal 8 Resistance Strip For Braking Resistor

Electric Heat Strips Tape N8/Ni80cr20 Nikrothal 8 Resistance Strip for Braking Resistor

The "80/20" nickel-chromium alloy in wire or strip form is used extensively as the heating element in resistance heating applications. An accepted means for evaluating the performance of a heating element is by ASTM life test B76-65. In this test, a constant temperature of 2175°F on a 0.0253 inch diameter wire, maintained by resistance heating, is applied at "2 minute on - 2 minute off" intervals until failure by burnout occurs. This life test may be significantly accelerated by raising the wire being tested to a temperature of 2200°F, while keeping all other test conditions the same. In addition, carrying out the test as a constant temperature test, by changing the power supplied to the sample during the test, is a more severe test than a constant voltage test or constant current test which have been used in the past. In a constant voltage test, the input voltage is maintained constant throughout the test. Because of high temperature oxidation, the effective diameter of the wire decreases, causing an increase in resistance. This in turn cause a decrease in electrical current flowing through the wire, because of the constant voltage. The net result is a decrease in power supplied to the wire, and a significant decrease in test temperature. Therefore, the test temperature toward the end of a constant voltage life test could be 100°F lower than the initial temperature. On this basis, the constant temperature test is much more severe than the constant voltage test and results from these tests should not be directly compared without an understanding of the boundary condition of these two tests. The average life to failure at 2200°F of a commercial 80/20 nickel-chromium alloy produced is 197 hours.

The beneficial effect of zirconium upon operating life of the 80/20 nickel-chromium alloy heating elements is known. The addition of calcium and zirconium to such an alloy increases its operating life. The addition of aluminum with calcium and zirconium to nickel-chromium-iron alloys also does the same. Subsequently the addition of calcium, aluminum and rare earths to improve life of nickel-chromium-iron alloys over lives obtainable for such alloys containing calcium, aluminum and zirconium. Zirconium has also been added to nickel-chromium-iron alloys of the superalloy type, high temperature resistant and corrosion resistant

However, the addition of zirconium to nickel-chromium alloys for the purpose of extending life of heating elements of these alloys has several attendant disadvantages, including a detrimental effect upon workability of the alloys at addition levels approaching 0.2 weight percent, loss of zirconium during charging into the alloy melt, and variations of such charge losses from melt to melt. All of these factors have led to difficulty and expense in producing heating element alloys of predictably long operating lives by the addition of zirconium.

It is felt that significant increases in the operating life of an 80/20 nickel-chromium alloy without attendant processing difficulties would enable longer life of heating elements incorporating these alloys, or alternatively enable smaller size heating elememts without a corresponding reduction in operating life, and that accordingly such increases in operating life would be an advancement in the art.

Shanghai Tankii Alloy Material Co., Ltd.specialized in production of Resistance Heating Alloy, Nickel Chromium Alloy, Iron Chromium Aluminum Alloy, Nickel Aluminum Alloy, Manganin, Copper Nickel Alloy, thermocouple wire, pure nickel and other precision alloy materials in the form of round wire, ribbon wire, sheet, tape, strip, rod and plate.

We’ve already got ISO9001 quality system certificate and approval of ISO14001 environmental protection system.

We own a complete set of advanced production flow of refining, cold reduction, drawing and heat treating etc. We also proudly have independent R&D capacity.

Shanghai Tankii Alloy Material Co., Ltd has accumulated lots of experiences over forty years in this field. During forty years, hundreds of management elites and high science and technology talents were employed.They participated in every walk of the company life, which make our company keep blooming and invincible in the competitive market.

Based on the principle of “first quality, sincere service”, our managing ideology is pursuing technology innovation and creating the top brand in the alloy field. We persist in Quality - the foundation of the survival. It is our forever ideology to serve you with full heart and soul. We committed to provide customers all over the world with high-quality, competitive products and perfect service.

Our products, such us nichrome wire, nichrome strip, fecral wire, fecral strip, thermocouple wire, nickel wire, nickel strip have been exported to Europe, USA, India, Southest Asia, South America,etc.

We are willing to establish strong and long-time partnership with our customers

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