|Grade||analogue||W. Nr.||Aisi Uns||En||Order|
|ВР5||~~WRe20||Delivery from the stock, in stock|
|ВР20||~WRe20||Delivery from the stock, in stock|
Heat-resistance of WRe20 alloys
Heat-resistance of WRe20 is a function of wolframium and rhenium. A melting point of wolframium is 3410 °C; a temperature of rimming action equals to that one which is on the Sun’s surface (6690 °C). Wolframium alloys are in a lead through all other alloys because of their refractory qualities and hardness. Rhenium comes short of its properties in relation to wolframium because its melting point is 3170 °C, a temperature of rimming action is 5870 °C. Rhenium outstrips other metals in heat resistance, a high lasting-quality, and corrosive resistance.
Special features of alloying
Tungsten-rhenium wire that is alloyed with 5% of rhenium rises a plasticity of alloy, increasing a temperature off recrystallizing. It is very important in usage for positive thermocouple electrodes. If tungsten-rhenium wire is used in a form of negative electrode, so that it is necessary to have 35% of rhenium in composition in order to make a thermal emf as efficient as possible.
Tungsten-rhenium wire is stable to helium, dry nitrogen, hydrogen, nitrogen. An alloying with silica masteralloys increases a stability two-three times as much at a thermal cycle up to 2000 °C. Detectors WRe20 can be exploited in a vacuum environment. In order to provide more effective work in a vacuum environment at temperatures of 1800 °C and more, it is necessary to use electrodes of a big diameter. WRe20 is successfully used in a form of a differential thermocouple. These can be two equal thermocouples, connected opposite one another. These thermocouples are capable of providing a measuring of temperature drop between two junction points: conventional and effective.
A reference value of thermal emf is reducing to grade 24,59 mV at a cooldown to 1600 °C. This index equals not more than 23,31 mV at a temperature 1500 °C. A level of a graded thermal emf is 21,97 mV at a temperature 1400 °C.
One of the main demerits of these alloys is a bad reproducibility of thermoelectromotive force, for which reason there is a need to group thermocouples by category А-1,2,3. The first category A-1 gives a possibility to use alloy at a max. temperature of 2200 °C; application mode of A-2 and A-3 is limited to 1800 °C. It is strictly forbidden to use a wire of different production runs because each of them has its «own» index of thermal emf. As far as rhenium and wolframium are rare metals, they are very expensive. Although a price for tungsten rhenium wire is much more than a price for thermocouples that consist of other elements, but still they are cheaper than alternative monitoring instruments for thermal cycles in similar industrial conditions.
Tungsten-rhenium wire is used in a manufacture of a converter and measuring installation. It is also used in HWR (heavy water reactor) for measuring the highest temperatures in metal industry (hot-metals). A measurement error is very small (±0,01°С) up to 2500 °C. It makes equipment for measuring HWR the most accurate in such an aggressive environment.
A standard reference table of tungsten-rhenium thermocouples at a 0 °C temperature of exposed ends.
|Temperature of a tip °С||Thermoef mV, for temperature, °С|
Tungsten rhenium wire supplier
«Auremo» company proposes to buy tungsten rhenium wire by wholesale or by instalment. There is a wide range of goods in a storage building. An optimal price from tungsten rhenium wire supplier. Buy tungsten rhenium wire right now. For wholesale customers a tungsten rhenium wire price is privileged.
Buy tungsten rhenium wire at a bargain price
«Auremo» company carries out heat-resistant alloys, rare and refractory metals on favourable terms. A tungsten rhenium wire price is conditioned by technologic details of production without including additional expenses. In a storage-building, there is a wide range of goods for scaled-up fabrications. We also have attractive terms for retail customers. On company’s web-site, you can find a price-list, a catalog of production and all information about it. A tungsten rhenium wire price depends on an extent of order and additional conditions of supply. You can easily find us through the Internet. «Auremo» company offers to make purchases by wholesale or by instalment. In this segment, «Auremo» company is a profitable tungsten rhenium wire supplier. Buy tungsten rhenium wire right now. There is an optimal tungsten rhenium wire price from a tungsten rhenium wire supplier. We are waiting for your orders.