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Heanjia Super-metals Co., Ltd.
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Product (745)
- Pure Nickel Products (38)
- Incoloy Products (74)
- Inconel Products (72)
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FeCrAl Product
(99)
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Nichrome Products
(68)
- Monel Products (36)
- Hastelloy Products (49)
- Nickel Iron Alloy Product (59)
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Nickel Copper alloys
(47)
- Nonferrous Metal Product (27)
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Resistance Wire
(90)
- Stainless Steel Product (48)
- Mesh Demister (20)
- Others (18)
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Quality Certificate (11)
Learning Gallery (30)
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Titanium News (2)
Nickel News (8)
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nickel chrome copper iron alloys news (28)
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Company Info
Heanjia Super-metals Co., Ltd. [China (Mainland)]
Business Type:Manufacturer, Trading Company
City: Beijing
Province/State: Beijing
Country/Region: China (Mainland)
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Jialiang Zhao:
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Learning Gallery
Selecting the Suitable Resistance Wire
The furnace's working environment has effect on the performance and service life of heating alloys such as Nichrome alloys and Fe Cr Al alloys. Xinxing Nickel Wire Mesh Factory conducted research on the following different gases.
1. Dry air and pure oxygen. Nichrome alloys and Fe Cr Al alloys have best oxidation resistance when they are used in dry air condition; also in pure oxygen atmosphere. The former is much better.
2. Gases contain sulphur. Usually some gases contain sulphur impurity, and some material and oil cause sulphur pollution when furnace is made. In this atmosphere, nichrome alloys have a worse performance than Fe Cr Al alloys. The surface of nichrome alloy heating elements will form a melting zone when used at high temperature and in gases contain sulphur. And sulphur will permeate into nichrome alloys through the melting zone. Finally austenite grain boundary will be occupied by sulphide.
3. Nitrogen. The service life of Fe Cr Al alloys will be much shorter when they are used in nitrogen rather than air. This is because Element chromium and aluminum have a strong affinity with nitrogen. Layer of oxidem will be destroyed to form oxide, besides aluminum will be separated from alloy and form nitride.
4. CO and CO2. When used in a carbon atmosphere, the layer of oxidem can protect the element from carbonization if the operation temperature is not high. The performance of both kinds of alloys will fall when the temperature goes higher. Because layer of oxidem is been destroyed and form carbide. If we continue to use, the element can be cracked or even burn out.
