| Carbide Containing Surfacing Alloys |
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| Carbide containing alloys are designed for more severe abrasion resistance and offer greatly improved performance over all other alloys for low and high stress abrasion . The higher the hardness the better the abrasion resistance, but with some sacrifice in impact resistance. All carbide surfacing alloys develop transverse stress relieving cross-checks; the higher the carbon, higher hardness types develop these cracks more readily and closer together than lower carbon, lower hardness types. |
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Chromium Carbides |
| Very good abrasion resistance up to 1000ºF(538ºC). Lower hardness types can be applied in multiple layers and they provide a good combination of abrasion resistance and impact strength. Abrasion resistance is determined by the carbon content. |
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Complex Carbides |
| Combinations of Chromium, Columbium, Tungsten, Vanadium, Molybdenum or Cobalt improves overall performance over straight chromium carbides. Compared to straight chromium carbides, complex carbides also perform better at high temperatures--Postalloy 2836-SPL can be used up to 1400ºF(760ºC). |
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Tungsten Carbide |
| Use for severe low stress sliding abrasion. While tungsten carbide is an excellent abrasion resistant material, it should never be used for high temperature wear applications because tungsten carbide oxidizes at temperatures above 900ºF(482ºC), resulting in a drastic loss in wear resistance. If corrosion is a factor, choose a tungsten carbide overlay with a nickel or stainless strip instead of carbon steel. Furthermore, during the welding process particles of tungsten carbide, since they are heavier than the mild steel matrix, tend to sink to the bottom of the weld deposit so that the top portion of the deposit wears away more rapidly than the bottom. In addition, some of the tungsten carbide will be dissolved during welding. |
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