Ni-Hard irons

The oldest group of high- alloy irons of industrial importance

The oldest group of high- alloy irons of industrial importance, the nickel- chromium white irons, or Ni- Hard irons, has been produced for more than 50 years and is very cost- effective materials for crushing and grinding. Ni- Hard is a metal with chrome content of 1. 4% to 28% . It is an abrasive iron for low and high stress abrasion in Mining, Milling, and Earth Handling uses. It is also used extensively in the Power Plant Industry, Brick Plant Industry, Asphalt Industry, Cement Industry, and Rock Crushing Industry. The optimum composition of a nickel- chromium white iron alloy depends on the properties required for the service conditions and the dimensions and weight of the casting. Ni - Hard casting is an extremely wear resistant material and in cast form is ideal for use with abrasive products, giving a much more extended life when compared with cast iron or mild steel when incorporated in pneumatic conveying systems. Nickel content increases with section size or cooling time of the casting to inhibit pearlitic transformation. For castings of 38 to 50 mm thick, 3. 4 to 4. 2% Ni is sufficient to suppress pearlite formation upon mold cooling.