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10 September, 03:03

There are many diferent materials available for seal faces. List the following seal face materials in order of hardness. i. e Hardest first, softest last. (a) 316 Stainless Steel (b) - Mild steel (c) - Reaction bonded Silicon carbide (d) - Tungsten carbide

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  1. 10 September, 03:10
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    Reaction bonded Silicon carbide: 2500-3500 HV

    Tungsten carbide: 1800-2500 HV.

    316 Stainless Steel: 152 HV

    Mild steel: 130 HV

    Explanation:

    In order to list those seal face materials by hardness, we look up what are the values of hardness for each material in a hardness scale.

    We are going to use Vickers scale, an indentation method of measuring hardness, it measures the deformation left in a sample by a constant compression load from an indenter (a diamond pyramid) with an adequate (to the material) force, as the result is independent from the test force.

    1. Reaction bonded Silicon carbide: 2500-3500 HV

    2. Tungsten carbide: 1800-2500 HV

    3. 316 Stainless Steel: 152 HV

    4. Mild steel: 130 HV
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