Heat Treating - 7: Testing Hardness
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WARNING: Machine tools present a safety hazard. Improper operation can result in severe injury. These topics are for non-laboratory study only and are not to be used in conjunction with the operation of any tool or machine described herein. Never use a machine tool without the supervision of a qualified instructor.
The machinist must be able to obtain a quantitative value for material hardness before machining and/or heat treating. Since hardness is the ability to resist deformation a machine that measures the slightest deformation made by a penetrator while under an applied pressure can serve as a gauge. These deformation marks are measured and then compared to a standard to determine a hardness reading.
The Brinell standard is one of the most common hardness scales. It is used primarily for soft materials such as aluminum.

The Rockwell scale (aka :Vickers") is used primarily for harder metal*s such as post heat treated tool steels.

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label: heat treating, annealing, normalizing, stress relieving,. qunench, quench temper, tool steels, hardness, Brinell, rockwell, alloyed steel, carbon contenet