Rockwell & Vickers Hardness Tester in Chennai

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The Rockwell method is the most universal because it uses both a penetrating diamond cone and a penetrating steel ball to measure the hardness of a material. The steel ball is used with softer materials. But be careful, the softer the material, the larger the diameter of the ball must be and the lower the total load. Ball indenters with a large diameter are used to test plastic materials.

Advantage of Rockwell Hardness Tester

The Rockwell test is generally easier to perform, and more accurate than other types of hardness testing methods. The Rockwell test method is used on all metals, except in conditions where the test metal structure or surface conditions would introduce too many variations; where the indentations would be too large for the application; or where the sample size or sample shape prohibits its use.

• It is the only method that offers measurements without optical equipment, which means this solution can be made automatic and faster.
• This method is less sensitive to imperfections in the sample.
• It can be used to measure cylindrical, spherical or conical samples.
• It is fast because the measurement cycle is short.

Vickers Hardness Tester

The Vickers method is a microhardness testing technique. It is similar to the Brinell method. It is suitable for all solid and metallic materials and for all hardness ranges from 10 kgf to 100 kgf. The difference between the Vickers method and the Brinell method is that the latter uses a diamond penetrating pyramid with a square base and a fixed load. An optical instrument measures the impression. This technique allows light test loads as well as macro loads up to 30 kg.

Advantage of Vickers Hardness Tester

The Vickers method is based on an optical measurement system. The Microhardness test procedure, ASTM E-384, specifies a range of light loads using a diamond indenter to make an indentation which is measured and converted to a hardness value. It is very useful for testing on a wide type of materials, but test samples must be highly polished to enable measuring the size of the impressions.

• The measuring range is very wide. This method can be used to test all types of materials, whether they are particularly soft or hard.
• The test is easy to perform.
• The calculations are independent from the size of the diamond pyramid.
• The same indenter can be used to measure materials of a different hardness.
• This technique is perfect for laboratory tests.

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