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Hardness Testing on Tubes

Hardness testing on pipes and large pipes are performed primarily to examine two aspects: Testing of weld seams and determination of the basic hardness of the pipe

Testing and determining the hardness average value of the pipe wall

One aspect of hardness testing is the testing and determination of the hardness average value of the pipe wall after manufacture. Pipes are manufactured using a wide variety of methods, among them rolling processes. Since rolling is a thermo-mechanical process with which mechanical characteristics, along with the pipe wall thickness and diameter of the pipes, can be tested, hardness testing is used for fast determination of mechanical-technological properties.

Determining the grain structure of metallographic constituents with hardness tests

Another aspect of hardness testing is the determination of the grain structure by performing hardness tests on metallographic constituents. Due to the small size of metallographic constituents, hardness testers with small to very small forces are used—generally speaking, stationary microhardness testers with indention sizes and depths that can be adjusted via the indention force to the dimensions of the metallographic constituents.

Testing of Weld Seams

The ZwickRoell product portfolio offers hardness testers and instruments for all test methods. ZwickRoell hardness testers and devices meet the requirements of all common international standards and can also be calibrated to international standards. As a calibration lab, ZwickRoell is accredited for the calibration of hardness testers by the German national accreditation body DAkkS.

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