For tensile and hardness test requirements, the term lot applies to all tubes prior to cutting, of the same size(see 4.1.6) that are produced from the same heat of steel.
Coating thickness measurement, hardness test, humid heat resistance test, visible spectrophotometer test and so on are carry out strictly for quality assurance.
The Vickers hardness test method consists of indenting the test material with a diamond indenter, in the form of a right pyramid with a square base and an angle of 136 degrees between opposite faces subjected to a load of 1 to 100 kgf.
Hardness test for the depth and gradient of the charring layer and hardening layer, Glass, ceramics, agate, jewels, thin plastic, Black metal, nonferrous metal IC thin pieces, surface coating, laminated metal.
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