Hardness test on oil pipeline take into account its mechanical properties, this is related to the performance and quality of the oil pipe as raw material deformation, stamping, cutting and other processing. Therefore, all of the oil pipeline need to do mechanical testing. Mechanical test methods are mainly divided into two categories, one is the tensile test, another is hardness test.
Tensile test of oil pipeline made from sample to sample on a tensile tester pull to break, and then determination of one or more mechanical properties, usually only the determination of tensile strength, yield strength, and elongation after fracture and cross-section shrinkage. The tensile test is the basic mechanical properties of oil pipe material test methods, almost all of the oil pipe materials, as long as the mechanical properties required by provisions of the tensile test. Especially those that shape is not easy to for oil pipe material hardness test, tensile test to be the only means of mechanical properties testing.
The hardness test is a rigid indenter according to a predetermined condition slowly pressed into the surface of the sample, and then test the indentation depth or size, in order to determine the size of the material hardness. Hardness test is the oil pipe mechanical testing easiest, fastest and most easy to implement. Hardness test is non-destructive, Petroleum Steel Pipe hardness values and tensile strength values approximate translation. The hardness value of the oil pipe can be converted into a tensile strength values, it has great practical significance.
Since the tensile test is not easy to test, and it is very convenient to do the strength and hardness conversion, so more and more people are less oil pipe hardness testing only to test its strength. Especially because of the hardness manufacturing technology continues to progress and innovation, some of the original can not directly test the hardness of the material, such as seamless steel pipe, stainless steel plate and oil pipeline, now have may directly test the hardness. Therefore, there is a hardness test gradually replaced by the trend of the tensile test.
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