In the process of using plastic-coated seamless pipes, it is very important to conduct a reasonable hardness test, so how do we use the correct method to test the hardness of plastic-coated seamless pipes? The mechanical properties test methods are mainly divided into two categories, one is tensile test and the other is hardness test. The tensile test is to make a plastic-coated seamless pipe into a sample, break the sample on a tensile testing machine, and then measure one or more mechanical properties, usually only tensile strength, yield strength, elongation at break and cross-section. Shrinkage. Rate measures the rate. Tensile test is the basic mechanical property test method of metal materials. Tensile testing is required for almost all metallic materials whenever mechanical properties are required. Especially for those materials whose shapes are not convenient for hardness testing, tensile testing becomes a means of testing mechanical properties.
The hardness test is to slowly press a hard indenter into the surface of the plastic-coated seamless pipe under specified conditions, and then test the depth or size of the indentation to determine the hardness of the material. Hardness testing is a simple, fast and easy-to-implement method for testing the mechanical properties of materials. The hardness test is non-destructive, and there is an approximate conversion relationship between the material hardness value and the tensile strength value. The hardness value of the plastic-coated seamless pipe can be converted into the tensile strength value, which has great practical significance.
Since tensile tests are not easy to detect and the conversion of hardness into strength is convenient, more and more people are testing materials for hardness and rarely for strength. Especially due to the continuous advancement and innovation of durometer manufacturing technology, it is now possible to directly test the hardness of some materials that could not be directly tested before. Therefore, the hardness test has a tendency to gradually replace the tensile test. Tensile and hardness tests are specified in most plastic coated seamless pipe standards. For materials that are inconvenient for hardness testing, such as plastic-coated seamless pipes, only tensile tests are specified. In the seamless standard, three hardness testing methods of cloth, low, and high are generally specified to determine the hardness value of the plastic-coated seamless pipe, and only one of the three hardness values is required to be measured. Therefore, when testing the hardness of plastic-coated seamless pipes, these details need to be done to ensure their good performance.
Post time: Aug-24-2022