GB 3652–83
Metallic pipes are commonly used in industries ranging from construction and manufacturing to healthcare and automotive. As such, it is important that these pipes are fabricated and tested for compliance to safety standards. The GB 3652–83 standard is a national standard issued by the Chinese National Bureau of Standards, which describes the high-temperature tensile testing of metallic pipes.
The first step in complying with GB 3652–83 is to ensure that the metallic pipes are properly stored and transported. They should be stored in a cool, dry place and should not be exposed to external pressure or temperature shocks. Furthermore, the pipes should be secured properly during transportation to reduce the risk of damage as it may affect the accuracy of the test results.
The next step is to carry out the high-temperature tensile test in accordance with GB 3652–83. This requires the preparation of specimens cut from the metallic pipes. The typical specimen size used is 35mm in length with a 5mm in diameter. Depending on the purpose of the tests, larger or smaller specimens of different thickness can also be used. Peak stress is defined to be the maximum load that the specimen can withstand before it breaks, whereas peak strain is the corresponding relative displacement of the specimen.
Once the specimen is cut, it is placed in a jig and then subjected to a constant and gradually increasing tensile load that is generated electronically. The tensile load is maintained until the specimen breaks, at which point the peak stress and strain values of the specimen can be recorded. The results of the high-temperature tensile test should be compared with the required values of the applicable standard to ensure compliance.
In addition, the residual strength of the metallic pipes should also be tested after the high-temperature tensile test. This can be done by performing a tension test on specimens that are cut from the pipes after they have been subjected to high temperatures. This test measures the tensile load that the specimens can endure before they break at the given temperature.
The results of this test must be evaluated against the applicable standards and specifications to ensure that they are within the required values. The results of the tests must also be reported in the format specified by the Chinese National Bureau of Standards.
In conclusion, high-temperature tensile testing is a critical step in ensuring the safety and quality of metallic pipes. The GB 3652–83 standard provides clear guidance on how to perform the tests and interpret the results to ensure that the pipes are fit for purpose. Moreover, additional tests should be carried out to evaluate the residual strength of the metallic pipes after the high-temperature tensile tests.
