For petroleum coke samples, the true density of the petroleum coke measured by the comprehensive method and the national standard GB/T6155-2008 method is not much different. This is because the infiltration liquid is the same and the evaluation result is also the case where the hole is not cracked. The use of the method for testing is equivalent to improving the quality of the insulation strip. The test results show that the heat insulation strips of different manufacturers can pass the test of the method, indicating that it is feasible to use the method specified in the new GB5237.6 standard for stress cracking test of the shaft nail. This can not only promote the improvement of product quality, but also comply with the requirements of international standards.
Shaft nail stress cracking test can be used to test the adaptability of heat insulation strip during processing and use. During the test, attention should be paid to the state adjustment of the sample. At the same time, the center axis of the shaft nail hole should be perpendicular to the sample plane. The stress corrosion cracking test of the shaft nail was performed using a more severe corrosive medium and the test time was lengthened. However, the test result evaluation requirements did not change, that is, the quality requirements for the heat insulation strips were improved.
The test results show that the requirements in the new version of the standard are achievable. With respect to the determination of the xylene density, the national standard uses the pycnometer volumetric method, and compared with the comprehensive method, the secondary error also occurs. The test result of the comprehensive method is very accurate. Compared with the national standard method, there is no case where there is a large deviation due to the secondary error. Therefore, the influence of the secondary error can not be considered. It reduces the amount of xylene and also solves the problem that the sample is difficult to infiltrate. It also ensures the precision and accuracy of the test results. It is suitable for both carbon materials and other materials such as fire-resistant materials. A wide range of test methods is worth promoting in the laboratory.
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