High-temperature tension test of boiler plate steel according to GB/T 713-1997
High-temperature tension tests can be used to study the mechanical properties of materials at elevated temperatures, and GB/T 713-1997 specifies the test method for boiler plate steel. The test principle is simple and the test process is not complex; the procedures are clearly specified in the standard, which includes a comparison table for the specified test temperature and the corresponding wall thickness values of test pieces. This paper will focus on introducing the different provisions of the code, followed by a brief description of the test setup and testing steps, and finally a special attention to the precaution steps that should be followed during the test.
1.Scope and references
This standard applies to 7 pieced carbon steel plates and alloy steel plates for boilers and pressure vessels with a thickness of 8 mm to 150 mm. The reference documents of this code are GB/T 228-2002 Metallic materials. Tensile testing. Method of test at ambient temperature, GB/T 700-2006 Carbon Structural Steel and GB/T 1591-2008 High Strength Low Alloy Structural Steel.
2.Test Equipments and Materials
The equipments mainly include high-temperature tensile testing machine and temperature controlling device. The specimen material should use the same material as that of the boiler plate under evaluation and should conform to GB/T 700 or GB/T 1591.
3.Test Procedure
3.1 During the test, the temperature of the test section should be stabilized at the specified temperature, and the temperature should be recorded at one-minute intervals.
3.2 Before the test, the specimen should be inspected for size, surface condition, etc. The error of size should not exceed 0.4mm, and if necessary, the specimen should be corrected so that the size error is within the tolerance.
3.3 During the test, a force transducer should be attached to the specimen, and the elongation of the specimen should be recorded at one-minute intervals.
4.Precautions
4.1 Before the test, make sure that the specimen surface is clean and free of grease or other surface contaminants.
4.2 When fixing the specimen, make sure that it is in a tight state, with no looseness.
4.3 During the test, measure the specimens at regular intervals and adjust the distance between the upper and lower methods to keep them at the same level.
4.4 After the test is completed, the specimens should be carefully checked to see if there are cracks or stress-ruptures.
In conclusion, the high-temperature tensile test of boiler plate steel according to GB/T 713-1997 is a straightforward process that requires a proper setup of equipments, materials and test specimens. Following the procedures specified in the standard and taking due caution in each step can ensure repeatable and reliable test results.
