Steel bar tensile strength testing machine test procedure

1. Test according to the stress loading speed and temperature specified in the standard.

2. If there is a power outage during the test, if the test has to be suspended, close the oil supply valve, open the oil return valve, turn off the power supply, continue the test after the call, and indicate in the original record. If the load exceeds the yield strength of the steel grade and the power is cut off, the test piece is not used as a basis for evaluation.

3. For metallic materials exhibiting significant yielding (discontinuous yielding), the maximum force after the yielding phase has been read from the recorded force-extension or force-displacement curve, or from the velocity disk; The metal material of the yielding (continuous yielding) phenomenon, from the recorded force-extension or force-displacement curve, or from the measuring force disk, the maximum force during the test. The maximum force divided by the original cross-sectional area of ​​the sample (SO ) tensile strength

5. If one of the following conditions occurs in the test, the test result is invalid and should be re-added to the test:

1. Improper test operation, such as the specimen clamp is biased and does not meet the requirements;

2. The sample is recorded incorrectly or the equipment malfunction affects the test result;

3. Two or more neckings appear in the sample after the test;

4. The metallurgical defects (such as delamination, bubbles, slag inclusions, shrinkage cavities, etc.) on the samples after the test shall be indicated in the test records and reports.

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