Abstract:
The strength of the X80 steel strip as made by a certain steel works is analyzed and studied by means of conducting tensile tests with test samples with different shapes and taken from different locations of the material. The result shows that the strength distribution of the strip is: transversal strength≥longitudinal strength ≥strength at 30° direction, and that among the head section, middle section and the tail section, strength of the middle is the highest, while those of the head and the tail are rather lower, indicating obviously a so-called “ef- fect of up-side-down bathtub”. Also conducted are the analysis and study for the Bauschinger Effect with test samples as taken from the steel tube and in the locations as correspondent to those of the steel strip, resulting in the conclusion that the yield strength of the steel tube as made of the X80 steel strip tends to be higher than that of the material itself.
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