High-strength electric resistance welded steel tube and production method therefor
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[0074]Molten steel samples indicated in Table 1 are refined in a converter and continuously casted into slabs (steels). These slabs (steels) are subjected to a hot-rolling process under conditions indicated in Table 2 to form hot-rolled sheets (thickness: 2.4 to 3.0 mm), followed by pickling. The hot-rolled sheets were subjected to a cold-rolling process of cold-rolling the sheets into cold-rolled sheets, and the cold-rolled sheets were subjected to an annealing process under conditions shown in Table 2 to form cold-rolled annealed sheets (thickness: 1.2 to 1.8 mm). As a result, materials for steel tubes were obtained. Test specimens were taken from the obtained materials for steel tubes and structural observation and a tensile test were carried out. The test methods were as follows.
Structural Observation
[0075]Test specimens for structural observation were taken from the materials for steel tubes. Sections of the test specimens taken in the rolling direction were polished, corroded ...
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