| 摘要 |
PURPOSE: A steel pipe material is provided which further improves the strength of the steel pipe by coating and baking or low temperature tempering the manufactured steel pipe after manufacturing the steel pipe by fabricating a plate material into a pipe with a composition of steel pipe materials being different so as to have bake hardenability. CONSTITUTION: The bake hardenable steel pipe material comprises a main constituent of Fe, 0.0020 to 0.003 wt.% of C, 0.05 wt.% or less of Si, 0.6 to 1.20 wt.% of Mn, 0.07 to 0.12 wt.% of P, 0.012 wt.% or less of S and 0.02 to 0.06 wt.% of Al. The steel pipe manufactured using a bake hardenable steel pipe material has improved tensile strength and yield strength as well as improved strength through baking. The bake hardenable steel pipe material has more improved strength compared to the strength improvement obtained during fabricating of a pipe by coating and baking or low temperature tempering the steel pipe after manufacturing the bake hardenable steel pipe material into a plate material and manufacturing a steel pipe by fabricating the plate material into a pipe.
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