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HIGH-STRENGTH STEEL TUBE HAVING EXCELLENT CHEMICAL CONVERSION TREATABILITY AND EXCELLENT FORMABILITY AND METHOD FOR MANUFACTURING THE SAME
HIGH-STRENGTH STEEL TUBE HAVING EXCELLENT CHEMICAL CONVERSION TREATABILITY AND EXCELLENT FORMABILITY AND METHOD FOR MANUFACTURING THE SAME
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机译:具有优异的化学转化处理性和优异成形性的高强度钢管及其制造方法
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摘要
There is provided a high-strength steel tube having excellent chemical conversion treatability and excellent formability and a method for manufacturing the high-strength steel tube. More specifically, in processing a mother steel sheet containing, on the basis of mass percent, 0.05% or more C, more than 0.7% Si, and 0.8% or more Mn into a pipe shape, the sum total of absolute circumferential surface strains each applied in individual process steps of the processing is 5% or more as nominal strain. A welded steel tube thus manufactured using a steel sheet even containing more than 0.7% Si can have excellent chemical conversion treatability without mechanical grinding or chemical pickling treatment.
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