| 摘要 |
PROBLEM TO BE SOLVED: To produce superhigh purity carbon steel whose strength and elongation can be controlled to wide ranges only by the control of production conditions such as heat treatment. SOLUTION: This steel has a steel composition containing, by mass, 0.02 to 0.8% C, and the balance Fe with inevitable impurities controlled to <=100 ppm. Additionally, one or more kinds selected from <=50 ppm Si, <=50 ppm Mn, <=50 ppm Al, <=50 ppm B, <=50 ppm Cr, <=50 ppm Mo, <=50 ppm Cu, <=50 ppm Ni, <=50 ppm Nb, <=50 ppm Ti and <=50 ppm V are further incorporated therein.
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