Medium-/high-carbon steel sheet and method for manufacturing same
2015
The medium-/high-carbon steel sheet according to one aspect of the present invention is a steel sheet containing, in mass%, C: 0.10-1.50%, Si: 0.01-1.00%, Mn: 0.01-3.00 mass%, P: 0.0001-0.1000%, and S: 0.001-0.1000%, with the remainder having components comprising Fe and impurities, wherein the total volume fraction of martensite, bainite, pearlite, and residual austenite is 5% or less, the remainder being a composition of ferrite and carbide; the spheroidizing ratio of the carbide particles is 70 to 99%, inclusive; and the number of carbide particles that include crystal interface misorientation of 5 degrees or greater, expressed as a proportion of the carbide particles, is 20% or less with respect to the total number of carbide particles.
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