Abstract
In the previous report, the quality standards of the KS-50 commercially pure titanium sheet were clarified, and the result of the analysis of variance for regression of yield strength and elongation upon tensile strength was mentioned.
In this paper, the statistical analysis, by use of the control charts, is made on tensile strength, yield strength and elongation of the KS-50 commercially pure titianium sheet, which is manufactured from approx. 30tons of ingots produced by the high vacuum arc melting furnace of large capacity.
It was found out from the analysis that the variance within heats is less than that between heats. Then, those variances were analysed statistically, and the technical consideration was added to the conclusion.
