Computerized statistical analysis of melting and pouring variables on the production of high quality steel castings
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Important, but not statistically-significant variables. These variables have sufficiently tight control in production to guarantee a small deviation in mechanical properties. For example, percent carbon and heat treatment factors are known to be important but were not statistically significant in this study.
Important and statistically significant variables. These variables will be brought under control as required. For example, rate of rise of molten metal in the mold was an unsuspected variable that was statistically significant in this study. This variable is believed to be important because it influences the as-cast grain size.
Not important and not statistically significant variables. Some variables had quite a wide range and yet were not effective in changing mechanical properties. No new measures of control are required for this vast host of variables
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