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Quantitative ratings based on a standard "100%" baseline (typically 12117 or 1212 steel) to help predict how easily a material can be cut or finished.
"Estimated Mechanical Properties and Machinability of Steel Bars," sae j1397 pdf
Carbon. C % 0.370 - 0.440. Manganese. Mn % 0.700 - 1.000. Phosphorus. P % 0.030 max. Sulphur. S % 0.050 max. Iron. Fe % Balance. - Gravity Group of Companies Quantitative ratings based on a standard "100%" baseline