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Kylermixon's interactive graph and data of "Hardenability Curve for 4140 Steel" is a line chart, showing Col2; with Distance from Quenched End (sixteenths of an Inch) in the x-axis and Rockwell Hardness C Scale in the y-axis.. The x-axis shows values from 0 to 22. The y-axis shows values from 30 to 60.