With reference to Exercise 11.36, estimate the hardness of a sheet of steel with a copper content of \(0.05 \%\) and an annealing temperature of 1,150 degrees Fahrenheit.

Data From Exercise 11.36

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11.36 Twelve specimens of cold-reduced sheet steel having different copper contents and annealing temperatures, are measured for hardness with the fol- lowing results: Copper Annealing Hardness content temperature (Rockwell 30-T) (%) (degrees F) 78.9 0.02 1,000 65.1 0.02 1,100 55.2 0.02 1,200 56.4 0.02 1,300 80.9 0.10 1,000 69.7 0.10 1,100 57.4 0.10 1,200 55.4 0.10 1,300 85.3 0.18 1,000 71.8 0.18 1,100 60.7 0.18 1,200 58.9 0.18 1,300