Kilowatt Hours To Heat Steel Weight of Steel Temperature Rise °F 50 100 200 300 400 500 600 °C 10 37.8 93 149 204 260 316 Lbs. Kg. Kilowatts to heat in one hour 25 11.34 0.06 0.12 0.25 0.37 0.50 0.65 0.75 50 22.68 0.12 0.25 0.50 0.75 1.00 1.25 1.50 100 45.36 0.25 0.50 1.00 1.50 2.00 2.50 3.00 150 68.04 0.37 0.75 1.50 2.25 3.00 3.75 4.50 200 90.72 0.50 1.00 2.00 3.00 4.00 5.00 6.00 250 113.40 0.65 1.25 2.50 3.75 5.00 6.25 7.50 300 136.08 0.75 1.50 3.00 4.50 6.00 7.50 9.00 400 181.44 1.00 2.00 4.00 6.00 8.00 10.00 12.00 500 226.80 1.25 2.50 5.00 7.50 10.00 12.50 15.00 600 272.16 1.50 3.00 6.00 9.00 12.00 15.00 18.00 700 317.52 1.75 3.50 7.00 10.50 14.00 17.50 21.00 800 362.88 2.00 4.00 8.00 12.00 16.00 20.00 24.00 900 408.24 2.25 4.50 9.00 13.50 18.00 22.50 - 1000 453.60 2.50 5.00 10.00 15.00 20.00 25.00 30.00