R. Giingras, Pyromaitre Inc, St-Nicolas, QC, Canada

Summary: Tempering has for ever in terms of heat transfer been described using the convenient number one digit only. (1 hour x 1 inch section). We will in this presentation reveal the tempering CALCULATOR. A computer assisted scientific tool for calculating infinite numbers of tempering cycles and predicting hardness results for carbon steel and low alloy steel. When used in conjunction with a high heat transfer rate oven and the corresponding heat simulation software, the Calculator becomes for the heat treater ''Applied Science on his shop floor''. Controlled cycle time reduction up to 10 folds become common.