Compare the maximum heat shaping temperatures for quenched and tempered steel and all other steels. Which is higher?

• A. All other steels (650 C) is higher than quenched and tempered (590 C).
• B. Quenched and tempered (590 C) is higher.
• C. They are equal.
• D. All other steels are lower but not by much.

Answer: (D)

Max heat shaping temperature is the hottest temperature at which steel can be formed without losing its tempered properties. Quenched and tempered steel is designed to retain a stable, tough microstructure up to about 590 C, so its upper shaping limit is around that value. Other steels, while similar in range, generally tolerate a touch less heat before tempering effects begin to degrade properties, but the difference is small. So the higher limit belongs to quenched and tempered steel, with other steels just a little lower.