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S-590 is a precipitation-hardening alloy designed for service in the 1100 to 1400 F temperature range. Since it is a precipitation-hardening alloy, its optimum properties are obtained by a duplex heat treatment consisting of a high temperature or solution treatment followed by rapid cooling plus aging in the range of 1400 to 1500 F. Working in the temperature range of 1200 to 1500 F (often called hot-cold-working) frequently used to give additional strength to other high-temperature alloys is neither required nor recommended for S-590.