Heat treatment requiring heating, one or more times, to a specific temperature below the lower critical temperature and holding at that temperature. NOTE 1 Tempering is often preceded by quench hardening. NOTE 2 Adapted from ISO 4885.

Source: API SPEC 5CRA, Specification for Corrosion Resistant Alloy Seamless Tubes for Use as Casing, Tubing and Coupling Stock, Upstream Segment, First Edition, February 2010 (Errata August 2011). Global Standards

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