Inconel 600 is an alloy. It’s a solid solution of its elements and cannot be strengthened by heat treatment. UNS chemical composition designation is N06600. This Cold working will result in increased strength. Heat treatment can remove any undesirable effects of cold work.
Typical Room temperature mechanical properties in the annealed condition are yield strength 30 to 50,000 psi, tensile strength 80 to 100,000 psi, elongation 35 to 55%. Density is .306 pounds per cubic inch.