Can heat treatment of duplex stainless steel change its properties? Stainless Steels
Heat treatment of duplex stainless steel is usually restricted to their initial production. After forging or rolling, items will be subjected to a solution annealing heat treatment. By holding the item above 1040degC, the composition and microstructure normalise through the item. The hold time is dependent upon the maximum section thickness, in order to allow sufficient time for the whole item to reach the desired temperature and time. Solution annealing is then followed by a rapid quench in water, with a minimum of delay between the furnace and bath.
Stress relieving is not recommended for duplex or super duplex stainless steels given their potential to form deleterious intermetallic phases at temperatures below the solution annealing temperature.
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