The chemical composition of 2205 duplex stainless steel can obtain an ideal microstructure of 50 α / 50 γ after solution annealing at 1900°/1922°F (1040°/1080°C). If the heat treatment temperature is higher than 2000°F, it may cause an increase in the ferrite content. Like other duplex stainless steels, 2205 alloy is susceptible to the precipitation of intermetallic phases. The intermetallic phase precipitates between 1300°F and 1800°F, with the fastest precipitation occurring at 1600°F.
2205 duplex stainless steel hot forming
When thermoforming, the entire workpiece should be heated as a whole, and it should be done in the temperature range of 1750°F to 2250°F. 2205 duplex stainless steel is very soft at this temperature. If the temperature is too high, 2205 duplex stainless steel is prone to thermal tearing. If it is lower than this temperature, the austenite will fracture. Below 1700°F, intermetallic phases form rapidly due to temperature and deformation effects. Immediately after hot forming, it should be solution annealed at a minimum of 1900°F and quenched to restore phase balance, toughness, and corrosion resistance.
2205 duplex stainless steel cold forming
2205 duplex stainless steel can be cut and cold formed. However, due to the high strength and hardness of 2205 duplex stainless steel itself, 2205 duplex stainless steel needs to be cold formed more than austenitic steel, and because of the high strength of 2205 duplex stainless steel, the springback factor must be fully considered.
Heat Treatment of 2205 Duplex Stainless Steel
Alloy 2205 should be annealed at a minimum of 1900°F, followed by rapid cooling and water quenching. This treatment is used for solution annealing and stress relief. Stress relief treatments performed at temperatures below 1900°F tend to result in the precipitation of unwanted metallic or non-metallic phases.
