Duplex stainless steel is a type of stainless steel that combine for the advantages of austenitic and ferritic stainless steel. This types of stainless steels have higher chromium content, 20%-28%; higher molybdenum content, up to 5%; lower nickel content, up to 9%. Which makes it has stronger corrosion resistance and higher strength than traditional austenitic stainless steel, such as 304 or 316.
The steel grades of Duplex Stainless Steel
The common steel grades of duplex stainless steel include S31803, S32750, S32760, etc. S32750 and S32760 is a high alloy super-duplex steel, higher chromium content and molybdenum content makes they have strong resistance to pitting and crevice corrosion. They are suitable for various strong corrosion environments.
Features and Applications of Duplex Stainless Steel
1. Strong corrosion resistance: Due to higher chromium and molybdenum content, duplex stainless steel have excellent corrosion resistance, such as strong acid and alkali, particularly strong chloride corrosion resistance. Which makes it usually used for construction of ocean plat and manufacturing of seabed equipment.
2. High strength and excellent mechanical performance: Compared with the austenitic stainless steel, duplex stainless steel has higher tensile strength and yield strength. Which is suitable for manufacturing of key equipment that high strength and high pressure resistance are required, such as high pressure pipeline, valves, and storage tank, etc.
3. Despite duplex stainless steels have excellent mechanical performance, compared with the austenitic stainless steel, The toughness and plasticity of duplex stainless steel is lower. And due to their high hardness, the ductility of duplex stainless steel is poor. Which makes it difficult to process and easy to break during process. So it is not suitable for the applications where high plasticity and high ductility are required. In additions, duplex stainless steel is generally used in below 300℃ working environments. Beyond the temperature range, the performance of duplex stainless steel will decrease, even when long-term used above 250℃, the impact toughness and mechanical performance will further decrease.
We can provide high quality duplex stainless steel pipes to clients, if you are looking for duplex stainless steel pipes, please visit our website.
