Strong Duplex Stainless Steel – 2205

There is a powerful stainless steel that can be used under extremely harsh conditions. High temperature, high pressure, and strong corrosive environments will not change its mechanical properties and corrosion resistance. This kind of stainless steel is better than 316 stainless steel. The designer originally designed it to reduce costs, and it has been used in many great projects. For example, our Hong Kong-Zhuhai-Macao Bridge, what is this stainless steel? It is 2205 duplex stainless steel.

2205 duplex stainless steel is an austenitic ferritic duplex stainless steel composed of 22% chromium, 2.5% molybdenum, and 4.5% nickel-nitrogen alloy. It combines ferrite and austenitic It has the advantages of the whole body and has been strengthened and upgraded on top of it.
What are the advantages of 2205 duplex stainless steel?
1. The yield strength is very high, reaching 400~550 MPa, which is twice that of ordinary austenitic stainless steel, and has a price advantage over 316 and 317. It has high toughness and ductility and is generally easier to form under pressure than ferrite. The wall thickness of storage tanks and reinforced vessels made of this stainless steel is 30% to 50% smaller than that of ordinary austenite. This not only makes the product design lightweight, but also reduces costs.

2. Excellent corrosion resistance. In environments with poor media environments, such as environments with high chloride ion content in seawater, the resistance to pitting corrosion, crevice corrosion, stress corrosion and corrosion fatigue of duplex stainless steel is significantly better than that of ordinary austenitic stainless steel. . It is generally used in high-pressure storage tanks, oil and gas pipelines, marine engineering and other scenarios that require special strength and corrosion resistance. In this case, duplex stainless steel cannot be replaced by other materials.
As a stainless steel material with excellent corrosion resistance. What is the difference between 2205 duplex steel and 316L stainless steel?
The corrosion resistance of 2205 duplex stainless steel is better than that of 316L stainless steel in most environments. Especially in marine environments containing chloride ions, its resistance to stress corrosion and crevice corrosion is even better. 2205 duplex stainless steel is especially suitable for use in the range of minus -50℃~-250℃. Therefore, 2205 duplex stainless steel is preferred in environments with high corrosiveness but low temperature. However, the application fields of 2205 duplex stainless steel are not as good as 316L stainless steel, its plastic toughness is lower, and the hot and cold processing technology and forming performance are not as good as 316L stainless steel. Therefore, in actual use, appropriate materials should be selected according to specific needs and environmental conditions.