Compared Ferritic Stainless Steel with Duplex Stainless Steel By yaang.com

High content of alloying elements, the price is relatively high, generally free of nickel ferrite. 

In summary, you can generally see the use of DSS performance and process performance of the general picture that, with its superior mechanical and corrosion-resistant comprehensive performance to win the favor of users, both to save weight, it has become an excellent resistance to save investment Corrosion Engineering.

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1. yield strength than conventional austenitic stainless steel more than twice as high, and has a plastic molding needs adequate toughness. Use of duplex stainless stee tank or pressure vessel wall thickness less than the usual 30-50% austenite is beneficial to reduce costs. 

2. has excellent resistance to stress corrosion ability to break even with the lowest amount of duplex stainless steel alloy has a higher resistance than the austenitic stainless steel Stress Corrosion Cracking of capacities, particularly in chloride ion environments. Austenitic stainless steel stress corrosion is a common problem difficult to resolve outstanding.

3. In many applications the most common medium of 2205 duplex stainless steel corrosion resistance than the average of316L stainless steel, and super Duplex stainless steel with high corrosion resistance, then a number of media, such as acetic acid, formic acid, etc. can even replace the high-alloy austenitic stainless steel, and even corrosion resistant alloy.

4. has a good resistance to localized corrosion, with the austenitic stainless steel alloy content rather than its resistance to corrosion and fatigue corrosion and wear better than the austenitic stainless steel.

5. than the linear expansion coefficient of austenitic stainless steel is low, and carbon steel close fit with the carbon steel connections, has important engineering significance, such as the production of composite boards or lining and so on. 
6. in terms of dynamic load or static load conditions, than the austenitic stainless steel has a higher energy absorption capacity, which structural parts cope with unexpected incidents such as collisions, explosions, etc., have obvious advantages of duplex stainless steel, are of practical value.

Source: Yaang Pipe Industry Co., Limited (www.yaang.com)