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Duplex Stainless Steel pipes are now highly popular and in common use throughout the world since they are much stronger than traditional pipes with weight saving properties. The corrosion resistance of the pipes prevents stress corrosion cracking. Companies are more inclined to purchase duplex stainless steel pipes because there is very little fluctuation in price and generally they are a more economical solution to pipe applications
Every two or three years there is a conference held on the topic of duplex stainless steel where a mountain of technical papers are presented on new grades that are evolving as technology progresses.
The concept of duplex stainless steel was initially conceived in Sweden in the 1920s but it took a further 10 years for the first cast to be made. However, duplex steel has only really been popular over the last 30 years or so, since the technology for steel making has improved especially with regard to nitrogen content control.
Standard austenitic steel such as ferritic 430 and austenitic 1.4301 (304) are quite simple to manufacture. As the names of these steels suggest, they comprise generally of one phase – ferrite or austenite. Used in a wide range of applications, these types of steel are great but they are individually weak:
The basic concept of duplex stainless steel is to produce a chemical composition that creates an equal mix of austenite and ferrite. This balance of phases provides the following:
Keep an eye on our blog as we add to our Simple Guide to Duplex Stainless Steel Pipes to learn how the ferrite and austenite balance is created and much more. In the interim if you have any questions on our products or their applications please contact us as we will be happy to share our expertise free of charge.