Difference between Duplex and Super Duplex Fasteners

Posted on

A wide range of different types of stainless steel fasteners are available, all of which share the common property of corrosion resistance. Combined with the low level of maintenance needed when working with this form of metal, this property is just one of the reasons why it is common in so many fields of application.

The distinction between duplex and super duplex fasteners.

Even if both the duplex and super duplex are a chromium, molybdenum & nickel alloy. They also have a mixed composition of austenite and ferrite, which, compared to both the individual austenitic and ferritic stainless steel groups, gives them improved mechanical and physical properties.

The major difference is the sum of chromium & molybdenum between a duplex and a super duplex steel fastener. The chromium content in stainless steel super duplex grade ranges from 24 percent to 26 percent, while the chromium content in stainless steel duplex grade could vary from 19 percent to 32 percent.

Another difference is the amount between a duplex and a super duplex steel fastener of chromium & molybdenum. The chromium content in the super duplex grade of stainless steel varies from 24 percent to 26 percent, while the duplex grade of stainless steel chromium content could vary from 19 percent to 32 percent.

The addition of nitrogen is another distinction between duplex steel and super duplex steel. The addition of nitrogen to super duplex stainless steels increases both the yield strength and the resistance to pitting. In the presence of nickel, nitrogen stabilizes the austenite effect as well.

The higher chromium & molybdenum content results in improved corrosion resistance and increased tensile strength of the super duplex grade stainless steel, which is much higher compared to duplex stainless steel.

Compared to duplex stainless steel, as super duplex stainless steel grades are heavily alloyed, they provide many benefits, such as excellent resistance to chloride stress cracking, good durability.

It is easy to weld duplex and super duplex stainless steels because both have good welding properties and can be welded by inserting filler metals. For welding, both of these stainless steel grades do not require pre and post-heat treatment.

Since both duplex and super duplex fasteners have high tensile strength compared to stainless steel of austenitic grade, it is possible to lower the consumption to design and produce a product. It is possible to thin the walls of the package, leading to a reduction in both the product’s weight and the product’s cost.

It is possible to compare the mechanical and physical properties of both duplex and super duplex steel to a superlative degree.

For example, if duplex steel’s mechanical strength is regarded as moderate, super duplex steel’s mechanical strength will be considered very high.

Although the variations between duplex and super duplex are noticeable in terms of chromium, nickel, molybdenum & tungsten material, the inclusion of these elements makes it a bit difficult to process super duplex stainless steels. These elements, applied to the super duplex stainless steel alloy, facilitate intermetallic phase formation. The impact strength of this grade can be dramatically reduced by intermetallic phases produced.

Although the content of the elements varies in the alloy in both duplex and super duplex grades, the increased tensile strength and corrosion resistance are a big difference that stands out. Therefore, as opposed to both ferritic and austenitic stainless steel grades, both these grades of stainless steel can be considered to be the strongest because of their enhanced weldability, ductility, corrosion resistance, and high tensile strength.