Select Page

What Is The Difference Between Duplex Stainless Steel And Stainless Steel?

When compared to austenitic stainless steel, duplex stainless steel is nearly twice as strong and offers greater resistance to corrosion, including pitting, crevice corrosion, and stress corrosion cracking, than those used in austenitic stainless steel. They are also more ductile and more durable than ferritic stainless steel.

Duplex Steel UNS S31803 Round Bars

Duplex Steel Round Bars

A super duplex stainless steel is austenitic stainless steel that has high corrosion resistance, particularly chloride stress corrosion and chloride pitting corrosion, and a much higher strength than a standard austenitic stainless steel, such as Type 304 or 316. In a round bar of 22%CR duplex stainless steel, the proof strength is at least 0.2%, which is about 450 N/mm2 and for a super duplex stainless steels bar, it is at least 550 N/mm2.

Generally, duplex steel round bars can be divided into three main groups; lean duplex round bars are made of stainless steel with 22Cr, super duplex round bars are made of stainless steel with 24Cr, and super duplex round bars are made of stainless steel with 25Cr. Even more alloyed, hyper duplex stainless steel grades have been developed, and they are primarily divided based on their alloying levels, in this case in terms of their pitting resistance equivalence number (PREN), which indicates their resistance to pitting corrosion, or their resistance to corrosion.

duplex stainless steel round bars

A Duplex Steel Bar PREN can be calculated from the formula below: PREN = %Cr + 3.3%Mo + 16%N, and sometimes an allowance for W is also made, with a factor of 1.65. The PREN for a duplex stainless steel round bar is less than 40; the PREN for a super duplex hex bar is between 40 and 45; and the PREN for a hyper duplex round bar is more than 45, whereas the PREN for a lean grade usually has a lower nickel content, which in turn makes it more affordable.

The Following Are Some Of The Characteristics Of Duplex Steel Round Bars:

  • The material has a high corrosion resistance.
  • A significant advantage of these materials is that they are highly resistant to stress corrosion cracking in chloride-containing environments.
  • A great level of resistance to pitting and crevice corrosion can be achieved with this product.
  • A very high mechanical strength can be achieved through this material.
  • Design advantages resulting from physical properties.
  • Weldability is good, with high resistance to erosion corrosion and corrosion fatigue, and good resistance to erosion corrosion.
  • This material has excellent mechanical properties that allow for lighter constructions, more compact designs, and much less welding when it comes to welding.

The Use Of Duplex Steel Round Bars In Various Applications And Industries

  • In the field of pipeline engineering, it is used extensively.
  • There are many uses for Duplex Steel Round Bars in the oil and gas industry.
  • It has become a common practice in mechanical engineering to use double steel round bars.
  • Marine companies often use Duplex Steel Round Bars in the production of shipbuilding equipment.
  • The use of Duplex Steel Round Bars for the management of wastewater is quite widespread.
  • Duplex Steel Bars are a wide range of steel products used in a variety of applications within the chemical industry.
  • Using duplex round bars in the petrochemical industry is an effective way to increase efficiency.
  • Round Duplex Steel Bars are commonly used in the power industry as a means of transmitting power.
  • In the aerospace industry, double-sided steel round bar is used to make a variety of parts and components.
  • The food industry and many others use Duplex Steel Round Bars in a variety of industries.

How Does Super Duplex S32750 Round Bar Work?

This round bar of stainless steel is called Super Duplex (UNS S32750). It is an excellent corrosion-resistant material. It has excellent resistance to pitting, crevice corrosion, and chloride stress corrosion cracking. It comes in several thicknesses and designations that are available to suit the individual needs of each industry. You can design it in any way you need, based on your specific needs.

The super duplex Round Bar can be configured in a range of diameters and finishes. Cold-finishing can be done on it or it can be ground. It can be used in a number of applications and is suitable for marine environments as well as offshore environments. 

super duplex stainless steel round bars

As we all know, Super Duplex Round Bar is an excellent anti-pitting stainless steel. It is a high-quality steel containing more nitrogen, chromium, and molybdenum than other stainless steels, which makes it ideal for a variety of applications in corrosive environments.

There are a variety of shapes available in the Super Duplex S32750 Round Bar, such as hex, flat, and square shapes. The company ensures the safety of the Super Duplex ss Round Bar during shipment. It is wrapped in plastic or foil and packaged in wooden corrugated boxes to ensure its safety during shipment.

Advantages Of Round Bars

This steel round bar is made of high quality, and it is available in various sizes and shapes as well. These round bars can be used for electrical grounding and they are also ideal for reinforcing structures in construction. In addition to corrosion resistance, these bars are also resistant to rusting and corrosion, making them an ideal solution for use in applications where moisture or other corrosion-causing substances may be present.

Corrosion Resistance:

This product is highly corrosion resistant as a general steel. Furthermore, it is highly resistant to stress corrosion cracking, crevice corrosion, and pitting corrosion, making it comparable to corrosion in marine environments. Molybdenum-rich austenitic stainless steel alloy, is commonly used in a wide range of applications. It has minimal magnetic qualities and is resistant to crevices. It has very high resistance to conditions with high concentrations of halides. In spite of the fact that the duplex material has extremely low temperatures below zero, it retains a high level of rigidity and impact resistance.

What Are The Applications Of Super Duplex Bars

The steel bars are highly resistant to high temperatures and chlorine ions and can be used for a wide range of industrial applications, including petrochemical plants, pulping and paper plants, and pulp and paper digesters. Also, these steel bars can be used to manufacture vinyl chloride monomers, which are often made with these bars.

I believe one of the most noticeable properties of this steel grade is its strong corrosion resistance in a wide range of media, as well as its excellent resistance to pitting and crevice corrosion while operating in areas with chlorides.

There are several advantages to using Super Duplex UNS Round Bars compared to ordinary austenitic steels, and one of those is its excellent corrosion resistance. Also, it demonstrates a low coefficient of thermal expansion. Super Duplex Round Bars can withstand working temperatures up to 300 degrees Celsius as well as have excellent weldability properties.

Besides being available in a variety of shapes and sizes, these steel bars are also available as threaded bar forms and flat bar forms in addition to their dimensions. In addition, they are available in a wide range of sizes that can vary in diameter from 10mm to 6000mm. The most common forms include rounds, squares, and hex. They can also come in a wide range of finishes.

There are many benefits of SuperDuplex Bars, including their strength, corrosion resistance, and low thermal expansion coefficient. This material is easily welded, but it requires filler metals. Its low machinability, along with its low machinability, makes it an excellent choice for a wide range of industrial purposes. In oil and gas processing equipment, heat exchangers, and service water systems, it is very popular.