Duplex steel/Super duplex steel stainless steel pipe

2025-02-27

Duplex steel and super duplex steel Stainless steel pipe as an important material in the field of modern industry and construction, because of its excellent properties and a wide range of applications. With its unique duplex structure, this type of stainless steel pipe shows significant advantages in terms of strength, corrosion resistance and economy.

What is Duplex steel/Super Duplex Steel?

Duplex Stainless Steel (Duplex Stainless Steel) is a combination of austenite and ferrite structure characteristics of stainless steel, usually the structure of the austenite and ferrite ratio of close to 50:50. This structure makes the duplex steel not only have the high toughness and good corrosion resistance of austenitic stainless steel, but also have the high strength and stress corrosion resistance of ferritic stainless steel.
Super Duplex Stainless Steel (Super Duplex Stainless Steel) is an upgraded version of duplex steel, which is further optimized in chemical composition and adds higher content of alloying elements such as chromium, molybdenum and nitrogen, thus showing more excellent characteristics in corrosion resistance and mechanical properties. Super duplex steel is often used in more demanding environments, such as Marine engineering, chemical equipment and other fields.

Duplex steel/Super duplex steel Main features of stainless steel pipe

1. High intensity
The stainless steel pipe strength of duplex steel and super duplex steel is significantly higher than that of ordinary austenitic stainless steel. This high strength characteristic allows the wall thickness to be reduced in the design, thereby reducing material cost and weight.
2. Excellent corrosion resistance
Duplex steel has excellent resistance to pitting corrosion, crevice corrosion and stress corrosion cracking, especially in chlorine-containing environments. Super duplex steel also shows excellent corrosion resistance in extreme corrosive environments.
3. Good welding performance
Duplex steel and super duplex steel stainless steel pipe has good welding performance, suitable for a variety of welding processes, while still maintaining its excellent mechanical properties and corrosion resistance after welding.
4. Economy
Compared with other high-alloy materials, duplex steel and super duplex steel show obvious advantages in long service life and low maintenance costs due to their high strength and corrosion resistance, thus having a high cost performance.

Application field

Due to their unique performance characteristics, duplex/Super duplex stainless steel pipes are widely used in many industries:
1. Oil and gas industry
Duplex steel/Super Duplex steel Stainless steel pipes are commonly used in media pipelines containing hydrogen sulfide, carbon dioxide or chloride, as well as subsea oil pipelines and other scenarios.
2. Chemical and petrochemical industries
Duplex/Super duplex steel is ideal for equipment dealing with corrosive chemicals, acidic solutions or high temperature and pressure environments.
3. Ocean engineering
Due to its excellent salt spray corrosion resistance, super duplex steel is widely used in offshore platforms, ships, seawater desalination equipment and other fields.
4. Paper and pulp industry
Duplex steel stainless steel pipe can effectively resist the corrosion of strong acidic or alkaline media produced in the pulping process.
5. Buildings and Infrastructure
In Bridges, building structures, and water treatment systems, duplex/super duplex steel is widely used for its durability and low maintenance costs.

Future development trend

With the continuous progress of industrial technology and the increasing requirements for environmental protection, duplex steel and super duplex steel stainless steel pipes will usher in greater development opportunities in the future. The development of new alloy components will further enhance its performance and enable it to function in more demanding environments. At the same time, with the improvement of the production process, its cost is expected to be further reduced, thus expanding its market application range.

On the whole

Duplex steel/Super Duplex steel Stainless steel pipe with its excellent performance and diverse application scenarios, has become an indispensable material in modern industry. Whether in the depths of the ocean or in chemical plants, this material is tough and reliable, providing a strong guarantee for human production and life. In the future, with the development of science and technology, more innovations and breakthroughs will emerge in this field, injecting new vitality into the global industrial development.