Duplex Stainless Steel

Duplex stainless steel is a kind of nickel-saving stainless steels composed of the grains of austenitic and ferritic stainless steels materials. Microstructure, so it has the best comprehensive performance of the two. It not only retains the advantages of both, but also makes up for the shortcomings of the two. Its strength, chloride stress corrosion and intergranular corrosion resistance are higher than that of austenitic stainless steels.Plastic toughness and weldability are greatly improved than ferritic stainless steels.

Types of Duplex Stainless Steels

Duplex Stainless Steels mainly includes the following grades:

Features of Duplex Stainless Steels

1. Good resistance to chloride stress corrosion under low stress

2. Have good resistance to pitting corrosion

3. Corrosion fatigue and wear corrosion resistance

4. High strength and fatigue strength, good comprehensive mechanical properties

5. Good weldability, low thermal cracking tendency

6. Large thermal conductivity, small linear expansion coefficient

Applications of Duplex Stainless Steels

Due to its advantages of resistance to pitting and crevice corrosion, resistance to stress corrosion, fatigue corrosion, abrasion corrosion, and acid corrosion resistance, duplex stainless steels is mainly used in the following industries:

1. Paper industry

Duplex stainless steel is suitable for the manufacture of containers containing bleach and other corrosive liquids in the papermaking process

2. Desalination

Due to its high strength and corrosion resistance, duplex stainless steel has become the material of choice for evaporators in the desalination process

3. Chemical processing

In the industrial sulfuric acid environment, especially in the case of chlorine, the two-way stainless steel has better corrosion resistance and can relatively reduce the wall thickness

4. Transportation

In the production of chemical tankers, duplex stainless steel can reduce the weight of the hull, reduce energy consumption, and can resist corrosion.

5. Oil and gas

The development of duplex stainless steel with a PRE value greater than 40 makes it possible to manufacture pumps, pipes and manifolds that require high resistance to pitting and crevice corrosion.

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