Chemical composition for 2205 duplex stainless steel

Mechanical property for 2205 duplex stainelss steel

Specifications for 2205 duplex stainless steel

Applications for 2205 duplex stainless steel

Because 2205 stainless steel has high strength, good impact toughness and good overall and local stress corrosion resistance, and the yield strength of 2205 duplex stainless steel is austenitic stainless steel two times, this feature enables designers to design products lose weight, make this alloy has more than 316 317L price advantage. This alloy is particularly suitable for the temperature range of -50 DEG F/+600 DEG F. The alloy may be considered for applications beyond this temperature range, but there are some limitations, especially when applied to welded structures.

So,2205 stainless steel is widely used in our daily life such as:

1) Pressure vessels, high pressure storage tanks, high pressure pipelines, heat exchangers (chemical processing industry).

2) Oil and gas pipelines, heat exchanger tubes.

3) Sewage treatment system.

4) Pulp and paper industry classification, bleaching equipment, storage processing system.

4) High strength and corrosion resistance of the rotary shaft, press roller, blade, impeller, etc..

5) Cargo boxes for ships or trucks

6) Food processing equipment

Standards for 2205 duplex stainless steel

GB: 022Cr23Ni5Mo3N (Standards from China)

ASTM: S31803/S32205  (Standards from USA)  

DIN: W.Nr 1.4462 (Standards from Europe)

JIS: G 4305  (Standards from Japan)

The weight calculation method for 2205 duplex stainless steel

Weight(KG/PC)=thickness(mm) x width(Meter) x length(Meter) x 8.0

Small knowledge for 2205 duplex stainless steel

Advantage for 2205 duplex

1) 2205 compared with 316L alloy and 317L austenitic stainless steel, duplex stainless steel, the performance of 2205 alloy in resistance to pitting corrosion and crevice corrosion of more superior, it has high corrosion resistance, and austenite than its lower thermal expansion coefficient, high thermal conductivity.

2) Dual phase stainless steel 2205 alloy and austenitic stainless steel, its compressive strength is two times, compared with 316L and 317L, designers can reduce its weight. 2205 alloy is particularly applicable to the temperature range of - 50 degrees F/+600 degrees F, in the case of strictly limited (especially for the welding structure), can also be used for lower temperature.

Corrosion resistance for 2205 duplex stainless steel

1) Uniform corrosion

Due to chromium content (22%), molybdenum (3%) and nitrogen content (0.18%), the corrosion resistance of 2205 in most environments is better than 316L and 317L.

2) Local corrosion resistance

The content of chromium, molybdenum and nitrogen in the dual phase steel 2205 has strong resistance to pitting corrosion and crevice corrosion in the oxidizing and acidic solution.

3) Resistance to stress corrosion

Dual phase microstructure of stainless steel is helpful to improve the resistance of the stainless steel stress corrosion cracking ability. In the presence of a certain temperature, stress, oxygen and chloride, the austenitic stainless steel will be a chloride stress corrosion. Because these conditions are not easy to control, so the use of 304L, 316L and 317L in this area is limited.

4) Corrosion fatigue

The high strength and corrosion resistance of dual phase steel 2205 have high corrosion resistance. The processing equipment is easy to be affected by the corrosion environment and the load cycle, and the characteristics of the 2205 are very suitable for this application.

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