Description:

Duplex stainless steel 2205 standard number: ASTM A240/A240M--01 duplex stainless steel 2205 alloy is a duplex stainless steel composed of 22% chromium, 2.5% molybdenum and 4.5% nickel-nitrogen alloy. It has high strength, good impact toughness and good overall and local stress corrosion resistance.

 

Application field：

l Pressure vessels, high-pressure storage tanks, high-pressure pipes, heat exchangers (chemical processing industry).

l Oil and gas pipelines, heat exchanger fittings.

l Sewage treatment system.

l Pulp and paper industry classifiers, bleaching equipment, storage and processing systems.

l Rotary shafts, press rolls, blades, impellers, etc. under high-strength and corrosion-resistant environments.

l Cargo boxes of ships or trucks

l Food processing equipment

 

Corrosion resistance

lUniform corrosion

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

lLocal corrosion resistance

The content of chromium, molybdenum and nitrogen in 2205 duplex stainless steel makes it highly resistant to pitting and crevice corrosion in oxidizing and acidic solutions.

lStress corrosion resistance

The dual-phase microstructure of stainless steel helps to improve the stress corrosion cracking resistance of stainless steel.

In the presence of certain temperature, strain, oxygen and chloride, austenitic stainless steel will undergo chloride stress corrosion.

Because these conditions are not easy to control, the use of 304L, 316L and 317L is restricted in this regard.

lAnti-corrosion fatigue

The high strength and corrosion resistance of 2205 duplex steel make it have high corrosion fatigue strength. Processing equipment is susceptible to corrosive environments and loading cycles,

and the characteristics of the 2205 are very suitable for such applications.

 

 

Figure 1. (a) Particle size distribution analyzed with laser particle sizing and (b) scanning electron

microscopy (SEM) secondary electron image of the powder showing the particle morphology.

Table 2. Optimal selective laser melting (SLM)-processing parameters determined through the

production pre-trials.

 

 

Note: If the alloy powder has moisture absorption, or the storage period exceeds 3 months, it should be used before

Carry out drying treatment (150℃, heat preservation for 2 hours)