Corrosion resistance of alloy 2205 duplex stainless steel

Uniform corrosion

The corrosion resistance of alloy 2205 duplex stainless steel is better than that of 316L and 317L austenitic stainless steel in most environments. This is due to its chromium content (22%), molybdenum (3%) and nitrogen content (0.18%) characteristics. The presence of these elements makes 2205 maintain good corrosion resistance in a variety of environments.

Local corrosion resistance

The content of chromium, molybdenum and nitrogen in alloy 2205 duplex stainless steel makes it have strong resistance to point corrosion and gap corrosion in oxidizing and acidic solutions. This alloy is particularly suitable for the -50°F/+600°F temperature range. Applications beyond this temperature range can also consider this alloy, but there are some limitations, especially when applied to welded structures.

Brand story

HTIGER is a company specializing in providing a wide range of stainless steel products, including 200 series, 300 series, 400 series, duplex stainless steel, special stainless steel, precipitation hardened steel, corrosion resistant alloy, superalloy, nickel alloy, precision alloy, etc. Our supply chain spans the globe and our wide range of products includes sheet, strip, tube, bar, coil, forgings, wire and more.

Alloy 2205 duplex stainless steel

Alloy 2205 duplex stainless steel is composed of 22% chromium, 3% molybdenum and 5-6% nickel nitrogen duplex stainless steel. It has high strength, good impact toughness and good overall and local resistance to strong corrosion. Compared with 316L and 317L austenitic stainless steel, 2205 alloy in the resistance to point corrosion and gap corrosion performance is better, it has a high corrosion resistance, compared with austenite, its coefficient of thermal expansion is lower, higher thermal conductivity.

General attribute

Alloy 2205 duplex stainless steel is composed of 22% chromium, 3% molybdenum and 5-6% nickel nitrogen duplex stainless steel. It has high strength, good impact toughness and good overall and local resistance to stress corrosion. Compared with 316L and 317L austenitic stainless steel, 2205 alloy in the resistance to point corrosion and gap corrosion performance is better, it has a high corrosion resistance, compared with austenite, its coefficient of thermal expansion is lower, higher thermal conductivity.

This alloy is particularly suitable for the -50°F/+600°F temperature range. Applications beyond this temperature range can also consider this alloy, but there are some limitations, especially when applied to welded structures.

Stress corrosion resistance

The biphase microstructure of stainless steel helps to improve the resistance to stress corrosion cracking. At a certain temperature, tension, oxygen and chloride presence, austenitic stainless steel will have chloride stress corrosion. Because these conditions are not easy to control, the use of 304L, 316L and 317L is limited in this regard.

Corrosion fatigue resistance

The high strength and corrosion resistance of 2205 alloy make it have high corrosion fatigue resistance. Processing equipment is susceptible to corrosive environments and loading cycles, and the 2205 features are ideal for such applications.