2205 stainless steel is a duplex stainless steel, which is a composite stainless steel composed of 22% chromium, 2.5% molybdenum and 4.5% nickel-nitrogen alloy. Standard number: ASTM-A240/A240M-01. It has high strength, good impact toughness and good overall and local stress corrosion resistance.
C≤0.030 Mn≤2.00 Si≤1.00 p≤0.030 S≤0.020 Cr 22.0～23.0 Ni 4.5～6.5 Mo3.0～3.5 N0.14～0.20 (austenite-ferrite type)
The yield strength of 2205 stainless steel is more than double that of ordinary austenitic stainless steel. This feature allows designers to reduce weight when designing products, making this alloy more price advantageous than 316 and 317L.
2205 stainless steel has excellent resistance to stress corrosion cracking. Even the duplex stainless steel with the lowest alloy content has a higher resistance to stress corrosion cracking than austenitic stainless steel, especially in environments containing chloride ions. Stress corrosion is a prominent problem that is difficult to solve for ordinary austenitic stainless steel. The corrosion resistance of 2205 duplex stainless steel, which is the most commonly used in many media, is better than that of ordinary 316L austenitic stainless steel, while super duplex stainless steel has extremely high corrosion resistance. In some media, formic acid, etc. can even replace high corrosion resistance. Alloy austenitic stainless steel, and even corrosion-resistant alloys.
