2205 stainless steel is the strongest
316L stainless steel is widely used in the chemical industry because of its excellent corrosion resistance. 316L stainless steel is also a derivative of 18-8 austenitic stainless steel, with 2~3% molybdenum added.
Nitrogen is added to 2205 duplex stainless steel to improve local corrosion resistance. Its solid solution structure contains approximately half ferrite and half austenite. Generally, the minimum phase content needs to reach 30%, so it has ferrite. Performance characteristics of bulk and austenitic stainless steels.
From the above point of view, 316L stainless steel and 2205 duplex stainless steel are two different stainless steel materials. The question is, which stainless steel material has more advantages? What about the disadvantages? Let me tell you about it below.
The differences between 316L stainless steel and 2205 duplex stainless steel are as follows:
1. The yield strength of 2205 duplex stainless steel is more than twice that of 316L stainless steel, and it has sufficient plastic toughness required for molding. The wall thickness of pressure vessels made of 2205 duplex stainless steel is 30-50% smaller than that of 316L stainless steel, which is beneficial to reducing costs.
2. 2205 duplex stainless steel has excellent resistance to stress corrosion cracking. Especially in marine environments containing chloride ions, stress corrosion is a prominent problem that is difficult to solve for austenitic stainless steels including 316L stainless steel.
3. In many media, the corrosion resistance of 2205 duplex stainless steel is better than that of ordinary 316L stainless steel, because duplex stainless steel has extremely high corrosion resistance. For example, in acetic acid, formic acid, etc., it can even replace austenitic stainless steel, and even resist corrosion. alloy. However, you still have to choose 2205 duplex stainless steel or 316L stainless steel based on environmental needs and cost.
4. 2205 duplex stainless steel has high strength and good local corrosion resistance, and its wear corrosion resistance and corrosion fatigue properties are better than 316L stainless steel.
5. The linear expansion coefficient of 2205 duplex stainless steel is lower than that of 316L stainless steel and close to that of carbon steel. It is suitable for carbon steel connections and has important engineering significance.
6. No matter under dynamic or static load conditions, 2205 duplex stainless steel has higher energy absorption capacity than 316L stainless steel, which has obvious advantages and practical application value for structural parts or pipelines to cope with emergencies such as collisions and explosions.
Having said so many of their differences, 2205 duplex stainless steel seems to have more advantages than 316L stainless steel. However, does it have any disadvantages?
GNEE Steel tells you, yes. Compared with 316L stainless steel, the disadvantages of 2205 duplex stainless steel are as follows:
1. The universality and versatility of the application of 2205 duplex stainless steel is not as good as that of 316L stainless steel. For example, only 316L stainless steel can be used in environments where the medium temperature must be controlled below 250 degrees for long-term applications.
2. The plastic toughness of 2205 duplex stainless steel is lower than that of 316L stainless steel, and the hot and cold processing technology and forming performance are also poor.
3. 2205 duplex stainless steel has medium-temperature brittleness, and the process system of heat treatment and welding needs to be strictly controlled to avoid the occurrence of harmful phases and damage to performance.
4. The main reason why duplex stainless steel is weak compared with austenitic stainless steel is that duplex stainless steel contains a large amount of ferrite structure.
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