The 200 series is a class of austenitic and highly corrosion-resistant stainless steel  that are characterized by having low nickel content. They're also referred to as chrome-manganese (CrMn) stainless steel.

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Although it's corrosion-resistant, the 200 series has a lesser ability than the 300 series to protect against pitting corrosion. This occurs in environments that have high moisture and chlorine contents. The 200 series also have a lesser ability to protect against crevice corrosion, which results in stagnant liquid and high acid environments. 

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Series 200 stainless steel have excellent impact resistance and toughness, however, even in low and cryogenic temperatures. They're generally harder and stronger than 300 series steels, primarily due to their higher nitrogen content which acts as a strengthener.