Answer
When Cr is added to steel, it reacts with the oxygen that resides in the steel to prevent it from rusting. A Cr steel alloy would be used in a situation where a steel might be easily oxidized, such as if it were to come into contact with water.
Work Step by Step
When Cr is added to steel, it reacts with the oxygen that resides in the steel to prevent it from rusting. A Cr steel alloy would be used in a situation where a steel might be easily oxidized, such as if it were to come into contact with water.