ANS:A - Martensitic steels are less susceptible to pitting corrosion than austenitic steels.

The false statement is: "Martensitic steels are less susceptible to pitting corrosion than austenitic steels." Explanation: Pitting corrosion is a localized form of corrosion that can occur on the surface of metals, particularly in environments containing chloride ions. Martensitic steels, which are characterized by a strong and hard microstructure, are generally more susceptible to pitting corrosion compared to austenitic steels. This is because martensitic steels typically have higher levels of chromium and carbon, which can lead to the formation of chromium carbides along grain boundaries, making them more prone to localized corrosion attacks like pitting. Therefore, the statement suggesting that martensitic steels are less susceptible to pitting corrosion than austenitic steels is false.