What base metal group includes stainless steels?

The correct choice identifies Group 2 as the base metal group that includes stainless steels. Stainless steels are characterized by their alloy composition, which typically includes a minimum of 10.5% chromium, providing enhanced corrosion resistance compared to other steel types. This characteristic allows stainless steels to perform well in various environments, especially those exposed to moisture or hazardous chemicals.

Group 2 metals are typically considered the most resistant to corrosion, which is a defining feature of stainless steels. They also include various alloyed metals that offer strength and durability, making them suitable for applications in the aviation industry, such as airframes and engine components. Understanding the properties and classifications of these metals is crucial for the safe and effective maintenance and operation of aircraft.

In contrast, other groups are associated with different types of base metals or their respective characteristics, emphasizing the unique nature of stainless steels within their classification. This clarity in categorization helps in identifying the right materials for specific applications in aerospace and naval contexts.