API 571 Certification (Corrosion & Materials) Practice Test

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In the context of corrosion resistance, which offering is relatively superior?

  1. Low alloy steels

  2. 316L SS

  3. Carbon steels

  4. Alloy B-2

The correct answer is: Alloy B-2

In the realm of corrosion resistance, Alloy B-2 is known for its exceptional performance in harsh environments, particularly for its resistance to pitting, crevice corrosion, and stress corrosion cracking. This alloy is composed primarily of nickel, with additional molybdenum and chromium, which impart significant resistance to a wide range of corrosive media, including hydrochloric acid at various concentrations and temperatures. As a result, it is often preferred in applications where exposure to highly corrosive substances is expected. While 316L stainless steel is also recognized for its corrosion resistance, particularly in chloride environments, its performance can be outmatched by Alloy B-2 under certain conditions, especially in reducing environments. Low alloy steels and carbon steels, on the other hand, typically lack the same level of corrosion resistance as both 316L stainless steel and Alloy B-2, making them less suitable for corrosive applications.

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