The -B8 suffix indicates which composition?

The -B8 suffix indicates which composition?

• A. 9% chrome, 1% molly
• B. 9% chrome, 2% molly
• C. 9% nickel, 1% molly
• D. 9% chrome, 1% vanadium

Answer: (A)

Suffixes on alloy designations encode the key alloying elements and their approximate amounts. The -B8 suffix is used for a chromium–molybdenum family where the composition is about 9% chromium with 1% molybdenum. That yields a 9Cr–1Mo type alloy, which is known for good high-temperature strength and oxidation resistance. So the suffix points to 9% chromium and 1% molybdenum as the intended composition. The other options spell out different element contents (such as nickel or vanadium or a higher molybdenum level), which are not indicated by this suffix.

Suffixes on alloy designations encode the key alloying elements and their approximate amounts. The -B8 suffix is used for a chromium–molybdenum family where the composition is about 9% chromium with 1% molybdenum. That yields a 9Cr–1Mo type alloy, which is known for good high-temperature strength and oxidation resistance. So the suffix points to 9% chromium and 1% molybdenum as the intended composition. The other options spell out different element contents (such as nickel or vanadium or a higher molybdenum level), which are not indicated by this suffix.