The -A1 composition suffix means which content?

The -A1 composition suffix means which content?

• A. 1/2% Mo
• B. 1% Cr
• C. 0.5% Ni
• D. 0.1% Mo

Answer: (A)

Suffix codes on alloy designations tell you approximately how much of a specific alloying element is present. The -A1 suffix is tied to a molybdenum content of about 0.5 percent. That level of Mo boosts hardenability and strength in low‑alloy steels often used in welded applications, which is why the -A1 designation points to roughly 1/2% Mo. The other elemental contents listed would correspond to different suffixes or alloy grades, not the -A1 designation.

Suffix codes on alloy designations tell you approximately how much of a specific alloying element is present. The -A1 suffix is tied to a molybdenum content of about 0.5 percent. That level of Mo boosts hardenability and strength in low‑alloy steels often used in welded applications, which is why the -A1 designation points to roughly 1/2% Mo. The other elemental contents listed would correspond to different suffixes or alloy grades, not the -A1 designation.