The -B3 composition suffix means which composition?

The -B3 composition suffix means which composition?

• A. 2 1/4% Cr, 1% Mo
• B. 3% Cr, 2% Mo
• C. 1% Cr, 0.5% Mo
• D. 4% Cr, 1% Mo

Answer: (A)

The -B3 suffix encodes a specific balance of chromium and molybdenum in the alloy. For this suffix, the standard composition is about 2.25% chromium and 1% molybdenum, with those two elements driving corrosion resistance and high-temperature performance. The option that lists 2 1/4% Cr and 1% Mo matches this exact specification, so it is the correct fit. The other choices show Cr and Mo values that fall outside the B3 range, which is why they aren’t correct for this suffix.

The -B3 suffix encodes a specific balance of chromium and molybdenum in the alloy. For this suffix, the standard composition is about 2.25% chromium and 1% molybdenum, with those two elements driving corrosion resistance and high-temperature performance. The option that lists 2 1/4% Cr and 1% Mo matches this exact specification, so it is the correct fit. The other choices show Cr and Mo values that fall outside the B3 range, which is why they aren’t correct for this suffix.