440A, 440B, 440C

Common elements across all 440 steels:

• 16-18% chromium
• 1% Manganese
• 1% silicon
• 0.75% Molybdenum
• 0.04% Phosphorus
• 0.03% sulfur
• Some percentage of Carbon

440A steel

• 0.6-0.75% Carbon

440B steel

• 0.75-0.95% Carbon

440C steel

• 0.95-1.20% Carbon