440A, 440B, 440C

Vipengele vya kawaida katika vyuma vyote 440:

• 16-18% ya chromium
• 1% Manganese
• 1% silicon
• 0.75% Molybdenum
• 0.04% Fosforasi
• 0.03% salfa
• Asilimia fulani ya Carbon

440A chuma

• 0.6-0.75% Carbon

440B chuma

• Kaboni 0.75-0.95%.

440C chuma

• 0.95-1.20% Carbon