Question

Ball bearings are generally made of-
1. Cast iron
2. Malleable cast iron
3. Carbon steel
4. Chrome steel

Answer 1

Correct Answer - Option 4 : Chrome steel

Explanation:

• The most common chrome steels contain from 0.5 to 2% chromium and 0.1 to 1.5% carbon.
• The chrome steel is used for balls, rollers and races for bearings.
• A Nickel-Chrome steel containing 3.25% nickel, 1.5% chromium and 0.25% carbon is much used for armour plates.
• Chrome nickel steel is extensively used for motor car crankshafts, axles and gears requiring great strength and hardness.