4320, a low-alloy steel, is distinguished by its superior strength and toughness, achieved by adding nickel, chromium, and molybdenum. This grade is known for its exceptional harden ability and resistance to wear and abrasion, even in severe conditions.
Typically, 4320 steel is used in applications demanding both strength and toughness, such as gears, pinions, and shafts in heavy-duty machinery. It’s commonly chosen for components in the automotive and aerospace industries, where durability under high stress is crucial.
| Chemical Properties | |
|---|---|
| Iron | 95.85 – 96.98 |
| Carbon | 0.17 – 0.22 |
| Manganese | 0.45 – 0.65 |
| Chromium | 0.40 – 0.60 |
| Nickel | 1.65 – 2.00 |
| Molybdenum | 0.20 – 0.30 |
| Silicon | 0.15 – 0.30 |
| Phosphorus | 0.035 (max) |
| Sulfur | 0.040 (max) |
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