8650 Round Bar: Material Profile
8650 combines good hardenability with strength, toughness, and fatigue resistance.
It is used for components under heavy loads and repeated stress in automotive, agricultural, and industrial equipment.
Purchase to the controlling ASTM, SAE, AMS, or customer specification. Section size, supply condition, mechanical properties, surface limits, testing, and heat/lot traceability can change the acceptable material and processing route.
Key Characteristics
- Good hardenability
- High strength
- Good toughness
- Wear and fatigue resistance
Common Applications
- Spindles and shafts
- Axles and gears
- Heavy-equipment parts
- Automotive and agricultural components
Typical Chemical Range
| Element | Weight % |
|---|---|
| Carbon | 0.48–0.53 |
| Manganese | 0.75–1.00 |
| Silicon | 0.15–0.35 |
| Nickel | 0.40–0.70 |
| Chromium | 0.40–0.60 |
| Molybdenum | 0.15–0.25 |
| Phosphorus (max) | 0.035 |
| Sulfur (max) | 0.040 |
Chemistry ranges are general reference values. The purchase specification and material certification govern the order.
