- Excellent toughness and impact resistance
- High fatigue strength for heavy-duty use
- Good wear resistance under repeated load conditions
- Excellent hardenability through heat treatment
- Reliable machinability for industrial processing
- Suitable for structural and mechanical applications
38CrMoAlA EN41B Steel 8550 Round Bar A33383
8550 round bar is a high-strength nickel-chromium-molybdenum alloy steel widely used in demanding industrial applications requiring excellent toughness, fatigue resistance, and wear performance. SAE 8550 round bar is designed for components subjected to heavy loads, repeated stress, and impact conditions.
This 8550 alloy steel round bar provides outstanding hardenability and mechanical stability, making it suitable for automotive parts, transmission components, industrial machinery, and heavy-duty engineering systems. As a versatile alloy steel round bar, 8550 steel bar delivers reliable performance in high-stress environments.
Compared with standard carbon steel, 8550 round bar offers improved durability, better fatigue strength, and enhanced heat-treatment response. These characteristics make 8550 steel round bar a preferred material for precision machining and structural engineering.
Key Features
- Excellent toughness and impact resistance
- High fatigue strength for heavy-duty use
- Good wear resistance under repeated load conditions
- Excellent hardenability through heat treatment
- Reliable machinability for industrial processing
- Suitable for structural and mechanical applications
Chemical Composition (Typical)
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.48 – 0.53 |
| Nickel (Ni) | 0.40 – 0.70 |
| Chromium (Cr) | 0.40 – 0.60 |
| Molybdenum (Mo) | 0.15 – 0.25 |
| Manganese (Mn) | 0.70 – 0.90 |
| Silicon (Si) | 0.15 – 0.35 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.040 |
| Iron (Fe) | Balance |
Mechanical Properties
| Property | Typical Value |
| Tensile Strength | 700–950 MPa |
| Yield Strength | ≥ 500 MPa |
| Elongation | ≥ 15% |
| Hardness | 180–260 HB |
| Density | 7.85 g/cm³ |
| Heat Treatment | Annealed, Quenched & Tempered |
Available Sizes & Specifications
8550 round bar is available in a wide range of diameters and custom-cut lengths to meet industrial manufacturing requirements.
- Diameter Range: 10 mm – 500 mm
- Length: Random Length, Fixed Length, Cut-to-Size
- Surface Finish: Black, Peeled, Bright, Ground
- Processing Options: Forged, Turned, Heat Treated
- Certification: Mill Test Certificate Available
Custom dimensions and machining services are available for specific project requirements.
Applications of 8550 Round Bar
8550 round bar is widely used in industries requiring high-strength alloy steel with excellent durability and wear resistance.
Automotive Industry
- Transmission shafts
- Axles and drive components
- Gears and crankshafts
- Heavy-duty suspension parts
Industrial Machinery
- Machine shafts
- Forged components
- Mechanical couplings
- Heavy equipment parts
Oil & Gas Industry
- Structural supports
- Rotating equipment components
- High-load mechanical parts
Manufacturing & Engineering
- Precision-machined parts
- Structural steel components
- Wear-resistant industrial parts
- Mechanical power transmission systems
Benefits of 8550 Alloy Steel Round Bar
Compared with standard alloy steels, 8550 alloy steel round bar provides:
- Improved strength and toughness
- Better hardenability for heat-treated applications
- Enhanced wear resistance
- Excellent fatigue performance
- Reliable long-term durability
- Reduced maintenance and replacement costs
Why Choose Our 8550 Round Bar?
- Strict quality control procedures
- Stable dimensional tolerance
- Competitive factory pricing
- Custom machining and cutting services
- Fast delivery for international orders
- Technical support for alloy steel selection
Packaging & Delivery
- Export-standard seaworthy packaging
- Rust-preventive protective wrapping
- Wooden crates or bundled packing options
- Safe transportation for global shipping
Request a Quote
Looking for a trusted 8550 round bar supplier or manufacturer? Contact us today for pricing, technical specifications, and custom solutions.
Request a fast quote now for premium SAE 8550 alloy steel round bar.
Email: sales@hengyimetal.com
WhatsApp: +86 19521258704
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