- Excellent strength-to-weight ratio
- Good weldability and machinability
- High toughness and impact resistance
- Suitable for heat treatment and hardening
- Excellent fatigue performance
- Reliable mechanical properties under stress
4130 round bar is a chromium-molybdenum low-alloy steel product known for its excellent strength, toughness, weldability, and machinability. Commonly referred to as chromoly steel, SAE 4130 round bar is widely used in industries requiring durable structural components and high mechanical performance.
This material provides a strong balance between lightweight properties and structural reliability, making it ideal for aerospace, automotive, oil & gas, and industrial manufacturing applications.
Key Features
- Excellent strength-to-weight ratio
- Good weldability and machinability
- High toughness and impact resistance
- Suitable for heat treatment and hardening
- Excellent fatigue performance
- Reliable mechanical properties under stress
Chemical Composition (Typical)
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.28 – 0.33 |
| Chromium (Cr) | 0.80 – 1.10 |
| Molybdenum (Mo) | 0.15 – 0.25 |
| Manganese (Mn) | 0.40 – 0.60 |
| Silicon (Si) | 0.15 – 0.35 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.040 |
| Iron (Fe) | Balance |
Mechanical Properties
| Property | Typical Value |
| Tensile Strength | 560–760 MPa |
| Yield Strength | ≥ 460 MPa |
| Elongation | ≥ 20% |
| Hardness | 150–220 HB |
| Density | 7.85 g/cm³ |
| Melting Range | 1425–1540°C |
Available Sizes
4130 round bars are available in multiple diameters and lengths to meet industrial requirements.
- Diameter Range: 6 mm – 500 mm
- Length: Standard or Cut-to-Length
- Surface Finish: Black, Peeled, Bright, Ground
- Heat Treatment: Annealed, Normalized, Quenched & Tempered
Custom dimensions are available based on project specifications.
Applications
4130 round bar is widely used in industries requiring high-strength steel with excellent fabrication performance.
Aerospace Industry
- Aircraft structural parts
- Landing gear components
- Engine mounts
- Aerospace fasteners
Automotive Industry
- Racing chassis
- Suspension components
- Roll cages
- Drive shafts
Oil & Gas Industry
- Drilling equipment
- High-pressure fittings
- Structural supports
Industrial Manufacturing
- Shafts and axles
- Machine components
- Tooling fixtures
- Mechanical parts
Benefits of 4130 Round Bar
Compared with standard carbon steel bars, 4130 round bar offers:
- Higher strength and durability
- Better fatigue resistance
- Improved hardenability
- Excellent fabrication flexibility
- Reduced weight for structural applications
Why Choose Our 4130 Round Bar?
- High-quality raw materials
- Strict dimensional tolerance control
- Full material certification available
- Custom cutting and machining services
- Stable global supply and competitive pricing
Packaging & Delivery
- Standard export packaging
- Rust-protective wrapping
- Bundled or wooden crate packaging
- Fast international shipping solutions
Request a Quote
Looking for reliable 4130 round bar suppliers? Contact us today for pricing, technical specifications, and customized solutions.
Request a quote now and receive expert support for your 4130 steel requirements.
Email: sales@hengyimetal.com
WhatsApp: +86 19521258704
View more Alloy Steel Products
High-Strength 9260 Alloy Steel Round Bar
34CrNiMo6 Alloy Steel round bar EN1.6582
38CrMoAlA EN41B Steel 8550 Round Bar A33383
