ASTM A519 4130 Seamless Mechanical Tubing
ASTM A519 Grade 4130 (UNS G41300) seamless mechanical tubing is a chromium-molybdenum (chromoly) alloy steel known for its superior strength, toughness, and fatigue resistance. This alloy is widely used in high-stress applications, including motorsport chassis, aircraft structural parts, mechanical components, oil & gas tools, and industrial machinery. Manufactured using hot-finished or cold-drawn processes, 4130 tubing provides excellent dimensional accuracy, weldability, and resistance to impact. Its balanced composition of chromium and molybdenum enhances hardenability, allowing it to perform exceptionally well under heat treatment and high-load conditions.
Key Features
- High tensile and yield strength
- Excellent weldability and formability
- Superior fatigue and impact resistance
- Good hardenability with uniform mechanical properties
- Suitable for heat treatment such as Q&T, annealing, and normalizing
- High-precision dimensional stability
- Ideal for aerospace, automotive, and oilfield applications
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| SAE | 4130 |
| UNS | G41300 |
| AISI | 4130 |
| DIN | 25CrMo4 |
| EN | 1.7218 |
| JIS | SCM430 |
ASTM A519 4130 Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.28 – 0.33 |
| Manganese (Mn) | 0.40 – 0.60 |
| Chromium (Cr) | 0.80 – 1.10 |
| Molybdenum (Mo) | 0.15 – 0.25 |
| Silicon (Si) | 0.15 – 0.35 |
| Sulfur (S) | ≤ 0.040 |
| Phosphorus (P) | ≤ 0.035 |
| Iron (Fe) | Balance |
ASTM A519 4130 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 560 – 670 MPa |
| Yield Strength | 460 – 510 MPa |
| Elongation | 18 – 25% |
| Hardness | 150 – 200 HB (Annealed) |
Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Modulus of Elasticity | 205 GPa |
| Thermal Conductivity | 42.7 W/m-K |
| Melting Point | ~1430°C |
Type of ASTM A519 4130 Tube
- Seamless Mechanical Tubing
- Cold Drawn Seamless Tubing
- Hot Finished Seamless Tubing
- Annealed Tubing
- Normalized Tubing
- Quenched & Tempered Tubing
- Precision Cut-to-Length Tubes
Applications
- Motorsports chassis & roll cages
- Aircraft structural components
- Oil & gas drilling tools
- Automotive suspension and steering parts
- Industrial machinery components
- Hydraulic cylinders and pressure vessels
- Bicycle frames and performance structures
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