ASTM A513 4130
ASTM A513 Grade 4130 is a high-strength, low-alloy (HSLA) chromium-molybdenum steel used extensively for mechanical tubing applications requiring excellent toughness, weldability, and uniformity. Known for its superior strength-to-weight ratio, ASTM A513 4130 tubing is manufactured by electric-resistance welding (ERW) and cold-worked to achieve enhanced dimensional accuracy and mechanical performance.
It is widely used in automotive components, hydraulic systems, aircraft parts, performance racing products, agricultural machinery, and other high-stress engineering applications.
Key Features
- High Strength & Toughness due to Chromium-Molybdenum (Cr-Mo) alloying
- Excellent Machinability & Weldability
- Superior Fatigue Resistance for dynamic load conditions
- Good Hardenability with capacity for heat treatment
- Tight Dimensional Tolerances due to cold-working
- Lightweight yet Durable, suitable for weight-sensitive applications
- High Impact Resistance even at elevated temperatures
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | G41300 |
| SAE | 4130 |
| AISI | 4130 |
| EN | 25CrMo4 |
| DIN | 1.7218 |
| JIS | SCM430 |
Available Sizes
-
Outer Diameter (OD): 6 mm to 350 mm
-
Wall Thickness: 0.5 mm to 25 mm
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Length: 3 meters, 6 meters, Custom cut lengths
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Shapes: Round / Square / Rectangular / Custom profiles
ASTM A513 4130 Chemical Composition (% Max)
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.28 – 0.33 |
| Manganese (Mn) | 0.40 – 0.60 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.040 |
| Silicon (Si) | 0.15 – 0.35 |
| Chromium (Cr) | 0.80 – 1.10 |
| Molybdenum (Mo) | 0.15 – 0.25 |
| Iron (Fe) | Balance |
ASTM A513 4130 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 560 – 670 MPa |
| Yield Strength | 460 – 530 MPa |
| Elongation | 20% (min) |
| Hardness | 143 – 207 HB |
| Modulus of Elasticity | 205 GPa |
ASTM A513 4130 Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting Point | 1425–1540°C |
| Thermal Conductivity | 42.6 W/m-K |
| Electrical Resistivity | 0.65 µΩ-m |
| Poisson’s Ratio | 0.29 |
Types of ASTM A513 4130 Tubing
- ERW Mechanical Tubing
- DOM (Drawn Over Mandrel) Tubing
- Cold-Drawn Seamless Equivalent
- Round Chromoly Tubes
- Square & Rectangular Tubes
- Heat-Treated Tubes (Normalized/Quenched & Tempered)
Applications
- Automotive roll cages, steering components, suspension parts
- Aerospace structural tubing
- Hydraulic cylinders and precision mechanical parts
- Bicycle frames, racing chassis, motor sports components
- Agricultural & heavy machinery parts
- Industrial equipment requiring high strength-to-weight ratio
- Oil & gas tools, mining equipment
- Metal fabrication & engineering products
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