ASTM A519 4130 Seamless Alloy Steel Tube
ASTM A519 4130 Seamless Alloy Steel Tube: Properties, Equivalents & Applications
Detailed analysis of ASTM A519 Grade 4130 seamless alloy steel tube, including chemical composition, mechanical and physical properties, international equivalents, similar grades, and applications in automotive, structural, and aerospace engineering.
Hot finishing, cold drawing, annealing, normalizing, quenching & tempering, stress relieving
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ASTM A519 4130 Seamless Alloy Steel Tube Introduction
ASTM A519 Grade 4130 is a chromium-molybdenum low-alloy steel seamless tube intended for mechanical and structural applications. It offers high strength, good toughness, and excellent weldability. The alloy is typically supplied in the normalized, annealed, or cold-drawn & stress-relieved condition, and can be further heat treated to achieve a wide range of mechanical properties. Its balanced composition of carbon, chromium, and molybdenum provides improved hardenability over plain carbon steels, making it suitable for parts subjected to moderate stresses and requiring reliable performance. Typical uses include
- automotive roll cages and chassis components
- aircraft structural tubes
- oil & gas downhole tools
- motorcycle frames
- general engineering parts
ASTM A519 4130 Seamless Alloy Steel Tube Chemical Composition per ASTM A519
The chemical composition of ASTM A519 Grade 4130 is tightly controlled to ensure consistent mechanical properties and hardenability. Chromium and molybdenum are the key alloying elements that improve strength and toughness. Residual elements such as phosphorus and sulfur are limited to preserve ductility and weldability. The table below lists the standard range for each element.
| Chemical Element | Content (wt.%) | Remarks |
|---|---|---|
| Carbon (C) | 0.28 - 0.33 | |
| Manganese (Mn) | 0.40 - 0.60 | |
| Phosphorus (P) | ≤ 0.040 | |
| 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 A519 4130 Seamless Alloy Steel Tube Thermal & Electrical Properties
The physical properties listed are representative of 4130 alloy steel at room temperature unless otherwise noted. Actual values may vary slightly depending on heat treatment and manufacturing process.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7850 | kg/m³ | 20°C (68°F) |
| Modulus of Elasticity (E) | 205 | GPa | 20°C (68°F) |
| Shear Modulus (G) | 80 | GPa | 20°C (68°F) |
| Poisson's Ratio (ν) | 0.29 | 20°C (68°F) | |
| Thermal Expansion (α) | 11.2 | µm/m·°C | 20-100°C (68-212°F) |
| Thermal Expansion (α) | 12.2 | µm/m·°C | 20-200°C (68-392°F) |
| Thermal Expansion (α) | 13.0 | µm/m·°C | 20-300°C (68-572°F) |
| Thermal Conductivity (λ) | 42.7 | W/m·K | At 100°C (212°F) |
| Specific Heat Capacity | 477 | J/kg·K | At 100°C (212°F) |
| Electrical Resistivity (ρ_e) | 0.22 | µΩ·m | 20°C (68°F) |
ASTM A519 4130 Seamless Alloy Steel Tube Mechanical Properties
ASTM A519 does not mandate specific mechanical properties; they are subject to agreement between purchaser and supplier. The values below are typical minimums for common delivery conditions of Grade 4130 seamless tube. Properties can be significantly enhanced by quenching and tempering. Hardness values are approximate.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Tensile Strength (Rm) | ≥ 517 | MPa | Normalized at 870°C (1600°F) |
| Yield Strength (ReH) | ≥ 379 | MPa | Normalized at 870°C (1600°F) |
| Elongation (A) | ≥ 20 | % | Normalized, gauge length 2 in. (50 mm) |
| Hardness | 170 - 229 | HBW | Normalized |
| Tensile Strength (Rm) | ≥ 483 | MPa | Annealed at 855°C (1575°F) |
| Yield Strength (ReH) | ≥ 310 | MPa | Annealed at 855°C (1575°F) |
| Elongation (A) | ≥ 30 | % | Annealed, gauge length 2 in. (50 mm) |
| Hardness | 143 - 200 | HBW | Annealed |
| Tensile Strength (Rm) | ≥ 586 | MPa | Cold drawn & stress relieved |
| Yield Strength (ReH) | ≥ 483 | MPa | Cold drawn & stress relieved |
| Elongation (A) | ≥ 10 | % | Cold drawn & stress relieved, gauge length 2 in. (50 mm) |
| Hardness | 179 - 235 | HBW | Cold drawn & stress relieved |
ASTM A519 4130 Seamless Alloy Steel Tube Complete Equivalent Standards and Substitute Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A519 | 4130 | Seamless mechanical tubing |
| Europe | EN 10297-1 | 25CrMo4 (1.7218) | Seamless circular steel tubes for mechanical and general engineering purposes |
| International | ISO 2938 | 25CrMo4 | Seamless steel tubes for mechanical purposes |
| Japan | JIS G3441 | SCM430TK | Alloy steel tubes for machine structural purposes |
ASTM A519 4130 Seamless Alloy Steel Tube Application Introduction
ASTM A519 4130 seamless tube is widely adopted where a high strength-to-weight ratio, good fatigue resistance, and reliable weldability are required. It can be machined in the normalized or annealed condition and subsequently heat treated to meet specific hardness and strength targets. Typical application industries and products include:
Product Applications: Roll cages and chassis tubing, Aircraft structural tubes (fuselage, landing gear), Drill collars and downhole tools, Motorcycle frames and swingarms, High-performance bicycle frames, Pressure vessels and heat exchangers
Processed into products: Tie rods and steering linkages, Suspension arms and control rods, Drive shafts and axle tubes, Torque tubes and pushrods, Structural crossmembers and supports, Hydraulic cylinder barrels
Application industries: Automotive & Motorsports, Aerospace & Defense, Oil & Gas, Bicycle Manufacturing, General Engineering, Power Generation
ASTM A519 4130 Seamless Alloy Steel Tube Closely Related or Similar Materials
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | AISI/SAE | 4130 | General wrought alloy steel (bar, plate, forging) |
| USA | ASTM A29 | 4130 | Steel bars, carbon and alloy, hot-wrought |
| USA | ASTM A322 | 4130 | Alloy steel bars for heat treatment |
| Europe | EN 10083-3 | 25CrMo4 (1.7218) | Steels for quenching and tempering |
| China | GB/T 3077 | 30CrMo | Alloy structural steel (slight difference in Mn content) |
| USA | AMS 6360 / 6370 | 4130 | Aerospace Material Specification (tube / bar) |
Notes:
The mechanical properties of ASTM A519 Grade 4130 are not mandatory and are typically specified at the time of order. Supplementary requirements such as hardness testing, non-destructive evaluation, and special packaging are available. For applications requiring enhanced corrosion resistance, protective coatings or plating are recommended. The tube can be welded using conventional methods, but preheating and post-weld heat treatment may be necessary to avoid cracking.
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