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AISI 6150 Alloy Steel | UNS G61500 | 1.8159 Spring Steel Guide
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When your project calls for strength, toughness, and precision, AISI 6150 steel stands ready to deliver. At SteelPro Group, we provide 6150 steel in various forms and sizes, offering custom solutions tailored to your project needs. Read on to learn more about this versatile steel.
What Is 6150 Steel?
AISI 6150 steel is a chromium-vanadium alloy with high carbon content. It is similar to AISI 5150 but contains a small amount of vanadium, which increases its hardness. This alloy is commonly used for components that must withstand high stress, vibration, and impact.
It is easy to machine in its annealed state and can be heat-treated without significant deformation. When oil is quenched and tempered, it achieves excellent hardness and toughness. It is commonly used for springs, shafts, gears, and other critical parts that endure high friction and stress.
6150 Alloy Steel Key Characteristics
- Chromium-Vanadium Alloy
- High Strength and Hardness
- Impact Resistance
- Heat Treatment Capability
- Good Wear Resistance
- Low Deformation
6150 Steel Applications
| Industry | Applications |
| Automotive Industry | Axles and shafts, Transmission gears and components |
| Tool Manufacturing | Tooling and die components, Drill bits, reamers, and other cutting tools |
| Aerospace Industry | Landing gear components, Engine components |
| Heavy Machinery | Crankshafts and connecting rods, Bearings and gears |
| Spring Manufacturing | Leaf springs and coil springs |
| Industrial Equipment | Pressure vessels and pumps |
AISI 6150 Steel Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| GB/T 3077 | 50CrVA |
| ISC | A23503 |
| ASTM A29 | 6150 |
| UNS | G61500 |
| EN 10083/DIN | 1.8159/51CrV4 (50CrV4) |
| JIS G4801 | SUP10 |
6150 Steel Chemical Composition
| Elements | Content |
| Carbon (C) | 0.48~0.53% |
| Silicon (Si) | 0.15~0.35% |
| Manganese (Mn) | 0.7~0.9% |
| Phosphorus (P) | ≤0.035% |
| Sulfur (S) | ≤0.04% |
| Chromium (Cr) | 0.8~1.1% |
| Nickel (Ni) | ≤0.25% |
| Copper (Cu) | ≤0.35% |
| Molybdenum (Mo) | ≤0.06% |
| Vanadium (V) | ≥0.15% |
6150 Steel Mechanical Properties
| Property | Metric | Imperial |
| Hardness (Rockwell C) | 197 HB | 197 HB |
| Yield Strength | 412.3 MPa | 59.8 ksi |
| Tensile Strength | 667.4 MPa | 96.7 ksi |
| Elongation (50 mm gauge length) | ≥23.0% | ≥23.0% |
| Impact Strength (J) | 27.4 J | 20.2 ft-lb |
| Modulus of Elasticity | 190~210 GPa | 27.5~30.5 x 10⁶ psi |
| Bulk Modulus | 160 GPa | 23200 ksi |
| Shear Modulus | 80.0 GPa | 11600 ksi |
| Poisson’s Ratio | 0.27~0.30 | 0.27~0.30 |
| Machinability | 55% | 55% |
| Reduction in Area | 48.40% | 48.40% |
6150 Steel Physical Properties
| Property | Metric | Imperial |
| Density | 7.85 g/cm³ | 0.284 lb/in³ |
| Melting Point | 1425-1500 °C | 2597-2732 °F |
| Electrical Resistivity | 0.0000234 ohm-cm | 0.0000234 ohm-cm |
6150 Steel Product Forms and Size
SteelPro Group offers 6150 steel in various forms such as round bars, flat bars, plates, and coils. We deliver products in conditions like annealed, quenched, and tempered states. Whether you need standard or customized dimensions, we are committed to delivering high-quality 6150 steel products that meet your exact specifications.
| Product Form | Size Range (Metric / Imperial) |
| Round Bar | Diameter: 20~500 mm (0.79~19.69 inches) |
| Flat Bar | Width: 20~500 mm (0.79~19.69 inches) |
| Thickness: 3~150 mm (0.12~5.91 inches) | |
| Square Bar | Diameter: 20~500 mm (0.79~19.69 inches) |
| Plate | Width: 200~2500 mm (7.87~98.43 inches) |
| Thickness: 3~150 mm (0.12~5.91 inches) | |
| Sheet | Width: 200~2500 mm (7.87~98.43 inches) |
| Thickness: 0.5~10 mm (0.02~0.39 inches) | |
| Coil | Width: 200~2500 mm (7.87~98.43 inches) |
| Thickness: 0.5~10 mm (0.02~0.39 inches) |
6150 Steel Forging Process
This is conducted within a temperature range of 1175-870ºC (2150-1600ºF). After forging, the steel must be slowly cooled or placed in a furnace to stabilize its temperature. It’s important not to forge the steel below 840ºC (1544ºF) to maintain its structural integrity and ensure the best properties.
6150 Steel Heat Treatment
- Preheating: The material is preheated to 650-675ºC (1200-1250ºF), ensuring uniform temperature distribution.
- Annealing: The steel is then annealed at 595-740ºC (1100-1300ºF) for 2 hours, which helps to refine its microstructure and improve machinability.
- Normalizing: A key step is normalizing at 900ºC (1650ºF), followed by air cooling to stabilize the steel’s grain structure.
- Quenching and Tempering: The steel is quenched in oil and tempered at 205-650ºC (400-1200ºF) for 1 hour per inch (25mm) of thickness, ensuring it meets specific hardness and toughness requirements.
- SteelPro Group provides heat treatment services that are precisely tailored to enhance the mechanical properties of 6150 steel
6150 Steel Machining
AISI 6150 steel is known for its good machinability, especially when it has undergone proper heat treatment. With a machinability rating of 59, it allows for efficient processing when in a coarse pearlite or spheroidite state.
6150 Steel Welding
AISI 6150 should be welded only in the annealed condition, as welding hardened or tempered steel could degrade its mechanical properties. Preheating the steel before welding and post-weld stress relief is necessary to preserve the integrity of the material.
Related Reading: Can You Weld Alloy Steel?
6150 Steel Custom Solutions and Final Processing
Once processed, 6150 steel can be delivered in various forms, such as bars, plates, and custom components. SteelPro Group offers custom sizing and processing, including heat treatment like quenching and tempering, to meet specific project requirements.
Choosing us means partnering with a team providing steel tailored to your needs. Contact us today to see how our custom solutions can elevate your project.
