AISI 4130 Round Bar (UNS G41300)
AISI 4130 Round Bar is a chromium-molybdenum alloy steel known for its excellent strength-to-weight ratio, good toughness, and outstanding response to heat treatment. Commonly referred to as Chromoly steel, 4130 round bars are widely used in aerospace, automotive, oil & gas, and structural applications where high strength, fatigue resistance, and weldability are required.
Key Features
- Chromium–molybdenum alloy steel with high strength
- Excellent toughness and fatigue resistance
- Good weldability compared to higher alloy steels
- Outstanding response to quenching and tempering
- Maintains strength at elevated temperatures
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| EN | 25CrMo4 |
| DIN | 1.7218 |
| JIS | SCM420 |
| BS | 708M40 |
Sizes
- Diameter: 6 mm to 500 mm
- Length: 3 m, 6 m, or cut-to-length
- Custom sizes available on request
AISI 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 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.040 |
| Iron (Fe) | Balance |
4130 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 560 – 670 MPa |
| Yield Strength | ~460 MPa |
| Elongation | 20 – 25% |
| Hardness (Annealed) | ~197 HB |
UNS G41300 Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting Point | ~1430°C |
| Thermal Conductivity | 42.6 W/m·K |
| Modulus of Elasticity | 205 GPa |
Types of AISI 4130 Round Bar
- Hot Rolled Round Bar
- Cold Drawn Round Bar
- Bright Round Bar
- Turned & Polished Round Bar
- Quenched & Tempered Round Bar
Applications
- Aerospace structural components
- Automotive axles and shafts
- Oil & gas drilling tools
- Pressure vessels and piping components
- Bicycle frames and roll cages
- Heavy engineering and fabrication
Reviews
There are no reviews yet.