AISI 4130 Alloy Steel Bar (UNS G41300)
AISI 4130 alloy bar is valued for its versatility, strength, and adaptability to heat treatment, making it a preferred choice in high-stress, lightweight applications across industries.
AISI 4130 alloy bar is a low-alloy C-steel containing chromium and molybdenum as strengthening agents. It has low carbon content, and hence it can be welded easily. It is supplied as a round bar, commonly in the hardened and tempered condition with a hardness of max. 22 HRC.
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Chemical Composition
| Element | Content (%) |
| Fe | 97.03 – 98.22 |
| Cr | 0.80 – 1.10 |
| Mn | 0.40 – 0.60 |
| C | 0.280 – 0.330 |
| Si | 0.15 – 0.30 |
| Mo | 0.15 – 0.25 |
| S | 0.040 |
| P | 0.035 |
Physical Properties
|
Properties |
Metric |
Imperial |
|
Density |
7.85 g/cm3 |
0.284 lb/in³ |
|
Melting point |
1432°C |
2610°F |
Mechanical Properties
|
Properties |
Metric |
Imperial |
|
Tensile strength, ultimate |
560 MPa |
81200 psi |
|
Tensile strength, yield |
460 MPa |
66700 psi |
|
Modulus of elasticity |
190-210 GPa |
27557-30458 ksi |
|
Bulk modulus (Typical for steel) |
140 GPa |
20300 ksi |
|
Shear modulus (Typical for steel) |
80 GPa |
11600 ksi |
|
Poissons ratio |
0.27-0.30 |
0.27-0.30 |
|
Elongation at break (in 50 mm) |
21.50% |
21.50% |
|
Reduction of area |
59.6 |
59.60% |
|
Hardness, Brinell |
217 |
217 |
|
Hardness, Knoop (Converted from Brinell hardness) |
240 |
240 |
|
Hardness, Rockwell B (Converted from Brinell hardness) |
95 |
95 |
|
Hardness, Rockwell C (Converted from Brinell hardness, value below normal HRC range, for comparison purposes only.) |
17 |
17 |
|
Hardness, Vickers (Converted from Brinell hardness) |
228 |
228 |
|
Machinability (Annealed and cold drawn. Based on 100% machinability for AISI 1212 steel.) |
70 |
70 |
Thermal Properties
|
Properties |
Metric |
Imperial |
|
Thermal expansion coefficient (@20-100°C/68-212°F) |
13.3 µm/m°C |
7.39 µin/in°F |
|
Thermal conductivity |
70.2 W/mK |
487 BTU.in/hrft².°F |
-
Key Properties
High Strength-to-Weight Ratio: Ideal for weight-sensitive applications.
Toughness: Retains impact resistance even after heat treatment.
Hardenability: Can be heat-treated to achieve a range of mechanical properties.
Fatigue Resistance: Suitable for cyclic loading applications (e.g., aerospace components).
Machinability: Fair in normalized condition; improves with annealing.
Weldability: Requires preheating (300–400°F) and post-weld heat treatment to avoid cracking.
-
Key Properties
Annealing: Heated to 872°C (1600°F), slow-cooled for machinability.
Quenching & Tempering: Austenitized at 843–927°C (1550–1700°F), oil-quenched, then tempered (205–649°C / 400–1200°F) to balance strength and toughness.
-
Applications
Aerospace: Landing gear, engine mounts, structural components.
Automotive: Axles, roll cages, suspension parts.
Industrial: Drill collars, tooling, hydraulic shafts.
Consumer Goods: Bicycle frames, firearms, racing components.
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