SAE-AISI 4130 Steel (UNS G41300) – Composition, Properties and Uses
Do you need a steel alloy that offers exceptional strength and durability? If so, then SAE / AISI 4130 is the material for you. This versatile steel alloy has been used in a wide variety of applications, from aerospace components to automotive parts. In this guide, we’ll discuss the uses and properties of UNS G41300 in detail.
AISI 4130 Composition
| Element | Content (%) |
|---|---|
| Iron, Fe | 97.03 – 98.22 |
| Chromium, Cr | 0.80 – 1.10 |
| Manganese, Mn | 0.40 – 0.60 |
| Carbon, C | 0.280 – 0.330 |
| Silicon, Si | 0.15 – 0.30 |
| Molybdenum, Mo | 0.15 – 0.25 |
| Sulfur, S | 0.040 |
| Phosphorous, P | 0.035 |
AISI 4130 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 |
AISI 4130 Physical Properties
| Properties | Metric | Imperial |
|---|---|---|
| Density | 7.85 g/cm3 | 0.284 lb/in³ |
| Melting point | 1432°C | 2610°F |
AISI 4130 Thermal Properties
| Properties | Metric | Imperial |
|---|---|---|
| Thermal conductivity (100°C) | 42.7 W/mK | 296 BTU in/hr.ft2. °F |
AISI 4130 Equivalent
| AMS 6348 | AMS 6371 | ASTM A331 | ASTM A829 | DIN 1.7218 |
| AMS 6350 | AMS 6373 | ASTM A506 | MIL S-18729 | UNI 25 CrMo 4 |
| AMS 6351 | AMS 6374 | ASTM A507 | MIL S-6758 | JIS SCCrM 1 |
| AMS 6360 | AMS 6528 | ASTM A513 | SAE J1397 | JIS SCM 2 |
| AMS 6361 | AMS 7496 | ASTM A519 | SAE J404 | SS 2225 |
| AMS 6362 | ASTM A29 | ASTM A646 | SAE J412 | B.S. CDS 110 |
| AMS 6370 | ASTM A322 | ASTM A752 | AFNOR 25 CD 4 (S) | SAE J770 |
AISI 4130 Uses
SAE / AISI 4130 is a low-alloy steel that can be easily machined and welded. It is also known for its high strength-to-weight ratio and excellent corrosion resistance. Due to these features, it has been used in a variety of industries, such as aircraft construction and automotive manufacturing. It has also been used to construct structural frames and fasteners for ships, bridges, and buildings.
Corrosion Resistance
When exposed to atmospheric conditions, SAE / AISI 4130 exhibits excellent corrosion resistance due to its chromium content. It is resistant to both rusting and pitting corrosion in most atmospheres; however, it can be susceptible to stress corrosion cracking if exposed to certain chemicals or environments with high temperatures. As such, it should not be used in acidic or saltwater environments without additional protection or coatings.
Heat Resistance
SAE / AISI 4130 has a relatively low thermal expansion rate compared to other steels, which makes it an ideal choice for parts that need to remain dimensionally stable at elevated temperatures. Its creep strength (the ability of the steel to resist deformation under prolonged exposure to heat) is also quite good for alloy steel; however, it should not be used above 450 °C (842 °F).
Heat Treatment
Heat treating can help increase the strength and hardness of this steel by altering its microstructure; however, doing so requires careful control over time and temperature since improper heat treatment could reduce its mechanical properties instead. Annealing at 870 – 920°C (1600 – 1680°F) followed by oil quenching can increase its strength while maintaining ductility; however, tempering at 450 – 550°C (840 – 1020°F) may be required if further work hardening is desired after machining or welding operations are complete.
Machining
Machining SAe/Aisi4130 on conventional machine tools is straightforward because this steel is relatively easy to cut despite its high strength levels; however, machinists should take extra care when working with this material since any sharp edges may quickly dull cutting tools if they are not kept sharp enough during operations such as drilling or milling.
Welding
Welding this material requires caution as well due to its higher carbon content; preheating before welding may be necessary in order to avoid cracking due to rapid cooling during the welding process.
Conclusion
Sae/Aisi4130 is an incredibly versatile alloy that can provide exceptional durability and strength when properly treated. This low-alloy steel offers excellent corrosion resistance, heat resistance, machinability, weldability, and overall versatility. It’s no wonder why this material remains so popular across so many different industries! With proper care during fabrication processes like machining and welding, sae/aisi4130 can help create high-quality components that will last for years without fail.
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