ThePipingMart Blog Grades SAE-AISI 4130 Steel (UNS G41300) – Composition, Properties and Uses

SAE-AISI 4130 Steel (UNS G41300) – Composition, Properties and Uses

SAE / AISI 4130 Steel

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 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 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.


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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