AISI 4130 steel is a type of alloy steel that contains chromium and molybdenum. It is known for its high strength, toughness, and excellent weldability. This steel is commonly used in applications such as aircraft parts, structural tubing, and racing car components. It offers good resistance to fatigue and impact, making it suitable for demanding environments.
4130 Steel Bar Chemical Composition
0.80 – 1.10
0.40 – 0.60
0.280 – 0.330
0.15 – 0.30
0.15 – 0.25
Tensile strength, ultimate
Tensile strength, yield
Modulus of elasticity
Bulk modulus (Typical for steel)
Shear modulus (Typical for steel)
Elongation at break (in 50 mm)
Reduction of area
Hardness, Knoop (Converted from Brinell hardness)
Hardness, Rockwell B (Converted from Brinell hardness)
Hardness, Rockwell C (Converted from Brinell hardness, value below normal HRC range, for comparison purposes only.)
Hardness, Vickers (Converted from Brinell hardness)
Machinability (Annealed and cold drawn. Based on 100% machinability for AISI 1212 steel.)
Other designations that are equivalent to AISI 4130 alloy steel include the following;
UNI 25 CrMo 4
JIS SCCrM 1
JIS SCM 2
B.S. CDS 110
AFNOR 25 CD 4 (S)
Type 4130 steel is an exceptionally tough metal vital to manufacturing, welding, cutting, and other high-stress applications in industry. Its great heat treatment characteristics impart a high toughness and, combined with its great workability and machinability, allows 4130 steel to be widely useful. Though most often implemented as structural steel, there are some other notable applications, such as:
- Manufacturing equipment for bearings, vehicle parts, and gears
- Rock crushing machinery
- Resistance welding products
- Drill bitsand taps
- Mills and cutters
Fabrication and Heat Treatment
Machinability – AISI 4130 steel can be easily machined using conventional methods. However, machining becomes difficult when the hardness of the steel is increased.
Forming of AISI 4130 steel can be performed in the annealed condition.
- Welding of AISI 4130 steel can be performed by all commercial methods.
- Heat Treatment – AISI 4130 steel is heated at 871°C (1600°F) and then quenched in oil. This steel is usually heat-treated at temperatures ranging from 899 to 927°C (1650 to 1700°F).
- Forging of AISI 4130 steel can be performed at 954 to 1204°C (1750 to 2200°F).
- Hot working of AISI 4130 steel can be done at 816 to 1093°C (1500 to 2000°F).
- AISI 4130 steel can be cold worked using conventional methods.
- AISI 4130 steel can be annealed at 843°C (1550°F) followed by air cooling at 482°C (900°F).
- Tempering of AISI 4130 steel can be performed at 399 to 566°C (750 to 1050°F), depending on the desired strength level.
- Hardening of AISI 4130 steel can be done with cold working or heat treatment.
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