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AISI 4130 Alloy Steel (UNS G41300)
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Thursday, 15 Nov 2012
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Alloy steels are designated by AISI four digit numbers. They are more responsive to mechanical and heat treatments than carbon steels. They comprise different types of steels with compositions which exceed the limitations of B, C, Mn, Mo, Ni, Si, Cr and Va in the carbon steels.

AISI 4130 alloy steel contains chromium and molybdenum as strengthening agents. It has low carbon content, and hence it can be welded easily. The datasheet given below provides more details about AISI 4130 alloy steel.

Chemical Composition
The chemical composition of AISI 4130 alloy steel is listed in the following table.

ElementContent (%)
Iron, Fe97.03� 98.22
Chromium, Cr0.80� 1.10
Manganese, Mn0.40� 0.60
Carbon, C0.280� 0.330
Silicon, Si0.15� 0.30
Molybdenum, Mo0.15� 0.25
Sulfur, S0.04
Phosphorous, P0.035

Physical Properties
The following table shows the physical properties of AISI 4130 alloy steel.

Density7.85 g/cm30.284 lb/in3
Melting point1432�C2610�F

Mechanical Properties
The mechanical properties of AISI 4130 alloy steel are outlined in the following table.

Tensile strength, ultimate560 MPa81200 psi
Tensile strength, yield460 MPa66700 psi
Modulus of elasticity190-210 GPa27557-30458 ksi
Bulk modulus (Typical for steel)140 GPa20300 ksi
Shear modulus (Typical for steel)80 GPa11600 ksi
Poissons ratio0.27-0.300.27-0.30
Elongation at break (in 50 mm)21.50%21.50%
Reduction of area59.659.60%
Hardness, Brinell217217
Hardness, Knoop (Converted from Brinell hardness)240240
Hardness, Rockwell B (Converted from Brinell hardness)9595
Hardness, Rockwell C1717
Hardness, Vickers (Converted from Brinell hardness)228228

Thermal Properties
The thermal properties of AISI 4130 alloy steel are outlined in the following table.

Thermal conductivity (100�C)42.7 W/mK296 BTU in/hr.ft2. �F

Other Designations
Other designations that are equivalent to AISI 4130 alloy steel include the following.

AMS 6348AMS 6371ASTM A331ASTM A829DIN 1.7218
AMS 6350AMS 6373ASTM A506MIL S-18729UNI 25 CrMo 4
AMS 6351AMS 6374ASTM A507MIL S-6758JIS SCCrM 1
AMS 6360AMS 6528ASTM A513SAE J1397JIS SCM 2
AMS 6361AMS 7496ASTM A519SAE J404SS 2225
AMS 6362ASTM A29ASTM A646SAE J412B.S. CDS 110
AMS 6370ASTM A322ASTM A752AFNOR 25 CD 4 (S)SAE J770

Fabrication and Heat Treatment
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 can be performed at 954 to 1204°C (1750 to 2200°F).

Hot Working
Hot working of AISI 4130 steel can be done at 816 to 1093°C (1500 to 2000°F).

Cold Working
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.

The following are some of the major applications of AISI 4130 alloy steel:

Aircraft engine mounts
Welded tubing

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