4130 Steel

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AISI 4130 Alloy Steel ,UNS G41300, 1.7218

What material is AISI 4130?

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 4130 alloy steel.

AISI 4130 Steel Equivalent Standards

Country USA BS BS Japan
Standard ASTM A29 EN 10250/EN10083 BS 970 JIS G4105
Grades 4130 25CrMo4/1.7218 708A25/708M25 SCM430

ASTM 4130 Steels Chemical Composition

Standard Grade C Mn P S Si Cr Mo
ASTM A29 4130 0.28-0.33 0.40-0.60 0.035 0.040 0.15-0.35 0.80-1.10 0.15-0.25
0.22-0.29 0.60-0.90 0.025 0.035 ≦0.40 0.90-1.2 0.15-0.30
JIS G4105 SCM430/
0.28-0.33 0.60-0.85 0.030 0.030 0.15-0.35 0.90-1.2 0.15-0.30

SCM430 steel 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

Fabrication and Heat Treatment


1.7218 steel can be easily machined using conventional methods. However, machining becomes difficult when the hardness of the steel is increased.


Forming of 7218 steel can be performed in the annealed condition.


Welding of AISI 4130 steel can be performed by all commercial methods.

aisi 4130 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

We supply full range of Carbon Steel sheets, Carbon steel round bar , Carbon steel rod, Carbon steel plate, Alloy steel , hardened steel , Case Hardened Steel ,Special Steel ,Tool Steel ,Case harden Steel
Grades : ASTM a105, s45c , s50c, AISI4140, AISI4340, AISI4130, 5919, 6587