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SAE-AISI 4140 Steel vs. K94200 Alloy

Both SAE-AISI 4140 steel and K94200 alloy are iron alloys. There are 22 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 4140 steel and the bottom bar is K94200 alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
140
Elongation at Break, % 11 to 26
5.0 to 32
Poisson's Ratio 0.29
0.34
Shear Modulus, GPa 73
54
Shear Strength, MPa 410 to 660
330 to 410
Tensile Strength: Ultimate (UTS), MPa 690 to 1080
500 to 710
Tensile Strength: Yield (Proof), MPa 590 to 990
270 to 650

Thermal Properties

Melting Onset (Solidus), °C 1420
1440
Specific Heat Capacity, J/kg-K 470
500
Thermal Conductivity, W/m-K 43
15
Thermal Expansion, µm/m-K 13
5.0

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
2.7
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
3.0

Otherwise Unclassified Properties

Density, g/cm3 7.8
8.2

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 74 to 180
35 to 130
Resilience: Unit (Modulus of Resilience), kJ/m3 920 to 2590
250 to 1460
Stiffness to Weight: Axial, points 13
9.8
Stiffness to Weight: Bending, points 24
21
Strength to Weight: Axial, points 25 to 38
17 to 24
Strength to Weight: Bending, points 22 to 30
17 to 22
Thermal Diffusivity, mm2/s 12
3.7
Thermal Shock Resistance, points 20 to 32
49 to 70

Comparable Variants