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SAE-AISI 4340M Steel vs. S41425 Stainless Steel

Both SAE-AISI 4340M steel and S41425 stainless steel are iron alloys. They have 82% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 4340M steel and the bottom bar is S41425 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 710
280
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 6.0
17
Fatigue Strength, MPa 690
450
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
77
Shear Strength, MPa 1360
570
Tensile Strength: Ultimate (UTS), MPa 2340
920
Tensile Strength: Yield (Proof), MPa 1240
750

Thermal Properties

Latent Heat of Fusion, J/g 280
280
Maximum Temperature: Mechanical, °C 430
810
Melting Completion (Liquidus), °C 1440
1450
Melting Onset (Solidus), °C 1400
1410
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 38
16
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
13
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.9
2.9
Embodied Energy, MJ/kg 26
40
Embodied Water, L/kg 55
120

Common Calculations

PREN (Pitting Resistance) 2.2
21
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
150
Resilience: Unit (Modulus of Resilience), kJ/m3 4120
1420
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 84
33
Strength to Weight: Bending, points 51
27
Thermal Diffusivity, mm2/s 10
4.4
Thermal Shock Resistance, points 70
33

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.050
Chromium (Cr), % 0.7 to 1.0
12 to 15
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 93.3 to 94.8
74 to 81.9
Manganese (Mn), % 0.65 to 0.9
0.5 to 1.0
Molybdenum (Mo), % 0.35 to 0.45
1.5 to 2.0
Nickel (Ni), % 1.7 to 2.0
4.0 to 7.0
Nitrogen (N), % 0
0.060 to 0.12
Phosphorus (P), % 0 to 0.012
0 to 0.020
Silicon (Si), % 1.5 to 1.8
0 to 0.5
Sulfur (S), % 0 to 0.012
0 to 0.0050
Vanadium (V), % 0.050 to 0.1
0