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SAE-AISI 4340M Steel vs. S35500 Stainless Steel

Both SAE-AISI 4340M steel and S35500 stainless steel are iron alloys. They have 80% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 4340M steel and the bottom bar is S35500 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 6.0
14
Fatigue Strength, MPa 690
690 to 730
Poisson's Ratio 0.29
0.28
Rockwell C Hardness 55
33 to 42
Shear Modulus, GPa 72
78
Shear Strength, MPa 1360
810 to 910
Tensile Strength: Ultimate (UTS), MPa 2340
1330 to 1490
Tensile Strength: Yield (Proof), MPa 1240
1200 to 1280

Thermal Properties

Latent Heat of Fusion, J/g 280
280
Maximum Temperature: Mechanical, °C 430
870
Melting Completion (Liquidus), °C 1440
1460
Melting Onset (Solidus), °C 1400
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 38
16
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
16
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.9
3.5
Embodied Energy, MJ/kg 26
47
Embodied Water, L/kg 55
130

Common Calculations

PREN (Pitting Resistance) 2.2
27
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
180 to 190
Resilience: Unit (Modulus of Resilience), kJ/m3 4120
3610 to 4100
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 84
47 to 53
Strength to Weight: Bending, points 51
34 to 37
Thermal Diffusivity, mm2/s 10
4.4
Thermal Shock Resistance, points 70
44 to 49

Alloy Composition

Carbon (C), % 0.38 to 0.43
0.1 to 0.15
Chromium (Cr), % 0.7 to 1.0
15 to 16
Iron (Fe), % 93.3 to 94.8
73.2 to 77.7
Manganese (Mn), % 0.65 to 0.9
0.5 to 1.3
Molybdenum (Mo), % 0.35 to 0.45
2.5 to 3.2
Nickel (Ni), % 1.7 to 2.0
4.0 to 5.0
Niobium (Nb), % 0
0.1 to 0.5
Nitrogen (N), % 0
0.070 to 0.13
Phosphorus (P), % 0 to 0.012
0 to 0.040
Silicon (Si), % 1.5 to 1.8
0 to 0.5
Sulfur (S), % 0 to 0.012
0 to 0.030
Vanadium (V), % 0.050 to 0.1
0