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SAE-AISI 4340M Steel vs. S32906 Stainless Steel

Both SAE-AISI 4340M steel and S32906 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 64% of their average alloy composition in common. There are 33 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 4340M steel and the bottom bar is S32906 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 710
270
Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 6.0
28
Fatigue Strength, MPa 690
460
Poisson's Ratio 0.29
0.27
Rockwell C Hardness 55
28
Shear Modulus, GPa 72
81
Shear Strength, MPa 1360
550
Tensile Strength: Ultimate (UTS), MPa 2340
850
Tensile Strength: Yield (Proof), MPa 1240
620

Thermal Properties

Latent Heat of Fusion, J/g 280
300
Maximum Temperature: Mechanical, °C 430
1100
Melting Completion (Liquidus), °C 1440
1430
Melting Onset (Solidus), °C 1400
1380
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 38
13
Thermal Expansion, µm/m-K 13
13

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
20
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 1.9
3.7
Embodied Energy, MJ/kg 26
52
Embodied Water, L/kg 55
190

Common Calculations

PREN (Pitting Resistance) 2.2
41
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
220
Resilience: Unit (Modulus of Resilience), kJ/m3 4120
950
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 84
30
Strength to Weight: Bending, points 51
26
Thermal Diffusivity, mm2/s 10
3.6
Thermal Shock Resistance, points 70
23

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.030
Chromium (Cr), % 0.7 to 1.0
28 to 30
Copper (Cu), % 0
0 to 0.8
Iron (Fe), % 93.3 to 94.8
56.6 to 63.6
Manganese (Mn), % 0.65 to 0.9
0.8 to 1.5
Molybdenum (Mo), % 0.35 to 0.45
1.5 to 2.6
Nickel (Ni), % 1.7 to 2.0
5.8 to 7.5
Nitrogen (N), % 0
0.3 to 0.4
Phosphorus (P), % 0 to 0.012
0 to 0.030
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