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N08031 Stainless Steel vs. SAE-AISI 4340M Steel

Both N08031 stainless steel and SAE-AISI 4340M steel are iron alloys. Both are furnished in the annealed condition. They have a modest 37% of their average alloy composition in common, which, by itself, doesn't mean much. There are 29 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is N08031 stainless steel and the bottom bar is SAE-AISI 4340M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 45
6.0
Fatigue Strength, MPa 290
690
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 81
72
Shear Strength, MPa 510
1360
Tensile Strength: Ultimate (UTS), MPa 730
2340
Tensile Strength: Yield (Proof), MPa 310
1240

Thermal Properties

Latent Heat of Fusion, J/g 310
280
Maximum Temperature: Mechanical, °C 1100
430
Melting Completion (Liquidus), °C 1440
1440
Melting Onset (Solidus), °C 1390
1400
Specific Heat Capacity, J/kg-K 460
480
Thermal Conductivity, W/m-K 12
38
Thermal Expansion, µm/m-K 18
13

Otherwise Unclassified Properties

Base Metal Price, % relative 39
3.9
Density, g/cm3 8.1
7.8
Embodied Carbon, kg CO2/kg material 7.1
1.9
Embodied Energy, MJ/kg 96
26
Embodied Water, L/kg 240
55

Common Calculations

PREN (Pitting Resistance) 52
2.2
Resilience: Ultimate (Unit Rupture Work), MJ/m3 270
120
Resilience: Unit (Modulus of Resilience), kJ/m3 230
4120
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 25
84
Strength to Weight: Bending, points 22
51
Thermal Diffusivity, mm2/s 3.1
10
Thermal Shock Resistance, points 14
70

Alloy Composition

Carbon (C), % 0 to 0.015
0.38 to 0.43
Chromium (Cr), % 26 to 28
0.7 to 1.0
Copper (Cu), % 1.0 to 1.4
0
Iron (Fe), % 29 to 36.9
93.3 to 94.8
Manganese (Mn), % 0 to 2.0
0.65 to 0.9
Molybdenum (Mo), % 6.0 to 7.0
0.35 to 0.45
Nickel (Ni), % 30 to 32
1.7 to 2.0
Nitrogen (N), % 0.15 to 0.25
0
Phosphorus (P), % 0 to 0.020
0 to 0.012
Silicon (Si), % 0 to 0.3
1.5 to 1.8
Sulfur (S), % 0 to 0.010
0 to 0.012
Vanadium (V), % 0
0.050 to 0.1