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N08028 Stainless Steel vs. SAE-AISI 4340M Steel

Both N08028 stainless steel and SAE-AISI 4340M steel are iron alloys. Both are furnished in the annealed condition. They have a modest 39% of their average alloy composition in common, which, by itself, doesn't mean much. There are 30 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 N08028 stainless steel and the bottom bar is SAE-AISI 4340M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
710
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 45
6.0
Fatigue Strength, MPa 220
690
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 80
72
Shear Strength, MPa 400
1360
Tensile Strength: Ultimate (UTS), MPa 570
2340
Tensile Strength: Yield (Proof), MPa 240
1240

Thermal Properties

Latent Heat of Fusion, J/g 320
280
Maximum Temperature: Mechanical, °C 1100
430
Melting Completion (Liquidus), °C 1420
1440
Melting Onset (Solidus), °C 1370
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 12
38
Thermal Expansion, µm/m-K 16
13

Otherwise Unclassified Properties

Base Metal Price, % relative 37
3.9
Density, g/cm3 8.1
7.8
Embodied Carbon, kg CO2/kg material 6.4
1.9
Embodied Energy, MJ/kg 89
26
Embodied Water, L/kg 240
55

Common Calculations

PREN (Pitting Resistance) 39
2.2
Resilience: Ultimate (Unit Rupture Work), MJ/m3 210
120
Resilience: Unit (Modulus of Resilience), kJ/m3 140
4120
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 19
84
Strength to Weight: Bending, points 19
51
Thermal Diffusivity, mm2/s 3.2
10
Thermal Shock Resistance, points 12
70

Alloy Composition

Carbon (C), % 0 to 0.030
0.38 to 0.43
Chromium (Cr), % 26 to 28
0.7 to 1.0
Copper (Cu), % 0.6 to 1.4
0
Iron (Fe), % 29 to 40.4
93.3 to 94.8
Manganese (Mn), % 0 to 2.5
0.65 to 0.9
Molybdenum (Mo), % 3.0 to 4.0
0.35 to 0.45
Nickel (Ni), % 30 to 34
1.7 to 2.0
Phosphorus (P), % 0 to 0.030
0 to 0.012
Silicon (Si), % 0 to 1.0
1.5 to 1.8
Sulfur (S), % 0 to 0.030
0 to 0.012
Vanadium (V), % 0
0.050 to 0.1