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SAE-AISI 4140 Steel vs. N08700 Stainless Steel

Both SAE-AISI 4140 steel and N08700 stainless steel are iron alloys. They have 50% of their average alloy composition in common. There are 31 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 4140 steel and the bottom bar is N08700 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200 to 310
170
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 11 to 26
32
Fatigue Strength, MPa 360 to 650
210
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
79
Shear Strength, MPa 410 to 660
410
Tensile Strength: Ultimate (UTS), MPa 690 to 1080
620
Tensile Strength: Yield (Proof), MPa 590 to 990
270

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Maximum Temperature: Mechanical, °C 420
1100
Melting Completion (Liquidus), °C 1460
1450
Melting Onset (Solidus), °C 1420
1400
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 43
13
Thermal Expansion, µm/m-K 13
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
1.9

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
32
Density, g/cm3 7.8
8.1
Embodied Carbon, kg CO2/kg material 1.5
6.0
Embodied Energy, MJ/kg 20
82
Embodied Water, L/kg 51
200

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 74 to 180
160
Resilience: Unit (Modulus of Resilience), kJ/m3 920 to 2590
180
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 25 to 38
21
Strength to Weight: Bending, points 22 to 30
20
Thermal Diffusivity, mm2/s 12
3.5
Thermal Shock Resistance, points 20 to 32
14

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.040
Chromium (Cr), % 0.8 to 1.1
19 to 23
Copper (Cu), % 0
0 to 0.5
Iron (Fe), % 96.8 to 97.8
42 to 52.7
Manganese (Mn), % 0.75 to 1.0
0 to 2.0
Molybdenum (Mo), % 0.15 to 0.25
4.3 to 5.0
Nickel (Ni), % 0
24 to 26
Niobium (Nb), % 0
0 to 0.4
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.030