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SAE-AISI 1040 Steel vs. S40945 Stainless Steel

Both SAE-AISI 1040 steel and S40945 stainless steel are iron alloys. They have 88% 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 1040 steel and the bottom bar is S40945 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 180
160
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 13 to 20
25
Fatigue Strength, MPa 220 to 340
160
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
75
Shear Strength, MPa 350 to 390
270
Tensile Strength: Ultimate (UTS), MPa 570 to 640
430
Tensile Strength: Yield (Proof), MPa 320 to 530
230

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Maximum Temperature: Mechanical, °C 400
710
Melting Completion (Liquidus), °C 1460
1450
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 51
26
Thermal Expansion, µm/m-K 12
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.0
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 8.0
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
8.0
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.4
2.2
Embodied Energy, MJ/kg 18
31
Embodied Water, L/kg 46
94

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 79 to 96
89
Resilience: Unit (Modulus of Resilience), kJ/m3 270 to 760
140
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 20 to 23
15
Strength to Weight: Bending, points 19 to 21
16
Thermal Diffusivity, mm2/s 14
6.9
Thermal Shock Resistance, points 18 to 20
15

Alloy Composition

Carbon (C), % 0.37 to 0.44
0 to 0.030
Chromium (Cr), % 0
10.5 to 11.7
Iron (Fe), % 98.6 to 99.03
85.1 to 89.3
Manganese (Mn), % 0.6 to 0.9
0 to 1.0
Nickel (Ni), % 0
0 to 0.5
Niobium (Nb), % 0
0.18 to 0.4
Nitrogen (N), % 0
0 to 0.030
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0
0 to 1.0
Sulfur (S), % 0 to 0.050
0 to 0.030
Titanium (Ti), % 0
0.050 to 0.2