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SAE-AISI 1144 Steel vs. S40945 Stainless Steel

Both SAE-AISI 1144 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 1144 steel and the bottom bar is S40945 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220 to 230
160
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11 to 17
25
Fatigue Strength, MPa 280 to 430
160
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
75
Shear Strength, MPa 460 to 510
270
Tensile Strength: Ultimate (UTS), MPa 750 to 840
430
Tensile Strength: Yield (Proof), MPa 420 to 690
230

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Maximum Temperature: Mechanical, °C 400
710
Melting Completion (Liquidus), °C 1450
1450
Melting Onset (Solidus), °C 1410
1410
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 51
26
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 8.2
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
8.0
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.4
2.2
Embodied Energy, MJ/kg 19
31
Embodied Water, L/kg 47
94

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 91 to 110
89
Resilience: Unit (Modulus of Resilience), kJ/m3 480 to 1290
140
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 27 to 30
15
Strength to Weight: Bending, points 23 to 25
16
Thermal Diffusivity, mm2/s 14
6.9
Thermal Shock Resistance, points 22 to 24
15

Alloy Composition

Carbon (C), % 0.4 to 0.48
0 to 0.030
Chromium (Cr), % 0
10.5 to 11.7
Iron (Fe), % 97.5 to 98
85.1 to 89.3
Manganese (Mn), % 1.4 to 1.7
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), % 0.24 to 0.33
0 to 0.030
Titanium (Ti), % 0
0.050 to 0.2