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SAE-AISI 1144 Steel vs. S44800 Stainless Steel

Both SAE-AISI 1144 steel and S44800 stainless steel are iron alloys. They have 65% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 1144 steel and the bottom bar is S44800 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220 to 230
190
Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 11 to 17
23
Fatigue Strength, MPa 280 to 430
300
Poisson's Ratio 0.29
0.27
Reduction in Area, % 34 to 40
45
Shear Modulus, GPa 72
82
Shear Strength, MPa 460 to 510
370
Tensile Strength: Ultimate (UTS), MPa 750 to 840
590
Tensile Strength: Yield (Proof), MPa 420 to 690
450

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Maximum Temperature: Mechanical, °C 400
1100
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1410
1410
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 51
17
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
2.6
Electrical Conductivity: Equal Weight (Specific), % IACS 8.2
3.0

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
19
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.4
3.8
Embodied Energy, MJ/kg 19
52
Embodied Water, L/kg 47
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 91 to 110
120
Resilience: Unit (Modulus of Resilience), kJ/m3 480 to 1290
480
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 27 to 30
21
Strength to Weight: Bending, points 23 to 25
20
Thermal Diffusivity, mm2/s 14
4.6
Thermal Shock Resistance, points 22 to 24
19

Alloy Composition

Carbon (C), % 0.4 to 0.48
0 to 0.010
Chromium (Cr), % 0
28 to 30
Copper (Cu), % 0
0 to 0.15
Iron (Fe), % 97.5 to 98
62.6 to 66.5
Manganese (Mn), % 1.4 to 1.7
0 to 0.3
Molybdenum (Mo), % 0
3.5 to 4.2
Nickel (Ni), % 0
2.0 to 2.5
Nitrogen (N), % 0
0 to 0.020
Phosphorus (P), % 0 to 0.040
0 to 0.025
Silicon (Si), % 0
0 to 0.2
Sulfur (S), % 0.24 to 0.33
0 to 0.020