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SAE-AISI 1045 Steel vs. S44800 Stainless Steel

Both SAE-AISI 1045 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 1045 steel and the bottom bar is S44800 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180 to 190
190
Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 13 to 18
23
Fatigue Strength, MPa 220 to 370
300
Poisson's Ratio 0.29
0.27
Reduction in Area, % 40 to 51
45
Shear Modulus, GPa 72
82
Shear Strength, MPa 380 to 410
370
Tensile Strength: Ultimate (UTS), MPa 620 to 680
590
Tensile Strength: Yield (Proof), MPa 330 to 580
450

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Maximum Temperature: Mechanical, °C 400
1100
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 51
17
Thermal Expansion, µm/m-K 12
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.0
2.6
Electrical Conductivity: Equal Weight (Specific), % IACS 8.1
3.0

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
19
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.4
3.8
Embodied Energy, MJ/kg 18
52
Embodied Water, L/kg 46
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 93
120
Resilience: Unit (Modulus of Resilience), kJ/m3 300 to 900
480
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 22 to 24
21
Strength to Weight: Bending, points 21 to 22
20
Thermal Diffusivity, mm2/s 14
4.6
Thermal Shock Resistance, points 20 to 22
19

Alloy Composition

Carbon (C), % 0.43 to 0.5
0 to 0.010
Chromium (Cr), % 0
28 to 30
Copper (Cu), % 0
0 to 0.15
Iron (Fe), % 98.5 to 99
62.6 to 66.5
Manganese (Mn), % 0.6 to 0.9
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 to 0.050
0 to 0.020