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SAE-AISI 1144 Steel vs. S21640 Stainless Steel

Both SAE-AISI 1144 steel and S21640 stainless steel are iron alloys. They have 70% of their average alloy composition in common. There are 31 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 S21640 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220 to 230
230
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 11 to 17
46
Fatigue Strength, MPa 280 to 430
320
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
78
Shear Strength, MPa 460 to 510
520
Tensile Strength: Ultimate (UTS), MPa 750 to 840
740
Tensile Strength: Yield (Proof), MPa 420 to 690
350

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Maximum Temperature: Mechanical, °C 400
940
Melting Completion (Liquidus), °C 1450
1430
Melting Onset (Solidus), °C 1410
1380
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 51
15
Thermal Expansion, µm/m-K 13
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.2
2.8

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
17
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 1.4
3.6
Embodied Energy, MJ/kg 19
51
Embodied Water, L/kg 47
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 91 to 110
280
Resilience: Unit (Modulus of Resilience), kJ/m3 480 to 1290
300
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 27 to 30
27
Strength to Weight: Bending, points 23 to 25
23
Thermal Diffusivity, mm2/s 14
4.0
Thermal Shock Resistance, points 22 to 24
16

Alloy Composition

Carbon (C), % 0.4 to 0.48
0 to 0.080
Chromium (Cr), % 0
17.5 to 19.5
Iron (Fe), % 97.5 to 98
63 to 74.3
Manganese (Mn), % 1.4 to 1.7
3.5 to 6.5
Molybdenum (Mo), % 0
0.5 to 2.0
Nickel (Ni), % 0
4.0 to 6.5
Niobium (Nb), % 0
0.1 to 1.0
Nitrogen (N), % 0
0.080 to 0.3
Phosphorus (P), % 0 to 0.040
0 to 0.060
Silicon (Si), % 0
0 to 1.0
Sulfur (S), % 0.24 to 0.33
0 to 0.030