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SAE-AISI 1050 Steel vs. S21640 Stainless Steel

Both SAE-AISI 1050 steel and S21640 stainless steel are iron alloys. They have 69% 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 1050 steel and the bottom bar is S21640 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200 to 220
230
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 11 to 17
46
Fatigue Strength, MPa 260 to 400
320
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
78
Shear Strength, MPa 430 to 470
520
Tensile Strength: Ultimate (UTS), MPa 690 to 790
740
Tensile Strength: Yield (Proof), MPa 390 to 650
350

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Maximum Temperature: Mechanical, °C 400
940
Melting Completion (Liquidus), °C 1460
1430
Melting Onset (Solidus), °C 1420
1380
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 51
15
Thermal Expansion, µm/m-K 12
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.0
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.1
2.8

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
17
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 1.4
3.6
Embodied Energy, MJ/kg 18
51
Embodied Water, L/kg 46
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 81 to 100
280
Resilience: Unit (Modulus of Resilience), kJ/m3 400 to 1130
300
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 25 to 28
27
Strength to Weight: Bending, points 22 to 24
23
Thermal Diffusivity, mm2/s 14
4.0
Thermal Shock Resistance, points 22 to 25
16

Alloy Composition

Carbon (C), % 0.48 to 0.55
0 to 0.080
Chromium (Cr), % 0
17.5 to 19.5
Iron (Fe), % 98.5 to 98.9
63 to 74.3
Manganese (Mn), % 0.6 to 0.9
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 to 0.050
0 to 0.030