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S21800 Stainless Steel vs. SAE-AISI 4145 Steel

Both S21800 stainless steel and SAE-AISI 4145 steel are iron alloys. Both are furnished in the annealed condition. They have 64% of their average alloy composition in common. There are 28 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is S21800 stainless steel and the bottom bar is SAE-AISI 4145 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210
310
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 40
16
Fatigue Strength, MPa 330
240
Poisson's Ratio 0.28
0.29
Reduction in Area, % 62
46
Shear Modulus, GPa 75
73
Shear Strength, MPa 510
360
Tensile Strength: Ultimate (UTS), MPa 740
580
Tensile Strength: Yield (Proof), MPa 390
360

Thermal Properties

Latent Heat of Fusion, J/g 340
250
Maximum Temperature: Mechanical, °C 900
420
Melting Completion (Liquidus), °C 1360
1460
Melting Onset (Solidus), °C 1310
1420
Specific Heat Capacity, J/kg-K 500
470
Thermal Expansion, µm/m-K 16
13

Otherwise Unclassified Properties

Base Metal Price, % relative 15
2.4
Density, g/cm3 7.5
7.8
Embodied Carbon, kg CO2/kg material 3.1
1.5
Embodied Energy, MJ/kg 45
20
Embodied Water, L/kg 150
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 250
80
Resilience: Unit (Modulus of Resilience), kJ/m3 390
350
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 26
24
Strength to Weight: Axial, points 27
21
Strength to Weight: Bending, points 24
20
Thermal Shock Resistance, points 17
17

Alloy Composition

Carbon (C), % 0 to 0.1
0.43 to 0.48
Chromium (Cr), % 16 to 18
0.8 to 1.1
Iron (Fe), % 59.1 to 65.4
96.7 to 97.7
Manganese (Mn), % 7.0 to 9.0
0.75 to 1.0
Molybdenum (Mo), % 0
0.15 to 0.25
Nickel (Ni), % 8.0 to 9.0
0
Nitrogen (N), % 0.080 to 0.18
0
Phosphorus (P), % 0 to 0.060
0 to 0.035
Silicon (Si), % 3.5 to 4.5
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.040