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SAE-AISI 9255 Steel vs. S21640 Stainless Steel

Both SAE-AISI 9255 steel and S21640 stainless steel are iron alloys. Both are furnished in the annealed condition. 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 (2, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 9255 steel and the bottom bar is S21640 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200
230
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 21
46
Fatigue Strength, MPa 270
320
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
78
Shear Strength, MPa 430
520
Tensile Strength: Ultimate (UTS), MPa 680
740
Tensile Strength: Yield (Proof), MPa 390
350

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Maximum Temperature: Mechanical, °C 400
940
Melting Completion (Liquidus), °C 1430
1430
Melting Onset (Solidus), °C 1390
1380
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 46
15
Thermal Expansion, µm/m-K 13
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
2.8

Otherwise Unclassified Properties

Base Metal Price, % relative 2.0
17
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 1.5
3.6
Embodied Energy, MJ/kg 20
51
Embodied Water, L/kg 46
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
280
Resilience: Unit (Modulus of Resilience), kJ/m3 400
300
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 24
27
Strength to Weight: Bending, points 22
23
Thermal Diffusivity, mm2/s 13
4.0
Thermal Shock Resistance, points 21
16

Alloy Composition

Carbon (C), % 0.51 to 0.59
0 to 0.080
Chromium (Cr), % 0
17.5 to 19.5
Iron (Fe), % 96.2 to 97
63 to 74.3
Manganese (Mn), % 0.7 to 1.0
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 0.035
0 to 0.060
Silicon (Si), % 1.8 to 2.2
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.030