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SAE-AISI A9 Steel vs. S20910 Stainless Steel

Both SAE-AISI A9 steel and S20910 stainless steel are iron alloys. They have 66% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI A9 steel and the bottom bar is S20910 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 74
79
Tensile Strength: Ultimate (UTS), MPa 770 to 2030
780 to 940

Thermal Properties

Latent Heat of Fusion, J/g 280
300
Melting Completion (Liquidus), °C 1460
1420
Melting Onset (Solidus), °C 1410
1380
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 35
13
Thermal Expansion, µm/m-K 12
16

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
22
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 4.7
4.8
Embodied Energy, MJ/kg 70
68
Embodied Water, L/kg 82
180

Common Calculations

PREN (Pitting Resistance) 10
34
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 28 to 73
28 to 33
Strength to Weight: Bending, points 24 to 46
24 to 27
Thermal Diffusivity, mm2/s 9.6
3.6
Thermal Shock Resistance, points 25 to 66
17 to 21

Alloy Composition

Carbon (C), % 0.45 to 0.55
0 to 0.060
Chromium (Cr), % 4.8 to 5.5
20.5 to 23.5
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 87 to 90.5
52.1 to 62.1
Manganese (Mn), % 0 to 0.5
4.0 to 6.0
Molybdenum (Mo), % 1.3 to 1.8
1.5 to 3.0
Nickel (Ni), % 1.3 to 1.8
11.5 to 13.5
Niobium (Nb), % 0
0.1 to 0.3
Nitrogen (N), % 0
0.2 to 0.4
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 1.0 to 1.2
0 to 0.75
Sulfur (S), % 0 to 0.030
0 to 0.030
Vanadium (V), % 0.8 to 1.4
0.1 to 0.3

Comparable Variants