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SAE-AISI A4 Steel vs. S20910 Stainless Steel

Both SAE-AISI A4 steel and S20910 stainless steel are iron alloys. They have 62% 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 A4 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 73
79
Tensile Strength: Ultimate (UTS), MPa 710 to 2050
780 to 940

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Melting Completion (Liquidus), °C 1450
1420
Melting Onset (Solidus), °C 1410
1380
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 40
13
Thermal Expansion, µm/m-K 12
16

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
22
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.8
4.8
Embodied Energy, MJ/kg 24
68
Embodied Water, L/kg 59
180

Common Calculations

PREN (Pitting Resistance) 5.3
34
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 25 to 73
28 to 33
Strength to Weight: Bending, points 23 to 46
24 to 27
Thermal Diffusivity, mm2/s 11
3.6
Thermal Shock Resistance, points 23 to 67
17 to 21

Alloy Composition

Carbon (C), % 1.0 to 1.1
0 to 0.060
Chromium (Cr), % 0.9 to 2.2
20.5 to 23.5
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 92 to 95.5
52.1 to 62.1
Manganese (Mn), % 1.8 to 2.2
4.0 to 6.0
Molybdenum (Mo), % 0.9 to 1.4
1.5 to 3.0
Nickel (Ni), % 0 to 0.3
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), % 0 to 0.5
0 to 0.75
Sulfur (S), % 0 to 0.030
0 to 0.030
Vanadium (V), % 0
0.1 to 0.3

Comparable Variants