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EN 1.4971 Stainless Steel vs. SAE-AISI A8 Steel

Both EN 1.4971 stainless steel and SAE-AISI A8 steel are iron alloys. They have a modest 40% of their average alloy composition in common, which, by itself, doesn't mean much. There are 22 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is EN 1.4971 stainless steel and the bottom bar is SAE-AISI A8 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 81
74
Tensile Strength: Ultimate (UTS), MPa 800
700 to 1920

Thermal Properties

Latent Heat of Fusion, J/g 300
270
Melting Completion (Liquidus), °C 1460
1480
Melting Onset (Solidus), °C 1410
1430
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 13
37
Thermal Expansion, µm/m-K 15
12

Otherwise Unclassified Properties

Base Metal Price, % relative 70
8.5
Density, g/cm3 8.4
7.9
Embodied Carbon, kg CO2/kg material 7.6
2.3
Embodied Energy, MJ/kg 110
31
Embodied Water, L/kg 300
73

Common Calculations

PREN (Pitting Resistance) 38
12
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 26
25 to 68
Strength to Weight: Bending, points 23
22 to 44
Thermal Diffusivity, mm2/s 3.4
9.9
Thermal Shock Resistance, points 19
22 to 62

Alloy Composition

Carbon (C), % 0.080 to 0.16
0.5 to 0.6
Chromium (Cr), % 20 to 22.5
4.8 to 5.5
Cobalt (Co), % 18.5 to 21
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 24.3 to 37.1
88.5 to 91.9
Manganese (Mn), % 0 to 2.0
0 to 0.5
Molybdenum (Mo), % 2.5 to 3.5
1.2 to 1.7
Nickel (Ni), % 19 to 21
0 to 0.3
Niobium (Nb), % 0.75 to 1.3
0
Nitrogen (N), % 0.1 to 0.2
0
Phosphorus (P), % 0 to 0.035
0 to 0.030
Silicon (Si), % 0 to 1.0
0.75 to 1.1
Sulfur (S), % 0 to 0.015
0 to 0.030
Tungsten (W), % 2.0 to 3.0
1.0 to 1.5