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EN 1.4931 Steel vs. S81921 Stainless Steel

Both EN 1.4931 steel and S81921 stainless steel are iron alloys. They have 86% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is EN 1.4931 steel and the bottom bar is S81921 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 240
260
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 17
29
Fatigue Strength, MPa 410
370
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
79
Tensile Strength: Ultimate (UTS), MPa 810
710
Tensile Strength: Yield (Proof), MPa 620
500

Thermal Properties

Latent Heat of Fusion, J/g 270
290
Maximum Temperature: Mechanical, °C 600
990
Melting Completion (Liquidus), °C 1460
1430
Melting Onset (Solidus), °C 1420
1390
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 24
15
Thermal Expansion, µm/m-K 14
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 9.8
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 11
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 8.5
14
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 2.9
2.9
Embodied Energy, MJ/kg 42
41
Embodied Water, L/kg 100
150

Common Calculations

PREN (Pitting Resistance) 16
28
Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
180
Resilience: Unit (Modulus of Resilience), kJ/m3 970
630
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 29
25
Strength to Weight: Bending, points 25
23
Thermal Diffusivity, mm2/s 6.5
4.0
Thermal Shock Resistance, points 22
20

Alloy Composition

Carbon (C), % 0.2 to 0.26
0 to 0.030
Chromium (Cr), % 11.3 to 12.2
19 to 22
Iron (Fe), % 83.2 to 86.8
66.7 to 75.9
Manganese (Mn), % 0.5 to 0.8
2.0 to 4.0
Molybdenum (Mo), % 1.0 to 1.2
1.0 to 2.0
Nickel (Ni), % 0 to 1.0
2.0 to 4.0
Nitrogen (N), % 0
0.14 to 0.2
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0 to 0.4
0 to 1.0
Sulfur (S), % 0 to 0.020
0 to 0.030
Tungsten (W), % 0 to 0.5
0
Vanadium (V), % 0.25 to 0.35
0