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EN 1.6956 Steel vs. S82121 Stainless Steel

Both EN 1.6956 steel and S82121 stainless steel are iron alloys. They have 76% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is EN 1.6956 steel and the bottom bar is S82121 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 370
250
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 9.6
28
Fatigue Strength, MPa 680
370
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 73
78
Shear Strength, MPa 730
470
Tensile Strength: Ultimate (UTS), MPa 1230
730
Tensile Strength: Yield (Proof), MPa 1120
510

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Maximum Temperature: Mechanical, °C 440
1020
Melting Completion (Liquidus), °C 1460
1430
Melting Onset (Solidus), °C 1420
1380
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 46
15
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.0
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 5.0
14
Density, g/cm3 7.9
7.7
Embodied Carbon, kg CO2/kg material 2.2
2.8
Embodied Energy, MJ/kg 31
40
Embodied Water, L/kg 60
150

Common Calculations

PREN (Pitting Resistance) 2.8
28
Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
180
Resilience: Unit (Modulus of Resilience), kJ/m3 3320
660
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 43
26
Strength to Weight: Bending, points 32
23
Thermal Diffusivity, mm2/s 12
4.0
Thermal Shock Resistance, points 36
20

Alloy Composition

Carbon (C), % 0.28 to 0.38
0 to 0.035
Chromium (Cr), % 1.0 to 1.7
21 to 23
Copper (Cu), % 0
0.2 to 1.2
Iron (Fe), % 92.4 to 95.3
66.7 to 75.4
Manganese (Mn), % 0.15 to 0.4
1.0 to 2.5
Molybdenum (Mo), % 0.3 to 0.6
0.3 to 1.3
Nickel (Ni), % 2.9 to 3.8
2.0 to 4.0
Nitrogen (N), % 0
0.15 to 0.25
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0 to 0.4
0 to 1.0
Sulfur (S), % 0 to 0.035
0 to 0.010
Vanadium (V), % 0.080 to 0.25
0