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S81921 Stainless Steel vs. EN 1.7709 Steel

Both S81921 stainless steel and EN 1.7709 steel are iron alloys. They have 74% of their average alloy composition in common. There are 26 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is S81921 stainless steel and the bottom bar is EN 1.7709 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 260
200 to 230
Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 79
73
Tensile Strength: Ultimate (UTS), MPa 710
650 to 780

Thermal Properties

Latent Heat of Fusion, J/g 290
250
Maximum Temperature: Mechanical, °C 990
440
Melting Completion (Liquidus), °C 1430
1470
Melting Onset (Solidus), °C 1390
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 15
33
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
7.5
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 14
3.4
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 2.9
2.3
Embodied Energy, MJ/kg 41
32
Embodied Water, L/kg 150
56

Common Calculations

PREN (Pitting Resistance) 28
3.6
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 25
23 to 27
Strength to Weight: Bending, points 23
21 to 24
Thermal Diffusivity, mm2/s 4.0
8.9
Thermal Shock Resistance, points 20
22 to 26

Alloy Composition

Aluminum (Al), % 0
0 to 0.030
Carbon (C), % 0 to 0.030
0.17 to 0.25
Chromium (Cr), % 19 to 22
1.2 to 1.5
Iron (Fe), % 66.7 to 75.9
95.2 to 97.5
Manganese (Mn), % 2.0 to 4.0
0.4 to 0.8
Molybdenum (Mo), % 1.0 to 2.0
0.55 to 0.8
Nickel (Ni), % 2.0 to 4.0
0 to 0.6
Nitrogen (N), % 0.14 to 0.2
0
Phosphorus (P), % 0 to 0.040
0 to 0.025
Silicon (Si), % 0 to 1.0
0 to 0.4
Sulfur (S), % 0 to 0.030
0 to 0.030
Vanadium (V), % 0
0.2 to 0.35