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EN 1.7321 Steel vs. S31655 Stainless Steel

Both EN 1.7321 steel and S31655 stainless steel are iron alloys. They have 70% of their average alloy composition in common. There are 25 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is EN 1.7321 steel and the bottom bar is S31655 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150 to 170
210
Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
78
Tensile Strength: Ultimate (UTS), MPa 490 to 1460
710

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Maximum Temperature: Mechanical, °C 410
1010
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 45
15
Thermal Expansion, µm/m-K 13
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 2.5
17
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.5
3.3
Embodied Energy, MJ/kg 20
46
Embodied Water, L/kg 50
160

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 17 to 52
25
Strength to Weight: Bending, points 18 to 36
23
Thermal Diffusivity, mm2/s 12
4.0
Thermal Shock Resistance, points 14 to 43
16

Alloy Composition

Carbon (C), % 0.17 to 0.23
0 to 0.030
Chromium (Cr), % 0.3 to 0.6
19.5 to 21.5
Copper (Cu), % 0 to 0.25
0 to 1.0
Iron (Fe), % 97.1 to 98.4
63.2 to 71.9
Manganese (Mn), % 0.7 to 1.0
0 to 2.0
Molybdenum (Mo), % 0.4 to 0.5
0.5 to 1.5
Nickel (Ni), % 0
8.0 to 9.5
Nitrogen (N), % 0
0.14 to 0.25
Phosphorus (P), % 0 to 0.025
0 to 0.045
Silicon (Si), % 0 to 0.3
0 to 1.0
Sulfur (S), % 0 to 0.025
0 to 0.015