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EN 1.7231 Steel vs. S40930 Stainless Steel

Both EN 1.7231 steel and S40930 stainless steel are iron alloys. They have 89% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is EN 1.7231 steel and the bottom bar is S40930 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 240 to 280
160
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11 to 12
23
Fatigue Strength, MPa 360 to 500
130
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
75
Tensile Strength: Ultimate (UTS), MPa 790 to 930
430
Tensile Strength: Yield (Proof), MPa 570 to 800
190

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Maximum Temperature: Mechanical, °C 420
710
Melting Completion (Liquidus), °C 1460
1450
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 46
25
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 2.5
8.5
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.5
2.3
Embodied Energy, MJ/kg 20
32
Embodied Water, L/kg 51
94

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 87 to 100
80
Resilience: Unit (Modulus of Resilience), kJ/m3 870 to 1700
94
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 28 to 33
16
Strength to Weight: Bending, points 24 to 27
16
Thermal Diffusivity, mm2/s 12
6.7
Thermal Shock Resistance, points 23 to 27
16

Alloy Composition

Carbon (C), % 0.38 to 0.45
0 to 0.030
Chromium (Cr), % 0.8 to 1.2
10.5 to 11.7
Iron (Fe), % 96.4 to 98.1
84.7 to 89.4
Manganese (Mn), % 0.6 to 1.0
0 to 1.0
Molybdenum (Mo), % 0.15 to 0.3
0
Nickel (Ni), % 0
0 to 0.5
Niobium (Nb), % 0
0.080 to 0.75
Nitrogen (N), % 0
0 to 0.030
Phosphorus (P), % 0 to 0.025
0 to 0.040
Silicon (Si), % 0 to 0.6
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.020
Titanium (Ti), % 0
0.050 to 0.2