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EN 1.6958 Steel vs. S21904 Stainless Steel

Both EN 1.6958 steel and S21904 stainless steel are iron alloys. They have 69% 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 1.6958 steel and the bottom bar is S21904 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 340
210 to 300
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 16
17 to 51
Fatigue Strength, MPa 700
380 to 550
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
78
Shear Strength, MPa 700
510 to 620
Tensile Strength: Ultimate (UTS), MPa 1140
700 to 1000
Tensile Strength: Yield (Proof), MPa 1070
390 to 910

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Maximum Temperature: Mechanical, °C 450
980
Melting Completion (Liquidus), °C 1460
1400
Melting Onset (Solidus), °C 1420
1350
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 47
14
Thermal Expansion, µm/m-K 11
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.9
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 5.0
15
Density, g/cm3 7.9
7.7
Embodied Carbon, kg CO2/kg material 2.0
3.0
Embodied Energy, MJ/kg 27
43
Embodied Water, L/kg 60
160

Common Calculations

PREN (Pitting Resistance) 2.9
25
Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
160 to 310
Resilience: Unit (Modulus of Resilience), kJ/m3 3050
380 to 2070
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 40
25 to 36
Strength to Weight: Bending, points 31
23 to 29
Thermal Diffusivity, mm2/s 13
3.8
Thermal Shock Resistance, points 39
15 to 21

Alloy Composition

Aluminum (Al), % 0.0050 to 0.050
0
Carbon (C), % 0.25 to 0.3
0 to 0.040
Chromium (Cr), % 1.2 to 1.7
19 to 21.5
Iron (Fe), % 92.6 to 94.5
59.5 to 67.4
Manganese (Mn), % 0.2 to 0.5
8.0 to 10
Molybdenum (Mo), % 0.35 to 0.55
0
Nickel (Ni), % 3.3 to 3.8
5.5 to 7.5
Nitrogen (N), % 0
0.15 to 0.4
Phosphorus (P), % 0 to 0.020
0 to 0.045
Silicon (Si), % 0.15 to 0.3
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.030
Vanadium (V), % 0 to 0.12
0