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EN 1.7779 Steel vs. S40945 Stainless Steel

Both EN 1.7779 steel and S40945 stainless steel are iron alloys. They have a moderately high 91% 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 1.7779 steel and the bottom bar is S40945 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 240
160
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 16
25
Fatigue Strength, MPa 430
160
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
75
Shear Strength, MPa 500
270
Tensile Strength: Ultimate (UTS), MPa 810
430
Tensile Strength: Yield (Proof), MPa 660
230

Thermal Properties

Latent Heat of Fusion, J/g 260
270
Maximum Temperature: Mechanical, °C 470
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 39
26
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.7
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 8.9
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 4.0
8.0
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.8
2.2
Embodied Energy, MJ/kg 41
31
Embodied Water, L/kg 64
94

Common Calculations

PREN (Pitting Resistance) 5.0
11
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
89
Resilience: Unit (Modulus of Resilience), kJ/m3 1150
140
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 29
15
Strength to Weight: Bending, points 25
16
Thermal Diffusivity, mm2/s 11
6.9
Thermal Shock Resistance, points 23
15

Alloy Composition

Aluminum (Al), % 0 to 0.040
0
Carbon (C), % 0.17 to 0.23
0 to 0.030
Chromium (Cr), % 3.0 to 3.3
10.5 to 11.7
Copper (Cu), % 0 to 0.3
0
Iron (Fe), % 93.8 to 95.4
85.1 to 89.3
Manganese (Mn), % 0.3 to 0.5
0 to 1.0
Molybdenum (Mo), % 0.5 to 0.6
0
Nickel (Ni), % 0 to 0.3
0 to 0.5
Niobium (Nb), % 0
0.18 to 0.4
Nitrogen (N), % 0
0 to 0.030
Phosphorus (P), % 0 to 0.025
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0 to 1.0
Sulfur (S), % 0 to 0.010
0 to 0.030
Titanium (Ti), % 0
0.050 to 0.2
Vanadium (V), % 0.45 to 0.55
0