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EN 1.7725 Steel vs. S40945 Stainless Steel

Both EN 1.7725 steel and S40945 stainless steel are iron alloys. They have 90% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is EN 1.7725 steel and the bottom bar is S40945 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 250 to 300
160
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 14
25
Fatigue Strength, MPa 390 to 550
160
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
75
Tensile Strength: Ultimate (UTS), MPa 830 to 1000
430
Tensile Strength: Yield (Proof), MPa 610 to 860
230

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Maximum Temperature: Mechanical, °C 440
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 7.4
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 2.9
8.0
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.8
2.2
Embodied Energy, MJ/kg 24
31
Embodied Water, L/kg 54
94

Common Calculations

PREN (Pitting Resistance) 2.8
11
Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 130
89
Resilience: Unit (Modulus of Resilience), kJ/m3 980 to 1940
140
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 29 to 35
15
Strength to Weight: Bending, points 25 to 28
16
Thermal Diffusivity, mm2/s 11
6.9
Thermal Shock Resistance, points 24 to 29
15

Alloy Composition

Carbon (C), % 0.27 to 0.34
0 to 0.030
Chromium (Cr), % 1.3 to 1.7
10.5 to 11.7
Iron (Fe), % 95.7 to 97.5
85.1 to 89.3
Manganese (Mn), % 0.6 to 1.0
0 to 1.0
Molybdenum (Mo), % 0.3 to 0.5
0
Nickel (Ni), % 0
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 to 0.6
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Titanium (Ti), % 0
0.050 to 0.2
Vanadium (V), % 0.050 to 0.15
0