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EN 1.4125 Stainless Steel vs. EN 1.7231 Steel

Both EN 1.4125 stainless steel and EN 1.7231 steel are iron alloys. They have 83% of their average alloy composition in common. There are 30 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 1.4125 stainless steel and the bottom bar is EN 1.7231 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 250
240 to 280
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 19
11 to 12
Fatigue Strength, MPa 300
360 to 500
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
73
Tensile Strength: Ultimate (UTS), MPa 800
790 to 930
Tensile Strength: Yield (Proof), MPa 470
570 to 800

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Maximum Temperature: Mechanical, °C 870
420
Melting Completion (Liquidus), °C 1430
1460
Melting Onset (Solidus), °C 1390
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 15
46
Thermal Expansion, µm/m-K 10
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
2.5
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 2.3
1.5
Embodied Energy, MJ/kg 32
20
Embodied Water, L/kg 120
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
87 to 100
Resilience: Unit (Modulus of Resilience), kJ/m3 570
870 to 1700
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 29
28 to 33
Strength to Weight: Bending, points 25
24 to 27
Thermal Diffusivity, mm2/s 4.1
12
Thermal Shock Resistance, points 29
23 to 27

Alloy Composition

Carbon (C), % 1.0 to 1.2
0.38 to 0.45
Chromium (Cr), % 16 to 18
0.8 to 1.2
Iron (Fe), % 78 to 82.7
96.4 to 98.1
Manganese (Mn), % 0 to 1.0
0.6 to 1.0
Molybdenum (Mo), % 0.4 to 0.8
0.15 to 0.3
Phosphorus (P), % 0 to 0.040
0 to 0.025
Silicon (Si), % 0 to 1.0
0 to 0.6
Sulfur (S), % 0 to 0.015
0 to 0.030