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ASTM A231 Spring Steel vs. EN 1.4125 Stainless Steel

Both ASTM A231 spring steel and EN 1.4125 stainless 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 ASTM A231 spring steel and the bottom bar is EN 1.4125 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 540
250
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 14
19
Fatigue Strength, MPa 1000
300
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
77
Shear Strength, MPa 1080
500
Tensile Strength: Ultimate (UTS), MPa 1790
800
Tensile Strength: Yield (Proof), MPa 1570
470

Thermal Properties

Latent Heat of Fusion, J/g 250
280
Maximum Temperature: Mechanical, °C 420
870
Melting Completion (Liquidus), °C 1460
1430
Melting Onset (Solidus), °C 1410
1390
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 52
15
Thermal Expansion, µm/m-K 13
10

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 2.3
9.0
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 2.0
2.3
Embodied Energy, MJ/kg 28
32
Embodied Water, L/kg 51
120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
130
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 64
29
Strength to Weight: Bending, points 42
25
Thermal Diffusivity, mm2/s 14
4.1
Thermal Shock Resistance, points 53
29

Alloy Composition

Carbon (C), % 0.48 to 0.53
1.0 to 1.2
Chromium (Cr), % 0.8 to 1.1
16 to 18
Iron (Fe), % 96.7 to 97.7
78 to 82.7
Manganese (Mn), % 0.7 to 0.9
0 to 1.0
Molybdenum (Mo), % 0
0.4 to 0.8
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.015
Vanadium (V), % 0.15 to 0.3
0