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EN 1.4640 Stainless Steel vs. ASTM A231 Spring Steel

Both EN 1.4640 stainless steel and ASTM A231 spring steel are iron alloys. They have 73% 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 1.4640 stainless steel and the bottom bar is ASTM A231 spring steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190 to 200
540
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 51
14
Fatigue Strength, MPa 230 to 250
1000
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
73
Shear Strength, MPa 440 to 460
1080
Tensile Strength: Ultimate (UTS), MPa 620 to 650
1790
Tensile Strength: Yield (Proof), MPa 240 to 260
1570

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Maximum Temperature: Mechanical, °C 930
420
Melting Completion (Liquidus), °C 1420
1460
Melting Onset (Solidus), °C 1380
1410
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 15
52
Thermal Expansion, µm/m-K 16
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 14
2.3
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.8
2.0
Embodied Energy, MJ/kg 40
28
Embodied Water, L/kg 150
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 250 to 260
230
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 22 to 23
64
Strength to Weight: Bending, points 21
42
Thermal Diffusivity, mm2/s 4.0
14
Thermal Shock Resistance, points 14 to 15
53

Alloy Composition

Carbon (C), % 0.030 to 0.080
0.48 to 0.53
Chromium (Cr), % 18 to 19
0.8 to 1.1
Copper (Cu), % 1.3 to 2.0
0
Iron (Fe), % 67.4 to 73.6
96.7 to 97.7
Manganese (Mn), % 1.5 to 4.0
0.7 to 0.9
Nickel (Ni), % 5.5 to 6.9
0
Nitrogen (N), % 0.030 to 0.11
0
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 0 to 0.5
0.15 to 0.35
Sulfur (S), % 0 to 0.015
0 to 0.040
Vanadium (V), % 0
0.15 to 0.3