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EN 1.4971 Stainless Steel vs. ASTM A231 Spring Steel

Both EN 1.4971 stainless steel and ASTM A231 spring steel are iron alloys. They have a modest 33% of their average alloy composition in common, which, by itself, doesn't mean much. There are 28 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is EN 1.4971 stainless steel and the bottom bar is ASTM A231 spring steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 240
540
Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 34
14
Fatigue Strength, MPa 270
1000
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 81
73
Shear Strength, MPa 530
1080
Tensile Strength: Ultimate (UTS), MPa 800
1790
Tensile Strength: Yield (Proof), MPa 340
1570

Thermal Properties

Latent Heat of Fusion, J/g 300
250
Maximum Temperature: Mechanical, °C 1100
420
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1410
1410
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 13
52
Thermal Expansion, µm/m-K 15
13

Otherwise Unclassified Properties

Base Metal Price, % relative 70
2.3
Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 7.6
2.0
Embodied Energy, MJ/kg 110
28
Embodied Water, L/kg 300
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 220
230
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 26
64
Strength to Weight: Bending, points 23
42
Thermal Diffusivity, mm2/s 3.4
14
Thermal Shock Resistance, points 19
53

Alloy Composition

Carbon (C), % 0.080 to 0.16
0.48 to 0.53
Chromium (Cr), % 20 to 22.5
0.8 to 1.1
Cobalt (Co), % 18.5 to 21
0
Iron (Fe), % 24.3 to 37.1
96.7 to 97.7
Manganese (Mn), % 0 to 2.0
0.7 to 0.9
Molybdenum (Mo), % 2.5 to 3.5
0
Nickel (Ni), % 19 to 21
0
Niobium (Nb), % 0.75 to 1.3
0
Nitrogen (N), % 0.1 to 0.2
0
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0 to 1.0
0.15 to 0.35
Sulfur (S), % 0 to 0.015
0 to 0.040
Tungsten (W), % 2.0 to 3.0
0
Vanadium (V), % 0
0.15 to 0.3