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ASTM A227 Spring Steel vs. S31727 Stainless Steel

Both ASTM A227 spring steel and S31727 stainless steel are iron alloys. They have 58% of their average alloy composition in common. There are 26 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is ASTM A227 spring steel and the bottom bar is S31727 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 500 to 640
190
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 12
40
Fatigue Strength, MPa 900 to 1160
240
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
78
Shear Strength, MPa 1030 to 1330
430
Tensile Strength: Ultimate (UTS), MPa 1720 to 2220
630
Tensile Strength: Yield (Proof), MPa 1430 to 1850
270

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Maximum Temperature: Mechanical, °C 400
1010
Melting Completion (Liquidus), °C 1450
1440
Melting Onset (Solidus), °C 1410
1390
Specific Heat Capacity, J/kg-K 470
470
Thermal Expansion, µm/m-K 12
16

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
24
Density, g/cm3 7.8
8.0
Embodied Carbon, kg CO2/kg material 1.4
4.7
Embodied Energy, MJ/kg 19
64
Embodied Water, L/kg 46
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200 to 260
200
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 61 to 79
22
Strength to Weight: Bending, points 41 to 48
20
Thermal Shock Resistance, points 55 to 71
14

Alloy Composition

Carbon (C), % 0.45 to 0.85
0 to 0.030
Chromium (Cr), % 0
17.5 to 19
Copper (Cu), % 0
2.8 to 4.0
Iron (Fe), % 97.4 to 99.1
53.7 to 61.3
Manganese (Mn), % 0.3 to 1.3
0 to 1.0
Molybdenum (Mo), % 0
3.8 to 4.5
Nickel (Ni), % 0
14.5 to 16.5
Nitrogen (N), % 0
0.15 to 0.21
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 0.15 to 0.35
0 to 1.0
Sulfur (S), % 0 to 0.050
0 to 0.030