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S31727 Stainless Steel vs. ASTM A229 Spring Steel

Both S31727 stainless steel and ASTM A229 spring steel are iron alloys. They have 58% of their average alloy composition in common. There are 27 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is S31727 stainless steel and the bottom bar is ASTM A229 spring steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
490 to 550
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 40
14
Fatigue Strength, MPa 240
710 to 790
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 78
72
Shear Strength, MPa 430
1020 to 1140
Tensile Strength: Ultimate (UTS), MPa 630
1690 to 1890
Tensile Strength: Yield (Proof), MPa 270
1100 to 1230

Thermal Properties

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

Otherwise Unclassified Properties

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

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200
200 to 230
Resilience: Unit (Modulus of Resilience), kJ/m3 190
3260 to 4080
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 22
60 to 67
Strength to Weight: Bending, points 20
40 to 43
Thermal Shock Resistance, points 14
54 to 60

Alloy Composition

Carbon (C), % 0 to 0.030
0.55 to 0.85
Chromium (Cr), % 17.5 to 19
0
Copper (Cu), % 2.8 to 4.0
0
Iron (Fe), % 53.7 to 61.3
97.5 to 99
Manganese (Mn), % 0 to 1.0
0.3 to 1.2
Molybdenum (Mo), % 3.8 to 4.5
0
Nickel (Ni), % 14.5 to 16.5
0
Nitrogen (N), % 0.15 to 0.21
0
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0 to 1.0
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.050