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ASTM A229 Spring Steel vs. S44537 Stainless Steel

Both ASTM A229 spring steel and S44537 stainless steel are iron alloys. They have 74% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is ASTM A229 spring steel and the bottom bar is S44537 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 490 to 550
180
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 14
21
Fatigue Strength, MPa 710 to 790
230
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 72
79
Shear Strength, MPa 1020 to 1140
320
Tensile Strength: Ultimate (UTS), MPa 1690 to 1890
510
Tensile Strength: Yield (Proof), MPa 1100 to 1230
360

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Maximum Temperature: Mechanical, °C 400
1000
Melting Completion (Liquidus), °C 1450
1480
Melting Onset (Solidus), °C 1410
1430
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 50
21
Thermal Expansion, µm/m-K 12
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
2.6
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
3.0

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
19
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.4
3.4
Embodied Energy, MJ/kg 19
50
Embodied Water, L/kg 46
140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200 to 230
95
Resilience: Unit (Modulus of Resilience), kJ/m3 3260 to 4080
320
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 60 to 67
18
Strength to Weight: Bending, points 40 to 43
18
Thermal Diffusivity, mm2/s 14
5.6
Thermal Shock Resistance, points 54 to 60
17

Alloy Composition

Aluminum (Al), % 0
0 to 0.1
Carbon (C), % 0.55 to 0.85
0 to 0.030
Chromium (Cr), % 0
20 to 24
Copper (Cu), % 0
0 to 0.5
Iron (Fe), % 97.5 to 99
69 to 78.6
Lanthanum (La), % 0
0.040 to 0.2
Manganese (Mn), % 0.3 to 1.2
0 to 0.8
Nickel (Ni), % 0
0 to 0.5
Niobium (Nb), % 0
0.2 to 1.0
Nitrogen (N), % 0
0 to 0.040
Phosphorus (P), % 0 to 0.040
0 to 0.050
Silicon (Si), % 0.15 to 0.35
0.1 to 0.6
Sulfur (S), % 0 to 0.050
0 to 0.0060
Titanium (Ti), % 0
0.020 to 0.2
Tungsten (W), % 0
1.0 to 3.0