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S44700 Stainless Steel vs. ASTM A231 Spring Steel

Both S44700 stainless steel and ASTM A231 spring steel are iron alloys. They have 68% 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 S44700 stainless steel and the bottom bar is ASTM A231 spring steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200
540
Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 23
14
Fatigue Strength, MPa 300
1000
Poisson's Ratio 0.27
0.29
Reduction in Area, % 45
46
Shear Modulus, GPa 82
73
Shear Strength, MPa 380
1080
Tensile Strength: Ultimate (UTS), MPa 600
1790
Tensile Strength: Yield (Proof), MPa 450
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 480
470
Thermal Expansion, µm/m-K 11
13

Otherwise Unclassified Properties

Base Metal Price, % relative 18
2.3
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.6
2.0
Embodied Energy, MJ/kg 49
28
Embodied Water, L/kg 180
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
230
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 21
64
Strength to Weight: Bending, points 20
42
Thermal Shock Resistance, points 19
53

Alloy Composition

Carbon (C), % 0 to 0.010
0.48 to 0.53
Chromium (Cr), % 28 to 30
0.8 to 1.1
Copper (Cu), % 0 to 0.15
0
Iron (Fe), % 64.9 to 68.5
96.7 to 97.7
Manganese (Mn), % 0 to 0.3
0.7 to 0.9
Molybdenum (Mo), % 3.5 to 4.2
0
Nickel (Ni), % 0 to 0.15
0
Nitrogen (N), % 0 to 0.020
0
Phosphorus (P), % 0 to 0.025
0 to 0.040
Silicon (Si), % 0 to 0.2
0.15 to 0.35
Sulfur (S), % 0 to 0.020
0 to 0.040
Vanadium (V), % 0
0.15 to 0.3