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SAE-AISI 1144 Steel vs. ASTM A231 Spring Steel

Both SAE-AISI 1144 steel and ASTM A231 spring steel are iron alloys. They have a very high 98% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 1144 steel and the bottom bar is ASTM A231 spring steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220 to 230
540
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11 to 17
14
Fatigue Strength, MPa 280 to 430
1000
Poisson's Ratio 0.29
0.29
Reduction in Area, % 34 to 40
46
Shear Modulus, GPa 72
73
Shear Strength, MPa 460 to 510
1080
Tensile Strength: Ultimate (UTS), MPa 750 to 840
1790
Tensile Strength: Yield (Proof), MPa 420 to 690
1570

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 400
420
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1410
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 51
52
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.2
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
2.3
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.4
2.0
Embodied Energy, MJ/kg 19
28
Embodied Water, L/kg 47
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 91 to 110
230
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 27 to 30
64
Strength to Weight: Bending, points 23 to 25
42
Thermal Diffusivity, mm2/s 14
14
Thermal Shock Resistance, points 22 to 24
53

Alloy Composition

Carbon (C), % 0.4 to 0.48
0.48 to 0.53
Chromium (Cr), % 0
0.8 to 1.1
Iron (Fe), % 97.5 to 98
96.7 to 97.7
Manganese (Mn), % 1.4 to 1.7
0.7 to 0.9
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0
0.15 to 0.35
Sulfur (S), % 0.24 to 0.33
0 to 0.040
Vanadium (V), % 0
0.15 to 0.3