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SAE-AISI 1045 Steel vs. ASTM A227 Spring Steel

Both SAE-AISI 1045 steel and ASTM A227 spring steel are iron alloys. Their average alloy composition is basically identical. There are 30 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 1045 steel and the bottom bar is ASTM A227 spring steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180 to 190
500 to 640
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 13 to 18
12
Fatigue Strength, MPa 220 to 370
900 to 1160
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
72
Shear Strength, MPa 380 to 410
1030 to 1330
Tensile Strength: Ultimate (UTS), MPa 620 to 680
1720 to 2220
Tensile Strength: Yield (Proof), MPa 330 to 580
1430 to 1850

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 400
400
Melting Completion (Liquidus), °C 1460
1450
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 51
52
Thermal Expansion, µm/m-K 12
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.0
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.1
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
1.8
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.4
1.4
Embodied Energy, MJ/kg 18
19
Embodied Water, L/kg 46
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 93
200 to 260
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 22 to 24
61 to 79
Strength to Weight: Bending, points 21 to 22
41 to 48
Thermal Diffusivity, mm2/s 14
14
Thermal Shock Resistance, points 20 to 22
55 to 71

Alloy Composition

Carbon (C), % 0.43 to 0.5
0.45 to 0.85
Iron (Fe), % 98.5 to 99
97.4 to 99.1
Manganese (Mn), % 0.6 to 0.9
0.3 to 1.3
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0
0.15 to 0.35
Sulfur (S), % 0 to 0.050
0 to 0.050