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ASTM A229 Spring Steel vs. SAE-AISI 1151 Steel

Both ASTM A229 spring steel and SAE-AISI 1151 steel are iron alloys. Their average alloy composition is basically identical. 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 ASTM A229 spring steel and the bottom bar is SAE-AISI 1151 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 490 to 550
210 to 220
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 14
11 to 17
Fatigue Strength, MPa 710 to 790
260 to 410
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
72
Shear Strength, MPa 1020 to 1140
430 to 480
Tensile Strength: Ultimate (UTS), MPa 1690 to 1890
710 to 800
Tensile Strength: Yield (Proof), MPa 1100 to 1230
390 to 660

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 400
400
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 50
51
Thermal Expansion, µm/m-K 12
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
10
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
12

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 19
18
Embodied Water, L/kg 46
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200 to 230
86 to 100
Resilience: Unit (Modulus of Resilience), kJ/m3 3260 to 4080
400 to 1170
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 60 to 67
25 to 28
Strength to Weight: Bending, points 40 to 43
22 to 24
Thermal Diffusivity, mm2/s 14
14
Thermal Shock Resistance, points 54 to 60
22 to 25

Alloy Composition

Carbon (C), % 0.55 to 0.85
0.48 to 0.55
Iron (Fe), % 97.5 to 99
98.3 to 98.7
Manganese (Mn), % 0.3 to 1.2
0.7 to 1.0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0
Sulfur (S), % 0 to 0.050
0.080 to 0.13

Comparable Variants