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ACI-ASTM CF20 Steel vs. ASTM A229 Spring Steel

Both ACI-ASTM CF20 steel and ASTM A229 spring steel are iron alloys. They have 70% of their average alloy composition in common. There are 30 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 ACI-ASTM CF20 steel and the bottom bar is ASTM A229 spring steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
490 to 550
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 50
14
Fatigue Strength, MPa 240
710 to 790
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
72
Tensile Strength: Ultimate (UTS), MPa 530
1690 to 1890
Tensile Strength: Yield (Proof), MPa 250
1100 to 1230

Thermal Properties

Latent Heat of Fusion, J/g 300
250
Maximum Temperature: Mechanical, °C 970
400
Melting Completion (Liquidus), °C 1420
1450
Melting Onset (Solidus), °C 1410
1410
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 16
50
Thermal Expansion, µm/m-K 17
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 16
1.8
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.1
1.4
Embodied Energy, MJ/kg 44
19
Embodied Water, L/kg 150
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 220
200 to 230
Resilience: Unit (Modulus of Resilience), kJ/m3 160
3260 to 4080
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 19
60 to 67
Strength to Weight: Bending, points 19
40 to 43
Thermal Diffusivity, mm2/s 4.3
14
Thermal Shock Resistance, points 11
54 to 60

Alloy Composition

Carbon (C), % 0 to 0.2
0.55 to 0.85
Chromium (Cr), % 18 to 21
0
Iron (Fe), % 64.2 to 74
97.5 to 99
Manganese (Mn), % 0 to 1.5
0.3 to 1.2
Nickel (Ni), % 8.0 to 11
0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 2.0
0.15 to 0.35
Sulfur (S), % 0 to 0.040
0 to 0.050