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ASTM A372 Grade K Steel vs. SAE-AISI 1020 Steel

Both ASTM A372 grade K steel and SAE-AISI 1020 steel are iron alloys. They have a very high 95% of their average alloy composition in common. There are 31 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 ASTM A372 grade K steel and the bottom bar is SAE-AISI 1020 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 230
120 to 130
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 23
17 to 28
Fatigue Strength, MPa 440
180 to 250
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 490
280
Tensile Strength: Ultimate (UTS), MPa 780
430 to 460
Tensile Strength: Yield (Proof), MPa 620
240 to 380

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 440
400
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 48
52
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
11
Electrical Conductivity: Equal Weight (Specific), % IACS 8.9
12

Otherwise Unclassified Properties

Base Metal Price, % relative 4.4
1.8
Density, g/cm3 7.9
7.9
Embodied Carbon, kg CO2/kg material 1.8
1.4
Embodied Energy, MJ/kg 24
18
Embodied Water, L/kg 57
45

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 160
72 to 100
Resilience: Unit (Modulus of Resilience), kJ/m3 1010
150 to 380
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 27
15 to 16
Strength to Weight: Bending, points 24
16 to 17
Thermal Diffusivity, mm2/s 13
14
Thermal Shock Resistance, points 23
13 to 14

Alloy Composition

Carbon (C), % 0 to 0.18
0.18 to 0.23
Chromium (Cr), % 1.0 to 1.8
0
Iron (Fe), % 93.4 to 96.6
99.08 to 99.52
Manganese (Mn), % 0.1 to 0.4
0.3 to 0.6
Molybdenum (Mo), % 0.2 to 0.6
0
Nickel (Ni), % 2.0 to 3.3
0
Phosphorus (P), % 0 to 0.015
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0
Sulfur (S), % 0 to 0.010
0 to 0.050