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ASTM A387 Grade 21 Steel vs. SAE-AISI 1012 Steel

Both ASTM A387 grade 21 steel and SAE-AISI 1012 steel are iron alloys. They have a very high 96% 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 A387 grade 21 steel and the bottom bar is SAE-AISI 1012 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150 to 180
100 to 110
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 21
21 to 31
Fatigue Strength, MPa 160 to 250
150 to 230
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
73
Shear Strength, MPa 310 to 370
230 to 250
Tensile Strength: Ultimate (UTS), MPa 500 to 590
360 to 400
Tensile Strength: Yield (Proof), MPa 230 to 350
200 to 330

Thermal Properties

Latent Heat of Fusion, J/g 260
250
Maximum Temperature: Mechanical, °C 480
400
Melting Completion (Liquidus), °C 1470
1470
Melting Onset (Solidus), °C 1430
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 41
53
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
6.9
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
7.9

Otherwise Unclassified Properties

Base Metal Price, % relative 4.1
1.8
Density, g/cm3 7.9
7.9
Embodied Carbon, kg CO2/kg material 1.8
1.4
Embodied Energy, MJ/kg 23
18
Embodied Water, L/kg 62
45

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 110
80 to 93
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 320
110 to 300
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 18 to 21
13 to 14
Strength to Weight: Bending, points 18 to 20
14 to 15
Thermal Diffusivity, mm2/s 11
14
Thermal Shock Resistance, points 14 to 17
11 to 13

Alloy Composition

Carbon (C), % 0.050 to 0.15
0.1 to 0.15
Chromium (Cr), % 2.8 to 3.3
0
Iron (Fe), % 94.4 to 96
99.16 to 99.6
Manganese (Mn), % 0.3 to 0.6
0.3 to 0.6
Molybdenum (Mo), % 0.9 to 1.1
0
Phosphorus (P), % 0 to 0.025
0 to 0.040
Silicon (Si), % 0 to 0.5
0
Sulfur (S), % 0 to 0.025
0 to 0.050