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ASTM A387 Grade 21 Steel vs. ASTM A182 Grade F12 Class 1

Both ASTM A387 grade 21 steel and ASTM A182 grade F12 class 1 are iron alloys. They have a very high 98% of their average alloy composition in common. There are 32 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 A387 grade 21 steel and the bottom bar is ASTM A182 grade F12 class 1.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150 to 180
150
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 21
23
Fatigue Strength, MPa 160 to 250
180
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
73
Shear Strength, MPa 310 to 370
300
Tensile Strength: Ultimate (UTS), MPa 500 to 590
470
Tensile Strength: Yield (Proof), MPa 230 to 350
250

Thermal Properties

Latent Heat of Fusion, J/g 260
250
Maximum Temperature: Mechanical, °C 480
430
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
45
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 4.1
2.8
Density, g/cm3 7.9
7.9
Embodied Carbon, kg CO2/kg material 1.8
1.6
Embodied Energy, MJ/kg 23
21
Embodied Water, L/kg 62
52

Common Calculations

PREN (Pitting Resistance) 6.4
2.8
Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 110
91
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 320
160
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 18 to 21
17
Strength to Weight: Bending, points 18 to 20
17
Thermal Diffusivity, mm2/s 11
12
Thermal Shock Resistance, points 14 to 17
14

Alloy Composition

Carbon (C), % 0.050 to 0.15
0.050 to 0.15
Chromium (Cr), % 2.8 to 3.3
0.8 to 1.3
Iron (Fe), % 94.4 to 96
96.8 to 98.4
Manganese (Mn), % 0.3 to 0.6
0.3 to 0.6
Molybdenum (Mo), % 0.9 to 1.1
0.44 to 0.65
Phosphorus (P), % 0 to 0.025
0 to 0.045
Silicon (Si), % 0 to 0.5
0 to 0.5
Sulfur (S), % 0 to 0.025
0 to 0.045