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ASTM A387 Grade 21 Steel vs. ASTM A387 Grade 2 Steel

Both ASTM A387 grade 21 steel and ASTM A387 grade 2 steel are iron alloys. They have a very high 97% of their average alloy composition in common.

For each property being compared, the top bar is ASTM A387 grade 21 steel and the bottom bar is ASTM A387 grade 2 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150 to 180
140 to 170
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 21
25
Fatigue Strength, MPa 160 to 250
190 to 250
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
73
Shear Strength, MPa 310 to 370
300 to 350
Tensile Strength: Ultimate (UTS), MPa 500 to 590
470 to 550
Tensile Strength: Yield (Proof), MPa 230 to 350
260 to 350

Thermal Properties

Latent Heat of Fusion, J/g 260
250
Maximum Temperature: Mechanical, °C 480
420
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
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 4.1
2.6
Density, g/cm3 7.9
7.9
Embodied Carbon, kg CO2/kg material 1.8
1.6
Embodied Energy, MJ/kg 23
20
Embodied Water, L/kg 62
50

Common Calculations

PREN (Pitting Resistance) 6.4
2.4
Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 110
98 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 320
180 to 320
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 18 to 21
16 to 20
Strength to Weight: Bending, points 18 to 20
17 to 19
Thermal Diffusivity, mm2/s 11
12
Thermal Shock Resistance, points 14 to 17
14 to 16

Alloy Composition

Carbon (C), % 0.050 to 0.15
0.050 to 0.21
Chromium (Cr), % 2.8 to 3.3
0.5 to 0.8
Iron (Fe), % 94.4 to 96
97.1 to 98.3
Manganese (Mn), % 0.3 to 0.6
0.55 to 0.8
Molybdenum (Mo), % 0.9 to 1.1
0.45 to 0.6
Phosphorus (P), % 0 to 0.025
0 to 0.025
Silicon (Si), % 0 to 0.5
0.15 to 0.4
Sulfur (S), % 0 to 0.025
0 to 0.025

Comparable Variants