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

Both ASTM A387 grade 2 steel and ASTM A387 grade 21 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 2 steel and the bottom bar is ASTM A387 grade 21 steel.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

Latent Heat of Fusion, J/g 250
260
Maximum Temperature: Mechanical, °C 420
480
Melting Completion (Liquidus), °C 1470
1470
Melting Onset (Solidus), °C 1420
1430
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 45
41
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
8.8

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

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

Comparable Variants