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ASTM Grade HC Steel vs. ASTM A387 Grade 21 Steel

Both ASTM grade HC steel and ASTM A387 grade 21 steel are iron alloys. They have 72% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 6.0
21
Fatigue Strength, MPa 96
160 to 250
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 80
74
Tensile Strength: Ultimate (UTS), MPa 430
500 to 590
Tensile Strength: Yield (Proof), MPa 200
230 to 350

Thermal Properties

Latent Heat of Fusion, J/g 310
260
Maximum Temperature: Mechanical, °C 1100
480
Melting Completion (Liquidus), °C 1410
1470
Melting Onset (Solidus), °C 1370
1430
Specific Heat Capacity, J/kg-K 490
470
Thermal Conductivity, W/m-K 17
41
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 2.6
8.8

Otherwise Unclassified Properties

Base Metal Price, % relative 14
4.1
Density, g/cm3 7.6
7.9
Embodied Carbon, kg CO2/kg material 2.8
1.8
Embodied Energy, MJ/kg 40
23
Embodied Water, L/kg 170
62

Common Calculations

PREN (Pitting Resistance) 29
6.4
Resilience: Ultimate (Unit Rupture Work), MJ/m3 21
84 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 95
140 to 320
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 26
24
Strength to Weight: Axial, points 16
18 to 21
Strength to Weight: Bending, points 16
18 to 20
Thermal Diffusivity, mm2/s 4.5
11
Thermal Shock Resistance, points 14
14 to 17

Alloy Composition

Carbon (C), % 0 to 0.5
0.050 to 0.15
Chromium (Cr), % 26 to 30
2.8 to 3.3
Iron (Fe), % 61.9 to 74
94.4 to 96
Manganese (Mn), % 0 to 1.0
0.3 to 0.6
Molybdenum (Mo), % 0 to 0.5
0.9 to 1.1
Nickel (Ni), % 0 to 4.0
0
Phosphorus (P), % 0 to 0.040
0 to 0.025
Silicon (Si), % 0 to 2.0
0 to 0.5
Sulfur (S), % 0 to 0.040
0 to 0.025