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ASTM Grade HK Steel vs. ASTM A387 Grade 21 Steel

Both ASTM grade HK steel and ASTM A387 grade 21 steel are iron alloys. They have 55% 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 grade HK steel and the bottom bar is ASTM A387 grade 21 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
150 to 180
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 11
21
Fatigue Strength, MPa 150
160 to 250
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 79
74
Tensile Strength: Ultimate (UTS), MPa 500
500 to 590
Tensile Strength: Yield (Proof), MPa 270
230 to 350

Thermal Properties

Latent Heat of Fusion, J/g 310
260
Maximum Temperature: Mechanical, °C 1100
480
Melting Completion (Liquidus), °C 1400
1470
Melting Onset (Solidus), °C 1350
1430
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 15
41
Thermal Expansion, µm/m-K 17
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
8.8

Otherwise Unclassified Properties

Base Metal Price, % relative 25
4.1
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 4.4
1.8
Embodied Energy, MJ/kg 63
23
Embodied Water, L/kg 200
62

Common Calculations

PREN (Pitting Resistance) 27
6.4
Resilience: Ultimate (Unit Rupture Work), MJ/m3 48
84 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 190
140 to 320
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 18
18 to 21
Strength to Weight: Bending, points 18
18 to 20
Thermal Diffusivity, mm2/s 3.9
11
Thermal Shock Resistance, points 11
14 to 17

Alloy Composition

Carbon (C), % 0.2 to 0.6
0.050 to 0.15
Chromium (Cr), % 24 to 28
2.8 to 3.3
Iron (Fe), % 44.8 to 57.8
94.4 to 96
Manganese (Mn), % 0 to 2.0
0.3 to 0.6
Molybdenum (Mo), % 0 to 0.5
0.9 to 1.1
Nickel (Ni), % 18 to 22
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