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ACI-ASTM CG8M Steel vs. ASTM Grade HK Steel

Both ACI-ASTM CG8M steel and ASTM grade HK steel are iron alloys. They have 84% 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 ACI-ASTM CG8M steel and the bottom bar is ASTM grade HK steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
150
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 45
11
Fatigue Strength, MPa 280
150
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 79
79
Tensile Strength: Ultimate (UTS), MPa 550
500
Tensile Strength: Yield (Proof), MPa 300
270

Thermal Properties

Latent Heat of Fusion, J/g 300
310
Maximum Temperature: Corrosion, °C 420
440
Maximum Temperature: Mechanical, °C 1020
1100
Melting Completion (Liquidus), °C 1450
1400
Melting Onset (Solidus), °C 1400
1350
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 16
15
Thermal Expansion, µm/m-K 16
17

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 20
25
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 4.1
4.4
Embodied Energy, MJ/kg 56
63
Embodied Water, L/kg 160
200

Common Calculations

PREN (Pitting Resistance) 31
27
Resilience: Ultimate (Unit Rupture Work), MJ/m3 210
48
Resilience: Unit (Modulus of Resilience), kJ/m3 220
190
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 19
18
Strength to Weight: Bending, points 19
18
Thermal Diffusivity, mm2/s 4.3
3.9
Thermal Shock Resistance, points 12
11

Alloy Composition

Carbon (C), % 0 to 0.080
0.2 to 0.6
Chromium (Cr), % 18 to 21
24 to 28
Iron (Fe), % 58.8 to 70
44.8 to 57.8
Manganese (Mn), % 0 to 1.5
0 to 2.0
Molybdenum (Mo), % 3.0 to 4.0
0 to 0.5
Nickel (Ni), % 9.0 to 13
18 to 22
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.5
0 to 2.0
Sulfur (S), % 0 to 0.040
0 to 0.040