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ACI-ASTM CA40F Steel vs. ASTM Grade HK Steel

Both ACI-ASTM CA40F steel and ASTM grade HK steel are iron alloys. They have 66% of their average alloy composition in common.

For each property being compared, the top bar is ACI-ASTM CA40F steel and the bottom bar is ASTM grade HK steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 230
150
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 13
11
Fatigue Strength, MPa 320
150
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 76
79
Tensile Strength: Ultimate (UTS), MPa 770
500
Tensile Strength: Yield (Proof), MPa 550
270

Thermal Properties

Latent Heat of Fusion, J/g 280
310
Maximum Temperature: Corrosion, °C 390
440
Maximum Temperature: Mechanical, °C 750
1100
Melting Completion (Liquidus), °C 1430
1400
Melting Onset (Solidus), °C 1390
1350
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 27
15
Thermal Expansion, µm/m-K 10
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.0
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 3.5
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 7.5
25
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 2.0
4.4
Embodied Energy, MJ/kg 28
63
Embodied Water, L/kg 100
200

Common Calculations

PREN (Pitting Resistance) 14
27
Resilience: Ultimate (Unit Rupture Work), MJ/m3 94
48
Resilience: Unit (Modulus of Resilience), kJ/m3 790
190
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 28
18
Strength to Weight: Bending, points 24
18
Thermal Diffusivity, mm2/s 7.2
3.9
Thermal Shock Resistance, points 28
11

Alloy Composition

Carbon (C), % 0.2 to 0.4
0.2 to 0.6
Chromium (Cr), % 11.5 to 14
24 to 28
Iron (Fe), % 81.6 to 88.3
44.8 to 57.8
Manganese (Mn), % 0 to 1.0
0 to 2.0
Molybdenum (Mo), % 0 to 0.5
0 to 0.5
Nickel (Ni), % 0 to 1.0
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), % 0.2 to 0.4
0 to 0.040