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ACI-ASTM CA40 Steel vs. ASTM Grade HT Steel

Both ACI-ASTM CA40 steel and ASTM grade HT steel are iron alloys. They have 60% of their average alloy composition in common.

For each property being compared, the top bar is ACI-ASTM CA40 steel and the bottom bar is ASTM grade HT steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 310
150
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 10
4.6
Fatigue Strength, MPa 460
130
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
76
Tensile Strength: Ultimate (UTS), MPa 910
500
Tensile Strength: Yield (Proof), MPa 860
270

Thermal Properties

Latent Heat of Fusion, J/g 280
310
Maximum Temperature: Corrosion, °C 390
400
Maximum Temperature: Mechanical, °C 750
1010
Melting Completion (Liquidus), °C 1440
1390
Melting Onset (Solidus), °C 1500
1340
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 25
12
Thermal Expansion, µm/m-K 10
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.0
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 3.5
1.9

Otherwise Unclassified Properties

Base Metal Price, % relative 7.5
31
Density, g/cm3 7.7
8.0
Embodied Carbon, kg CO2/kg material 2.0
5.4
Embodied Energy, MJ/kg 28
76
Embodied Water, L/kg 100
190

Common Calculations

PREN (Pitting Resistance) 14
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 89
19
Resilience: Unit (Modulus of Resilience), kJ/m3 1910
180
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 33
18
Strength to Weight: Bending, points 27
18
Thermal Diffusivity, mm2/s 6.7
3.2
Thermal Shock Resistance, points 33
12

Alloy Composition

Carbon (C), % 0.2 to 0.4
0.35 to 0.75
Chromium (Cr), % 11.5 to 14
15 to 19
Iron (Fe), % 81.5 to 88.3
38.2 to 51.7
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
33 to 37
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.5
0 to 2.5
Sulfur (S), % 0 to 0.040
0 to 0.040