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ASTM Grade HT Steel vs. ACI-ASTM CA40F Steel

Both ASTM grade HT steel and ACI-ASTM CA40F steel are iron alloys. They have 60% of their average alloy composition in common.

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

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
230
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 4.6
13
Fatigue Strength, MPa 130
320
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
76
Tensile Strength: Ultimate (UTS), MPa 500
770
Tensile Strength: Yield (Proof), MPa 270
550

Thermal Properties

Latent Heat of Fusion, J/g 310
280
Maximum Temperature: Corrosion, °C 400
390
Maximum Temperature: Mechanical, °C 1010
750
Melting Completion (Liquidus), °C 1390
1430
Melting Onset (Solidus), °C 1340
1390
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 12
27
Thermal Expansion, µm/m-K 15
10

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

PREN (Pitting Resistance) 18
14
Resilience: Ultimate (Unit Rupture Work), MJ/m3 19
94
Resilience: Unit (Modulus of Resilience), kJ/m3 180
790
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 18
28
Strength to Weight: Bending, points 18
24
Thermal Diffusivity, mm2/s 3.2
7.2
Thermal Shock Resistance, points 12
28

Alloy Composition

Carbon (C), % 0.35 to 0.75
0.2 to 0.4
Chromium (Cr), % 15 to 19
11.5 to 14
Iron (Fe), % 38.2 to 51.7
81.6 to 88.3
Manganese (Mn), % 0 to 2.0
0 to 1.0
Molybdenum (Mo), % 0 to 0.5
0 to 0.5
Nickel (Ni), % 33 to 37
0 to 1.0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 2.5
0 to 1.5
Sulfur (S), % 0 to 0.040
0.2 to 0.4