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ACI-ASTM CT15C Steel vs. ASTM Grade HH Steel

Both ACI-ASTM CT15C steel and ASTM grade HH steel are iron alloys. They have 79% of their average alloy composition in common.

For each property being compared, the top bar is ACI-ASTM CT15C steel and the bottom bar is ASTM grade HH steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
170
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 23
11
Fatigue Strength, MPa 130
150
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 76
79
Tensile Strength: Ultimate (UTS), MPa 500
580
Tensile Strength: Yield (Proof), MPa 190
270

Thermal Properties

Latent Heat of Fusion, J/g 310
310
Maximum Temperature: Corrosion, °C 560
440
Maximum Temperature: Mechanical, °C 1080
1100
Melting Completion (Liquidus), °C 1410
1400
Melting Onset (Solidus), °C 1360
1360
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 12
14
Thermal Expansion, µm/m-K 16
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.7
2.1
Electrical Conductivity: Equal Weight (Specific), % IACS 1.9
2.4

Otherwise Unclassified Properties

Base Metal Price, % relative 36
20
Density, g/cm3 8.0
7.7
Embodied Carbon, kg CO2/kg material 6.1
3.7
Embodied Energy, MJ/kg 88
53
Embodied Water, L/kg 190
180

Common Calculations

PREN (Pitting Resistance) 20
27
Resilience: Ultimate (Unit Rupture Work), MJ/m3 90
53
Resilience: Unit (Modulus of Resilience), kJ/m3 93
190
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 17
21
Strength to Weight: Bending, points 17
20
Thermal Diffusivity, mm2/s 3.2
3.8
Thermal Shock Resistance, points 12
12

Alloy Composition

Carbon (C), % 0.050 to 0.15
0.2 to 0.5
Chromium (Cr), % 19 to 21
24 to 28
Iron (Fe), % 40.3 to 49.2
52.9 to 64.8
Manganese (Mn), % 0.15 to 1.5
0 to 2.0
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 31 to 34
11 to 14
Niobium (Nb), % 0.5 to 1.5
0
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.15 to 1.5
0 to 2.0
Sulfur (S), % 0 to 0.030
0 to 0.040