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ASTM A372 Grade K Steel vs. ACI-ASTM CT15C Steel

Both ASTM A372 grade K steel and ACI-ASTM CT15C steel are iron alloys. They have 49% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is ASTM A372 grade K steel and the bottom bar is ACI-ASTM CT15C steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 230
140
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 23
23
Fatigue Strength, MPa 440
130
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
76
Tensile Strength: Ultimate (UTS), MPa 780
500
Tensile Strength: Yield (Proof), MPa 620
190

Thermal Properties

Latent Heat of Fusion, J/g 250
310
Maximum Temperature: Mechanical, °C 440
1080
Melting Completion (Liquidus), °C 1460
1410
Melting Onset (Solidus), °C 1420
1360
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 48
12
Thermal Expansion, µm/m-K 13
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 8.9
1.9

Otherwise Unclassified Properties

Base Metal Price, % relative 4.4
36
Density, g/cm3 7.9
8.0
Embodied Carbon, kg CO2/kg material 1.8
6.1
Embodied Energy, MJ/kg 24
88
Embodied Water, L/kg 57
190

Common Calculations

PREN (Pitting Resistance) 2.7
20
Resilience: Ultimate (Unit Rupture Work), MJ/m3 160
90
Resilience: Unit (Modulus of Resilience), kJ/m3 1010
93
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 27
17
Strength to Weight: Bending, points 24
17
Thermal Diffusivity, mm2/s 13
3.2
Thermal Shock Resistance, points 23
12

Alloy Composition

Carbon (C), % 0 to 0.18
0.050 to 0.15
Chromium (Cr), % 1.0 to 1.8
19 to 21
Iron (Fe), % 93.4 to 96.6
40.3 to 49.2
Manganese (Mn), % 0.1 to 0.4
0.15 to 1.5
Molybdenum (Mo), % 0.2 to 0.6
0
Nickel (Ni), % 2.0 to 3.3
31 to 34
Niobium (Nb), % 0
0.5 to 1.5
Phosphorus (P), % 0 to 0.015
0 to 0.030
Silicon (Si), % 0.15 to 0.35
0.15 to 1.5
Sulfur (S), % 0 to 0.010
0 to 0.030