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ACI-ASTM CK20 Steel vs. ASTM A369 Grade FP91

Both ACI-ASTM CK20 steel and ASTM A369 grade FP91 are iron alloys. They have 62% 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 ACI-ASTM CK20 steel and the bottom bar is ASTM A369 grade FP91.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
200
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 37
19
Fatigue Strength, MPa 220
320
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 78
75
Tensile Strength: Ultimate (UTS), MPa 530
670
Tensile Strength: Yield (Proof), MPa 260
460

Thermal Properties

Latent Heat of Fusion, J/g 310
270
Maximum Temperature: Mechanical, °C 1100
600
Melting Completion (Liquidus), °C 1400
1460
Melting Onset (Solidus), °C 1430
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 14
26
Thermal Expansion, µm/m-K 15
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
8.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
10

Otherwise Unclassified Properties

Base Metal Price, % relative 25
7.0
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 4.4
2.6
Embodied Energy, MJ/kg 62
37
Embodied Water, L/kg 190
88

Common Calculations

PREN (Pitting Resistance) 26
13
Resilience: Ultimate (Unit Rupture Work), MJ/m3 160
110
Resilience: Unit (Modulus of Resilience), kJ/m3 170
560
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 19
24
Strength to Weight: Bending, points 19
22
Thermal Diffusivity, mm2/s 3.7
6.9
Thermal Shock Resistance, points 13
18

Alloy Composition

Aluminum (Al), % 0
0 to 0.020
Carbon (C), % 0 to 0.2
0.080 to 0.12
Chromium (Cr), % 23 to 27
8.0 to 9.5
Iron (Fe), % 46.7 to 58
87.3 to 90.3
Manganese (Mn), % 0 to 2.0
0.3 to 0.6
Molybdenum (Mo), % 0 to 0.5
0.85 to 1.1
Nickel (Ni), % 19 to 22
0 to 0.4
Niobium (Nb), % 0
0.060 to 0.1
Nitrogen (N), % 0
0.030 to 0.070
Phosphorus (P), % 0 to 0.040
0 to 0.025
Silicon (Si), % 0 to 2.0
0.2 to 0.5
Sulfur (S), % 0 to 0.040
0 to 0.025
Titanium (Ti), % 0
0 to 0.010
Vanadium (V), % 0
0.18 to 0.25
Zirconium (Zr), % 0
0 to 0.010