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ACI-ASTM CN7M Steel vs. ASTM A369 Grade FP21

Both ACI-ASTM CN7M steel and ASTM A369 grade FP21 are iron alloys. They have 48% 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 CN7M steel and the bottom bar is ASTM A369 grade FP21.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
140
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 44
20
Fatigue Strength, MPa 190
160
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
74
Tensile Strength: Ultimate (UTS), MPa 480
470
Tensile Strength: Yield (Proof), MPa 200
240

Thermal Properties

Latent Heat of Fusion, J/g 310
260
Maximum Temperature: Mechanical, °C 1100
470
Melting Completion (Liquidus), °C 1410
1470
Melting Onset (Solidus), °C 1450
1430
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 21
41
Thermal Expansion, µm/m-K 15
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.6
7.7
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
8.8

Otherwise Unclassified Properties

Base Metal Price, % relative 32
4.0
Density, g/cm3 8.1
7.8
Embodied Carbon, kg CO2/kg material 5.6
1.8
Embodied Energy, MJ/kg 78
23
Embodied Water, L/kg 210
61

Common Calculations

PREN (Pitting Resistance) 29
6.2
Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
80
Resilience: Unit (Modulus of Resilience), kJ/m3 110
150
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 17
17
Strength to Weight: Bending, points 17
17
Thermal Diffusivity, mm2/s 5.6
11
Thermal Shock Resistance, points 12
14

Alloy Composition

Carbon (C), % 0 to 0.070
0.050 to 0.15
Chromium (Cr), % 19 to 22
2.7 to 3.4
Copper (Cu), % 3.0 to 4.0
0
Iron (Fe), % 37.4 to 48.5
94.3 to 96.2
Manganese (Mn), % 0 to 1.5
0.3 to 0.6
Molybdenum (Mo), % 2.0 to 3.0
0.8 to 1.1
Nickel (Ni), % 27.5 to 30.5
0
Phosphorus (P), % 0 to 0.040
0 to 0.025
Silicon (Si), % 0 to 1.5
0 to 0.5
Sulfur (S), % 0 to 0.040
0 to 0.025