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EN 1.7221 Steel vs. ASTM A369 Grade FP9

Both EN 1.7221 steel and ASTM A369 grade FP9 are iron alloys. They have a moderately high 91% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is EN 1.7221 steel and the bottom bar is ASTM A369 grade FP9.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200 to 230
140
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11 to 17
20
Fatigue Strength, MPa 290 to 390
160
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
75
Tensile Strength: Ultimate (UTS), MPa 650 to 780
470
Tensile Strength: Yield (Proof), MPa 430 to 630
240

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Maximum Temperature: Mechanical, °C 420
600
Melting Completion (Liquidus), °C 1460
1450
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 44
26
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
9.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
10

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
6.5
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.5
2.0
Embodied Energy, MJ/kg 20
28
Embodied Water, L/kg 51
87

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 83 to 98
80
Resilience: Unit (Modulus of Resilience), kJ/m3 490 to 1050
140
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 23 to 27
17
Strength to Weight: Bending, points 21 to 24
17
Thermal Diffusivity, mm2/s 12
6.9
Thermal Shock Resistance, points 19 to 23
13

Alloy Composition

Carbon (C), % 0.22 to 0.29
0 to 0.15
Chromium (Cr), % 0.8 to 1.2
8.0 to 10
Iron (Fe), % 96.8 to 98.3
87.1 to 90.3
Manganese (Mn), % 0.5 to 0.8
0.3 to 0.6
Molybdenum (Mo), % 0.15 to 0.3
0.9 to 1.1
Phosphorus (P), % 0 to 0.025
0 to 0.030
Silicon (Si), % 0 to 0.6
0.5 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030