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EN 1.7725 Steel vs. ASTM A369 Grade FP9

Both EN 1.7725 steel and ASTM A369 grade FP9 are iron alloys. They have a moderately high 91% 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 EN 1.7725 steel and the bottom bar is ASTM A369 grade FP9.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 250 to 300
140
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 14
20
Fatigue Strength, MPa 390 to 550
160
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
75
Tensile Strength: Ultimate (UTS), MPa 830 to 1000
470
Tensile Strength: Yield (Proof), MPa 610 to 860
240

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Maximum Temperature: Mechanical, °C 440
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 39
26
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
9.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
10

Otherwise Unclassified Properties

Base Metal Price, % relative 2.9
6.5
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.8
2.0
Embodied Energy, MJ/kg 24
28
Embodied Water, L/kg 54
87

Common Calculations

PREN (Pitting Resistance) 2.8
12
Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 130
80
Resilience: Unit (Modulus of Resilience), kJ/m3 980 to 1940
140
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 29 to 35
17
Strength to Weight: Bending, points 25 to 28
17
Thermal Diffusivity, mm2/s 11
6.9
Thermal Shock Resistance, points 24 to 29
13

Alloy Composition

Carbon (C), % 0.27 to 0.34
0 to 0.15
Chromium (Cr), % 1.3 to 1.7
8.0 to 10
Iron (Fe), % 95.7 to 97.5
87.1 to 90.3
Manganese (Mn), % 0.6 to 1.0
0.3 to 0.6
Molybdenum (Mo), % 0.3 to 0.5
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
Vanadium (V), % 0.050 to 0.15
0