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EN 1.4931 Steel vs. ASTM A387 Grade 9 Steel

Both EN 1.4931 steel and ASTM A387 grade 9 steel are iron alloys. They have a very high 96% 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 1.4931 steel and the bottom bar is ASTM A387 grade 9 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 240
150 to 180
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 17
20 to 21
Fatigue Strength, MPa 410
160 to 240
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
75
Tensile Strength: Ultimate (UTS), MPa 810
500 to 600
Tensile Strength: Yield (Proof), MPa 620
230 to 350

Thermal Properties

Latent Heat of Fusion, J/g 270
270
Maximum Temperature: Mechanical, °C 600
600
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 24
26
Thermal Expansion, µm/m-K 14
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 9.8
9.0
Electrical Conductivity: Equal Weight (Specific), % IACS 11
10

Otherwise Unclassified Properties

Base Metal Price, % relative 8.5
6.5
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.9
2.1
Embodied Energy, MJ/kg 42
28
Embodied Water, L/kg 100
87

Common Calculations

PREN (Pitting Resistance) 16
12
Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
83 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 970
140 to 310
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 29
18 to 21
Strength to Weight: Bending, points 25
18 to 20
Thermal Diffusivity, mm2/s 6.5
6.9
Thermal Shock Resistance, points 22
14 to 17

Alloy Composition

Carbon (C), % 0.2 to 0.26
0 to 0.15
Chromium (Cr), % 11.3 to 12.2
8.0 to 10
Iron (Fe), % 83.2 to 86.8
87.1 to 90.8
Manganese (Mn), % 0.5 to 0.8
0.3 to 0.6
Molybdenum (Mo), % 1.0 to 1.2
0.9 to 1.1
Nickel (Ni), % 0 to 1.0
0
Phosphorus (P), % 0 to 0.030
0 to 0.025
Silicon (Si), % 0 to 0.4
0 to 1.0
Sulfur (S), % 0 to 0.020
0 to 0.025
Tungsten (W), % 0 to 0.5
0
Vanadium (V), % 0.25 to 0.35
0 to 0.040