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EN 1.7321 Steel vs. ASTM A387 Grade 9 Steel

Both EN 1.7321 steel and ASTM A387 grade 9 steel are iron alloys. They have a moderately high 91% of their average alloy composition in common. There are 25 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is EN 1.7321 steel and the bottom bar is ASTM A387 grade 9 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150 to 170
150 to 180
Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
75
Tensile Strength: Ultimate (UTS), MPa 490 to 1460
500 to 600

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Maximum Temperature: Mechanical, °C 410
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 45
26
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
9.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
10

Otherwise Unclassified Properties

Base Metal Price, % relative 2.5
6.5
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.5
2.1
Embodied Energy, MJ/kg 20
28
Embodied Water, L/kg 50
87

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 17 to 52
18 to 21
Strength to Weight: Bending, points 18 to 36
18 to 20
Thermal Diffusivity, mm2/s 12
6.9
Thermal Shock Resistance, points 14 to 43
14 to 17

Alloy Composition

Carbon (C), % 0.17 to 0.23
0 to 0.15
Chromium (Cr), % 0.3 to 0.6
8.0 to 10
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 97.1 to 98.4
87.1 to 90.8
Manganese (Mn), % 0.7 to 1.0
0.3 to 0.6
Molybdenum (Mo), % 0.4 to 0.5
0.9 to 1.1
Phosphorus (P), % 0 to 0.025
0 to 0.025
Silicon (Si), % 0 to 0.3
0 to 1.0
Sulfur (S), % 0 to 0.025
0 to 0.025
Vanadium (V), % 0
0 to 0.040