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ASTM A387 Grade 9 Steel vs. EN 1.7720 Steel

Both ASTM A387 grade 9 steel and EN 1.7720 steel 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 ASTM A387 grade 9 steel and the bottom bar is EN 1.7720 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150 to 180
180
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 20 to 21
19
Fatigue Strength, MPa 160 to 240
230
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
73
Tensile Strength: Ultimate (UTS), MPa 500 to 600
590
Tensile Strength: Yield (Proof), MPa 230 to 350
340

Thermal Properties

Latent Heat of Fusion, J/g 270
250
Maximum Temperature: Mechanical, °C 600
410
Melting Completion (Liquidus), °C 1460
1470
Melting Onset (Solidus), °C 1410
1430
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 26
40
Thermal Expansion, µm/m-K 13
13

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 6.5
2.8
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 2.1
2.2
Embodied Energy, MJ/kg 28
30
Embodied Water, L/kg 87
51

Common Calculations

PREN (Pitting Resistance) 12
2.1
Resilience: Ultimate (Unit Rupture Work), MJ/m3 83 to 110
97
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 310
300
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 18 to 21
21
Strength to Weight: Bending, points 18 to 20
20
Thermal Diffusivity, mm2/s 6.9
11
Thermal Shock Resistance, points 14 to 17
17

Alloy Composition

Carbon (C), % 0 to 0.15
0.1 to 0.15
Chromium (Cr), % 8.0 to 10
0.3 to 0.5
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 87.1 to 90.8
96.6 to 98.6
Manganese (Mn), % 0.3 to 0.6
0.4 to 0.7
Molybdenum (Mo), % 0.9 to 1.1
0.4 to 0.6
Nickel (Ni), % 0
0 to 0.4
Phosphorus (P), % 0 to 0.025
0 to 0.030
Silicon (Si), % 0 to 1.0
0 to 0.45
Sulfur (S), % 0 to 0.025
0 to 0.020
Vanadium (V), % 0 to 0.040
0.22 to 0.3