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EN 1.6580 +A Steel vs. ASTM A387 Grade 9 Class 1

Both EN 1.6580 +A steel and ASTM A387 grade 9 class 1 are iron alloys. Both are furnished in the annealed condition. They have a moderately high 92% of their average alloy composition in common.

For each property being compared, the top bar is EN 1.6580 +A steel and the bottom bar is ASTM A387 grade 9 class 1.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
150
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 19
20
Fatigue Strength, MPa 310
160
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
75
Shear Strength, MPa 450
310
Tensile Strength: Ultimate (UTS), MPa 720
500
Tensile Strength: Yield (Proof), MPa 460
230

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Maximum Temperature: Mechanical, °C 450
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 40
26
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
9.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.9
10

Otherwise Unclassified Properties

Base Metal Price, % relative 4.3
6.5
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.8
2.1
Embodied Energy, MJ/kg 23
28
Embodied Water, L/kg 59
87

Common Calculations

PREN (Pitting Resistance) 3.3
12
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
83
Resilience: Unit (Modulus of Resilience), kJ/m3 560
140
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 26
18
Strength to Weight: Bending, points 23
18
Thermal Diffusivity, mm2/s 11
6.9
Thermal Shock Resistance, points 21
14

Alloy Composition

Carbon (C), % 0.26 to 0.34
0 to 0.15
Chromium (Cr), % 1.8 to 2.2
8.0 to 10
Iron (Fe), % 93.7 to 95.5
87.1 to 90.8
Manganese (Mn), % 0.3 to 0.6
0.3 to 0.6
Molybdenum (Mo), % 0.3 to 0.5
0.9 to 1.1
Nickel (Ni), % 1.8 to 2.2
0
Phosphorus (P), % 0 to 0.035
0 to 0.025
Silicon (Si), % 0 to 0.4
0 to 1.0
Sulfur (S), % 0 to 0.035
0 to 0.025
Vanadium (V), % 0
0 to 0.040