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EN 1.7711 Steel vs. ASTM A387 Grade 91 Class 2

Both EN 1.7711 steel and ASTM A387 grade 91 class 2 are iron alloys. They have a moderately high 91% of their average alloy composition in common.

For each property being compared, the top bar is EN 1.7711 steel and the bottom bar is ASTM A387 grade 91 class 2.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210 to 280
200
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 16 to 22
20
Fatigue Strength, MPa 290 to 520
330
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
75
Shear Strength, MPa 440 to 570
420
Tensile Strength: Ultimate (UTS), MPa 690 to 930
670
Tensile Strength: Yield (Proof), MPa 400 to 800
470

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Maximum Temperature: Mechanical, °C 430
600
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 33
26
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
8.9
Electrical Conductivity: Equal Weight (Specific), % IACS 8.5
10

Otherwise Unclassified Properties

Base Metal Price, % relative 3.0
7.0
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.3
2.6
Embodied Energy, MJ/kg 32
37
Embodied Water, L/kg 54
88

Common Calculations

PREN (Pitting Resistance) 2.9
13
Resilience: Ultimate (Unit Rupture Work), MJ/m3 130 to 140
120
Resilience: Unit (Modulus of Resilience), kJ/m3 430 to 1690
580
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 24 to 33
24
Strength to Weight: Bending, points 22 to 27
22
Thermal Diffusivity, mm2/s 8.9
6.9
Thermal Shock Resistance, points 24 to 32
19

Alloy Composition

Aluminum (Al), % 0 to 0.015
0 to 0.020
Carbon (C), % 0.36 to 0.44
0.080 to 0.12
Chromium (Cr), % 0.9 to 1.2
8.0 to 9.5
Iron (Fe), % 96 to 97.5
87.3 to 90.3
Manganese (Mn), % 0.45 to 0.85
0.3 to 0.6
Molybdenum (Mo), % 0.5 to 0.65
0.85 to 1.1
Nickel (Ni), % 0
0 to 0.4
Niobium (Nb), % 0
0.060 to 0.1
Nitrogen (N), % 0
0.030 to 0.070
Phosphorus (P), % 0 to 0.025
0 to 0.020
Silicon (Si), % 0 to 0.4
0.2 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.010
Titanium (Ti), % 0
0 to 0.010
Vanadium (V), % 0.25 to 0.35
0.18 to 0.25
Zirconium (Zr), % 0
0 to 0.010