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EN 1.7711 Steel vs. ASTM A387 Grade 12 Steel

Both EN 1.7711 steel and ASTM A387 grade 12 steel are iron alloys. Their average alloy composition is basically identical.

For each property being compared, the top bar is EN 1.7711 steel and the bottom bar is ASTM A387 grade 12 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210 to 280
140 to 160
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 16 to 22
25
Fatigue Strength, MPa 290 to 520
190 to 230
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 440 to 570
300 to 330
Tensile Strength: Ultimate (UTS), MPa 690 to 930
470 to 520
Tensile Strength: Yield (Proof), MPa 400 to 800
260 to 310

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 430
430
Melting Completion (Liquidus), °C 1460
1470
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 33
44
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.5
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 3.0
2.8
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.3
1.6
Embodied Energy, MJ/kg 32
21
Embodied Water, L/kg 54
51

Common Calculations

PREN (Pitting Resistance) 2.9
2.7
Resilience: Ultimate (Unit Rupture Work), MJ/m3 130 to 140
98 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 430 to 1690
180 to 250
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 24 to 33
16 to 18
Strength to Weight: Bending, points 22 to 27
17 to 18
Thermal Diffusivity, mm2/s 8.9
12
Thermal Shock Resistance, points 24 to 32
14 to 15

Alloy Composition

Aluminum (Al), % 0 to 0.015
0
Carbon (C), % 0.36 to 0.44
0.050 to 0.17
Chromium (Cr), % 0.9 to 1.2
0.8 to 1.2
Iron (Fe), % 96 to 97.5
97 to 98.2
Manganese (Mn), % 0.45 to 0.85
0.4 to 0.65
Molybdenum (Mo), % 0.5 to 0.65
0.45 to 0.6
Phosphorus (P), % 0 to 0.025
0 to 0.025
Silicon (Si), % 0 to 0.4
0.15 to 0.4
Sulfur (S), % 0 to 0.030
0 to 0.025
Vanadium (V), % 0.25 to 0.35
0

Comparable Variants