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EN 1.6958 Steel vs. ASTM A387 Grade 91 Class 2

Both EN 1.6958 steel and ASTM A387 grade 91 class 2 are iron alloys. They have a moderately high 92% of their average alloy composition in common. There are 32 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 EN 1.6958 steel and the bottom bar is ASTM A387 grade 91 class 2.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 340
200
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 16
20
Fatigue Strength, MPa 700
330
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
75
Shear Strength, MPa 700
420
Tensile Strength: Ultimate (UTS), MPa 1140
670
Tensile Strength: Yield (Proof), MPa 1070
470

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
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 47
26
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.9
8.9
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
10

Otherwise Unclassified Properties

Base Metal Price, % relative 5.0
7.0
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 2.0
2.6
Embodied Energy, MJ/kg 27
37
Embodied Water, L/kg 60
88

Common Calculations

PREN (Pitting Resistance) 2.9
13
Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
120
Resilience: Unit (Modulus of Resilience), kJ/m3 3050
580
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 40
24
Strength to Weight: Bending, points 31
22
Thermal Diffusivity, mm2/s 13
6.9
Thermal Shock Resistance, points 39
19

Alloy Composition

Aluminum (Al), % 0.0050 to 0.050
0 to 0.020
Carbon (C), % 0.25 to 0.3
0.080 to 0.12
Chromium (Cr), % 1.2 to 1.7
8.0 to 9.5
Iron (Fe), % 92.6 to 94.5
87.3 to 90.3
Manganese (Mn), % 0.2 to 0.5
0.3 to 0.6
Molybdenum (Mo), % 0.35 to 0.55
0.85 to 1.1
Nickel (Ni), % 3.3 to 3.8
0 to 0.4
Niobium (Nb), % 0
0.060 to 0.1
Nitrogen (N), % 0
0.030 to 0.070
Phosphorus (P), % 0 to 0.020
0 to 0.020
Silicon (Si), % 0.15 to 0.3
0.2 to 0.5
Sulfur (S), % 0 to 0.015
0 to 0.010
Titanium (Ti), % 0
0 to 0.010
Vanadium (V), % 0 to 0.12
0.18 to 0.25
Zirconium (Zr), % 0
0 to 0.010