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ASTM A387 Grade 91 Class 2 vs. ACI-ASTM CN3MN Steel

Both ASTM A387 grade 91 class 2 and ACI-ASTM CN3MN steel are iron alloys. They have 57% 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 91 class 2 and the bottom bar is ACI-ASTM CN3MN steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200
180
Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 20
39
Fatigue Strength, MPa 330
250
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
80
Tensile Strength: Ultimate (UTS), MPa 670
620
Tensile Strength: Yield (Proof), MPa 470
300

Thermal Properties

Latent Heat of Fusion, J/g 270
310
Maximum Temperature: Mechanical, °C 600
1100
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 470
460
Thermal Conductivity, W/m-K 26
13
Thermal Expansion, µm/m-K 13
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.9
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 10
2.0

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
33
Density, g/cm3 7.8
8.1
Embodied Carbon, kg CO2/kg material 2.6
6.2
Embodied Energy, MJ/kg 37
84
Embodied Water, L/kg 88
200

Common Calculations

PREN (Pitting Resistance) 13
46
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
200
Resilience: Unit (Modulus of Resilience), kJ/m3 580
210
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 24
21
Strength to Weight: Bending, points 22
20
Thermal Diffusivity, mm2/s 6.9
3.4
Thermal Shock Resistance, points 19
14

Alloy Composition

Aluminum (Al), % 0 to 0.020
0
Carbon (C), % 0.080 to 0.12
0 to 0.030
Chromium (Cr), % 8.0 to 9.5
20 to 22
Copper (Cu), % 0
0 to 0.75
Iron (Fe), % 87.3 to 90.3
41.4 to 50.3
Manganese (Mn), % 0.3 to 0.6
0 to 2.0
Molybdenum (Mo), % 0.85 to 1.1
6.0 to 7.0
Nickel (Ni), % 0 to 0.4
23.5 to 25.5
Niobium (Nb), % 0.060 to 0.1
0
Nitrogen (N), % 0.030 to 0.070
0.18 to 0.26
Phosphorus (P), % 0 to 0.020
0 to 0.040
Silicon (Si), % 0.2 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.010
0 to 0.010
Titanium (Ti), % 0 to 0.010
0
Vanadium (V), % 0.18 to 0.25
0
Zirconium (Zr), % 0 to 0.010
0