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ASTM A387 Grade 91 Class 2 vs. ASTM Grade LC2-1 Steel

Both ASTM A387 grade 91 class 2 and ASTM grade LC2-1 steel are iron alloys. Both are furnished in the normalized and tempered condition. They have a moderately high 92% 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 ASTM grade LC2-1 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200
240
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 20
20
Fatigue Strength, MPa 330
430
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
73
Tensile Strength: Ultimate (UTS), MPa 670
810
Tensile Strength: Yield (Proof), MPa 470
630

Thermal Properties

Latent Heat of Fusion, J/g 270
260
Maximum Temperature: Mechanical, °C 600
450
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 26
46
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.9
8.0
Electrical Conductivity: Equal Weight (Specific), % IACS 10
9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
5.0
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 2.6
1.9
Embodied Energy, MJ/kg 37
25
Embodied Water, L/kg 88
60

Common Calculations

PREN (Pitting Resistance) 13
3.1
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
150
Resilience: Unit (Modulus of Resilience), kJ/m3 580
1040
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 24
29
Strength to Weight: Bending, points 22
25
Thermal Diffusivity, mm2/s 6.9
12
Thermal Shock Resistance, points 19
24

Alloy Composition

Aluminum (Al), % 0 to 0.020
0
Carbon (C), % 0.080 to 0.12
0 to 0.22
Chromium (Cr), % 8.0 to 9.5
1.4 to 1.9
Iron (Fe), % 87.3 to 90.3
92.5 to 95.3
Manganese (Mn), % 0.3 to 0.6
0.55 to 0.75
Molybdenum (Mo), % 0.85 to 1.1
0.3 to 0.6
Nickel (Ni), % 0 to 0.4
2.5 to 3.5
Niobium (Nb), % 0.060 to 0.1
0
Nitrogen (N), % 0.030 to 0.070
0
Phosphorus (P), % 0 to 0.020
0 to 0.040
Silicon (Si), % 0.2 to 0.5
0 to 0.5
Sulfur (S), % 0 to 0.010
0 to 0.045
Titanium (Ti), % 0 to 0.010
0
Vanadium (V), % 0.18 to 0.25
0
Zirconium (Zr), % 0 to 0.010
0