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ASTM A387 Grade 91 Class 2 vs. SAE-AISI D2 Steel

Both ASTM A387 grade 91 class 2 and SAE-AISI D2 steel are iron alloys. They have a moderately high 95% of their average alloy composition in common. There are 30 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 SAE-AISI D2 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 20
5.0 to 16
Fatigue Strength, MPa 330
310 to 860
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
75
Shear Strength, MPa 420
460 to 1160
Tensile Strength: Ultimate (UTS), MPa 670
760 to 2000
Tensile Strength: Yield (Proof), MPa 470
470 to 1510

Thermal Properties

Latent Heat of Fusion, J/g 270
270
Melting Completion (Liquidus), °C 1460
1440
Melting Onset (Solidus), °C 1420
1390
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 26
31
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.9
4.3
Electrical Conductivity: Equal Weight (Specific), % IACS 10
5.1

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
8.0
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 2.6
3.4
Embodied Energy, MJ/kg 37
50
Embodied Water, L/kg 88
100

Common Calculations

PREN (Pitting Resistance) 13
15
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
92 to 100
Resilience: Unit (Modulus of Resilience), kJ/m3 580
570 to 5940
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 24
27 to 72
Strength to Weight: Bending, points 22
24 to 46
Thermal Diffusivity, mm2/s 6.9
8.3
Thermal Shock Resistance, points 19
25 to 67

Alloy Composition

Aluminum (Al), % 0 to 0.020
0
Carbon (C), % 0.080 to 0.12
1.4 to 1.6
Chromium (Cr), % 8.0 to 9.5
11 to 13
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 87.3 to 90.3
81.3 to 86.9
Manganese (Mn), % 0.3 to 0.6
0 to 0.6
Molybdenum (Mo), % 0.85 to 1.1
0.7 to 1.2
Nickel (Ni), % 0 to 0.4
0 to 0.3
Niobium (Nb), % 0.060 to 0.1
0
Nitrogen (N), % 0.030 to 0.070
0
Phosphorus (P), % 0 to 0.020
0 to 0.030
Silicon (Si), % 0.2 to 0.5
0 to 0.6
Sulfur (S), % 0 to 0.010
0 to 0.030
Titanium (Ti), % 0 to 0.010
0
Vanadium (V), % 0.18 to 0.25
0 to 1.1
Zirconium (Zr), % 0 to 0.010
0