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ASTM A387 Grade 91 Class 2 vs. SAE-AISI D7 Steel

Both ASTM A387 grade 91 class 2 and SAE-AISI D7 steel are iron alloys. They have a moderately high 90% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (10, 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 D7 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
73
Tensile Strength: Ultimate (UTS), MPa 670
800 to 2120

Thermal Properties

Latent Heat of Fusion, J/g 270
270
Melting Completion (Liquidus), °C 1460
1440
Melting Onset (Solidus), °C 1420
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 26
27
Thermal Expansion, µm/m-K 13
11

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
10
Density, g/cm3 7.8
7.6
Embodied Carbon, kg CO2/kg material 2.6
11
Embodied Energy, MJ/kg 37
180
Embodied Water, L/kg 88
130

Common Calculations

PREN (Pitting Resistance) 13
16
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 24
29 to 78
Strength to Weight: Bending, points 22
25 to 48
Thermal Diffusivity, mm2/s 6.9
7.4
Thermal Shock Resistance, points 19
27 to 72

Alloy Composition

Aluminum (Al), % 0 to 0.020
0
Carbon (C), % 0.080 to 0.12
2.2 to 2.5
Chromium (Cr), % 8.0 to 9.5
11.5 to 13.5
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 87.3 to 90.3
76.6 to 81.9
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
3.8 to 4.4
Zirconium (Zr), % 0 to 0.010
0