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ASTM A387 Grade 91 Class 2 vs. SAE-AISI M44 Steel

Both ASTM A387 grade 91 class 2 and SAE-AISI M44 steel are iron alloys. They have 74% 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 M44 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
78
Tensile Strength: Ultimate (UTS), MPa 670
870 to 2290

Thermal Properties

Latent Heat of Fusion, J/g 270
270
Melting Completion (Liquidus), °C 1460
1590
Melting Onset (Solidus), °C 1420
1540
Specific Heat Capacity, J/kg-K 470
440
Thermal Conductivity, W/m-K 26
14
Thermal Expansion, µm/m-K 13
12

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
43
Density, g/cm3 7.8
8.4
Embodied Carbon, kg CO2/kg material 2.6
9.9
Embodied Energy, MJ/kg 37
150
Embodied Water, L/kg 88
170

Common Calculations

PREN (Pitting Resistance) 13
35
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 24
28 to 75
Strength to Weight: Bending, points 22
24 to 46
Thermal Diffusivity, mm2/s 6.9
3.7
Thermal Shock Resistance, points 19
27 to 70

Alloy Composition

Aluminum (Al), % 0 to 0.020
0
Carbon (C), % 0.080 to 0.12
1.1 to 1.2
Chromium (Cr), % 8.0 to 9.5
4.0 to 4.8
Cobalt (Co), % 0
11 to 12.3
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 87.3 to 90.3
65.3 to 70.6
Manganese (Mn), % 0.3 to 0.6
0.2 to 0.4
Molybdenum (Mo), % 0.85 to 1.1
6.0 to 7.0
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
0.3 to 0.55
Sulfur (S), % 0 to 0.010
0 to 0.030
Titanium (Ti), % 0 to 0.010
0
Tungsten (W), % 0
5.0 to 5.8
Vanadium (V), % 0.18 to 0.25
1.9 to 2.2
Zirconium (Zr), % 0 to 0.010
0