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ASTM A387 Grade 91 Class 2 vs. SAE-AISI M34 Steel

Both ASTM A387 grade 91 class 2 and SAE-AISI M34 steel are iron alloys. They have 80% 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 M34 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
77
Tensile Strength: Ultimate (UTS), MPa 670
800 to 2170

Thermal Properties

Latent Heat of Fusion, J/g 270
270
Melting Completion (Liquidus), °C 1460
1540
Melting Onset (Solidus), °C 1420
1500
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 26
24
Thermal Expansion, µm/m-K 13
12

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
32
Density, g/cm3 7.8
8.2
Embodied Carbon, kg CO2/kg material 2.6
9.5
Embodied Energy, MJ/kg 37
140
Embodied Water, L/kg 88
150

Common Calculations

PREN (Pitting Resistance) 13
35
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 24
27 to 74
Strength to Weight: Bending, points 22
23 to 46
Thermal Diffusivity, mm2/s 6.9
6.7
Thermal Shock Resistance, points 19
25 to 67

Alloy Composition

Aluminum (Al), % 0 to 0.020
0
Carbon (C), % 0.080 to 0.12
0.85 to 0.92
Chromium (Cr), % 8.0 to 9.5
3.5 to 4.0
Cobalt (Co), % 0
7.8 to 8.8
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 87.3 to 90.3
71.3 to 76.5
Manganese (Mn), % 0.3 to 0.6
0.15 to 0.4
Molybdenum (Mo), % 0.85 to 1.1
7.8 to 9.2
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
0.2 to 0.45
Sulfur (S), % 0 to 0.010
0 to 0.030
Titanium (Ti), % 0 to 0.010
0
Tungsten (W), % 0
1.4 to 2.1
Vanadium (V), % 0.18 to 0.25
1.9 to 2.3
Zirconium (Zr), % 0 to 0.010
0