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AISI 329 Stainless Steel vs. ASTM A387 Grade 91 Class 2

Both AISI 329 stainless steel and ASTM A387 grade 91 class 2 are iron alloys. They have 79% of their average alloy composition in common. There are 32 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 AISI 329 stainless steel and the bottom bar is ASTM A387 grade 91 class 2.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 240
200
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 17
20
Fatigue Strength, MPa 330
330
Poisson's Ratio 0.27
0.28
Shear Modulus, GPa 80
75
Shear Strength, MPa 440
420
Tensile Strength: Ultimate (UTS), MPa 710
670
Tensile Strength: Yield (Proof), MPa 540
470

Thermal Properties

Latent Heat of Fusion, J/g 300
270
Maximum Temperature: Mechanical, °C 1100
600
Melting Completion (Liquidus), °C 1440
1460
Melting Onset (Solidus), °C 1390
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 16
26
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
8.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
10

Otherwise Unclassified Properties

Base Metal Price, % relative 16
7.0
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 3.1
2.6
Embodied Energy, MJ/kg 44
37
Embodied Water, L/kg 170
88

Common Calculations

PREN (Pitting Resistance) 30
13
Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
120
Resilience: Unit (Modulus of Resilience), kJ/m3 730
580
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 25
24
Strength to Weight: Bending, points 23
22
Thermal Diffusivity, mm2/s 4.3
6.9
Thermal Shock Resistance, points 19
19

Alloy Composition

Aluminum (Al), % 0
0 to 0.020
Carbon (C), % 0 to 0.080
0.080 to 0.12
Chromium (Cr), % 23 to 28
8.0 to 9.5
Iron (Fe), % 63.1 to 74
87.3 to 90.3
Manganese (Mn), % 0 to 1.0
0.3 to 0.6
Molybdenum (Mo), % 1.0 to 2.0
0.85 to 1.1
Nickel (Ni), % 2.0 to 5.0
0 to 0.4
Niobium (Nb), % 0
0.060 to 0.1
Nitrogen (N), % 0
0.030 to 0.070
Phosphorus (P), % 0 to 0.040
0 to 0.020
Silicon (Si), % 0 to 0.75
0.2 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.010
Titanium (Ti), % 0
0 to 0.010
Vanadium (V), % 0
0.18 to 0.25
Zirconium (Zr), % 0
0 to 0.010