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AISI 302 Stainless Steel vs. ASTM A387 Grade 91 Class 2

Both AISI 302 stainless steel and ASTM A387 grade 91 class 2 are iron alloys. They have 81% 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 302 stainless steel and the bottom bar is ASTM A387 grade 91 class 2.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170 to 440
200
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 4.5 to 46
20
Fatigue Strength, MPa 210 to 520
330
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
75
Shear Strength, MPa 400 to 830
420
Tensile Strength: Ultimate (UTS), MPa 580 to 1430
670
Tensile Strength: Yield (Proof), MPa 230 to 1100
470

Thermal Properties

Latent Heat of Fusion, J/g 280
270
Maximum Temperature: Mechanical, °C 710
600
Melting Completion (Liquidus), °C 1420
1460
Melting Onset (Solidus), °C 1400
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 16
26
Thermal Expansion, µm/m-K 17
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
8.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.8
10

Otherwise Unclassified Properties

Base Metal Price, % relative 15
7.0
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.0
2.6
Embodied Energy, MJ/kg 42
37
Embodied Water, L/kg 140
88

Common Calculations

PREN (Pitting Resistance) 19
13
Resilience: Ultimate (Unit Rupture Work), MJ/m3 59 to 260
120
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 3070
580
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 21 to 51
24
Strength to Weight: Bending, points 20 to 36
22
Thermal Diffusivity, mm2/s 4.4
6.9
Thermal Shock Resistance, points 12 to 31
19

Alloy Composition

Aluminum (Al), % 0
0 to 0.020
Carbon (C), % 0 to 0.15
0.080 to 0.12
Chromium (Cr), % 17 to 19
8.0 to 9.5
Iron (Fe), % 67.9 to 75
87.3 to 90.3
Manganese (Mn), % 0 to 2.0
0.3 to 0.6
Molybdenum (Mo), % 0
0.85 to 1.1
Nickel (Ni), % 8.0 to 10
0 to 0.4
Niobium (Nb), % 0
0.060 to 0.1
Nitrogen (N), % 0 to 0.1
0.030 to 0.070
Phosphorus (P), % 0 to 0.045
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