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ASTM A369 Grade FP91 vs. S21904 Stainless Steel

Both ASTM A369 grade FP91 and S21904 stainless steel are iron alloys. They have 73% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is ASTM A369 grade FP91 and the bottom bar is S21904 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200
210 to 300
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 19
17 to 51
Fatigue Strength, MPa 320
380 to 550
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
78
Shear Strength, MPa 410
510 to 620
Tensile Strength: Ultimate (UTS), MPa 670
700 to 1000
Tensile Strength: Yield (Proof), MPa 460
390 to 910

Thermal Properties

Latent Heat of Fusion, J/g 270
290
Maximum Temperature: Mechanical, °C 600
980
Melting Completion (Liquidus), °C 1460
1400
Melting Onset (Solidus), °C 1420
1350
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 26
14
Thermal Expansion, µm/m-K 13
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.9
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 10
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
15
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 2.6
3.0
Embodied Energy, MJ/kg 37
43
Embodied Water, L/kg 88
160

Common Calculations

PREN (Pitting Resistance) 13
25
Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
160 to 310
Resilience: Unit (Modulus of Resilience), kJ/m3 560
380 to 2070
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 24
25 to 36
Strength to Weight: Bending, points 22
23 to 29
Thermal Diffusivity, mm2/s 6.9
3.8
Thermal Shock Resistance, points 18
15 to 21

Alloy Composition

Aluminum (Al), % 0 to 0.020
0
Carbon (C), % 0.080 to 0.12
0 to 0.040
Chromium (Cr), % 8.0 to 9.5
19 to 21.5
Iron (Fe), % 87.3 to 90.3
59.5 to 67.4
Manganese (Mn), % 0.3 to 0.6
8.0 to 10
Molybdenum (Mo), % 0.85 to 1.1
0
Nickel (Ni), % 0 to 0.4
5.5 to 7.5
Niobium (Nb), % 0.060 to 0.1
0
Nitrogen (N), % 0.030 to 0.070
0.15 to 0.4
Phosphorus (P), % 0 to 0.025
0 to 0.045
Silicon (Si), % 0.2 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.025
0 to 0.030
Titanium (Ti), % 0 to 0.010
0
Vanadium (V), % 0.18 to 0.25
0
Zirconium (Zr), % 0 to 0.010
0