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ASTM A369 Grade FP9 vs. S31277 Stainless Steel

Both ASTM A369 grade FP9 and S31277 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 52% of their average alloy composition in common. There are 27 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is ASTM A369 grade FP9 and the bottom bar is S31277 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 20
45
Fatigue Strength, MPa 160
380
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
80
Shear Strength, MPa 300
600
Tensile Strength: Ultimate (UTS), MPa 470
860
Tensile Strength: Yield (Proof), MPa 240
410

Thermal Properties

Latent Heat of Fusion, J/g 270
310
Maximum Temperature: Mechanical, °C 600
1100
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1410
1410
Specific Heat Capacity, J/kg-K 480
460
Thermal Expansion, µm/m-K 13
16

Otherwise Unclassified Properties

Base Metal Price, % relative 6.5
36
Density, g/cm3 7.8
8.1
Embodied Carbon, kg CO2/kg material 2.0
6.7
Embodied Energy, MJ/kg 28
90
Embodied Water, L/kg 87
220

Common Calculations

PREN (Pitting Resistance) 12
51
Resilience: Ultimate (Unit Rupture Work), MJ/m3 80
320
Resilience: Unit (Modulus of Resilience), kJ/m3 140
410
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 17
29
Strength to Weight: Bending, points 17
25
Thermal Shock Resistance, points 13
19

Alloy Composition

Carbon (C), % 0 to 0.15
0 to 0.020
Chromium (Cr), % 8.0 to 10
20.5 to 23
Copper (Cu), % 0
0.5 to 1.5
Iron (Fe), % 87.1 to 90.3
35.5 to 46.2
Manganese (Mn), % 0.3 to 0.6
0 to 3.0
Molybdenum (Mo), % 0.9 to 1.1
6.5 to 8.0
Nickel (Ni), % 0
26 to 28
Nitrogen (N), % 0
0.3 to 0.4
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0.5 to 1.0
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.010