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ASTM A369 Grade FP21 vs. S15500 Stainless Steel

Both ASTM A369 grade FP21 and S15500 stainless steel are iron alloys. They have 80% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is ASTM A369 grade FP21 and the bottom bar is S15500 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
290 to 430
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 20
6.8 to 16
Fatigue Strength, MPa 160
350 to 650
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 74
75
Shear Strength, MPa 300
540 to 870
Tensile Strength: Ultimate (UTS), MPa 470
890 to 1490
Tensile Strength: Yield (Proof), MPa 240
590 to 1310

Thermal Properties

Latent Heat of Fusion, J/g 260
280
Maximum Temperature: Mechanical, °C 470
820
Melting Completion (Liquidus), °C 1470
1430
Melting Onset (Solidus), °C 1430
1380
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 41
17
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.7
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 4.0
13
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.8
2.7
Embodied Energy, MJ/kg 23
39
Embodied Water, L/kg 61
130

Common Calculations

PREN (Pitting Resistance) 6.2
15
Resilience: Ultimate (Unit Rupture Work), MJ/m3 80
98 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 150
890 to 4460
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 17
32 to 53
Strength to Weight: Bending, points 17
26 to 37
Thermal Diffusivity, mm2/s 11
4.6
Thermal Shock Resistance, points 14
30 to 50

Alloy Composition

Carbon (C), % 0.050 to 0.15
0 to 0.070
Chromium (Cr), % 2.7 to 3.4
14 to 15.5
Copper (Cu), % 0
2.5 to 4.5
Iron (Fe), % 94.3 to 96.2
71.9 to 79.9
Manganese (Mn), % 0.3 to 0.6
0 to 1.0
Molybdenum (Mo), % 0.8 to 1.1
0
Nickel (Ni), % 0
3.5 to 5.5
Niobium (Nb), % 0
0.15 to 0.45
Phosphorus (P), % 0 to 0.025
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.025
0 to 0.030