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ASTM A369 Grade FP21 vs. S32615 Stainless Steel

Both ASTM A369 grade FP21 and S32615 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 57% of their average alloy composition in common. There are 28 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 FP21 and the bottom bar is S32615 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
170
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 20
28
Fatigue Strength, MPa 160
180
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 74
75
Shear Strength, MPa 300
400
Tensile Strength: Ultimate (UTS), MPa 470
620
Tensile Strength: Yield (Proof), MPa 240
250

Thermal Properties

Latent Heat of Fusion, J/g 260
370
Maximum Temperature: Mechanical, °C 470
990
Melting Completion (Liquidus), °C 1470
1350
Melting Onset (Solidus), °C 1430
1310
Specific Heat Capacity, J/kg-K 470
500
Thermal Expansion, µm/m-K 13
15

Otherwise Unclassified Properties

Base Metal Price, % relative 4.0
24
Density, g/cm3 7.8
7.6
Embodied Carbon, kg CO2/kg material 1.8
4.4
Embodied Energy, MJ/kg 23
63
Embodied Water, L/kg 61
170

Common Calculations

PREN (Pitting Resistance) 6.2
21
Resilience: Ultimate (Unit Rupture Work), MJ/m3 80
140
Resilience: Unit (Modulus of Resilience), kJ/m3 150
160
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 17
23
Strength to Weight: Bending, points 17
21
Thermal Shock Resistance, points 14
15

Alloy Composition

Carbon (C), % 0.050 to 0.15
0 to 0.070
Chromium (Cr), % 2.7 to 3.4
16.5 to 19.5
Copper (Cu), % 0
1.5 to 2.5
Iron (Fe), % 94.3 to 96.2
46.4 to 57.9
Manganese (Mn), % 0.3 to 0.6
0 to 2.0
Molybdenum (Mo), % 0.8 to 1.1
0.3 to 1.5
Nickel (Ni), % 0
19 to 22
Phosphorus (P), % 0 to 0.025
0 to 0.045
Silicon (Si), % 0 to 0.5
4.8 to 6.0
Sulfur (S), % 0 to 0.025
0 to 0.030