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ASTM A369 Grade FP21 vs. AISI 317L Stainless Steel

Both ASTM A369 grade FP21 and AISI 317L stainless steel are iron alloys. Both are furnished in the annealed condition. They have 68% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is ASTM A369 grade FP21 and the bottom bar is AISI 317L stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
180
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 20
44
Fatigue Strength, MPa 160
220
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 74
82
Shear Strength, MPa 300
380
Tensile Strength: Ultimate (UTS), MPa 470
550
Tensile Strength: Yield (Proof), MPa 240
250

Thermal Properties

Latent Heat of Fusion, J/g 260
290
Maximum Temperature: Mechanical, °C 470
1010
Melting Completion (Liquidus), °C 1470
1400
Melting Onset (Solidus), °C 1430
1380
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 41
14
Thermal Expansion, µm/m-K 13
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.7
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 4.0
21
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.8
4.3
Embodied Energy, MJ/kg 23
59
Embodied Water, L/kg 61
160

Common Calculations

PREN (Pitting Resistance) 6.2
31
Resilience: Ultimate (Unit Rupture Work), MJ/m3 80
200
Resilience: Unit (Modulus of Resilience), kJ/m3 150
150
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 17
19
Strength to Weight: Bending, points 17
19
Thermal Diffusivity, mm2/s 11
3.8
Thermal Shock Resistance, points 14
12

Alloy Composition

Carbon (C), % 0.050 to 0.15
0 to 0.030
Chromium (Cr), % 2.7 to 3.4
18 to 20
Iron (Fe), % 94.3 to 96.2
58 to 68
Manganese (Mn), % 0.3 to 0.6
0 to 2.0
Molybdenum (Mo), % 0.8 to 1.1
3.0 to 4.0
Nickel (Ni), % 0
11 to 15
Nitrogen (N), % 0
0 to 0.1
Phosphorus (P), % 0 to 0.025
0 to 0.045
Silicon (Si), % 0 to 0.5
0 to 0.75
Sulfur (S), % 0 to 0.025
0 to 0.030