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AISI 384 Stainless Steel vs. ASTM A369 Grade FP21

Both AISI 384 stainless steel and ASTM A369 grade FP21 are iron alloys. Both are furnished in the annealed condition. They have 68% of their average alloy composition in common. There are 26 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is AISI 384 stainless steel and the bottom bar is ASTM A369 grade FP21.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
140
Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
74
Tensile Strength: Ultimate (UTS), MPa 480
470

Thermal Properties

Latent Heat of Fusion, J/g 290
260
Maximum Temperature: Mechanical, °C 910
470
Melting Completion (Liquidus), °C 1420
1470
Melting Onset (Solidus), °C 1380
1430
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 16
41
Thermal Expansion, µm/m-K 16
13

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 20
4.0
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 3.7
1.8
Embodied Energy, MJ/kg 52
23
Embodied Water, L/kg 150
61

Common Calculations

PREN (Pitting Resistance) 16
6.2
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 17
17
Strength to Weight: Bending, points 17
17
Thermal Diffusivity, mm2/s 4.3
11
Thermal Shock Resistance, points 11
14

Alloy Composition

Carbon (C), % 0 to 0.040
0.050 to 0.15
Chromium (Cr), % 15 to 17
2.7 to 3.4
Iron (Fe), % 60.9 to 68
94.3 to 96.2
Manganese (Mn), % 0 to 2.0
0.3 to 0.6
Molybdenum (Mo), % 0
0.8 to 1.1
Nickel (Ni), % 17 to 19
0
Phosphorus (P), % 0 to 0.045
0 to 0.025
Silicon (Si), % 0 to 1.0
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.025