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S81921 Stainless Steel vs. ASTM A369 Grade FP21

Both S81921 stainless steel and ASTM A369 grade FP21 are iron alloys. Both are furnished in the annealed condition. They have 76% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is S81921 stainless steel and the bottom bar is ASTM A369 grade FP21.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 260
140
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 29
20
Fatigue Strength, MPa 370
160
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 79
74
Shear Strength, MPa 460
300
Tensile Strength: Ultimate (UTS), MPa 710
470
Tensile Strength: Yield (Proof), MPa 500
240

Thermal Properties

Latent Heat of Fusion, J/g 290
260
Maximum Temperature: Mechanical, °C 990
470
Melting Completion (Liquidus), °C 1430
1470
Melting Onset (Solidus), °C 1390
1430
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 15
41
Thermal Expansion, µm/m-K 13
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 14
4.0
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 2.9
1.8
Embodied Energy, MJ/kg 41
23
Embodied Water, L/kg 150
61

Common Calculations

PREN (Pitting Resistance) 28
6.2
Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
80
Resilience: Unit (Modulus of Resilience), kJ/m3 630
150
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 25
17
Strength to Weight: Bending, points 23
17
Thermal Diffusivity, mm2/s 4.0
11
Thermal Shock Resistance, points 20
14

Alloy Composition

Carbon (C), % 0 to 0.030
0.050 to 0.15
Chromium (Cr), % 19 to 22
2.7 to 3.4
Iron (Fe), % 66.7 to 75.9
94.3 to 96.2
Manganese (Mn), % 2.0 to 4.0
0.3 to 0.6
Molybdenum (Mo), % 1.0 to 2.0
0.8 to 1.1
Nickel (Ni), % 2.0 to 4.0
0
Nitrogen (N), % 0.14 to 0.2
0
Phosphorus (P), % 0 to 0.040
0 to 0.025
Silicon (Si), % 0 to 1.0
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.025