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AISI 420 Stainless Steel vs. ASTM A369 Grade FP21

Both AISI 420 stainless steel and ASTM A369 grade FP21 are iron alloys. They have 89% 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 AISI 420 stainless steel and the bottom bar is ASTM A369 grade FP21.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
140
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 8.0 to 15
20
Fatigue Strength, MPa 220 to 670
160
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
74
Shear Strength, MPa 420 to 1010
300
Tensile Strength: Ultimate (UTS), MPa 690 to 1720
470
Tensile Strength: Yield (Proof), MPa 380 to 1310
240

Thermal Properties

Latent Heat of Fusion, J/g 280
260
Maximum Temperature: Mechanical, °C 620
470
Melting Completion (Liquidus), °C 1510
1470
Melting Onset (Solidus), °C 1450
1430
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 27
41
Thermal Expansion, µm/m-K 10
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.0
7.7
Electrical Conductivity: Equal Weight (Specific), % IACS 3.5
8.8

Otherwise Unclassified Properties

Base Metal Price, % relative 7.5
4.0
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 2.0
1.8
Embodied Energy, MJ/kg 28
23
Embodied Water, L/kg 100
61

Common Calculations

PREN (Pitting Resistance) 14
6.2
Resilience: Ultimate (Unit Rupture Work), MJ/m3 88 to 130
80
Resilience: Unit (Modulus of Resilience), kJ/m3 380 to 4410
150
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 25 to 62
17
Strength to Weight: Bending, points 22 to 41
17
Thermal Diffusivity, mm2/s 7.3
11
Thermal Shock Resistance, points 25 to 62
14

Alloy Composition

Carbon (C), % 0.15 to 0.4
0.050 to 0.15
Chromium (Cr), % 12 to 14
2.7 to 3.4
Iron (Fe), % 82.3 to 87.9
94.3 to 96.2
Manganese (Mn), % 0 to 1.0
0.3 to 0.6
Molybdenum (Mo), % 0 to 0.5
0.8 to 1.1
Nickel (Ni), % 0 to 0.75
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