ASTM A369 Grade FP22 vs. ASTM A387 Grade 21L Class 1
Both ASTM A369 grade FP22 and ASTM A387 grade 21L class 1 are iron alloys. Both are furnished in the annealed condition. Their average alloy composition is basically identical.
For each property being compared, the top bar is ASTM A369 grade FP22 and the bottom bar is ASTM A387 grade 21L class 1.
Metric UnitsUS Customary Units
Mechanical Properties
Brinell Hardness | 140 | |
150 |
Elastic (Young's, Tensile) Modulus, GPa | 190 | |
190 |
Elongation at Break, % | 20 | |
21 |
Fatigue Strength, MPa | 160 | |
160 |
Poisson's Ratio | 0.29 | |
0.29 |
Shear Modulus, GPa | 74 | |
74 |
Shear Strength, MPa | 300 | |
310 |
Tensile Strength: Ultimate (UTS), MPa | 470 | |
500 |
Tensile Strength: Yield (Proof), MPa | 240 | |
230 |
Thermal Properties
Latent Heat of Fusion, J/g | 260 | |
260 |
Maximum Temperature: Mechanical, °C | 460 | |
480 |
Melting Completion (Liquidus), °C | 1470 | |
1470 |
Melting Onset (Solidus), °C | 1430 | |
1430 |
Specific Heat Capacity, J/kg-K | 470 | |
470 |
Thermal Conductivity, W/m-K | 39 | |
41 |
Thermal Expansion, µm/m-K | 13 | |
13 |
Electrical Properties
Electrical Conductivity: Equal Volume, % IACS | 7.6 | |
7.6 |
Electrical Conductivity: Equal Weight (Specific), % IACS | 8.7 | |
8.8 |
Otherwise Unclassified Properties
Base Metal Price, % relative | 3.8 | |
4.1 |
Density, g/cm3 | 7.9 | |
7.9 |
Embodied Carbon, kg CO2/kg material | 1.7 | |
1.8 |
Embodied Energy, MJ/kg | 23 | |
23 |
Embodied Water, L/kg | 58 | |
62 |
Common Calculations
PREN (Pitting Resistance) | 5.5 | |
6.4 |
Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 80 | |
84 |
Resilience: Unit (Modulus of Resilience), kJ/m3 | 150 | |
140 |
Stiffness to Weight: Axial, points | 13 | |
13 |
Stiffness to Weight: Bending, points | 24 | |
24 |
Strength to Weight: Axial, points | 17 | |
18 |
Strength to Weight: Bending, points | 17 | |
18 |
Thermal Diffusivity, mm2/s | 11 | |
11 |
Thermal Shock Resistance, points | 14 | |
14 |
Alloy Composition
Carbon (C), % | 0.050 to 0.15 | |
0 to 0.1 |
Chromium (Cr), % | 1.9 to 2.6 | |
2.8 to 3.3 |
Iron (Fe), % | 95 to 96.9 | |
94.4 to 96.1 |
Manganese (Mn), % | 0.3 to 0.6 | |
0.3 to 0.6 |
Molybdenum (Mo), % | 0.87 to 1.1 | |
0.9 to 1.1 |
Phosphorus (P), % | 0 to 0.025 | |
0 to 0.025 |
Silicon (Si), % | 0 to 0.5 | |
0 to 0.5 |
Sulfur (S), % | 0 to 0.025 | |
0 to 0.025 |