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ASTM A387 Grade 21L Class 1 vs. ASTM A369 Grade FP5

Both ASTM A387 grade 21L class 1 and ASTM A369 grade FP5 are iron alloys. Both are furnished in the annealed condition. They have a very high 98% of their average alloy composition in common.

For each property being compared, the top bar is ASTM A387 grade 21L class 1 and the bottom bar is ASTM A369 grade FP5.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
140
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 21
20
Fatigue Strength, MPa 160
160
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
74
Shear Strength, MPa 310
300
Tensile Strength: Ultimate (UTS), MPa 500
470
Tensile Strength: Yield (Proof), MPa 230
240

Thermal Properties

Latent Heat of Fusion, J/g 260
260
Maximum Temperature: Mechanical, °C 480
510
Melting Completion (Liquidus), °C 1470
1460
Melting Onset (Solidus), °C 1430
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 41
40
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
8.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
9.2

Otherwise Unclassified Properties

Base Metal Price, % relative 4.1
4.3
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.8
1.7
Embodied Energy, MJ/kg 23
23
Embodied Water, L/kg 62
69

Common Calculations

PREN (Pitting Resistance) 6.4
6.8
Resilience: Ultimate (Unit Rupture Work), MJ/m3 84
80
Resilience: Unit (Modulus of Resilience), kJ/m3 140
140
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 18
17
Strength to Weight: Bending, points 18
17
Thermal Diffusivity, mm2/s 11
11
Thermal Shock Resistance, points 14
13

Alloy Composition

Carbon (C), % 0 to 0.1
0 to 0.15
Chromium (Cr), % 2.8 to 3.3
4.0 to 6.0
Iron (Fe), % 94.4 to 96.1
92.1 to 95.3
Manganese (Mn), % 0.3 to 0.6
0.3 to 0.6
Molybdenum (Mo), % 0.9 to 1.1
0.45 to 0.65
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