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ASTM A387 Grade 21L Class 1 vs. ASTM A369 Grade FP92

Both ASTM A387 grade 21L class 1 and ASTM A369 grade FP92 are iron alloys. They have a moderately high 92% 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 FP92.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
210
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 21
19
Fatigue Strength, MPa 160
330
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 74
76
Shear Strength, MPa 310
440
Tensile Strength: Ultimate (UTS), MPa 500
710
Tensile Strength: Yield (Proof), MPa 230
490

Thermal Properties

Latent Heat of Fusion, J/g 260
260
Maximum Temperature: Mechanical, °C 480
590
Melting Completion (Liquidus), °C 1470
1490
Melting Onset (Solidus), °C 1430
1450
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 41
26
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
9.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
10

Otherwise Unclassified Properties

Base Metal Price, % relative 4.1
11
Density, g/cm3 7.9
7.9
Embodied Carbon, kg CO2/kg material 1.8
2.8
Embodied Energy, MJ/kg 23
40
Embodied Water, L/kg 62
89

Common Calculations

PREN (Pitting Resistance) 6.4
14
Resilience: Ultimate (Unit Rupture Work), MJ/m3 84
120
Resilience: Unit (Modulus of Resilience), kJ/m3 140
620
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 18
25
Strength to Weight: Bending, points 18
22
Thermal Diffusivity, mm2/s 11
6.9
Thermal Shock Resistance, points 14
19

Alloy Composition

Aluminum (Al), % 0
0 to 0.020
Boron (B), % 0
0.0010 to 0.0060
Carbon (C), % 0 to 0.1
0.070 to 0.13
Chromium (Cr), % 2.8 to 3.3
8.5 to 9.5
Iron (Fe), % 94.4 to 96.1
85.8 to 89.1
Manganese (Mn), % 0.3 to 0.6
0.3 to 0.6
Molybdenum (Mo), % 0.9 to 1.1
0.3 to 0.6
Nickel (Ni), % 0
0 to 0.4
Niobium (Nb), % 0
0.040 to 0.090
Nitrogen (N), % 0
0.030 to 0.070
Phosphorus (P), % 0 to 0.025
0 to 0.020
Silicon (Si), % 0 to 0.5
0 to 0.5
Sulfur (S), % 0 to 0.025
0 to 0.010
Titanium (Ti), % 0
0 to 0.010
Tungsten (W), % 0
1.5 to 2.0
Vanadium (V), % 0
0.15 to 0.25
Zirconium (Zr), % 0
0 to 0.010