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ASTM A203 Steel vs. ASTM A369 Grade FPA

Both ASTM A203 steel and ASTM A369 grade FPA are iron alloys.

For each property being compared, the top bar is ASTM A203 steel and the bottom bar is ASTM A369 grade FPA.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 180
110
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 22 to 26
27
Fatigue Strength, MPa 210 to 280
180
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 330 to 370
240
Tensile Strength: Ultimate (UTS), MPa 520 to 590
380
Tensile Strength: Yield (Proof), MPa 290 to 390
240

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 410
400
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 52
52
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4 to 7.6
7.1
Electrical Conductivity: Equal Weight (Specific), % IACS 8.5 to 8.7
8.1

Otherwise Unclassified Properties

Base Metal Price, % relative 3.2 to 4.0
1.8
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.6 to 1.7
1.4
Embodied Energy, MJ/kg 21 to 23
18
Embodied Water, L/kg 50 to 52
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 120
89
Resilience: Unit (Modulus of Resilience), kJ/m3 230 to 410
150
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 18 to 21
13
Strength to Weight: Bending, points 18 to 20
15
Thermal Diffusivity, mm2/s 14
14
Thermal Shock Resistance, points 15 to 17
12