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EN 1.7239 Steel vs. EN 1.7321 Steel

Both EN 1.7239 steel and EN 1.7321 steel are iron alloys. Their average alloy composition is basically identical.

For each property being compared, the top bar is EN 1.7239 steel and the bottom bar is EN 1.7321 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200 to 480
150 to 170
Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Tensile Strength: Ultimate (UTS), MPa 660 to 1990
490 to 1460

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 420
410
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 44
45
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 2.3
2.5
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.5
1.5
Embodied Energy, MJ/kg 20
20
Embodied Water, L/kg 50
50

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 23 to 71
17 to 52
Strength to Weight: Bending, points 21 to 45
18 to 36
Thermal Diffusivity, mm2/s 12
12
Thermal Shock Resistance, points 19 to 59
14 to 43

Alloy Composition

Carbon (C), % 0.56 to 0.64
0.17 to 0.23
Chromium (Cr), % 0.7 to 1.0
0.3 to 0.6
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 96.8 to 98
97.1 to 98.4
Manganese (Mn), % 0.7 to 1.0
0.7 to 1.0
Molybdenum (Mo), % 0.060 to 0.15
0.4 to 0.5
Phosphorus (P), % 0 to 0.025
0 to 0.025
Silicon (Si), % 0 to 0.4
0 to 0.3
Sulfur (S), % 0 to 0.025
0 to 0.025

Comparable Variants