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EN 1.7003 Steel vs. EN 1.7321 Steel

Both EN 1.7003 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 1.7003 steel and the bottom bar is EN 1.7321 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150 to 200
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 520 to 1780
490 to 1460

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 410
410
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 46
45
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.1
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.2
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 2.0
2.5
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.4
1.5
Embodied Energy, MJ/kg 19
20
Embodied Water, L/kg 48
50

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 18 to 63
17 to 52
Strength to Weight: Bending, points 18 to 42
18 to 36
Thermal Diffusivity, mm2/s 12
12
Thermal Shock Resistance, points 15 to 53
14 to 43

Alloy Composition

Carbon (C), % 0.35 to 0.42
0.17 to 0.23
Chromium (Cr), % 0.4 to 0.6
0.3 to 0.6
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 97.7 to 98.8
97.1 to 98.4
Manganese (Mn), % 0.5 to 0.8
0.7 to 1.0
Molybdenum (Mo), % 0
0.4 to 0.5
Phosphorus (P), % 0 to 0.035
0 to 0.025
Silicon (Si), % 0 to 0.4
0 to 0.3
Sulfur (S), % 0 to 0.035
0 to 0.025

Comparable Variants