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EN 1.7321 Steel vs. EN 1.4903 Stainless Steel

Both EN 1.7321 steel and EN 1.4903 stainless steel are iron alloys. They have a moderately high 91% of their average alloy composition in common. There are 24 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is EN 1.7321 steel and the bottom bar is EN 1.4903 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
75
Tensile Strength: Ultimate (UTS), MPa 490 to 1460
670 to 680

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Maximum Temperature: Mechanical, °C 410
650
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 45
26
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
3.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
4.0

Otherwise Unclassified Properties

Base Metal Price, % relative 2.5
7.0
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.5
2.6
Embodied Energy, MJ/kg 20
36
Embodied Water, L/kg 50
88

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 17 to 52
24
Strength to Weight: Bending, points 18 to 36
22
Thermal Diffusivity, mm2/s 12
7.0
Thermal Shock Resistance, points 14 to 43
23

Alloy Composition

Aluminum (Al), % 0
0 to 0.040
Carbon (C), % 0.17 to 0.23
0.080 to 0.12
Chromium (Cr), % 0.3 to 0.6
8.0 to 9.5
Copper (Cu), % 0 to 0.25
0 to 0.3
Iron (Fe), % 97.1 to 98.4
87.1 to 90.5
Manganese (Mn), % 0.7 to 1.0
0.3 to 0.6
Molybdenum (Mo), % 0.4 to 0.5
0.85 to 1.1
Nickel (Ni), % 0
0 to 0.4
Niobium (Nb), % 0
0.060 to 0.1
Nitrogen (N), % 0
0.030 to 0.070
Phosphorus (P), % 0 to 0.025
0 to 0.025
Silicon (Si), % 0 to 0.3
0 to 0.5
Sulfur (S), % 0 to 0.025
0 to 0.015
Vanadium (V), % 0
0.18 to 0.25