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EN 1.4729 Stainless Steel vs. EN 1.4938 Stainless Steel

Both EN 1.4729 stainless steel and EN 1.4938 stainless steel are iron alloys. They have a very high 96% of their average alloy composition in common. There are 23 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 1.4729 stainless steel and the bottom bar is EN 1.4938 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 15
16 to 17
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
76

Thermal Properties

Latent Heat of Fusion, J/g 300
270
Maximum Temperature: Corrosion, °C 390
390
Maximum Temperature: Mechanical, °C 850
750
Melting Completion (Liquidus), °C 1420
1460
Melting Onset (Solidus), °C 1380
1420
Specific Heat Capacity, J/kg-K 490
470
Thermal Conductivity, W/m-K 24
30
Thermal Expansion, µm/m-K 10
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.8
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 3.3
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 7.5
10
Density, g/cm3 7.6
7.8
Embodied Carbon, kg CO2/kg material 2.1
3.3
Embodied Energy, MJ/kg 29
47
Embodied Water, L/kg 100
110

Common Calculations

PREN (Pitting Resistance) 14
18
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Thermal Diffusivity, mm2/s 6.5
8.1

Alloy Composition

Carbon (C), % 0.3 to 0.5
0.080 to 0.15
Chromium (Cr), % 12 to 14
11 to 12.5
Iron (Fe), % 80.4 to 86.7
80.5 to 84.8
Manganese (Mn), % 0 to 1.0
0.4 to 0.9
Molybdenum (Mo), % 0 to 0.5
1.5 to 2.0
Nickel (Ni), % 0 to 1.0
2.0 to 3.0
Nitrogen (N), % 0
0.020 to 0.040
Phosphorus (P), % 0 to 0.040
0 to 0.025
Silicon (Si), % 1.0 to 2.5
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.015
Vanadium (V), % 0
0.25 to 0.4