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EN 1.4125 Stainless Steel vs. EN 1.4729 Stainless Steel

Both EN 1.4125 stainless steel and EN 1.4729 stainless steel are iron alloys. Both are furnished in the annealed condition. They have a very high 95% of their average alloy composition in common. There are 24 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is EN 1.4125 stainless steel and the bottom bar is EN 1.4729 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 250
260
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 19
15
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
75

Thermal Properties

Latent Heat of Fusion, J/g 280
300
Maximum Temperature: Corrosion, °C 390
390
Maximum Temperature: Mechanical, °C 870
850
Melting Completion (Liquidus), °C 1430
1420
Melting Onset (Solidus), °C 1390
1380
Specific Heat Capacity, J/kg-K 480
490
Thermal Conductivity, W/m-K 15
24
Thermal Expansion, µm/m-K 10
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
2.8
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
7.5
Density, g/cm3 7.7
7.6
Embodied Carbon, kg CO2/kg material 2.3
2.1
Embodied Energy, MJ/kg 32
29
Embodied Water, L/kg 120
100

Common Calculations

PREN (Pitting Resistance) 19
14
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Thermal Diffusivity, mm2/s 4.1
6.5

Alloy Composition

Carbon (C), % 1.0 to 1.2
0.3 to 0.5
Chromium (Cr), % 16 to 18
12 to 14
Iron (Fe), % 78 to 82.7
80.4 to 86.7
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 0.4 to 0.8
0 to 0.5
Nickel (Ni), % 0
0 to 1.0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
1.0 to 2.5
Sulfur (S), % 0 to 0.015
0 to 0.030