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EN 1.4404 Stainless Steel vs. EN 1.7729 Steel

Both EN 1.4404 stainless steel and EN 1.7729 steel are iron alloys. They have 70% of their average alloy composition in common. There are 33 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is EN 1.4404 stainless steel and the bottom bar is EN 1.7729 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190 to 270
270
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 14 to 43
17
Fatigue Strength, MPa 220 to 320
500
Impact Strength: V-Notched Charpy, J 91 to 93
46
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 78
73
Shear Strength, MPa 420 to 550
560
Tensile Strength: Ultimate (UTS), MPa 600 to 900
910
Tensile Strength: Yield (Proof), MPa 240 to 570
750

Thermal Properties

Latent Heat of Fusion, J/g 290
250
Maximum Temperature: Mechanical, °C 950
430
Melting Completion (Liquidus), °C 1440
1470
Melting Onset (Solidus), °C 1400
1430
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 15
40
Thermal Expansion, µm/m-K 16
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.3
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 2.6
8.7

Otherwise Unclassified Properties

Base Metal Price, % relative 19
3.8
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 3.8
3.3
Embodied Energy, MJ/kg 52
49
Embodied Water, L/kg 150
59

Common Calculations

PREN (Pitting Resistance) 26
4.4
Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 210
150
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 800
1500
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 21 to 32
32
Strength to Weight: Bending, points 20 to 26
27
Thermal Diffusivity, mm2/s 4.0
11
Thermal Shock Resistance, points 13 to 20
27

Alloy Composition

Aluminum (Al), % 0
0.015 to 0.080
Arsenic (As), % 0
0 to 0.020
Boron (B), % 0
0.0010 to 0.010
Carbon (C), % 0 to 0.030
0.17 to 0.23
Chromium (Cr), % 16.5 to 18.5
0.9 to 1.2
Copper (Cu), % 0
0 to 0.2
Iron (Fe), % 62.8 to 71.5
94.8 to 97
Manganese (Mn), % 0 to 2.0
0.35 to 0.75
Molybdenum (Mo), % 2.0 to 2.5
0.9 to 1.1
Nickel (Ni), % 10 to 13
0 to 0.2
Nitrogen (N), % 0 to 0.1
0
Phosphorus (P), % 0 to 0.045
0 to 0.020
Silicon (Si), % 0 to 1.0
0 to 0.4
Sulfur (S), % 0 to 0.015
0 to 0.015
Tin (Sn), % 0
0 to 0.020
Titanium (Ti), % 0
0.070 to 0.15
Vanadium (V), % 0
0.6 to 0.8