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EN 1.7729 Steel vs. EN 1.4122 Stainless Steel

Both EN 1.7729 steel and EN 1.4122 stainless steel are iron alloys. They have 83% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is EN 1.7729 steel and the bottom bar is EN 1.4122 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 17
14
Fatigue Strength, MPa 500
260 to 360
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
77
Shear Strength, MPa 560
480 to 520
Tensile Strength: Ultimate (UTS), MPa 910
790 to 850
Tensile Strength: Yield (Proof), MPa 750
450 to 630

Thermal Properties

Latent Heat of Fusion, J/g 250
280
Maximum Temperature: Mechanical, °C 430
870
Melting Completion (Liquidus), °C 1470
1440
Melting Onset (Solidus), °C 1430
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 40
15
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.7
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 3.8
9.5
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 3.3
2.4
Embodied Energy, MJ/kg 49
33
Embodied Water, L/kg 59
120

Common Calculations

PREN (Pitting Resistance) 4.4
20
Resilience: Ultimate (Unit Rupture Work), MJ/m3 150
93 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 1500
520 to 1000
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 32
28 to 31
Strength to Weight: Bending, points 27
25 to 26
Thermal Diffusivity, mm2/s 11
4.0
Thermal Shock Resistance, points 27
28 to 30

Alloy Composition

Aluminum (Al), % 0.015 to 0.080
0
Arsenic (As), % 0 to 0.020
0
Boron (B), % 0.0010 to 0.010
0
Carbon (C), % 0.17 to 0.23
0.33 to 0.45
Chromium (Cr), % 0.9 to 1.2
15.5 to 17.5
Copper (Cu), % 0 to 0.2
0
Iron (Fe), % 94.8 to 97
77.2 to 83.4
Manganese (Mn), % 0.35 to 0.75
0 to 1.5
Molybdenum (Mo), % 0.9 to 1.1
0.8 to 1.3
Nickel (Ni), % 0 to 0.2
0 to 1.0
Phosphorus (P), % 0 to 0.020
0 to 0.040
Silicon (Si), % 0 to 0.4
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.015
Tin (Sn), % 0 to 0.020
0
Titanium (Ti), % 0.070 to 0.15
0
Vanadium (V), % 0.6 to 0.8
0