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EN 1.7729 Steel vs. S31727 Stainless Steel

Both EN 1.7729 steel and S31727 stainless steel are iron alloys. They have 60% of their average alloy composition in common. There are 29 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is EN 1.7729 steel and the bottom bar is S31727 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 270
190
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 17
40
Fatigue Strength, MPa 500
240
Poisson's Ratio 0.29
0.28
Reduction in Area, % 56
56
Shear Modulus, GPa 73
78
Shear Strength, MPa 560
430
Tensile Strength: Ultimate (UTS), MPa 910
630
Tensile Strength: Yield (Proof), MPa 750
270

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Maximum Temperature: Mechanical, °C 430
1010
Melting Completion (Liquidus), °C 1470
1440
Melting Onset (Solidus), °C 1430
1390
Specific Heat Capacity, J/kg-K 470
470
Thermal Expansion, µm/m-K 13
16

Otherwise Unclassified Properties

Base Metal Price, % relative 3.8
24
Density, g/cm3 7.8
8.0
Embodied Carbon, kg CO2/kg material 3.3
4.7
Embodied Energy, MJ/kg 49
64
Embodied Water, L/kg 59
180

Common Calculations

PREN (Pitting Resistance) 4.4
35
Resilience: Ultimate (Unit Rupture Work), MJ/m3 150
200
Resilience: Unit (Modulus of Resilience), kJ/m3 1500
190
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 32
22
Strength to Weight: Bending, points 27
20
Thermal Shock Resistance, points 27
14

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 to 0.030
Chromium (Cr), % 0.9 to 1.2
17.5 to 19
Copper (Cu), % 0 to 0.2
2.8 to 4.0
Iron (Fe), % 94.8 to 97
53.7 to 61.3
Manganese (Mn), % 0.35 to 0.75
0 to 1.0
Molybdenum (Mo), % 0.9 to 1.1
3.8 to 4.5
Nickel (Ni), % 0 to 0.2
14.5 to 16.5
Nitrogen (N), % 0
0.15 to 0.21
Phosphorus (P), % 0 to 0.020
0 to 0.030
Silicon (Si), % 0 to 0.4
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.030
Tin (Sn), % 0 to 0.020
0
Titanium (Ti), % 0.070 to 0.15
0
Vanadium (V), % 0.6 to 0.8
0