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EN 1.4640 Stainless Steel vs. EN 1.7729 Steel

Both EN 1.4640 stainless steel and EN 1.7729 steel are iron alloys. They have 73% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is EN 1.4640 stainless steel and the bottom bar is EN 1.7729 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190 to 200
270
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 51
17
Fatigue Strength, MPa 230 to 250
500
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
73
Shear Strength, MPa 440 to 460
560
Tensile Strength: Ultimate (UTS), MPa 620 to 650
910
Tensile Strength: Yield (Proof), MPa 240 to 260
750

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Maximum Temperature: Mechanical, °C 930
430
Melting Completion (Liquidus), °C 1420
1470
Melting Onset (Solidus), °C 1380
1430
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 15
40
Thermal Expansion, µm/m-K 16
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
8.7

Otherwise Unclassified Properties

Base Metal Price, % relative 14
3.8
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.8
3.3
Embodied Energy, MJ/kg 40
49
Embodied Water, L/kg 150
59

Common Calculations

PREN (Pitting Resistance) 20
4.4
Resilience: Ultimate (Unit Rupture Work), MJ/m3 250 to 260
150
Resilience: Unit (Modulus of Resilience), kJ/m3 150 to 170
1500
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 22 to 23
32
Strength to Weight: Bending, points 21
27
Thermal Diffusivity, mm2/s 4.0
11
Thermal Shock Resistance, points 14 to 15
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), % 0.030 to 0.080
0.17 to 0.23
Chromium (Cr), % 18 to 19
0.9 to 1.2
Copper (Cu), % 1.3 to 2.0
0 to 0.2
Iron (Fe), % 67.4 to 73.6
94.8 to 97
Manganese (Mn), % 1.5 to 4.0
0.35 to 0.75
Molybdenum (Mo), % 0
0.9 to 1.1
Nickel (Ni), % 5.5 to 6.9
0 to 0.2
Nitrogen (N), % 0.030 to 0.11
0
Phosphorus (P), % 0 to 0.045
0 to 0.020
Silicon (Si), % 0 to 0.5
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