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AISI 431 Stainless Steel vs. EN 1.7729 Steel

Both AISI 431 stainless steel and EN 1.7729 steel are iron alloys. They have 83% of their average alloy composition in common. There are 32 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 AISI 431 stainless steel and the bottom bar is EN 1.7729 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 250
270
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 15 to 17
17
Fatigue Strength, MPa 430 to 610
500
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
73
Shear Strength, MPa 550 to 840
560
Tensile Strength: Ultimate (UTS), MPa 890 to 1380
910
Tensile Strength: Yield (Proof), MPa 710 to 1040
750

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Maximum Temperature: Mechanical, °C 850
430
Melting Completion (Liquidus), °C 1510
1470
Melting Onset (Solidus), °C 1450
1430
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 26
40
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.6
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 3.0
8.7

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
3.8
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 2.2
3.3
Embodied Energy, MJ/kg 31
49
Embodied Water, L/kg 120
59

Common Calculations

PREN (Pitting Resistance) 16
4.4
Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 180
150
Resilience: Unit (Modulus of Resilience), kJ/m3 1270 to 2770
1500
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 32 to 50
32
Strength to Weight: Bending, points 27 to 36
27
Thermal Diffusivity, mm2/s 7.0
11
Thermal Shock Resistance, points 28 to 43
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 0.2
0.17 to 0.23
Chromium (Cr), % 15 to 17
0.9 to 1.2
Copper (Cu), % 0
0 to 0.2
Iron (Fe), % 78.2 to 83.8
94.8 to 97
Manganese (Mn), % 0 to 1.0
0.35 to 0.75
Molybdenum (Mo), % 0
0.9 to 1.1
Nickel (Ni), % 1.3 to 2.5
0 to 0.2
Phosphorus (P), % 0 to 0.040
0 to 0.020
Silicon (Si), % 0 to 1.0
0 to 0.4
Sulfur (S), % 0 to 0.030
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