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AISI 440A Stainless Steel vs. EN 1.7729 Steel

Both AISI 440A stainless steel and EN 1.7729 steel are iron alloys. They have 83% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is AISI 440A stainless steel and the bottom bar is EN 1.7729 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 5.0 to 20
17
Fatigue Strength, MPa 270 to 790
500
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
73
Shear Strength, MPa 450 to 1040
560
Tensile Strength: Ultimate (UTS), MPa 730 to 1790
910
Tensile Strength: Yield (Proof), MPa 420 to 1650
750

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Maximum Temperature: Mechanical, °C 760
430
Melting Completion (Liquidus), °C 1480
1470
Melting Onset (Solidus), °C 1370
1430
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 23
40
Thermal Expansion, µm/m-K 10
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
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) 18
4.4
Resilience: Ultimate (Unit Rupture Work), MJ/m3 87 to 120
150
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 26 to 65
32
Strength to Weight: Bending, points 23 to 43
27
Thermal Diffusivity, mm2/s 6.2
11
Thermal Shock Resistance, points 26 to 65
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), % 0.6 to 0.75
0.17 to 0.23
Chromium (Cr), % 16 to 18
0.9 to 1.2
Copper (Cu), % 0
0 to 0.2
Iron (Fe), % 78.4 to 83.4
94.8 to 97
Manganese (Mn), % 0 to 1.0
0.35 to 0.75
Molybdenum (Mo), % 0 to 0.75
0.9 to 1.1
Nickel (Ni), % 0
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 0.015
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