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AISI 440A Stainless Steel vs. EN 1.8509 Steel

Both AISI 440A stainless steel and EN 1.8509 steel are iron alloys. They have 84% of their average alloy composition in common. There are 30 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 440A stainless steel and the bottom bar is EN 1.8509 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 5.0 to 20
11
Fatigue Strength, MPa 270 to 790
580
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
73
Shear Strength, MPa 450 to 1040
680
Tensile Strength: Ultimate (UTS), MPa 730 to 1790
1130
Tensile Strength: Yield (Proof), MPa 420 to 1650
940

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Maximum Temperature: Mechanical, °C 760
440
Melting Completion (Liquidus), °C 1480
1450
Melting Onset (Solidus), °C 1370
1410
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 23
39
Thermal Expansion, µm/m-K 10
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
7.5
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
2.8
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 2.2
1.6
Embodied Energy, MJ/kg 31
22
Embodied Water, L/kg 120
65

Common Calculations

PREN (Pitting Resistance) 18
2.6
Resilience: Ultimate (Unit Rupture Work), MJ/m3 87 to 120
120
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 26 to 65
40
Strength to Weight: Bending, points 23 to 43
31
Thermal Diffusivity, mm2/s 6.2
10
Thermal Shock Resistance, points 26 to 65
33

Alloy Composition

Aluminum (Al), % 0
0.8 to 1.2
Carbon (C), % 0.6 to 0.75
0.38 to 0.45
Chromium (Cr), % 16 to 18
1.5 to 1.8
Iron (Fe), % 78.4 to 83.4
95.5 to 97.1
Manganese (Mn), % 0 to 1.0
0.4 to 0.7
Molybdenum (Mo), % 0 to 0.75
0.2 to 0.35
Phosphorus (P), % 0 to 0.040
0 to 0.025
Silicon (Si), % 0 to 1.0
0 to 0.4
Sulfur (S), % 0 to 0.015
0 to 0.035