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EN 1.6958 Steel vs. AISI 440B Stainless Steel

Both EN 1.6958 steel and AISI 440B stainless 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 EN 1.6958 steel and the bottom bar is AISI 440B stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 16
3.0 to 18
Fatigue Strength, MPa 700
260 to 850
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
77
Shear Strength, MPa 700
460 to 1110
Tensile Strength: Ultimate (UTS), MPa 1140
740 to 1930
Tensile Strength: Yield (Proof), MPa 1070
430 to 1860

Thermal Properties

Latent Heat of Fusion, J/g 250
280
Maximum Temperature: Mechanical, °C 450
870
Melting Completion (Liquidus), °C 1460
1480
Melting Onset (Solidus), °C 1420
1370
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 47
23
Thermal Expansion, µm/m-K 11
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.9
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 5.0
9.0
Density, g/cm3 7.9
7.7
Embodied Carbon, kg CO2/kg material 2.0
2.2
Embodied Energy, MJ/kg 27
31
Embodied Water, L/kg 60
120

Common Calculations

PREN (Pitting Resistance) 2.9
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
57 to 110
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 40
27 to 70
Strength to Weight: Bending, points 31
24 to 45
Thermal Diffusivity, mm2/s 13
6.1
Thermal Shock Resistance, points 39
27 to 70

Alloy Composition

Aluminum (Al), % 0.0050 to 0.050
0
Carbon (C), % 0.25 to 0.3
0.75 to 1.0
Chromium (Cr), % 1.2 to 1.7
16 to 18
Iron (Fe), % 92.6 to 94.5
78.2 to 83.3
Manganese (Mn), % 0.2 to 0.5
0 to 1.0
Molybdenum (Mo), % 0.35 to 0.55
0 to 0.75
Nickel (Ni), % 3.3 to 3.8
0
Phosphorus (P), % 0 to 0.020
0 to 0.040
Silicon (Si), % 0.15 to 0.3
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.015
Vanadium (V), % 0 to 0.12
0