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EN 1.4958 Stainless Steel vs. EN 1.4122 Stainless Steel

Both EN 1.4958 stainless steel and EN 1.4122 stainless steel are iron alloys. They have 64% of their average alloy composition in common.

For each property being compared, the top bar is EN 1.4958 stainless steel and the bottom bar is EN 1.4122 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 40
14
Fatigue Strength, MPa 170
260 to 360
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
77
Shear Strength, MPa 430
480 to 520
Tensile Strength: Ultimate (UTS), MPa 630
790 to 850
Tensile Strength: Yield (Proof), MPa 190
450 to 630

Thermal Properties

Latent Heat of Fusion, J/g 300
280
Maximum Temperature: Corrosion, °C 500
400
Maximum Temperature: Mechanical, °C 1090
870
Melting Completion (Liquidus), °C 1400
1440
Melting Onset (Solidus), °C 1350
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 12
15
Thermal Expansion, µm/m-K 15
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.7
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.0
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 30
9.5
Density, g/cm3 8.0
7.7
Embodied Carbon, kg CO2/kg material 5.3
2.4
Embodied Energy, MJ/kg 75
33
Embodied Water, L/kg 200
120

Common Calculations

PREN (Pitting Resistance) 21
20
Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
93 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 95
520 to 1000
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 22
28 to 31
Strength to Weight: Bending, points 20
25 to 26
Thermal Diffusivity, mm2/s 3.2
4.0
Thermal Shock Resistance, points 15
28 to 30

Alloy Composition

Aluminum (Al), % 0.2 to 0.5
0
Carbon (C), % 0.030 to 0.080
0.33 to 0.45
Chromium (Cr), % 19 to 22
15.5 to 17.5
Cobalt (Co), % 0 to 0.5
0
Copper (Cu), % 0 to 0.5
0
Iron (Fe), % 41.1 to 50.6
77.2 to 83.4
Manganese (Mn), % 0 to 1.5
0 to 1.5
Molybdenum (Mo), % 0
0.8 to 1.3
Nickel (Ni), % 30 to 32.5
0 to 1.0
Niobium (Nb), % 0 to 0.1
0
Nitrogen (N), % 0 to 0.030
0
Phosphorus (P), % 0 to 0.015
0 to 0.040
Silicon (Si), % 0 to 0.7
0 to 1.0
Sulfur (S), % 0 to 0.010
0 to 0.015
Titanium (Ti), % 0.2 to 0.5
0