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EN 1.4958 Stainless Steel vs. EN 1.4318 Stainless Steel

Both EN 1.4958 stainless steel and EN 1.4318 stainless steel are iron alloys. Both are furnished in the solution annealed (AT) condition. They have 71% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is EN 1.4958 stainless steel and the bottom bar is EN 1.4318 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 40
44
Fatigue Strength, MPa 170
340
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
77
Shear Strength, MPa 430
520
Tensile Strength: Ultimate (UTS), MPa 630
740
Tensile Strength: Yield (Proof), MPa 190
380

Thermal Properties

Latent Heat of Fusion, J/g 300
290
Maximum Temperature: Corrosion, °C 500
410
Maximum Temperature: Mechanical, °C 1090
910
Melting Completion (Liquidus), °C 1400
1430
Melting Onset (Solidus), °C 1350
1380
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 12
15
Thermal Expansion, µm/m-K 15
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.7
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.0
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 30
13
Density, g/cm3 8.0
7.8
Embodied Carbon, kg CO2/kg material 5.3
2.8
Embodied Energy, MJ/kg 75
39
Embodied Water, L/kg 200
130

Common Calculations

PREN (Pitting Resistance) 21
20
Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
280
Resilience: Unit (Modulus of Resilience), kJ/m3 95
360
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 22
27
Strength to Weight: Bending, points 20
23
Thermal Diffusivity, mm2/s 3.2
4.0
Thermal Shock Resistance, points 15
17

Alloy Composition

Aluminum (Al), % 0.2 to 0.5
0
Carbon (C), % 0.030 to 0.080
0 to 0.030
Chromium (Cr), % 19 to 22
16.5 to 18.5
Cobalt (Co), % 0 to 0.5
0
Copper (Cu), % 0 to 0.5
0
Iron (Fe), % 41.1 to 50.6
70.2 to 77.4
Manganese (Mn), % 0 to 1.5
0 to 2.0
Nickel (Ni), % 30 to 32.5
6.0 to 8.0
Niobium (Nb), % 0 to 0.1
0
Nitrogen (N), % 0 to 0.030
0.1 to 0.2
Phosphorus (P), % 0 to 0.015
0 to 0.045
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