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EN 1.4640 Stainless Steel vs. EN 1.4938 Stainless Steel

Both EN 1.4640 stainless steel and EN 1.4938 stainless steel are iron alloys. They have 86% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is EN 1.4640 stainless steel and the bottom bar is EN 1.4938 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 51
16 to 17
Fatigue Strength, MPa 230 to 250
390 to 520
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
76
Shear Strength, MPa 440 to 460
540 to 630
Tensile Strength: Ultimate (UTS), MPa 620 to 650
870 to 1030
Tensile Strength: Yield (Proof), MPa 240 to 260
640 to 870

Thermal Properties

Latent Heat of Fusion, J/g 280
270
Maximum Temperature: Corrosion, °C 420
390
Maximum Temperature: Mechanical, °C 930
750
Melting Completion (Liquidus), °C 1420
1460
Melting Onset (Solidus), °C 1380
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 15
30
Thermal Expansion, µm/m-K 16
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 14
10
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.8
3.3
Embodied Energy, MJ/kg 40
47
Embodied Water, L/kg 150
110

Common Calculations

PREN (Pitting Resistance) 20
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 250 to 260
140 to 160
Resilience: Unit (Modulus of Resilience), kJ/m3 150 to 170
1050 to 1920
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 22 to 23
31 to 37
Strength to Weight: Bending, points 21
26 to 29
Thermal Diffusivity, mm2/s 4.0
8.1
Thermal Shock Resistance, points 14 to 15
30 to 35

Alloy Composition

Carbon (C), % 0.030 to 0.080
0.080 to 0.15
Chromium (Cr), % 18 to 19
11 to 12.5
Copper (Cu), % 1.3 to 2.0
0
Iron (Fe), % 67.4 to 73.6
80.5 to 84.8
Manganese (Mn), % 1.5 to 4.0
0.4 to 0.9
Molybdenum (Mo), % 0
1.5 to 2.0
Nickel (Ni), % 5.5 to 6.9
2.0 to 3.0
Nitrogen (N), % 0.030 to 0.11
0.020 to 0.040
Phosphorus (P), % 0 to 0.045
0 to 0.025
Silicon (Si), % 0 to 0.5
0 to 0.5
Sulfur (S), % 0 to 0.015
0 to 0.015
Vanadium (V), % 0
0.25 to 0.4