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S21904 Stainless Steel vs. EN 1.4938 Stainless Steel

Both S21904 stainless steel and EN 1.4938 stainless steel are iron alloys. They have 79% 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 S21904 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, % 17 to 51
16 to 17
Fatigue Strength, MPa 380 to 550
390 to 520
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 78
76
Shear Strength, MPa 510 to 620
540 to 630
Tensile Strength: Ultimate (UTS), MPa 700 to 1000
870 to 1030
Tensile Strength: Yield (Proof), MPa 390 to 910
640 to 870

Thermal Properties

Latent Heat of Fusion, J/g 290
270
Maximum Temperature: Corrosion, °C 430
390
Maximum Temperature: Mechanical, °C 980
750
Melting Completion (Liquidus), °C 1400
1460
Melting Onset (Solidus), °C 1350
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 14
30
Thermal Expansion, µm/m-K 17
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 15
10
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 3.0
3.3
Embodied Energy, MJ/kg 43
47
Embodied Water, L/kg 160
110

Common Calculations

PREN (Pitting Resistance) 25
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 160 to 310
140 to 160
Resilience: Unit (Modulus of Resilience), kJ/m3 380 to 2070
1050 to 1920
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 25 to 36
31 to 37
Strength to Weight: Bending, points 23 to 29
26 to 29
Thermal Diffusivity, mm2/s 3.8
8.1
Thermal Shock Resistance, points 15 to 21
30 to 35

Alloy Composition

Carbon (C), % 0 to 0.040
0.080 to 0.15
Chromium (Cr), % 19 to 21.5
11 to 12.5
Iron (Fe), % 59.5 to 67.4
80.5 to 84.8
Manganese (Mn), % 8.0 to 10
0.4 to 0.9
Molybdenum (Mo), % 0
1.5 to 2.0
Nickel (Ni), % 5.5 to 7.5
2.0 to 3.0
Nitrogen (N), % 0.15 to 0.4
0.020 to 0.040
Phosphorus (P), % 0 to 0.045
0 to 0.025
Silicon (Si), % 0 to 1.0
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.015
Vanadium (V), % 0
0.25 to 0.4

Comparable Variants