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EN 1.4021 Stainless Steel vs. EN 1.4938 Stainless Steel

Both EN 1.4021 stainless steel and EN 1.4938 stainless steel are iron alloys. They have a very high 95% of their average alloy composition in common.

For each property being compared, the top bar is EN 1.4021 stainless steel and the bottom bar is EN 1.4938 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 11 to 17
16 to 17
Fatigue Strength, MPa 240 to 380
390 to 520
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
76
Shear Strength, MPa 390 to 530
540 to 630
Tensile Strength: Ultimate (UTS), MPa 630 to 880
870 to 1030
Tensile Strength: Yield (Proof), MPa 390 to 670
640 to 870

Thermal Properties

Latent Heat of Fusion, J/g 270
270
Maximum Temperature: Corrosion, °C 390
390
Maximum Temperature: Mechanical, °C 760
750
Melting Completion (Liquidus), °C 1440
1460
Melting Onset (Solidus), °C 1400
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 30
30
Thermal Expansion, µm/m-K 11
11

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
10
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 1.9
3.3
Embodied Energy, MJ/kg 27
47
Embodied Water, L/kg 100
110

Common Calculations

PREN (Pitting Resistance) 13
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 88 to 110
140 to 160
Resilience: Unit (Modulus of Resilience), kJ/m3 400 to 1160
1050 to 1920
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 23 to 31
31 to 37
Strength to Weight: Bending, points 21 to 26
26 to 29
Thermal Diffusivity, mm2/s 8.1
8.1
Thermal Shock Resistance, points 22 to 31
30 to 35

Alloy Composition

Carbon (C), % 0.16 to 0.25
0.080 to 0.15
Chromium (Cr), % 12 to 14
11 to 12.5
Iron (Fe), % 83.2 to 87.8
80.5 to 84.8
Manganese (Mn), % 0 to 1.5
0.4 to 0.9
Molybdenum (Mo), % 0
1.5 to 2.0
Nickel (Ni), % 0
2.0 to 3.0
Nitrogen (N), % 0
0.020 to 0.040
Phosphorus (P), % 0 to 0.040
0 to 0.025
Silicon (Si), % 0 to 1.0
0 to 0.5
Sulfur (S), % 0 to 0.015
0 to 0.015
Vanadium (V), % 0
0.25 to 0.4

Comparable Variants