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EN 1.4621 Stainless Steel vs. EN 1.4021 Stainless Steel

Both EN 1.4621 stainless steel and EN 1.4021 stainless steel are iron alloys. They have a moderately high 91% of their average alloy composition in common.

For each property being compared, the top bar is EN 1.4621 stainless steel and the bottom bar is EN 1.4021 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 25
11 to 17
Fatigue Strength, MPa 190
240 to 380
Poisson's Ratio 0.27
0.28
Shear Modulus, GPa 78
76
Shear Strength, MPa 320
390 to 530
Tensile Strength: Ultimate (UTS), MPa 500
630 to 880
Tensile Strength: Yield (Proof), MPa 270
390 to 670

Thermal Properties

Latent Heat of Fusion, J/g 290
270
Maximum Temperature: Corrosion, °C 510
390
Maximum Temperature: Mechanical, °C 970
760
Melting Completion (Liquidus), °C 1440
1440
Melting Onset (Solidus), °C 1390
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 21
30
Thermal Expansion, µm/m-K 11
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.6
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 3.1
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 14
7.0
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 2.8
1.9
Embodied Energy, MJ/kg 41
27
Embodied Water, L/kg 140
100

Common Calculations

PREN (Pitting Resistance) 21
13
Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
88 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 190
400 to 1160
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 18
23 to 31
Strength to Weight: Bending, points 18
21 to 26
Thermal Diffusivity, mm2/s 5.7
8.1
Thermal Shock Resistance, points 17
22 to 31

Alloy Composition

Carbon (C), % 0 to 0.030
0.16 to 0.25
Chromium (Cr), % 20 to 21.5
12 to 14
Copper (Cu), % 0.1 to 1.0
0
Iron (Fe), % 74.4 to 79.7
83.2 to 87.8
Manganese (Mn), % 0 to 1.0
0 to 1.5
Niobium (Nb), % 0.2 to 1.0
0
Nitrogen (N), % 0 to 0.030
0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.015