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EN 1.4621 (X2CrNbCu21) Stainless Steel

EN 1.4621 stainless steel is a ferritic stainless steel formulated for primary forming into wrought products. 1.4621 is the EN numeric designation for this material. X2CrNbCu21 is the EN chemical designation.

It has a moderately high ductility among wrought ferritic stainless steels. In addition, it has a moderately high base cost and a moderately high embodied energy.

The properties of EN 1.4621 stainless steel include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare EN 1.4621 stainless steel to: wrought ferritic stainless steels (top), all iron alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Elastic (Young's, Tensile) Modulus

200 GPa 29 x 106 psi

Elongation at Break

25 %

Fatigue Strength

190 MPa 27 x 103 psi

Poisson's Ratio

0.27

Shear Modulus

78 GPa 11 x 106 psi

Shear Strength

320 MPa 46 x 103 psi

Tensile Strength: Ultimate (UTS)

500 MPa 73 x 103 psi

Tensile Strength: Yield (Proof)

270 MPa 39 x 103 psi

Thermal Properties

Latent Heat of Fusion

290 J/g

Maximum Temperature: Corrosion

510 °C 950 °F

Maximum Temperature: Mechanical

970 °C 1780 °F

Melting Completion (Liquidus)

1440 °C 2620 °F

Melting Onset (Solidus)

1390 °C 2540 °F

Specific Heat Capacity

480 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

21 W/m-K 12 BTU/h-ft-°F

Thermal Expansion

11 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

2.6 % IACS

Electrical Conductivity: Equal Weight (Specific)

3.1 % IACS

Otherwise Unclassified Properties

Base Metal Price

14 % relative

Density

7.7 g/cm3 480 lb/ft3

Embodied Carbon

2.8 kg CO2/kg material

Embodied Energy

41 MJ/kg 17 x 103 BTU/lb

Embodied Water

140 L/kg 16 gal/lb

Common Calculations

PREN (Pitting Resistance)

21

Resilience: Ultimate (Unit Rupture Work)

110 MJ/m3

Resilience: Unit (Modulus of Resilience)

190 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

18 points

Strength to Weight: Bending

18 points

Thermal Diffusivity

5.7 mm2/s

Thermal Shock Resistance

17 points

Alloy Composition

Among wrought stainless steels, the composition of EN 1.4621 stainless steel is notable for including niobium (Nb) and copper (Cu). Niobium is primarily used to improve yield strength, particularly at elevated temperatures. Copper is used to improve resistance to acids, and to improve formability.

Iron (Fe) 74.4 to 79.7
Chromium (Cr) 20 to 21.5
Niobium (Nb) 0.2 to 1.0
Copper (Cu) 0.1 to 1.0
Manganese (Mn) 0 to 1.0
Silicon (Si) 0 to 1.0
Phosphorus (P) 0 to 0.040
Carbon (C) 0 to 0.030
Nitrogen (N) 0 to 0.030
Sulfur (S) 0 to 0.015

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

EN 10088-2: Stainless steels - Part 2: Technical delivery conditions for sheet/plate and strip of corrosion resisting steels for general purposes

EN 10088-1: Stainless steels - Part 1: List of stainless steels

Corrosion of Stainless Steels, A. John Sedriks, 1996

Advances in Stainless Steels, Baldev Raj et al. (editors), 2010

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015