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EN 1.4658 (X2CrNiMoCoN28-8-5-1) Stainless Steel

EN 1.4658 stainless steel is a duplex stainless steel formulated for primary forming into wrought products. Cited properties are appropriate for the solution annealed (AT) condition. 1.4658 is the EN numeric designation for this material. X2CrNiMoCoN28-8-5-1 is the EN chemical designation.

It has a fairly high base cost among wrought duplex stainless steels. In addition, it has a moderately high thermal conductivity and a fairly high embodied energy.

The graph bars on the material properties cards below compare EN 1.4658 stainless steel to: wrought duplex 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

Brinell Hardness

260

Elastic (Young's, Tensile) Modulus

210 GPa 30 x 106 psi

Elongation at Break

28 %

Fatigue Strength

530 MPa 77 x 103 psi

Impact Strength: V-Notched Charpy

110 J 84 ft-lb

Poisson's Ratio

0.27

Shear Modulus

81 GPa 12 x 106 psi

Shear Strength

580 MPa 85 x 103 psi

Tensile Strength: Ultimate (UTS)

900 MPa 130 x 103 psi

Tensile Strength: Yield (Proof)

730 MPa 110 x 103 psi

Thermal Properties

Latent Heat of Fusion

300 J/g

Maximum Temperature: Corrosion

460 °C 860 °F

Maximum Temperature: Mechanical

1100 °C 2010 °F

Melting Completion (Liquidus)

1450 °C 2640 °F

Melting Onset (Solidus)

1400 °C 2550 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

16 W/m-K 9.3 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Otherwise Unclassified Properties

Base Metal Price

25 % relative

Density

7.8 g/cm3 490 lb/ft3

Embodied Carbon

4.5 kg CO2/kg material

Embodied Energy

61 MJ/kg 26 x 103 BTU/lb

Embodied Water

200 L/kg 24 gal/lb

Common Calculations

PREN (Pitting Resistance)

49

Resilience: Ultimate (Unit Rupture Work)

240 MJ/m3

Resilience: Unit (Modulus of Resilience)

1280 kJ/m3

Stiffness to Weight: Axial

15 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

32 points

Strength to Weight: Bending

26 points

Thermal Diffusivity

4.3 mm2/s

Thermal Shock Resistance

24 points

Alloy Composition

Among wrought stainless steels, the composition of EN 1.4658 stainless steel is notable for including cobalt (Co) and containing a comparatively high amount of chromium (Cr). Cobalt is used to improve mechanical strength at elevated temperatures. Chromium is the defining alloying element of stainless steel. Higher chromium content imparts additional corrosion resistance.

Iron (Fe) 50.9 to 63.7
Chromium (Cr) 26 to 29
Nickel (Ni) 5.5 to 9.5
Molybdenum (Mo) 4.0 to 5.0
Cobalt (Co) 0.5 to 2.0
Manganese (Mn) 0 to 1.5
Copper (Cu) 0 to 1.0
Nitrogen (N) 0.3 to 0.5
Silicon (Si) 0 to 0.5
Phosphorus (P) 0 to 0.035
Carbon (C) 0 to 0.030
Sulfur (S) 0 to 0.010

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

Followup Questions

Similar Alloys

Further Reading

Duplex Stainless Steels, Iris Alvarez-Armas and Suzanne Degallaix-Moreuil (editors), 2009

Duplex Stainless Steels: Microstructure, Properties and Applications, Robert N. Gunn (editor), 1997

EN 10088-3: Stainless steels - Part 3: Technical delivery conditions for semi-finished products, bars, rods, wire, sections and bright products 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