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EN 1.4477 (X2CrNiMoN29-7-2) Stainless Steel

EN 1.4477 stainless steel is a duplex stainless steel formulated for primary forming into wrought products. 1.4477 is the EN numeric designation for this material. X2CrNiMoN29-7-2 is the EN chemical designation.

It can have a fairly high tensile strength among wrought duplex stainless steels. In addition, it has a fairly low thermal conductivity and can have a moderately low ductility.

The properties of EN 1.4477 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 1.4477 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

270

Elastic (Young's, Tensile) Modulus

210 GPa 30 x 106 psi

Elongation at Break

22 to 23 %

Fatigue Strength

420 to 490 MPa 60 to 71 x 103 psi

Impact Strength: V-Notched Charpy

110 J 83 ft-lb

Poisson's Ratio

0.27

Shear Modulus

81 GPa 12 x 106 psi

Shear Strength

550 to 580 MPa 80 to 85 x 103 psi

Tensile Strength: Ultimate (UTS)

880 to 930 MPa 130 x 103 psi

Tensile Strength: Yield (Proof)

620 to 730 MPa 90 to 110 x 103 psi

Thermal Properties

Latent Heat of Fusion

300 J/g

Maximum Temperature: Corrosion

460 °C 870 °F

Maximum Temperature: Mechanical

1100 °C 2010 °F

Melting Completion (Liquidus)

1430 °C 2600 °F

Melting Onset (Solidus)

1380 °C 2520 °F

Specific Heat Capacity

480 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

13 W/m-K 7.5 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

2.2 % IACS

Electrical Conductivity: Equal Weight (Specific)

2.5 % IACS

Otherwise Unclassified Properties

Base Metal Price

20 % relative

Density

7.7 g/cm3 480 lb/ft3

Embodied Carbon

3.7 kg CO2/kg material

Embodied Energy

52 MJ/kg 23 x 103 BTU/lb

Embodied Water

190 L/kg 23 gal/lb

Common Calculations

PREN (Pitting Resistance)

41

Resilience: Ultimate (Unit Rupture Work)

180 to 190 MJ/m3

Resilience: Unit (Modulus of Resilience)

940 to 1290 kJ/m3

Stiffness to Weight: Axial

15 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

31 to 33 points

Strength to Weight: Bending

26 to 27 points

Thermal Diffusivity

3.5 mm2/s

Thermal Shock Resistance

23 to 25 points

Alloy Composition

Among wrought stainless steels, the composition of EN 1.4477 stainless steel is notable for containing comparatively high amounts of chromium (Cr) and manganese (Mn). Chromium is the defining alloying element of stainless steel. Higher chromium content imparts additional corrosion resistance. Manganese is used to improve ductility at elevated temperatures. It also permits a higher nitrogen content than would otherwise be possible.

Iron (Fe) 56.6 to 63.6
Chromium (Cr) 28 to 30
Nickel (Ni) 5.8 to 7.5
Molybdenum (Mo) 1.5 to 2.6
Manganese (Mn) 0.8 to 1.5
Copper (Cu) 0 to 0.8
Nitrogen (N) 0.3 to 0.4
Silicon (Si) 0 to 0.5
Carbon (C) 0 to 0.030
Phosphorus (P) 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

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

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