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.
| Fe | 56.6 to 63.6 | |
| Cr | 28 to 30 | |
| Ni | 5.8 to 7.5 | |
| Mo | 1.5 to 2.6 | |
| Mn | 0.8 to 1.5 | |
| Cu | 0 to 0.8 | |
| N | 0.3 to 0.4 | |
| Si | 0 to 0.5 | |
| C | 0 to 0.030 | |
| P | 0 to 0.030 | |
| 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