EN 1.4905 (X11CrMoWVNb9-11) Stainless Steel
EN 1.4905 stainless steel is a martensitic stainless steel formulated for primary forming into wrought products. Cited properties are appropriate for the normalized and tempered condition. 1.4905 is the EN numeric designation for this material. X11CrMoWVNb9-11 is the EN chemical designation.
It has a fairly high electrical conductivity among wrought martensitic stainless steels. In addition, it has a moderately high embodied energy and a moderately high ductility.
The graph bars on the material properties cards below compare EN 1.4905 stainless steel to: wrought martensitic 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
190 GPa 28 x 106 psi
Elongation at Break
19 %
Fatigue Strength
330 MPa 47 x 103 psi
Impact Strength: V-Notched Charpy
38 J 28 ft-lb
Poisson's Ratio
0.28
Shear Modulus
76 GPa 11 x 106 psi
Shear Strength
460 MPa 66 x 103 psi
Tensile Strength: Ultimate (UTS)
740 MPa 110 x 103 psi
Tensile Strength: Yield (Proof)
510 MPa 74 x 103 psi
Thermal Properties
Latent Heat of Fusion
270 J/g
Maximum Temperature: Corrosion
380 °C 720 °F
Maximum Temperature: Mechanical
660 °C 1220 °F
Melting Completion (Liquidus)
1480 °C 2690 °F
Melting Onset (Solidus)
1440 °C 2620 °F
Specific Heat Capacity
470 J/kg-K 0.11 BTU/lb-°F
Thermal Conductivity
26 W/m-K 15 BTU/h-ft-°F
Thermal Expansion
11 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
3.7 % IACS
Electrical Conductivity: Equal Weight (Specific)
4.2 % IACS
Otherwise Unclassified Properties
Base Metal Price
9.5 % relative
Density
7.9 g/cm3 490 lb/ft3
Embodied Carbon
2.8 kg CO2/kg material
Embodied Energy
40 MJ/kg 17 x 103 BTU/lb
Embodied Water
90 L/kg 11 gal/lb
Common Calculations
PREN (Pitting Resistance)
15
Resilience: Ultimate (Unit Rupture Work)
130 MJ/m3
Resilience: Unit (Modulus of Resilience)
680 kJ/m3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
26 points
Strength to Weight: Bending
23 points
Thermal Diffusivity
7.0 mm2/s
Thermal Shock Resistance
25 points
Alloy Composition
Among wrought stainless steels, the composition of EN 1.4905 stainless steel is notable for including boron (B) and tungsten (W). Boron is used to improve hardenability. It has a substantial effect when added in even tiny amounts. It can also facilitate sintering. Tungsten interacts with other alloying elements to a greater extent than usual, which makes it hard to broadly characterize its effects.
| Fe | 86.2 to 88.8 | |
| Cr | 8.5 to 9.5 | |
| Mo | 0.9 to 1.1 | |
| W | 0.9 to 1.1 | |
| Mn | 0.3 to 0.6 | |
| Si | 0.1 to 0.5 | |
| Ni | 0.1 to 0.4 | |
| V | 0.18 to 0.25 | |
| C | 0.090 to 0.13 | |
| Nb | 0.060 to 0.1 | |
| N | 0.050 to 0.090 | |
| Al | 0 to 0.040 | |
| P | 0 to 0.020 | |
| S | 0 to 0.010 | |
| B | 0.00050 to 0.0050 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
EN 10216-2: Seamless steel tubes for pressure purposes - Technical delivery conditions - Part 2: Non-alloy and alloy steel tubes with specified elevated temperature properties
EN 10302: Creep resisting steels, nickel and cobalt alloys
Creep-Resistant Steels, Fujio Abe et al. (editors), 2008
EN 10088-1: Stainless steels - Part 1: List of stainless steels
Welding Metallurgy of Stainless Steels, Erich Folkhard et al., 2012
Properties and Selection: Irons, Steels and High Performance Alloys, ASM Handbook vol. 1, ASM International, 1993
Corrosion of Stainless Steels, A. John Sedriks, 1996
Advances in Stainless Steels, Baldev Raj et al. (editors), 2010