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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.

Iron (Fe) 86.2 to 88.8
Chromium (Cr) 8.5 to 9.5
Molybdenum (Mo) 0.9 to 1.1
Tungsten (W) 0.9 to 1.1
Manganese (Mn) 0.3 to 0.6
Silicon (Si) 0.1 to 0.5
Nickel (Ni) 0.1 to 0.4
Vanadium (V) 0.18 to 0.25
Carbon (C) 0.090 to 0.13
Niobium (Nb) 0.060 to 0.1
Nitrogen (N) 0.050 to 0.090
Aluminum (Al) 0 to 0.040
Phosphorus (P) 0 to 0.020
Sulfur (S) 0 to 0.010
Boron (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