MakeItFrom.com
Menu (ESC)

EN 1.4901 (X10CrWMoVNb9-2) Stainless Steel

EN 1.4901 stainless steel is a duplex stainless steel formulated for primary forming into wrought products. Cited properties are appropriate for the normalized and tempered condition. 1.4901 is the EN numeric designation for this material. X10CrWMoVNb9-2 is the EN chemical designation.

It has a fairly low base cost among wrought duplex stainless steels. In addition, it has the highest electrical conductivity and the highest thermal conductivity.

The graph bars on the material properties cards below compare EN 1.4901 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

Elastic (Young's, Tensile) Modulus

190 GPa 28 x 106 psi

Elongation at Break

19 %

Fatigue Strength

310 MPa 45 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)

490 MPa 71 x 103 psi

Thermal Properties

Latent Heat of Fusion

260 J/g

Maximum Temperature: Corrosion

380 °C 720 °F

Maximum Temperature: Mechanical

650 °C 1210 °F

Melting Completion (Liquidus)

1490 °C 2710 °F

Melting Onset (Solidus)

1450 °C 2640 °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

12 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

8.2 % IACS

Electrical Conductivity: Equal Weight (Specific)

9.3 % IACS

Otherwise Unclassified Properties

Base Metal Price

11 % relative

Density

7.9 g/cm3 500 lb/ft3

Embodied Carbon

2.8 kg CO2/kg material

Embodied Energy

40 MJ/kg 17 x 103 BTU/lb

Embodied Water

89 L/kg 11 gal/lb

Common Calculations

PREN (Pitting Resistance)

14

Resilience: Ultimate (Unit Rupture Work)

120 MJ/m3

Resilience: Unit (Modulus of Resilience)

620 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

6.9 mm2/s

Thermal Shock Resistance

23 points

Alloy Composition

Among wrought stainless steels, the composition of EN 1.4901 stainless steel is notable for including zirconium (Zr) and boron (B). Zirconium is used to improve ductility and oxidation resistance. Boron is used to improve hardenability. It has a substantial effect when added in even tiny amounts. It can also facilitate sintering.

Iron (Fe) 85.8 to 89.1
Chromium (Cr) 8.5 to 9.5
Tungsten (W) 1.5 to 2.0
Molybdenum (Mo) 0.3 to 0.6
Manganese (Mn) 0.3 to 0.6
Silicon (Si) 0 to 0.5
Vanadium (V) 0.15 to 0.25
Nickel (Ni) 0 to 0.4
Carbon (C) 0.070 to 0.13
Niobium (Nb) 0.040 to 0.090
Nitrogen (N) 0.030 to 0.070
Phosphorus (P) 0 to 0.020
Aluminum (Al) 0 to 0.020
Sulfur (S) 0 to 0.010
Titanium (Ti) 0 to 0.010
Zirconium (Zr) 0 to 0.010
Boron (B) 0.0010 to 0.0060

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

Pressure Vessels: External Pressure Technology, 2nd ed., Carl T. F. Ross, 2011

Corrosion of Stainless Steels, A. John Sedriks, 1996

Advances in Stainless Steels, Baldev Raj et al. (editors), 2010

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015