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EN 1.4903 (X10CrMoVNb9-1) Stainless Steel

EN 1.4903 stainless steel is a martensitic stainless steel formulated for primary forming into wrought products. 1.4903 is the EN numeric designation for this material. X10CrMoVNb9-1 is the EN chemical designation.

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

The properties of EN 1.4903 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 1.4903 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

20 to 21 %

Fatigue Strength

320 to 330 MPa 46 to 48 x 103 psi

Impact Strength: V-Notched Charpy

42 to 46 J 31 to 34 ft-lb

Poisson's Ratio

0.28

Shear Modulus

75 GPa 11 x 106 psi

Shear Strength

420 MPa 61 to 62 x 103 psi

Tensile Strength: Ultimate (UTS)

670 to 680 MPa 98 to 99 x 103 psi

Tensile Strength: Yield (Proof)

500 MPa 72 to 73 x 103 psi

Thermal Properties

Latent Heat of Fusion

270 J/g

Maximum Temperature: Corrosion

380 °C 720 °F

Maximum Temperature: Mechanical

650 °C 1200 °F

Melting Completion (Liquidus)

1460 °C 2660 °F

Melting Onset (Solidus)

1420 °C 2580 °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

3.4 % IACS

Electrical Conductivity: Equal Weight (Specific)

4.0 % IACS

Otherwise Unclassified Properties

Base Metal Price

7.0 % relative

Density

7.8 g/cm3 490 lb/ft3

Embodied Carbon

2.6 kg CO2/kg material

Embodied Energy

36 MJ/kg 16 x 103 BTU/lb

Embodied Water

88 L/kg 11 gal/lb

Common Calculations

PREN (Pitting Resistance)

13

Resilience: Ultimate (Unit Rupture Work)

120 to 130 MJ/m3

Resilience: Unit (Modulus of Resilience)

650 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

24 points

Strength to Weight: Bending

22 points

Thermal Diffusivity

7.0 mm2/s

Thermal Shock Resistance

23 points

Alloy Composition

Among wrought stainless steels, the composition of EN 1.4903 stainless steel is notable for including vanadium (V) and aluminum (Al). Vanadium has a strong hardening effect, but this effect is particularly sensitive to the type of tempering. Aluminum is used to improve oxidation resistance. It can also enhance the effects of heat treatment.

Iron (Fe) 87.1 to 90.5
Chromium (Cr) 8.0 to 9.5
Molybdenum (Mo) 0.85 to 1.1
Manganese (Mn) 0.3 to 0.6
Silicon (Si) 0 to 0.5
Vanadium (V) 0.18 to 0.25
Nickel (Ni) 0 to 0.4
Copper (Cu) 0 to 0.3
Carbon (C) 0.080 to 0.12
Niobium (Nb) 0.060 to 0.1
Nitrogen (N) 0.030 to 0.070
Aluminum (Al) 0 to 0.040
Phosphorus (P) 0 to 0.025
Sulfur (S) 0 to 0.015

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

EN 10222-2: Steel forgings for pressure purposes - Part 2: Ferritic and martensitic steels with specified elevated temperature properties

EN 10028-2: Flat products made of steels for pressure purposes - Part 2: Non-alloy and alloy steels with specified elevated temperature properties

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

Machining of Stainless Steels and Super Alloys: Traditional and Nontraditional Techniques, Helmi A. Youssef, 2016

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

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

Corrosion of Stainless Steels, A. John Sedriks, 1996