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EN 1.4031 (X39Cr13) Stainless Steel

EN 1.4031 stainless steel is a martensitic stainless steel formulated for primary forming into wrought products. 1.4031 is the EN numeric designation for this material. X39Cr13 is the EN chemical designation.

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

The properties of EN 1.4031 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 1.4031 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

11 to 13 %

Fatigue Strength

220 to 400 MPa 32 to 58 x 103 psi

Poisson's Ratio

0.28

Shear Modulus

76 GPa 11 x 106 psi

Shear Strength

400 to 540 MPa 58 to 78 x 103 psi

Tensile Strength: Ultimate (UTS)

670 to 900 MPa 96 to 130 x 103 psi

Tensile Strength: Yield (Proof)

390 to 730 MPa 56 to 110 x 103 psi

Thermal Properties

Latent Heat of Fusion

280 J/g

Maximum Temperature: Corrosion

390 °C 730 °F

Maximum Temperature: Mechanical

770 °C 1420 °F

Melting Completion (Liquidus)

1440 °C 2620 °F

Melting Onset (Solidus)

1400 °C 2540 °F

Specific Heat Capacity

480 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

30 W/m-K 17 BTU/h-ft-°F

Thermal Expansion

11 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

3.1 % IACS

Electrical Conductivity: Equal Weight (Specific)

3.7 % IACS

Otherwise Unclassified Properties

Base Metal Price

7.0 % relative

Density

7.7 g/cm3 480 lb/ft3

Embodied Carbon

1.9 kg CO2/kg material

Embodied Energy

27 MJ/kg 12 x 103 BTU/lb

Embodied Water

100 L/kg 12 gal/lb

Common Calculations

PREN (Pitting Resistance)

14

Resilience: Ultimate (Unit Rupture Work)

77 to 94 MJ/m3

Resilience: Unit (Modulus of Resilience)

380 to 1360 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

24 to 32 points

Strength to Weight: Bending

22 to 27 points

Thermal Diffusivity

8.1 mm2/s

Thermal Shock Resistance

23 to 32 points

Alloy Composition

Among wrought stainless steels, the composition of EN 1.4031 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.

Iron (Fe) 83 to 87.1
Chromium (Cr) 12.5 to 14.5
Manganese (Mn) 0 to 1.0
Silicon (Si) 0 to 1.0
Carbon (C) 0.36 to 0.42
Phosphorus (P) 0 to 0.040
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 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