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EN 1.4537 (X1CrNiMoCuN25-25-5) Stainless Steel

EN 1.4537 stainless steel is a superaustenitic (highly alloyed) stainless steel formulated for primary forming into wrought products. Cited properties are appropriate for the solution annealed (AT) condition. 1.4537 is the EN numeric designation for this material. X1CrNiMoCuN25-25-5 is the EN chemical designation.

It has a fairly high thermal conductivity and a moderately high electrical conductivity among wrought superaustenitic stainless steels.

The graph bars on the material properties cards below compare EN 1.4537 stainless steel to: wrought superaustenitic 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

Brinell Hardness

220

Elastic (Young's, Tensile) Modulus

210 GPa 30 x 106 psi

Elongation at Break

42 %

Fatigue Strength

290 MPa 42 x 103 psi

Impact Strength: V-Notched Charpy

91 J 67 ft-lb

Poisson's Ratio

0.28

Shear Modulus

80 GPa 12 x 106 psi

Shear Strength

480 MPa 70 x 103 psi

Tensile Strength: Ultimate (UTS)

700 MPa 100 x 103 psi

Tensile Strength: Yield (Proof)

330 MPa 48 x 103 psi

Thermal Properties

Latent Heat of Fusion

310 J/g

Maximum Temperature: Corrosion

450 °C 840 °F

Maximum Temperature: Mechanical

1100 °C 2010 °F

Melting Completion (Liquidus)

1440 °C 2620 °F

Melting Onset (Solidus)

1390 °C 2530 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

14 W/m-K 8.1 BTU/h-ft-°F

Thermal Expansion

16 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

2.0 % IACS

Electrical Conductivity: Equal Weight (Specific)

2.3 % IACS

Otherwise Unclassified Properties

Base Metal Price

34 % relative

Density

8.1 g/cm3 500 lb/ft3

Embodied Carbon

6.1 kg CO2/kg material

Embodied Energy

84 MJ/kg 36 x 103 BTU/lb

Embodied Water

220 L/kg 27 gal/lb

Common Calculations

PREN (Pitting Resistance)

46

Resilience: Ultimate (Unit Rupture Work)

240 MJ/m3

Resilience: Unit (Modulus of Resilience)

270 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

24 points

Strength to Weight: Bending

22 points

Thermal Diffusivity

3.7 mm2/s

Thermal Shock Resistance

15 points

Alloy Composition

Among wrought stainless steels, the composition of EN 1.4537 stainless steel is notable for containing comparatively high amounts of chromium (Cr) and nickel (Ni). Chromium is the defining alloying element of stainless steel. Higher chromium content imparts additional corrosion resistance. Nickel is primarily used to achieve a specific microstructure. In addition, it has a beneficial effect on mechanical properties and certain types of corrosion.

Iron (Fe) 36.3 to 46.1
Nickel (Ni) 24 to 27
Chromium (Cr) 24 to 26
Molybdenum (Mo) 4.7 to 5.7
Copper (Cu) 1.0 to 2.0
Manganese (Mn) 0 to 2.0
Silicon (Si) 0 to 0.7
Nitrogen (N) 0.17 to 0.25
Phosphorus (P) 0 to 0.030
Carbon (C) 0 to 0.020
Sulfur (S) 0 to 0.010

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

Welding Metallurgy of Stainless Steels, Erich Folkhard et al., 2012

Corrosion of Austenitic Stainless Steels: Mechanism, Mitigation and Monitoring, H. S. Khatak and B. Raj (editors), 2002

Austenitic Stainless Steels: Microstructure and Mechanical Properties, P. Marshall, 1984

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