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EN 1.4423 (X1CrNiMoCu12-7-3) Stainless Steel

EN 1.4423 stainless steel is a martensitic stainless steel formulated for primary forming into wrought products. Cited properties are appropriate for the quenched and tempered condition. 1.4423 is the EN numeric designation for this material. X1CrNiMoCu12-7-3 is the EN chemical designation.

It has a fairly high base cost among wrought martensitic stainless steels. In addition, it has a moderately low electrical conductivity and a moderately low thermal conductivity.

The graph bars on the material properties cards below compare EN 1.4423 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

200 GPa 29 x 106 psi

Elongation at Break

17 %

Fatigue Strength

380 MPa 55 x 103 psi

Impact Strength: V-Notched Charpy

110 J 83 ft-lb

Poisson's Ratio

0.28

Shear Modulus

77 GPa 11 x 106 psi

Shear Strength

520 MPa 76 x 103 psi

Tensile Strength: Ultimate (UTS)

850 MPa 120 x 103 psi

Tensile Strength: Yield (Proof)

630 MPa 91 x 103 psi

Thermal Properties

Latent Heat of Fusion

280 J/g

Maximum Temperature: Corrosion

390 °C 730 °F

Maximum Temperature: Mechanical

780 °C 1440 °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

16 W/m-K 9.3 BTU/h-ft-°F

Thermal Expansion

9.9 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

2.3 % IACS

Electrical Conductivity: Equal Weight (Specific)

2.6 % IACS

Otherwise Unclassified Properties

Base Metal Price

14 % relative

Density

7.9 g/cm3 490 lb/ft3

Embodied Carbon

3.2 kg CO2/kg material

Embodied Energy

43 MJ/kg 18 x 103 BTU/lb

Embodied Water

120 L/kg 14 gal/lb

Common Calculations

PREN (Pitting Resistance)

21

Resilience: Ultimate (Unit Rupture Work)

130 MJ/m3

Resilience: Unit (Modulus of Resilience)

1000 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

30 points

Strength to Weight: Bending

25 points

Thermal Diffusivity

4.3 mm2/s

Thermal Shock Resistance

31 points

Alloy Composition

Among wrought stainless steels, the composition of EN 1.4423 stainless steel is notable for including copper (Cu). Copper is used to improve resistance to acids, and to improve formability.

Iron (Fe) 73.8 to 80.5
Chromium (Cr) 11 to 13
Nickel (Ni) 6.0 to 7.0
Molybdenum (Mo) 2.3 to 2.8
Manganese (Mn) 0 to 2.0
Copper (Cu) 0.2 to 0.8
Silicon (Si) 0 to 0.5
Phosphorus (P) 0 to 0.040
Carbon (C) 0 to 0.020
Nitrogen (N) 0 to 0.020
Sulfur (S) 0 to 0.0030

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 10088-1: Stainless steels - Part 1: List of stainless steels

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

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