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.
| Fe | 73.8 to 80.5 | |
| Cr | 11 to 13 | |
| Ni | 6.0 to 7.0 | |
| Mo | 2.3 to 2.8 | |
| Mn | 0 to 2.0 | |
| Cu | 0.2 to 0.8 | |
| Si | 0 to 0.5 | |
| P | 0 to 0.040 | |
| C | 0 to 0.020 | |
| N | 0 to 0.020 | |
| 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