EN 1.4568 (X7CrNiAl17-7) Stainless Steel
EN 1.4568 stainless steel is a precipitation-hardening stainless steel formulated for primary forming into wrought products. 1.4568 is the EN numeric designation for this material. X7CrNiAl17-7 is the EN chemical designation.
The properties of EN 1.4568 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 1.4568 stainless steel to: wrought precipitation-hardening 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 28 x 106 psi
Elongation at Break
2.3 to 21 %
Fatigue Strength
220 to 670 MPa 32 to 97 x 103 psi
Poisson's Ratio
0.28
Shear Modulus
76 GPa 11 x 106 psi
Shear Strength
520 to 930 MPa 76 to 130 x 103 psi
Tensile Strength: Ultimate (UTS)
830 to 1620 MPa 120 to 240 x 103 psi
Tensile Strength: Yield (Proof)
330 to 1490 MPa 49 to 220 x 103 psi
Thermal Properties
Latent Heat of Fusion
280 J/g
Maximum Temperature: Corrosion
410 °C 770 °F
Maximum Temperature: Mechanical
890 °C 1640 °F
Melting Completion (Liquidus)
1420 °C 2600 °F
Melting Onset (Solidus)
1380 °C 2520 °F
Specific Heat Capacity
480 J/kg-K 0.12 BTU/lb-°F
Thermal Conductivity
16 W/m-K 9.3 BTU/h-ft-°F
Thermal Expansion
13 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
2.2 % IACS
Electrical Conductivity: Equal Weight (Specific)
2.5 % IACS
Otherwise Unclassified Properties
Base Metal Price
13 % relative
Density
7.7 g/cm3 480 lb/ft3
Embodied Carbon
2.8 kg CO2/kg material
Embodied Energy
40 MJ/kg 17 x 103 BTU/lb
Embodied Water
140 L/kg 17 gal/lb
Common Calculations
PREN (Pitting Resistance)
17
Resilience: Ultimate (Unit Rupture Work)
36 to 140 MJ/m3
Resilience: Unit (Modulus of Resilience)
290 to 5710 kJ/m3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
25 points
Strength to Weight: Axial
30 to 58 points
Strength to Weight: Bending
25 to 40 points
Thermal Diffusivity
4.3 mm2/s
Thermal Shock Resistance
23 to 46 points
Alloy Composition
Among wrought stainless steels, the composition of EN 1.4568 stainless steel is notable for including aluminum (Al). Aluminum is used to improve oxidation resistance. It can also enhance the effects of heat treatment.
| Fe | 70.9 to 76.8 | |
| Cr | 16 to 18 | |
| Ni | 6.5 to 7.8 | |
| Al | 0.7 to 1.5 | |
| Mn | 0 to 1.0 | |
| Si | 0 to 0.7 | |
| C | 0 to 0.090 | |
| P | 0 to 0.040 | |
| 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
CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015