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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.

Iron (Fe) 70.9 to 76.8
Chromium (Cr) 16 to 18
Nickel (Ni) 6.5 to 7.8
Aluminum (Al) 0.7 to 1.5
Manganese (Mn) 0 to 1.0
Silicon (Si) 0 to 0.7
Carbon (C) 0 to 0.090
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

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015