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EN 1.4742 (X10CrAlSi18) Stainless Steel

EN 1.4742 stainless steel is a ferritic stainless steel formulated for primary forming into wrought products. Cited properties are appropriate for the annealed condition. 1.4742 is the EN numeric designation for this material. X10CrAlSi18 is the EN chemical designation.

It has a fairly low electrical conductivity among wrought ferritic stainless steels. In addition, it has a fairly low ductility and a moderately high tensile strength.

The graph bars on the material properties cards below compare EN 1.4742 stainless steel to: wrought ferritic 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

180

Elastic (Young's, Tensile) Modulus

200 GPa 28 x 106 psi

Elongation at Break

17 %

Fatigue Strength

180 MPa 27 x 103 psi

Poisson's Ratio

0.28

Shear Modulus

77 GPa 11 x 106 psi

Shear Strength

370 MPa 54 x 103 psi

Tensile Strength: Ultimate (UTS)

600 MPa 87 x 103 psi

Tensile Strength: Yield (Proof)

300 MPa 44 x 103 psi

Thermal Properties

Latent Heat of Fusion

290 J/g

Maximum Temperature: Corrosion

410 °C 780 °F

Maximum Temperature: Mechanical

1000 °C 1830 °F

Melting Completion (Liquidus)

1420 °C 2590 °F

Melting Onset (Solidus)

1380 °C 2510 °F

Specific Heat Capacity

490 J/kg-K 0.12 BTU/lb-°F

Thermal Conductivity

19 W/m-K 11 BTU/h-ft-°F

Thermal Expansion

11 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

1.9 % IACS

Electrical Conductivity: Equal Weight (Specific)

2.2 % IACS

Otherwise Unclassified Properties

Base Metal Price

9.0 % relative

Density

7.6 g/cm3 480 lb/ft3

Embodied Carbon

2.2 kg CO2/kg material

Embodied Energy

32 MJ/kg 14 x 103 BTU/lb

Embodied Water

130 L/kg 16 gal/lb

Common Calculations

PREN (Pitting Resistance)

18

Resilience: Ultimate (Unit Rupture Work)

84 MJ/m3

Resilience: Unit (Modulus of Resilience)

230 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

22 points

Strength to Weight: Bending

21 points

Thermal Diffusivity

5.1 mm2/s

Thermal Shock Resistance

21 points

Alloy Composition

Among wrought stainless steels, the composition of EN 1.4742 stainless steel is notable for containing a comparatively high amount of silicon (Si) and including aluminum (Al). Silicon content is typically governed by metallurgical processing concerns, but it can also be added for the purpose of improving oxidation resistance. Aluminum is used to improve oxidation resistance. It can also enhance the effects of heat treatment.

Iron (Fe) 77.2 to 81.6
Chromium (Cr) 17 to 19
Silicon (Si) 0.7 to 1.4
Aluminum (Al) 0.7 to 1.2
Manganese (Mn) 0 to 1.0
Carbon (C) 0 to 0.12
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 10095: Heat resisting steels and nickel alloys

Creep-Resistant Steels, Fujio Abe et al. (editors), 2008

Welding Metallurgy and Weldability of Stainless Steels, John C. Lippold and Damian J. Kotecki, 2005

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