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EN 1.4729 (GX40CrSi13) Cast Stainless Steel

EN 1.4729 stainless steel is a ferritic stainless steel formulated for casting. Cited properties are appropriate for the annealed condition. 1.4729 is the EN numeric designation for this material. GX40CrSi13 is the EN chemical designation.

The graph bars on the material properties cards below compare EN 1.4729 stainless steel to: cast 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

260

Elastic (Young's, Tensile) Modulus

190 GPa 28 x 106 psi

Elongation at Break

15 %

Poisson's Ratio

0.28

Shear Modulus

75 GPa 11 x 106 psi

Thermal Properties

Latent Heat of Fusion

300 J/g

Maximum Temperature: Corrosion

390 °C 730 °F

Maximum Temperature: Mechanical

850 °C 1560 °F

Melting Completion (Liquidus)

1420 °C 2590 °F

Melting Onset (Solidus)

1380 °C 2520 °F

Specific Heat Capacity

490 J/kg-K 0.12 BTU/lb-°F

Thermal Conductivity

24 W/m-K 14 BTU/h-ft-°F

Thermal Expansion

10 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

2.8 % IACS

Electrical Conductivity: Equal Weight (Specific)

3.3 % IACS

Otherwise Unclassified Properties

Base Metal Price

7.5 % relative

Density

7.6 g/cm3 480 lb/ft3

Embodied Carbon

2.1 kg CO2/kg material

Embodied Energy

29 MJ/kg 13 x 103 BTU/lb

Embodied Water

100 L/kg 12 gal/lb

Common Calculations

PREN (Pitting Resistance)

14

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Thermal Diffusivity

6.5 mm2/s

Alloy Composition

Among cast stainless steels, the composition of EN 1.4729 stainless steel is notable for containing a comparatively high amount of silicon (Si). Silicon content is typically governed by metallurgical processing concerns, but it can also be added for the purpose of improving oxidation resistance.

Iron (Fe) 80.4 to 86.7
Chromium (Cr) 12 to 14
Silicon (Si) 1.0 to 2.5
Manganese (Mn) 0 to 1.0
Nickel (Ni) 0 to 1.0
Carbon (C) 0.3 to 0.5
Molybdenum (Mo) 0 to 0.5
Phosphorus (P) 0 to 0.040
Sulfur (S) 0 to 0.030

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

EN 10295: Heat Resistant Steel Castings

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

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

Corrosion of Stainless Steels, A. John Sedriks, 1996

Advances in Stainless Steels, Baldev Raj et al. (editors), 2010