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ASTM Grade HN (20Cr-25Ni, J94213) Cast Stainless Steel

ASTM grade HN steel is an austenitic stainless steel formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. HN is the ASTM designation for this material. J94213 is the UNS number. And 20Cr-25Ni is the common industry name.

It has a moderately low ductility among the cast austenitic stainless steels in the database.

The graph bars on the material properties cards below compare ASTM grade HN steel to: cast austenitic 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

140

Elastic (Young's, Tensile) Modulus

200 GPa 29 x 106 psi

Elongation at Break

9.0 %

Poisson's Ratio

0.28

Shear Modulus

77 GPa 11 x 106 psi

Tensile Strength: Ultimate (UTS)

500 MPa 72 x 103 psi

Thermal Properties

Latent Heat of Fusion

310 J/g

Maximum Temperature: Corrosion

420 °C 790 °F

Maximum Temperature: Mechanical

1080 °C 1970 °F

Melting Completion (Liquidus)

1400 °C 2550 °F

Melting Onset (Solidus)

1350 °C 2460 °F

Specific Heat Capacity

480 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

13 W/m-K 7.7 BTU/h-ft-°F

Thermal Expansion

16 µm/m-K

Otherwise Unclassified Properties

Base Metal Price

26 % relative

Density

7.9 g/cm3 490 lb/ft3

Embodied Carbon

4.6 kg CO2/kg material

Embodied Energy

66 MJ/kg 28 x 103 BTU/lb

Embodied Water

180 L/kg 22 gal/lb

Common Calculations

PREN (Pitting Resistance)

22

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

17 points

Strength to Weight: Bending

18 points

Thermal Diffusivity

3.5 mm2/s

Thermal Shock Resistance

11 points

Alloy Composition

Among cast stainless steels, the composition of ASTM grade HN steel is notable for containing a comparatively high amount of nickel (Ni). Nickel is primarily used to achieve a specific microstructure. In addition, it has a beneficial effect on mechanical properties and certain types of corrosion.

Iron (Fe) 44.9 to 57.8
Nickel (Ni) 23 to 27
Chromium (Cr) 19 to 23
Manganese (Mn) 0 to 2.0
Silicon (Si) 0 to 2.0
Carbon (C) 0.2 to 0.5
Molybdenum (Mo) 0 to 0.5
Phosphorus (P) 0 to 0.040
Sulfur (S) 0 to 0.040

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

Followup Questions

Similar Alloys

Further Reading

ASTM A297: Standard Specification for Steel Castings, Iron-Chromium and Iron-Chromium-Nickel, Heat Resistant, for General Application

Corrosion of Austenitic Stainless Steels: Mechanism, Mitigation and Monitoring, H. S. Khatak and B. Raj (editors), 2002

Austenitic Stainless Steels: Microstructure and Mechanical Properties, P. Marshall, 1984

ASM Specialty Handbook: Stainless Steels, J. R. Davis (editor), 1994

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