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ASTM Grade HL (29Cr-20Ni, N08604) Cast Stainless Steel

ASTM grade HL steel is an austenitic stainless steel formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. HL is the ASTM designation for this material. N08604 is the UNS number. And 29Cr-20Ni 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 HL 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

150

Elastic (Young's, Tensile) Modulus

200 GPa 29 x 106 psi

Elongation at Break

11 %

Fatigue Strength

150 MPa 22 x 103 psi

Poisson's Ratio

0.27

Shear Modulus

80 GPa 12 x 106 psi

Tensile Strength: Ultimate (UTS)

500 MPa 73 x 103 psi

Tensile Strength: Yield (Proof)

270 MPa 40 x 103 psi

Thermal Properties

Latent Heat of Fusion

320 J/g

Maximum Temperature: Corrosion

460 °C 860 °F

Maximum Temperature: Mechanical

1100 °C 2010 °F

Melting Completion (Liquidus)

1390 °C 2530 °F

Melting Onset (Solidus)

1340 °C 2450 °F

Specific Heat Capacity

490 J/kg-K 0.12 BTU/lb-°F

Thermal Expansion

17 µm/m-K

Otherwise Unclassified Properties

Base Metal Price

27 % relative

Density

7.8 g/cm3 490 lb/ft3

Embodied Carbon

4.5 kg CO2/kg material

Embodied Energy

65 MJ/kg 28 x 103 BTU/lb

Embodied Water

210 L/kg 26 gal/lb

Common Calculations

PREN (Pitting Resistance)

31

Resilience: Ultimate (Unit Rupture Work)

48 MJ/m3

Resilience: Unit (Modulus of Resilience)

180 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

18 points

Strength to Weight: Bending

18 points

Thermal Shock Resistance

11 points

Alloy Composition

Among cast stainless steels, the composition of ASTM grade HL steel is notable for containing a comparatively high amount of chromium (Cr). Chromium is the defining alloying element of stainless steel. Higher chromium content imparts additional corrosion resistance.

Iron (Fe) 40.8 to 53.8
Chromium (Cr) 28 to 32
Nickel (Ni) 18 to 22
Manganese (Mn) 0 to 2.0
Silicon (Si) 0 to 2.0
Carbon (C) 0.2 to 0.6
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

Welding Metallurgy of Stainless Steels, Erich Folkhard et al., 2012

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