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UNS N08330 (Alloy 330) Stainless Steel

N08330 stainless steel is a superaustenitic (highly alloyed) stainless steel formulated for primary forming into wrought products. Cited properties are appropriate for the annealed condition. N08330 is the UNS number for this material. Alloy 330 is the common industry name.

This material is well established: the Further Reading section below cites a number of published standards, and that list is not necessarily exhaustive.

It has a moderately low ductility among wrought superaustenitic stainless steels. In addition, it has a fairly low tensile strength and a moderately low embodied energy.

The graph bars on the material properties cards below compare N08330 stainless steel to: wrought superaustenitic 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

34 %

Fatigue Strength

190 MPa 27 x 103 psi

Poisson's Ratio

0.28

Rockwell B Hardness

80

Shear Modulus

76 GPa 11 x 106 psi

Shear Strength

360 MPa 53 x 103 psi

Tensile Strength: Ultimate (UTS)

550 MPa 79 x 103 psi

Tensile Strength: Yield (Proof)

230 MPa 34 x 103 psi

Thermal Properties

Latent Heat of Fusion

310 J/g

Maximum Temperature: Corrosion

420 °C 780 °F

Maximum Temperature: Mechanical

1050 °C 1920 °F

Melting Completion (Liquidus)

1390 °C 2530 °F

Melting Onset (Solidus)

1340 °C 2450 °F

Specific Heat Capacity

480 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

12 W/m-K 6.9 BTU/h-ft-°F

Thermal Expansion

16 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

1.7 % IACS

Electrical Conductivity: Equal Weight (Specific)

1.9 % IACS

Otherwise Unclassified Properties

Base Metal Price

32 % relative

Density

8.0 g/cm3 500 lb/ft3

Embodied Carbon

5.4 kg CO2/kg material

Embodied Energy

77 MJ/kg 33 x 103 BTU/lb

Embodied Water

190 L/kg 23 gal/lb

Common Calculations

PREN (Pitting Resistance)

19

Resilience: Ultimate (Unit Rupture Work)

150 MJ/m3

Resilience: Unit (Modulus of Resilience)

140 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

19 points

Strength to Weight: Bending

18 points

Thermal Diffusivity

3.1 mm2/s

Thermal Shock Resistance

13 points

Alloy Composition

Among wrought stainless steels, the composition of N08330 stainless steel is notable for including tin (Sn) and lead (Pb). Tin is used to improve formability and surface quality. Lead is a highly unusual addition to stainless steel, and has no commonly accepted role.

Iron (Fe) 38.3 to 48.3
Nickel (Ni) 34 to 37
Chromium (Cr) 17 to 20
Silicon (Si) 0.75 to 1.5
Manganese (Mn) 0 to 2.0
Copper (Cu) 0 to 1.0
Carbon (C) 0 to 0.080
Phosphorus (P) 0 to 0.030
Sulfur (S) 0 to 0.030
Tin (Sn) 0 to 0.025
Lead (Pb) 0 to 0.0050

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

Followup Questions

Similar Alloys

Further Reading

ASTM B511: Standard Specification for Nickel-Iron-Chromium-Silicon Alloy Bars and Shapes

ASTM B535: Standard Specification for Nickel-Iron-Chromium-Silicon Alloys (UNS N08330 and N08332) Seamless Pipe and Tube

ASTM B536: Standard Specification for Nickel-Iron-Chromium-Silicon Alloys (UNS N08330 and N08332) Plate, Sheet, and Strip

ASTM B710: Standard Specification for Nickel-Iron-Chromium-Silicon Alloy Welded Pipe

ASTM B739: Standard Specification for Nickel-Iron-Chromium-Silicon Alloy Welded Tube

ASTM B546: Standard Specification for Electric Fusion-Welded Ni-Cr-Co-Mo Alloy (UNS N06617), Ni-Fe-Cr-Si Alloys (UNS N08330 and UNS N08332), Ni-Cr-Fe-Al Alloy (UNS N06603), Ni-Cr-Fe Alloy (UNS N06025), and Ni-Cr-Fe-Si Alloy (UNS N06045) Pipe

EN 10095: Heat resisting steels and nickel alloys

Nickel Alloys, Ulrich Heubner (editor), 1998

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