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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

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)

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