Nickel Alloy Plate

Sandmeyer Steel Company stocks Alloy 330 nickel alloy plate in thicknesses from 3/16" (4.8mm) through 1" (25.4mm) for applications in the thermal, chemical and petrochemical, and ore processing markets as well as for the power generation industry. Alloy 330 (UNS N08330) is comparable to and competes directly with RA330®.

Available thicknesses for Alloy 330:

3/16" 1/4" 3/8" 1/2" 5/8" 3/4"
4.8mm 6.3mm 9.5mm 12.7mm 15.9mm 19mm
 
1"
25.4mm

Alloy 330 (UNS N08330) is an austenitic nickel-iron-chromium alloy developed to provide excellent resistance to carburizing and oxidizing atmospheres at elevated temperatures. With a nickel content of 34 to 37 percent, the alloy remains highly resistant to both chloride stress corrosion cracking and embrittlement from the precipitation of sigma phase. It is readily fabricated using standard procedures for stainless steel and nickel alloys. The alloy is used extensively in elevated temperatures where resistance to the combined effects of thermal cycling and carburization is required.

Specification Sheet Overview

for Alloy 330 (UNS N08330)
Nickel-Iron-Chromium Alloy Offering Excellent Resistance to Carburizing & Oxidizing Atmospheres

General Properties

Alloy 330 (UNS N08330) is an austenitic nickel-iron-chromium alloy developed to provide excellent resistance to carburizing and oxidizing atmospheres at elevated temperatures. With a nickel content of 34 to 37 percent, the alloy remains highly resistant to both chloride stress corrosion cracking and embrittlement from the precipitation of sigma phase.

The high nickel and chromium content provides excellent resistance to both oxidation and carburization. The oxidation resistance is also enhanced by the silicon content of the alloy. The alloy performs well under cyclic conditions of heating and cooling and in alternate carburizing and oxidizing atmospheres.

Alloy 330 offers a high level of corrosion resistance, particularly to oxidation, carburization, and nitridation. It is readily fabricated using standard procedures for stainless steels and nickel alloys. The alloy is used extensively in elevated temperature atmospheres where resistance to the combined effects of thermal cycling and carburization is required.


Applications

  • Chemical and Petrochemical Processing
    • Cracked ammonia components
    • Petrochemical furnace parts
    • Petrochemical waste remediation units
    • Heat exchangers
    • Flares
  • Ore Processing
    • Perlite systems and equipment
  • Power Generation
    • Boiler fixtures
    • Gas turbine components
  • Thermal Processing
    • Heat-treat furnace containers
    • Heat-treat furnace components
    • High temperature fans
    • Salt pots

Standards

ASTM..................B 536
ASME..................SB 536
AMS...................5592

Chemical Analysis

Typical Values (Weight %)

Nickel 34.0 - 37.0 Chromium 17.0 - 20.0
Iron Balance* Carbon 0.08 max.
Silicon 0.75 - 1.50 Manganese 2.0 max.
Phosphorus 0.030 max. Sulfur 0.030 max.

*Alloy predominates remaining composition. Other elements may be present only in minimal quantities.

Physical Properties

Density

0.292 lbs/in3
8.08 g/cm3

Specific Heat

0.11 BTU/lb°F (32-212°F)
460 J/kg°C (0-100°C)

Magnetic Permeability

1.02 at 70°F/20°C (RT)

Linear Coefficient of Thermal Expansion

Thermal and Electrical Properties

Temperature Thermal Conductivity Electrical Resistivity
°F °C Btu-in/ft2M/-h-°F W/m-°C ohm-circ mil/ft mW-m
75 24 86 12.4 612 1.017
400 204 108 15.6 649 1.079
800 227 134 19.3 688 1.144
1200 649 162 23.4 721 1.199
1600 871 198 28.6 744 1.237
1800 982 216 31.2 749 1.245

Mechanical Properties

Typical Room Temperature Mechanical Properties, Mill Annealed

Yield Strength
0.2% Offset
Ultimate Tensile
Strength
Elongation
in 2 inches (50mm)
Hardness
ksi (MPa) ksi (MPa) % Rockwell B
30 - 43 207 - 296 80 - 85 552 - 586 40 - 45 70 - 85

High Temperature Mechanical Properties
Tensile Properties of Annealed Material




Corrosion Resistance

Alloy 330 provides a high level of corrosion resistance, particularly to oxidation, carburization, and nitridation. In aqueous environments the chromium content of 330 provides resistance to oxidizing conditions, while the nickel content enhances resistance to reducing conditions. The alloy’s high nickel content also makes it highly resistant to chloride stress corrosion cracking and sigma phase embrittlement.

Oxidation Resistance

Alloy 330 has good oxidation resistance and resists scale formation up to about 2000°F (1095°C). Any scale which is formed is tightly adherent, particularly under cyclic conditions of heating and cooling.

Carburization Resistance

The alloy's 35 percent nickel content and silicon addition contribute greatly to its excellent resistance to carburization. In alternating carburizing and oxidizing atmospheres, Alloy 330 exhibits excellent resistance to the “green rot” phenomenon.

Nitridation Resistance

Alloy 330 exhibits good resistance to nitrogen-containing atmospheres where the oxygen content is low. It is used extensively in components handling cracked ammonia.

Heat Treatment

Alloy 330 is an austenitic alloy that cannot be hardened by thermal treatment. Only cold working will contribute to increased room temperature strength. For most high temperature applications, 330 is not annealed after cold forming or welding.

If a full anneal is required, it should be carried out in a temperature range of 1870-2050°F (1020-1120°C). Water quenching provides the optimum creep resistance, but rapid air cooling to below 800°F (425°C) may also be utilized.

Fabrication

Alloy 330 is readily hot or cold formed using the standard procedures for austenitic stainless steels and nickel alloys. The work hardening rate of the alloy is comparable to austenitic stainless steels.

Forming at room temperature is suggested. If hot working is required, the alloy should be heated uniformly to a starting temperature of 2050-2150°F (1120-1180°C) and finished above 1750¼F (950°C). Cooling should be by water quenching or as fast as possible. Annealing is recommended after hot working to ensure maximum corrosion resistance and optimum grain structure.

Forming or bending should not take place in the low ductility range of 1200-1600°F (650-870°C). This can cause intergranular tearing in austenitic alloys.

Welding

Alloy 330 can be welded by GTAW, SMAW, and plasma arc processes. For optimum corrosion resistance GTAW is preferred.

Prior to welding, the material should be in the annealed condition, clean and free from scale, grease, and other contaminants. A zone approximately 1 inch wide on each side of the joint should be ground to bright metal.

The interpass temperature should not exceed 300°F (150°C). Neither pre- nor post-weld heat treatment is required. Alloy 330 can be readily welded to a variety of dissimilar metals.

NOTE: The information and data in this product data sheet are accurate to the best of our knowledge and belief, but are intended for informational purposes only, and may be revised at any time without notice. Applications suggested for the materials are described only to help readers make their own evaluations and decisions, and are neither guarantees nor to be construed as express or implied warranties of suitability for these or other applications.

RA330® is a registered trademark of Rolled Alloys

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