Introduction

Incoloy 330 Alloy (UNS N08330) is an austenitic nickel-iron-chromium alloy designed for high-temperature service with excellent resistance to oxidation, carburization, and thermal shock. The alloy contains 34–37% nickel, 17–20% chromium, with the balance iron, and features controlled silicon content (0.75–1.50%) which enhances oxidation resistance and carburization resistance at elevated temperatures. This heat resistant alloy 330 maintains a fully austenitic microstructure at all temperatures and is not subject to embrittlement from sigma phase formation. This high temperature alloy 330 delivers superior thermal shock resistance and excellent thermal stability, making it the preferred material for furnace tubes, radiant tubes, heat treatment furnaces, industrial furnaces, petrochemical processing, thermal processing, and annealing furnaces. Available in Incoloy 330 tube, seamless tube, welded tube, pipe, plate, sheet, and bar, in cold drawn, annealed, pickled, and bright annealed conditions.

Specifications & Process Options

Applications

1. Furnace Tubes & Radiant Tubes

• For furnace tubes in continuous annealing lines, roller hearth furnaces, and bell annealers, Incoloy 330 for furnace tubes delivers exceptional oxidation resistance and thermal shock resistance up to 1150°C (2100°F). This furnace alloy 330 maintains structural integrity under rapid heating and cooling cycles without cracking, significantly outlasting 310 stainless steel in high-temperature furnace service.

• For radiant tubes in gas‑fired and electrically heated industrial furnaces, Incoloy 330 tube withstands thermal fatigue and carburization in carburizing, carbonitriding, and nitriding atmospheres. This heat resistant alloy tube is the preferred material for U‑type, W‑type, and straight radiant tube configurations.

• For furnace muffles, retorts, and inner covers in batch and continuous heat treating, Alloy 330 seamless tube maintains shape and strength under heavy loads at elevated temperatures. This furnace grade nickel alloy is widely used in heat treatment equipment for steel, copper, and aluminum processing.

2. Heat Treatment Furnaces & Thermal Processing

• For heat treatment furnaces including annealing, hardening, and tempering operations, Incoloy 330 for heat treatment furnaces provides excellent resistance to carburization and oxidation in furnace atmospheres. The carburization resistant alloy prevents carbon penetration and metal dusting in carburizing atmospheres, making it ideal for atmosphere carburizing and carbonitriding applications.

• For thermal processing equipment including heat‑treating baskets, trays, and fixtures, Incoloy 330 tube and sheet are fabricated into complex shapes with good formability and weldability, ensuring long‑term performance under repeated thermal cycles.

3. Petrochemical Industry & Chemical Processing

• For petrochemical industry furnace cracker tubes, reformer pigtails, and transfer line exchangers, Incoloy 330 for petrochemical industry withstands high‑temperature hydrocarbon environments with resistance to oxidation and carburization. The high temperature alloy 330 maintains mechanical properties in ethylene cracking furnaces and hydrogen reformers.

• For chemical processing equipment handling oxidizing and reducing media at elevated temperatures, Alloy 330 tube provides high temperature corrosion resistance and good resistance to chloride‑ion stress‑corrosion cracking.

4. Industrial Furnaces & Annealing Furnaces

• For industrial furnace components including burner tubes, muffles, and furnace roller rails, Incoloy 330 for industrial furnace delivers long service life with excellent resistance to oxidation and carburization in furnace atmospheres.

• For annealing furnaces and bright annealing operations, Incoloy 330 tube maintains surface quality and structural integrity during high‑temperature processing of stainless steel and copper alloys.

5. Heat Exchangers & Kiln Equipment

• For heat exchangers in high‑temperature corrosive service, Incoloy 330 tube provides thermal shock resistant alloy performance with good thermal conductivity and resistance to oxidation.

• For kiln equipment, rotary kiln gas tubes, and preheater tubes in mineral processing and cement production, nickel alloy 330 tube offers long service life under cyclic thermal conditions.

FAQ – Incoloy 330 Alloy

Q: What is the difference between Incoloy 330 and Incoloy 800H?

A: Incoloy 330 alloy (UNS N08330) is specifically designed for furnace and heat‑treating applications with superior resistance to carburization and thermal shock. Incoloy 800H is optimized for high‑temperature strength and creep resistance in petrochemical and power generation applications. Incoloy 330 offers better carburization resistance and thermal fatigue resistance; Incoloy 800H provides higher creep‑rupture strength.

Q: What is the maximum operating temperature for Incoloy 330?

A: Incoloy 330 alloy is suitable for continuous service up to 1150°C (2100°F). It maintains good oxidation resistance and structural stability in carburizing and oxidizing atmospheres at elevated temperatures. The fully austenitic microstructure remains stable throughout the operating temperature range and is not subject to sigma phase embrittlement.

Q: What are the key ASTM standards for Incoloy 330 tube?

A: ASTM B535 covers seamless tube; ASTM B536 covers welded tube and pipe; ASTM B511 covers bar. ASME equivalents include SB535, SB536, and SB511 for pressure vessel applications.

Q: What industries commonly use Incoloy 330?

A: Industrial furnaces and heat treatment equipment (radiant tubes, muffles, retorts, baskets, trays, fixtures), petrochemical processing (furnace cracker tubes, reformer pigtails, transfer line exchangers), thermal processing (annealing furnaces, carburizing furnaces), chemical processing, and heat exchanger manufacturing. This furnace alloy 330 is the material of choice for high‑temperature furnace applications requiring carburization and oxidation resistance.

We are a trusted Incoloy 330 Tube Supplier and Incoloy 330 Tube Manufacturer, China‑based, serving industrial furnace builders, heat treatment equipment manufacturers, petrochemical processors, and thermal processing equipment suppliers worldwide. All products comply with ASTM B535 / ASTM B536 / ASME SB535 with EN 10204 3.1 mill certificates, PMI verification, and dimensional inspection reports. We offer Incoloy 330 seamless tube, welded tube, pipe, plate, sheet, and bar in custom sizes, with cut‑to‑size, precision machining, and bright annealing services. Contact us at info@monokj.com for size chart, pricing, or custom requirements.