Nickel Iron Chromium Alloy 800H Tubes ASTM B407 N08810 Seamless and Welded

1. Brief Introduction

 ASTM B407 N08810 (UNS N08810) is a high-performance nickel-iron-chromium alloy designed for high temperature and highly corrosive environments.

Its excellent oxidation, carburization, and sulfidation resistance make it a core material for the petrochemical, nuclear power, and heat treatment industries.

The alloy achieves high-temperature strength through solid solution strengthening and can be used stably for a long time below 650°C.

2. Chemical composition

3. Mechanical properties (annealed state)

• Tensile strength (Rm): ≥550 MPa

• Yield strength (Rp0.2): ≥240 MPa

• Elongation (A50mm): ≥30%

• Hardness (HBW): ≤200

Note: Mechanical properties can be optimized by solution annealing (1050-1150°C water cooling).

4. Physical properties

5. Key advantages

• High temperature performance: Maintains high strength in the range of 600-800°C, and has excellent creep resistance.

• Corrosion resistance: Resistant to H₂S, Cl⁻, sulfuric acid and nitric acid environments, and resists chloride stress corrosion cracking (Cl-SCC).

• Oxidation resistance: A dense Cr₂O₃ oxide film is formed on the surface, and the oxidation resistance temperature reaches 1100°C.

• Processing performance: Can be cold/hot formed, and welding is compatible with TIG, MIG and arc welding (ERNiCr-3 welding materials are recommended).

6. Application fields

• Petroleum and natural gas: cracking furnace tubes, hydrogenation reactors, sulfur recovery units.

• Chemical equipment: acid regeneration systems, high-temperature reactors, nitric acid condensers.

• Nuclear power: nuclear waste treatment containers, heat exchanger pipes.

• Heat treatment industry: radiation tubes, carburizing furnace internals.

• Marine engineering: seawater desalination evaporators, deep-sea pipelines.

• Environmental protection equipment: flue gas desulfurization (FGD) systems, waste incinerator components.