Inconel 625 Strip

Inconel 625 strip (designated as UNS N06625 and Werkstoff Nr. 2.4856) represents a primary material choice for handling concurrent thermal stress, mechanical fatigue, and aggressive chemical corrosion. HT PIPE is a SS 316L Pipe supplier with 15+ export experience. Contact us for more information and quotes for free!

Product Forms

• Bar & Rod
• Plate & Sheet
• Coil & Strip
• Pipe & Tube
• Fitting: Flange, Tee, Elbow, Reducer etc.
• Forging: Ring, Shaft, Circle, Block etc.

Chemical Composition Breakdown (Weight %)

The performance of Alloy 625 strip depends heavily on strict adherence to international composition limits:

Global Manufacturing Standards & Specifications

When sourcing precision metal foil or thin coils for critical industrial applications, compliance with standardized certification frameworks guarantees component longevity. Inconel 625 strip is processed and verified under several primary standards depending on the end market:

1. Industrial & Pressure Vessels: ASTM B443 / ASME SB443

This specification governs standard commercial and industrial applications for cold-rolled plate, sheet, and strip. It ensures the material maintains uniform grain structure and dimensional tolerances necessary for stamping, forming, and deep drawing deep-sea or chemical plant components.

2. Aerospace Grade: AMS 5599

Aerospace components demand higher material tracking and tighter testing requirements. AMS 5599 is the definitive aerospace standard for annealed Alloy 625 strip and sheet. Materials supplied under this specification must demonstrate rigorous fatigue resistance and precise grain size controls to handle high-velocity gas flows and cyclic thermal loads.

Mechanical Profiles across Tempers

Depending on the forming requirements, Inconel 625 strip can be engineered across a range of mechanical values:

Mill-Annealed Condition: Optimized for ductile forming. Offers a tensile strength of 830 – 1100 MPa (120 – 150 ksi), a yield strength of 414 – 655 MPa (60 – 95 ksi), and an elongation capability exceeding 30%.

Spring/Hard Temper: Cold worked to maximize fatigue resilience. Tensile strengths can scale up to 1380 – 1724 MPa (200 – 250 ksi), making it highly effective for specialized spring assemblies or diaphragms.

Key Performance Advantages

Unmatched Chloride Resistance

High concentrations of chromium and molybdenum provide Inconel 625 with excellent resistance to localized corrosive attack. The Pitting Resistance Equivalent Number (PREN) for this alloy typically exceeds 45, which helps prevent pitting and crevice corrosion in stagnant sea water or brackish coastal conditions. It is also highly resistant to chloride-ion stress corrosion cracking.

High-Temperature Structural Stability

While standard steels experience rapid grain growth and scaling above 500°C, Alloy 625 strip maintains structural stability from cryogenic baselines up to 982°C (1800°F). The chromium content forms a continuous, adherent oxide surface film that protects the underlying metal from active oxidation and carburization.

Cross-Industry Applications for Strip Profiles

Due to its uniform thickness and cold-rolled finish, Inconel 625 strip is utilized across several precision industrial applications:

Aerospace & Defense

Engine Exhaust Ducting & Thrust Reversers: Handles high-velocity, high-temperature exhaust gas paths.

Honeycomb Core Structures: Laser-welded thin foils forming ultra-lightweight structural panels for heat shields.

Marine and Subsea Engineering

Bellows and Expansion Joints: Used in submerged marine systems and exhaust controls for naval vessels where sea spray is constant.

Diaphragms & Seals: High elasticity and resistance to marine biofouling ensure reliable undersea sensor performance.

Chemical and Hydrocarbon Processing

Heat Exchanger Plates: The high strength of the alloy allows for thinner-walled plate designs, which increases overall thermal efficiency while providing resistance to organic and mineral acids (including hydrochloric, sulfuric, and phosphoric blends).

Processing and Fabrication Considerations

While Inconel 625 strip can be formed using standard workshop methods, its rapid work-hardening rate requires specific adjustments:

Forming: Ensure tooling can handle high shear forces. Heavy, rigid machinery is recommended to prevent springback during bending or stamping profiles.

Welding: The alloy has excellent weldability and does not require post-weld heat treatment to prevent sensitization. Matching filler metal (ERNiCrMo-3 wire) should be utilized to maintain equal corrosion performance across the heat-affected zone (HAZ).

Surface Finishes: Precision strip is typically ordered with a Bright Annealed (BA) or standard cold-rolled finish to minimize friction during fabrication and ensure optimal sealing capabilities in final components.

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