Bright Annealed Inconel 625 Pipe Diameter 6 - 89mm ASTM DIN EN JIS Standard Alloy 625

Bright Annealed Inconel 625 Pipe Diameter 6 - 89mm ASTM DIN EN JIS Standard Alloy 625

More Specification Informations

1. Key Technical Parameters

1.1 Dimensional Specifications

• Outer Diameter (OD): 6mm to 89mm (a versatile range that supports both low - flow precision systems, such as 6mm pipes for laboratory instrumentation, and higher - capacity industrial lines, like 89mm pipes for chemical processing).
• Wall Thickness: Typically ranges from 0.8mm to 6mm, with customization available based on pressure requirements. Thicker walls (e.g., 4 - 6mm) are used for high - pressure applications (e.g., oil and gas wellheads), while thinner walls (0.8 - 2mm) suit low - pressure fluid transfer (e.g., cooling loops).
• Length: Standard lengths include 3m, 6m, or 12m; cut - to - order lengths are also offered to minimize on - site waste.
• Surface Finish: Bright annealed (BA) finish, achieved via controlled heat treatment (annealing) followed by chemical or mechanical polishing. This results in a smooth, reflective surface (Ra ≤ 0.8μm) that reduces fluid friction, prevents material buildup, and enhances corrosion resistance.

1.2 Chemical Composition (Weight %)

1.3 Mechanical Properties (After Bright Annealing)

• Tensile Strength: 827 MPa (120,000 psi) min.
• Yield Strength (0.2% Offset): 414 MPa (60,000 psi) min.
• Elongation (in 50mm): 30% min (ensures ductility for forming or bending without cracking).
• Hardness: ≤ 220 HB (Brinell) or ≤ 23 HRC (Rockwell C); the soft, ductile nature simplifies fabrication (e.g., welding, flanging).

2. Core Performance Advantages

2.1 Exceptional Corrosion Resistance

• General Corrosion: Resists attack from organic acids (e.g., acetic acid), inorganic acids (e.g., sulfuric acid, nitric acid), and alkalis (e.g., sodium hydroxide), making it ideal for chemical processing.
• Localized Corrosion: Molybdenum and niobium inhibit pitting and crevice corrosion in aggressive media, such as seawater, salt sprays, and oilfield brines—critical for marine and offshore applications.
• Stress Corrosion Cracking (SCC): Nickel - rich composition prevents SCC in chloride or hydrogen sulfide (H₂S) environments, a common failure mode for lesser alloys (e.g., 316 stainless steel).

2.2 High - Temperature Stability

• Oxidation Resistance: Maintains structural integrity and resists scaling at temperatures up to 1093°C (2000°F) in air or oxidizing atmospheres, suitable for furnace components or exhaust systems.
• Creep Resistance: Retains strength under long - term exposure to high temperatures and mechanical loads (e.g., 650°C/1200°F for 10,000 hours), preventing deformation in power generation turbines or heat exchangers.

2.3 Enhanced Fabricability & Durability

• Bright Annealing Benefits: The annealing process eliminates residual stresses from manufacturing (e.g., extrusion, drawing), reducing the risk of cracking during welding or installation. The smooth BA surface also minimizes fluid turbulence and fouling, extending the pipe’s service life.
• Weldability: Compatible with common welding methods (TIG, MIG, SMAW) without losing corrosion or mechanical properties. Post - weld heat treatment is often unnecessary, simplifying on - site assembly.

3. Compliance with International Standards

4. Equivalent Grades 

• ASTM/ASME: UNS N06625, W.Nr. 2.4856 (German material number).
• EN: NiCr22Mo9Nb (European designation).
• JIS: NW6625 (Japanese Industrial Standard).
• Other Trade Names: Haynes 625, Alloy 625 (generic industry terms).

5. Typical Applications

5.1 Chemical & Petrochemical Industry

• Used for pipes in acid processing (e.g., sulfuric acid, hydrochloric acid), chemical reactors, and catalyst regeneration systems. The 10 - 50mm diameter pipes are common for transferring corrosive fluids, while 60 - 89mm pipes suit larger - volume reactor feed lines.

5.2 Oil & Gas (Upstream & Downstream)

• Upstream: Pipes for offshore wellheads, subsea manifolds, and production tubing (resists seawater corrosion and H₂S in sour gas wells). The 20 - 70mm diameter range is typical for wellhead chokes and flowlines.
• Downstream: Refinery pipes for hydrocracking units and desulfurization processes (withstands high temperatures and sulfur - rich environments).

5.3 Marine & Offshore Engineering

• Applied in seawater cooling systems, offshore platform piping, and shipboard hydraulic lines. The bright annealed surface prevents marine organism fouling, while corrosion resistance ensures longevity in saltwater. 6 - 30mm pipes are used for cooling loops, and 40 - 89mm pipes for main seawater intake lines.

5.4 Power Generation

• Used in fossil fuel power plants (for flue gas desulfurization systems) and nuclear power plants (for coolant pipes in secondary loops). The alloy’s creep resistance makes it suitable for high - temperature steam lines (50 - 89mm diameter).

5.5 Aerospace & Defense

• Small - diameter pipes (6 - 20mm) are used in aircraft engine fuel lines, hydraulic systems, and rocket propulsion components. The bright surface reduces fluid friction, while high - temperature resistance withstands engine heat (up to 980°C/1800°F).

5.6 Medical & Pharmaceutical

• Employed in pharmaceutical manufacturing for sterile fluid transfer (e.g., drug synthesis, vaccine production) and medical device components (e.g., surgical instruments). The smooth BA surface is easy to clean and sterilize, complying with FDA and EMA regulations.