Inconel 625 Forged Ring | High-Temp & Corrosion Resistant Alloy Ring

ASTM B564 UNS N06625 Forged Ring: Ultra-High Performance Nickel Alloy Ring

ASTM B564 UNS N06625 forged rings typically refer to ring forgings made from Inconel 625 alloy through a forging process. It is a nickel-based superalloy with molybdenum and niobium as the main strengthening elements, exhibiting excellent corrosion resistance, high-temperature resistance, and oxidation resistance, and is widely used in extreme industrial environments.

Material Composition & Properties

Mechanical Properties:

• • • Tensile Strength: ≥760 MPa
    • Yield Strength (0.2% offset): ≥345 MPa
    • Elongation: ≥30%
    • Hardness: ≤30 HRC
  • Corrosion Resistance:
    • Withstands sulfuric acid, phosphoric acid, and seawater environments.
    • Resists oxidation up to 1000°C (1832°F).
  • Thermal Stability:
    • Maintains strength and ductility in cryogenic to high-temperature ranges (-196°C to 1000°C).

Why the "Forged" Process?

A "forged ring" is a ring-shaped component produced through forging, typically via ring rolling or open-die forging, with ring rolling being more common.

Advantages of the Forging Process:

1. Grain Refinement & Improved Microstructure: The forging process (especially hot forging) uses immense plastic deformation to break down the coarse as-cast grain structure, refining it and aligning it to form a dense, uniform, fibrous grain flow.

2. Significantly Enhanced Mechanical Properties: The refined grain structure directly results in higher strength, better toughness, and superior fatigue and creep resistance. This is critical for components used in extreme service conditions.

3. Elimination of Internal Defects: Forging can heal internal porosity, micro-cracks, and other defects in the original ingot, improving the material's density and integrity.

4. Material Savings & Near-Net Shape: Particularly with ring rolling, a ring blank very close to the final part shape can be produced, drastically reducing machining waste and saving costly raw material.

Manufacturing Process Overview for 625 Forged Rings
The typical manufacturing sequence for a 625 forged ring is as follows:

1. Melting & Ingot Production: Using Vacuum Induction Melting (VIM) followed by ElectroSlag Remelting (ESR) or Vacuum Arc Remelting (VAR) to produce a high-purity, chemically homogeneous alloy ingot.
2. Forging the Billet: The ingot is heated and subjected to multiple upsetting and drawing operations to break down the cast structure completely, forming a pancake or bar-shaped preform.
3. Punching/Pre-forming: The billet is worked into a doughnut-shaped preform with a central hole.
4. Ring Rolling: The heated preform is placed over a mandrel on a ring rolling machine. Under pressure from the main roll and the radial advancement of the mandrel, the wall thickness decreases, and the diameter expands until the required dimensions are achieved. This is the key step in creating the circumferential grain flow.
5. Heat Treatment: Solution annealing is performed, heating the alloy to a high temperature (typically above 1100°C) to dissolve all strengthening elements into the matrix, followed by rapid cooling (water quench or air cool) to obtain a uniform supersaturated solid solution, optimizing its overall properties.
6. Machining: The forged ring is precision machined (turned, milled, drilled) according to the final drawing specifications to achieve dimensional accuracy and surface finish.
7. Inspection & Certification: Undergoes comprehensive non-destructive testing (e.g., ultrasonic inspection, liquid penetrant testing) and mechanical testing (tensile, impact, hardness) to ensure product quality.

Applications

• • Aerospace: Jet engine components (combustor liners, turbine seals), rocket propulsion systems.
  • Oil & Gas: Subsea equipment, downhole tools, and pipelines in corrosive offshore environments.
  • Chemical Processing: Reactors, heat exchangers, and valves handling acidic or high-temperature media.
  • Power Generation: Nuclear reactor components, boiler tubes, and gas turbine parts.
  • Marine: Propeller shafts, seawater piping, and offshore platform hardware.