UNS S66286 Round UNS S66286 Flat UNS S66286 Forged Bars

Product Description

1. UNS S66286 Round Bars

Round bars are typically produced by hot-rolling followed by centerless grinding or cold drawing.

• Microstructure: Features uniform, longitudinal grain flow aligned axially along the bar length.

• Common Finishes: Hot-rolled, cold-drawn, smooth-turned, or centerless ground (highly precise OD tolerances suitable for automatic CNC machining).

• Primary Use Case: Ideal for high-speed machining into concentric hardware like high-temperature aerospace fasteners, engine studs, engine valves, and small shaft components.

2. UNS S66286 Flat Bars

Flat bars are either hot-rolled directly or sheared and edged from plate stock.

• Microstructure: Exhibits planar orientation where grain boundaries are flattened out along the width and length, inducing a degree of mechanical anisotropy (properties differ slightly when tested across the width versus the thickness).

• Common Finishes: HRAP (Hot Rolled, Annealed, and Pickled) or sandblasted.

• Primary Use Case: Structural brackets in exhaust systems, high-temperature support jigs, furnace rails, flange backing rings, and components requiring non-concentric machining.

3. UNS S66286 Forged Bars (Smooth or Open-Die Forgings)

Forged bars are worked down from larger ingots under massive hydraulic presses or open-die hammers.

• Microstructure: Superior to rolled products for heavy sections. The extensive hot-working refines the cast ingot dendritic structure, breaks up segregation, and creates an optimized, continuous, three-dimensional grain flow that follows the contours of the block.

• Common Finishes: As-forged (black skin) or rough-turned/peeled. They are heavily oversized to leave ample machining allowance for removing the decarburized surface layer.

• Primary Use Case: Large-diameter shafts, heavy-duty gas turbine rotors, high-pressure pump shafts, and custom flanges operating under intense cyclic or fatigue stresses at elevated temperatures (up to 1300°F / 704°C).

Form Comparison & Processing Trade-offs