Alloy A286 Round Alloy A286 Flat Alloy A286 Forged Bars

Product Description

1. Alloy A286 Round Bars

Round bars are the most widely available form of A286, typically manufactured via hot rolling followed by cold drawing, peeling, or centerless grinding.

• Grain Flow: The microstructure features highly uniform, longitudinal grain orientation running perfectly parallel to the axis of the bar.

• Surface Finishes: Frequently supplied as centerless ground or smooth-turned, providing exceptionally tight outside diameter (OD) tolerances optimized for high-speed automated CNC setups.

• Best Used For: High-stress concentric hardware, including aerospace fasteners, turbine studs, jet engine bolts, and exhaust valves.

• Common Aerospace Specs: AMS 5731 (supplied solution treated only) and AMS 5732 / AMS 5737 (supplied solution treated and precipitation aged).

2. Alloy A286 Flat Bars

Flat bars are either hot-rolled directly to size on specialty mills or sheared and edge-conditioned from high-quality A286 plate stock.

• Grain Flow: Exhibits a planar grain orientation. Because the material undergoes heavy reduction in width and thickness during production, it develops mechanical anisotropy—meaning its ductility and strength vary slightly if tested along the length versus across the width.

• Surface Finishes: Usually delivered in an HRAP (Hot Rolled, Annealed, and Pickled) or abrasive-blasted state.

• Best Used For: High-temperature structural brackets, aerospace casing stiffeners, furnace tracks, and linear reinforcement components where cylindrical stock would require excessive, wasteful machining.

3. Alloy A286 Forged Bars

Forged bars (often referred to as smooth-forged or open-die forged blocks) are worked down from heavy cast ingots using massive hydraulic presses or forging hammers.

• Grain Flow: Offers the absolute highest microstructural integrity. Multi-directional forging thoroughly breaks up internal cast segregation, heals micro-voids, and forces a highly refined, continuous three-dimensional grain flow that closely contours the shape of the bar.

• Surface Finishes: Typically supplied with a rough-turned or peeled finish. They are intentionally produced oversized to leave a generous machining allowance for clearing away the outer scale layer.

• Best Used For: Large-diameter shafts, heavy gas turbine rotors, high-pressure industrial pump components, and massive flanges subjected to extreme cyclic thermal and mechanical stresses.

Technical Summary: Form Factor Reference