How a Lump of Hot Steel Becomes a Walk-Through Ring - Video

A solid block of steel is never just cut into shape.
Press it once, spin it through a rolling mill, and the center expands until a man can step right through it.
The metal grows outward without losing its thickness.

Work Overview
A heated lump of steel is press-flattened, pierced, and expanded on a rolling mill to form a large, seamless metal ring.

Materials and Equipment Used

Heavy-duty metal tongs and overhead chain hoist

Industrial hydraulic forging press

Rotating ring rolling mill

Protective safety gear and face masks

Construction / Operation Procedure

A glowing lump of hot steel is dragged out of the furnace and placed onto the press to be flattened in a single strike.

The flattened steel goes onto the rolling mill where internal rollers widen the center hole while expanding the outer diameter.

The ring continues to spin and grow until it reaches the desired size, large enough for a person to step through.

Significance of the Work
Seamless ring rolling aligns the grain structure rather than tearing it, making the final metal ring vastly stronger and less prone to cracking than cold-formed or welded alternatives.

Guideline Compliance & Educational Purpose
This footage is shared strictly for educational and informational purposes. All operations are performed by trained professionals in a controlled industrial environment. Viewers should not attempt to replicate these procedures without proper training and safety equipment.
This video was produced within the scope of fair use. Original commentary, criticism and careful editing provide added value beyond the original source.

▶ Source : Inside the factory

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