High pressure cylinders including backing steel with tool...

Metal treatment – Process of modifying or maintaining internal physical... – Producing or treating layered – bonded – welded – or...

Reexamination Certificate

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Details

C148S519000, C148S527000, C148S529000, C148S579000, C148S590000, C148S592000, C029S888060

Reexamination Certificate

active

06887322

ABSTRACT:
High pressure cylinders comprising backing steel cylinders and tool steel liners are disclosed. An annealed tool steel liner is inserted into the backing steel cylinder, followed by heat treating to harden the tool steel liner. The tool steel liner may be provided as a single continuous tube, thereby avoiding problems associated with segmented liners. The high-pressure cylinders are suitable for use as plastic and rubber extruders injection molding cylinders and the like.

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