High pressure cylinders including backing steel with tool steel lining
AssigneeWexco Incorporated
InventorsDonald W. Smith, Calvin D. Lundeen
Life of this patent
Estimating the term…
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.
Claims47
A method of lining a backing steel cylinder of a high pressure cylinder, the method comprising:
- inserting an annealed tool steel liner material in the form of a bar or tube into the backing steel cylinder, wherein the bar or tube has a length that is substantially coextensive with a length of the backing steel cylinder;
- and
- heat treating the tool steel liner material and backing steel cylinder to harden the tool steel liner material by forming martensite.
A method of lining a backing cylinder of a high pressure cylinder, the method comprising:
- inserting an annealed tool steel liner material in the form of a bar or tube into the backing steel cylinder, wherein the bar or tube has a length that is substantially coextensive with a length of the backing steel cylinder;
- and
- heat treating the tool steel liner and backing steel cylinder, wherein the tool steel liner comprises at least one tool steel selected from AISI A11, AISI D2, 20 CV consisting essentially of 1.9 weight percent C, 0.3 weight percent Mn, 0.3 weight percent Si, 20 weight percent Cr, 1 weight percent Mo, 0.6 weight percent W, 4 weight percent V and the balance Fe, and CSM420 consisting essentially of 0.15 weight percent max C, 1 weight percent Mn, 1 weight percent Si, 12-14 weight percent Cr, 0.04 weight percent P, 0.03 weight percent S and the balance Fe.
A method of lining a backing cylinder of a high pressure cylinder, the method comprising:
- inserting an annealed tool steel liner material in the form of a bar or tube into the backing steel cylinder, wherein the bar or tube has a length that is substantially coextensive with a length of the backing steel cylinder;
- and
- heat treating the tool steel liner and backing steel cylinder, wherein the tool steel liner comprises AISI A11 tool steel.
A method of lining a backing under of a high pressure cylinder, the method comprising:
- inserting an annealed tool steel liner material in the form of a bar or tube into the backing steel cylinder, wherein the bar or tube has a length that is substantially coextensive with a length of the backing steel cylinder;
- and
- heat treating the tool steel liner and backing steel cylinder, wherein the backing steel cylinder comprises microalloy steel.
A method of lining a backing cylinder of a high pressure cylinder, the method comprising:
- inserting an annealed tool steel liner material in the form of a bar or tube into the backing steel cylinder, wherein the bar or tube has a length that is substantially coextensive with a length of the backing steel cylinder;
- and
- heat treating the tool steel liner and backing steel cylinder, wherein the backing steel cylinder comprises AISI 316 stainless steel.
A method of lining a backing cylinder of a high pressure cylinder, the method comprising:
- inserting an annealed tool steel liner material in the form of a bar or tube into the backing steel cylinder, wherein the bar or tube has a length that is substantially coextensive with a length of the backing steel cylinder;
- and
- heat treating the tool steel liner and backing steel cylinder, wherein the backing steel cylinder is heated to an elevated temperature of from about 300 to about 550° C. before the tool steel liner is inserted.
A method of lining a backing cylinder of a high pressure cylinder, the method comprising:
- inserting an annealed tool steel liner material in the form of a bar or tube into the backing steel cylinder, wherein the bar or tube has a length that is substantially coextensive with a length of the backing steel cylinder;
- and
- heat treating the tool steel liner and backing steel cylinder, wherein the heat treating step is performed at a temperature above about 1,000° C.
A method of lining a backing cylinder of a high pressure cylinder, the method comprising:
- inserting an annealed tool steel liner material in the form of a bar or tube into the backing steel cylinder, wherein the bar or tube has a length that is substantially coextensive with a length of the backing steel cylinder;
- and
- heat treating the tool steel liner and backing steel cylinder, wherein the backing steel cylinder and tool steel liner are rotated around a longitudinal axis of the cylinder during the heat treating.
A method of lining a backing cylinder of a high pressure cylinder, the method comprising:
- inserting an annealed tool steel liner material in the form of a bar or tube into the backing steel cylinder, wherein the bar or tube has a length that is substantially coextensive with a length of the backing steel cylinder;
- heat treating the tool steel liner and backing steel cylinder;
- and
- quenching the backing steel cylinder after the heat treating step.
Dependencies are inferred from the claim text.