Backing steels for WEXCO bimetallic barrels (cylinders)

AISI 4140 Backing Steel is available for barrel diameters that are outside the standard size range of WEXCO JP38® steels (i.e. barrels with outside diameters of less than 3.5" or larger than 11.5"). However, customers may specify AISI 4140 backing steel for any size barrel.

WEXCO JP-38® Backing Steel offers a significant strength improvement over AISI 4140 steel. This improved strength technology allows WEXCO to manufacture injection cylinders as a one-piece construction, eliminating the need for expensive heat-treated high pressure sleeves.

The performance difference between AISI 4140 steel and WEXCO JP38® steel is substantial! The claim for better performance of JP38 as a cylinder backing steel, first verified through testing, has been confirmed through actual use of JP38 barrels by processors over more than ten years!

The alloying elements in JP38® steel produce a backing tube with minimal internal stresses. The finished barrel remains straight even when exposed to the extreme thermal conditions encountered in the molding process. Currently WEXCO JP38® Backing Steel is available for barrels with 3.5” to 11.5” outside diameter (about 90 - 292 mm).

AISI 316 Stainless  Backing Steel Wexco produces extruder barrels made with various types of stainless steel for food processing and other special applications. (also AISI 304 Stainless on request)

Inconel 625 and 718 Backing Steels are utilized to protect against corrosion and fatigue in high heat applications. Inconel is used on exposed areas in corrosive applications. 

For metal-molding and magnesium applications barrel assemblies are manufactured from proprietary Wexco backing and special bore materials. 

AISI 1020 (series) steel tubes for cylinder "relining" Wexco liners for barrel relining purposes are typically made from AISI 1020 steel tubes. We supply such bimetallic liners to most "Cylinder Repair & Relining Services" located here in the U.S.A., as well as to several located overseas.