Tubing Mandrel Bars

At Youngstown Hard Chrome, we hard chrome plate and polish the mandrel bars highlighted here, which are used in the manufacture of seamless tubing. They measure from 6” to 13” in diameter x 528” in length. We process six of these mandrel bars on a daily basis for a company in the local area.

The oversized proportions and massive weight of these workpieces required special handling to maneuver them through the plating line and onto the polishing equipment. In addition, we had to process the mandrel bars in an expedited manner to meet the customer’s delivery schedule to avoid production outages at their plant.

To address the difficulty of handling these large and heavy mandrel bars, we installed two 15-ton capacity overhead hoist cranes. We also situated two 35’ long plating tanks to accommodate the workpieces and then equipped the tanks with eight new plating rectifiers. The powerful new rectifiers provided a controlled flow of low-ripple current over the long plating cycle time, which enabled an exceptionally wear-resistant and abrasion-resistant hard chrome finish to build up with uniform coverage and density. With our large capability polishing equipment, we finished the workpieces entirely in-house.

By accumulating a variety of quality metrics, we confirmed that the plated and polished surface finish met the client specifications. Along with visual inspection, we profiled the surface to ensure there were no cracks, pinholes, or other defects and used a high-resolution digital tester to measure the thickness buildup of the hard chrome plating. Our efficient process methods kept production costs very reasonable and we received extremely complimentary feedback from the customer on the quality of the hard chrome finish.

Contact us today if you are interested in learning more about our hard chrome process capabilities.

Tubing Mandrel Bar Highlights

Project Name & Description
Mandrel Bars for Seamless Tubing
Capabilities Applied/Processes
Chrome Plating
Equipment Used to Manufacture Part
Deep chrome plating tanks
Large Polishers
Overall Part Dimensions
OD: 6” Dia. / 13” Dia. x 528” Length
Tightest Tolerances
Material Used
Industrial Hard Chrome
Material Finish
Industry for Use
In Process Testing/Inspection Performed
Visual Inspection
Digital chrome thickness tester
Profilometer (Surface finish)
6 per day
Delivery/Turnaround Time
6 per day
Delivery Location
Ohio, USA
Standards Met
As per customer specifications

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