Chrome Plating

Although most processors are familiar with chrome-plating, there is an important specification to be considered in purchasing a chrome-plated screw or having a repaired screw chrome-plated. The critical specification is the depth of the plating. It is not enough to plate a screw with less than .001” (referred to as “flash chroming”). Flash chromed screws tend to nick and then peal off into the resin causing reject parts and opening the screw to severe wear to the unprotected, typically, soft 4000 series alloy steel. Chrome-plating should be at least .003” to .005” thick and guaranteed by your supplier.

Most of the screws that are not manufactured from solid tool steels or special alloys have a flight hard-surfacing material welded to form the outside diameter of the screw flights. New flight hard-surfacing materials are being continually introduced to the market but none of the more commonly used types can approach the wear resistance of the tool steel screws.

The hard-surfacing materials are predominantly cobalt-based or nickel-based. The most common cobalt-based materials include the Stellites (6 and 12) which exhibit uniform wear and are satisfactory in non-corrosive environments. The nickel-based materials include the Colmonoys (5, 6, 56, and 83). The wear and corrosion resistance of these materials is somewhat better than the cobalt-based materials, based on the field experience of our customers.

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