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Bimetallic barrels

The tungsten carbide bore inlay on a bimetallic barrel has been modified to include Durocast tungsten carbide chemistry. The manufacturer initially introduced Durocast in 2001 and says in the years since the casting process has advanced, improving carbide dispersion uniformity and boosting wear resistance. The resulting product, called 777-Durocast, represents a proprietary alloy with a high content of spherical-shaped tungsten carbide bound in a chromium-boron-nickel matrix.

ASTM G65 abrasive and G77 block and ring wear tests showed an improvement in wear resistance of more than 8% compared to the original Durocast, with an 11% improvement over the former alloy. The barrels feature more than 75% tungsten carbide by weight, with less than 5% iron dilution. The estimated productive wear life is up to eight times greater than common nitride barrels, according to wear analysis and field experience. The manufacturer says the product also has a lower coefficient of friction and four times the abrasion resistance of standard bimetallics in dry-sand abrasion testing. Wexco Corp., Lynchburg, VA, U.S.A.; +1 800-999-3926    

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