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Continuous Galvanizing

Advantages of the Gregory continuous-process galvanized guardrail

Gregory expertise at galvanizing steel provides the highest quality highway guardrail products. Uniform and smooth zinc coating across the entire surface of the guardrail provides superior performance against corrosion resistance plus advantages in handling safety and installation.

The key is Gregory's ability to galvanize entire steel coils before roll forming rather than after. This process is called continuous galvanizing and conforms to AASHTO M-180 and ASTM A-653.

Continuous galvanizing of steel coils before fabrication has significant benefits over other coating methods. This unique process provides a thicker, purer zinc coating that is nearly 100% pure zinc. Hot-dip galvanizing after fabrication yields 50% or more iron zinc alloy containing 10% or more iron. The difference becomes visible when guardrail is exposed over periods of time outdoors: alloy-type coatings will discolor to a rusty tint while continuous galvanized coating will remain gray for the life of the coating.

An additional benefit of continuous galvanized steel is that the zinc coating is more ductile than the alloy coating of post-fabrication, batch-dip methods. This ductility provides superior abrasion resistance during the rigors of construction and throughout the service life of the guardrail.

The Gregory continuous galvanizing process can provide true Type 1 or Type 2 coating specifications in accordance with AASHTO M-180 specifications. Batch-dip galvanizing operations do not have this degree of control.

Advantages of the Gregory Continuous-process Galvanized Guardrail
  • Uniform zinc coating eliminates weak spots in corrosion resistance
  • Easier assembly: no build-up at bolt holes and splice locations
  • Safer handling: smooth edges without injurious points and hooks
  • Clean holes and slots: punched after galvanizing for accurate dimensions
  • Nearly 100% pure zinc coating will not discolor for life of the coating
  • Four-to-five times lower lead content minimizes environmental impact

More Information

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Gregory Industries, Inc. • 4100 13th Street, SW • Canton, Ohio 44710 • Phone 330-477-4800
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