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Galvanneal Zinc Coating – Paintable & Weldable Galvanized

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Galvanneal Zinc Coating – Paintable & Weldable Galvanized Specifications Prime Steel Designations & Weights Engineering Data WIZcoat™ galvannealed strut is pro- WIZcoat™ galvannealed strut is pro- Galvannealed G-Strut® is produced duced from prime, hot-rolled carbon duced from steel that is designed to from hot roll carbon steel (ASTM 570) to steel substrate. Material conforms to meet requirements for forming, draw- the following mill certification physical/ the ASTM A653 specification and is ing, bending, welding and painting mechanical properties. Average yield produced from structural grade steel – conforming to designations and test strength: 42,700 pounds; Average ten- (See Engineering Data.) limits in accordance with provisions of sile strength, 62,600 pounds; Average Rockwell B (RB Value) range: 62 – 74. Produced on Gregory’s own specialty ASTM A653. Modified Sendzimir Hot-Dip Galvanizing Finish ISO CERTS - Quality Control Line, coils are alkaline-cleaned, pickled The silvery matte finish and low reflec- Gregory Industries upholds the highest and galvannealed in one continuous tivity of galvannealed coatings provides industry standards, conforming to and process. excellent weldability and paint-adher- maintaining ISO 9001; 2000 – ANSI/ Galvanneal Zinc Coating Paintability ence properties without special surface ISO/ASQ Q9001-2000 certification for the manufacture and supply of galva- WIZcoat™ galvannealed strut is designed treatment. – Paintable & Weldable Galvanized – nized steel coils. [Certificate # 112358- for superior paint adhesion. The process Galvannealed Coating Specs. 0, registration # 1132-01]. induces an ideal surface that is a zinc (Standard & metric) alloy well suited to painting. The resulting Galvannealed Minimum Minimum Minimum G-STRUT® benefits from this detailed surface forms microscopic crevices that Coating Triple Spot Triple Spot Single Spot QC process. With Gregory’s on-site accept and hold paint better. Designation Total Both Total One Total Both testing lab, physical and mechanical Sides Side Sides properties can be tested in-house. Weldability oz/ft2 or gm/m2 oz/ft2 or gm/m2 oz/ft2 or gm/m2 In addition to monitoring precise The zinc-iron alloy without “free zinc” Standard (Metric) STD. MET. STD. MET. STD. MET. gauge accuracy, coating thickness is on the surface minimizes welding A40 (ZF120) 0.40 120 0.12 36 0.30 90 measured in-line and verified post- fumes, and reduces spot weld prob- production. Precise gauge readings are lems associated with conventional The above table describes the coating designations as well as test limits in accordance with provisions monitored in the slitting process. galvanized product welding. of ASTM A653. Rolled formed products are monitored * Note: A40 is the most common and commercially and tested for conformance to close recommended galvanneal coating. Heavier coatings tolerance standards. are more susceptible to flaking/peeling in bending and forming operations. Green Products Manufacturing Gregory Industries has been in operation for over 100 years…dedicated to the highest Practices at a product standards and performance. Our company is unique among strut manufactur- Glance: ers in that we control the entire strut manufacturing process. G-STRUT® starts with Perfect for post-installation spray painting! • Use of recycled steel mill produced hot-rolled steel master coils…slit the coils in preparation for process- • Recycling of all steel scrap ing…continuous pickle and galvanize on our own specialty line…then roll form and • Lead-free galvanizing in-line punch…on our precision rolling lines. • Use of environmentally-friendly (non-hexavalent) chromium At Gregory our philosophy is straight-forward and simple: • Waste water treatment Furnish the best quality products, with the best of customer service, • Air treatment and at the best possible price. • Low-energy lighting • Recycled heat Gregory Industries, Inc. • 4100 13th Street, SW • Canton, Ohio 44710 Phone 866-997-8788 • Fax 330-477-0626 • www.gregorycorp.com ©Copyright 2012 Gregory Industries, Inc. WC-200Rev212 Oval Slot Long Slot Solid Hole Back to Back Why WIZcoat™ Galvanneal strut? Unlike conventional pre-galvanized or WIZcoat™ Galvanneal strut matches Custom lengths are available to suit the needs of any installation Paintability & Weldability green painted strut channels (which virtually every application. WIZcoat™ of Galvanized Strut Channel are very poorly suited for paint- WIZcoat™ is offered in all standard Galvanneal strut conforms to industry ing); WIZcoat’s zinc coating/finish is profiles and sizes to match the needs standards for structural metal framing WIZcoat™ is a pre-galvanized protec- exposed to a special heat induction of your installation. Styles include steel products. tive zinc coating for carbon steel also step which renders the surface eas- solid, round holes, oval slots and ® known as ‘galvanneal’. Wizard Accessories and Fittings ily paintable, while maintaining the long slots. Back-to-back welded Wizard accessories include clamps, WIZcoat™ Galvanneal strut is de- galvanic protection imparted from the combinations expand installation plates, brackets, fittings, bases and signed specifically for easy paint- bonded, alloyed zinc. possibilities. hardware that provide unlimited creative ability and improved coating adhe- The result is enhanced aesthetics combinations for secure installation. sion without the need for expensive and corrosion protection in visible Hardware is standard electro-galvaniz- & labor intensive pretreatments locations. ed finished. Other custom strut finishes and/or primers. As an added ben- include hot-dip galvanized, powder efit, galvanneal coated steel pos- WIZcoat™ is especially well-suited coated, stainless steel, aluminum, sesses improved spot-weldability. for strut channel applications where spray or dry-fall painting is copper plated, PVC coated and performed post installation. yellow-zinc coated. Strut Channel Technical Detail Untreated “spalling” or rust corrosion Painted Steel with under-film corrosion Galvanized - layer of free zinc and alloy Galvanneal - alloy to surface Galvanneal - paintability without pretreat The Nature of Steel Strut air air air air paint Carbon Steel air paint free zinc iron-zinc Carbon steel is universally considered corrosion corrosion iron-zinc iron-zinc alloy alloy alloy the commercial material of choice for steel steel steel steel high strength, formable, cost-effective steel industrial products. Metal Framing Strut is roll-formed and punched into a versatile product that stands the test of time and stress. Bare carbon steel, however, has one distinct disadvantage, in that it easily Options for Protecting Carbon Steel Strut Pre-Galvanizing Galvanneal corrodes or oxidizes even in minor general atmospheric conditions. Painting Zinc Hot-dipped pre-galvanizing Hot-dipped pre-galvanneal Painting would appear to be a logical, Zinc is an elemental metallic coating that, In this process, the flat steel strip is (WIZcoat™) Steel Corrosion aesthetic choice. Paint is a good “bar- when bonded to steel, possesses the quickly passed through a molten zinc By subjecting the pre-galvanized strip The WIZcoat™ Galvanneal surface is mat- The corrosion of steel is an ‘electrochemi- rier” or “topical” coating that can shield best of all worlds – barrier protection and bath and the zinc is bonded into the to additional heat induction, the layer of ted silver gray in appearance. Microscopi- cal reaction’ in which the steel, when the steel from the elements. Painting galvanic protection. Galvanic protection is surface of the steel. The result is a thicker, ‘free zinc’ is effectively extended into an cally, the surface has cracks and crevices, exposed to oxygen via moisture, reacts alone, however, has inherent weaknesses. an ‘electrochemical reaction’ whereby even ductile layer of ‘free’ or pure zinc on the iron-zinc alloy all the way to the surface which provide for excellent paint adhe- to form an Iron Oxide alloy. The result- Atmospheric exposure and breaches from the exposed steel is protected from corro- surface and a very thin alloy layer of zinc of the steel. The resulting product retains sion without the need for pre-treatment ing ‘red rust’ combination of the iron general wear and tear will weaken paint’s sion. The zinc coating very slowly oxidizes and iron – completing the ‘circuit’ for the desired ‘galvanic protection’ while (chemical etching, shot blasting). In salt and oxygen produces a non-protective barrier and attack the metal. The resulting in the presence of moisture, rather than the zinc’s sacrificial metal property. Then the gaining several new properties – most spray tests, painted galvanneal strut surface that, over time, continues to react electrochemical reaction is so prolific that underlying steel. The phenomenon is com- Strut is formed. The resulting product is notably – PAINTABILITY. actually outperforms conventional galva- and actually dissolves the steel. This it will oxidize or ‘eat’ under and ‘bubble monly referred to as galvanic corrosion, in superior in virtually every way to bare or nized. Because strut is commonly spray process of the steel thinning is referred up’ the surface of the paint, a condition which the zinc reacts as a sacrificial metal painted strut. painted post-installation, WIZcoat™ to as ‘spalling’ or ‘spalling off.’ Without referred to as“under-film” corrosion. for the steel. The zinc is consumed during The only real disadvantage is that galva- Galvanneal is the superior alternative. In protection, steel will literally dissolve to the long corrosion
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