Hot dip galvanizing specification

Is hot dip galvanizing RoHS compliant, really? Can high strength fasteners be hot dip galvanized? Does hot dip galvanizing work for stainless steel? How long does hot dip galvanized metal last?

Hot-dip galvanizing is done in accordance with long established ASTM specifications.

It does not cover threaded fasteners that are centrifuged or otherwise handled to remove excess zinc. When hot dip galvanizing is specifie the surface of the steel is completely covered with a uniform coating whose thickness is determined principally by the thickness of the steel being galvanized (see Graph below). Once considered only as a means of corrosion protection , hot-dip galvanizing is now specified for an array of reasons including lower initial cost, durability, longevity, availability, versatility, sustainability, and even aesthetics. Specification for Zinc ( Hot-Dip Galvanized ) Coatings on Iron and Steel Products, covers individual steel pieces as well as assemblies of various classes of material. The material categories covered in the specification include structural steel and plate, strips and bars, pipes and tubing, and wires.

Hot Dip Galvanizing Specification. ASTM standard practices A14 A3and A 3should also be observed so that a high quality coating can be achieved. Low – lead galvanizing as required under coating specification.

Hot - Dip Galvanizing By Philip G. Rahrig and John Krzywicki AN OVERVIEW FOR ENGINEERS, ARCHITECTS, AND DETAILERS Specifying and Detailing for H igh quality galvanized coatings are obtained when steel assemblies are designed to promote un-restricted flow of cleaning solutions and molten zinc during the hot - dip galvanizing process. This applies to steel forgings and iron castings that are galvanized in batches or separately including large hollow sections that are bent or welded before galvanizing as well as wire work that has been fabricated from un-coated steel wire. The hot dip Galvanizing process The galvanizing process consists of three basic steps: surface preparation, galvanizing and in-spection. SURFACE PREPARATION Surface preparation is the most important step in the application of any coating. The European and International standard covering post-fabrication hot dip galvanizing of steelwork I. This specification covers zinc coatings applied by the hot - dip process on iron and steel hardware.

Be fully prepared for the design and integration of corrosion protection in your next project. Hot-Dip Galvanizing The coating process involves completely immersing the bolts in a tank containing tons of 840°F molten zinc. The material will remain in the tank until the zinc has metallurgically bonded to the steel. This time varies depending on the diameter, steel grade, and a number of other factors. Technical Requirements for hot dip galvanizing of steel for overhead lines and substations.

Scope These requirements apply to hot dip galvanizing of steel for overhead lines and outdoor substations. The steel refered to is: 1. Rolled steel section, eg. L-section, sheet, round bar, I-section 2. Galvanizers Association can provide detailed advice on compiling your specifications, as well as reviewing design details to maximise the benefits of galvanizing your steel.

Any hot - dip Galvanized steel pipe needs, contact us for more details. There are a number of Standards referenced in Australia dealing specifically with galvanizing including batch hot dip galvanizing. The most important Standards are listed below.

There are many more local and international Standards that cover different aspects of hot dip galvanizing and zinc coatings.