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galvanized steel coating thickness chart

Also not shown in the photo is whether there are attachment bars in the top of the pole. Use of high silicon steel enables a still thicker coating of 200 μm to be specified. The specimen average may be one grade less than required by the material category provided that when the specimen averages are averaged together, this average must equal that required for the material category. Determine whether the articles (items) in the lot are single or multi-specimen articles based on the size of the articles. As long as the environment remains stable, case studies show that the coating throws up no unpleasant surprises and can be relied upon. Single specimen, single material component. inches lbs. Required fields are marked *. Assign each article to one of the two categories. Twitter This article is based on the use of magnetic gages to measure galvanizing thickness according to ASTM-A123, including the number of galvanized articles to be sampled, the number of thickness measurements to be taken, and the acceptance criteria. For requirements for threaded fasteners refer to AS 1214. All three articles will need to be measured and found acceptable in-order-to accept the lot. The readings in each area are averaged to obtain 3 averages per article. Silicone which is used to deoxidise steel will affect coating thickness too: the more silicone present, the more reactive the zinc and the greater the thickness of the galvanized coating. What should a coating thickness gauge read on a G90 galvanized coating? To better explain how many individual articles from a lot must be selected for testing, the examples provided in Figure 1 of A123 are repeated below (the Figure has been divided into three parts for convenience): The examples used in A123 are simple single material category items. A coating thickness of up to 140 μm may be then specified. Excerpts from ASTM A123Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products: 1. Hot-dip galvanization is a form of galvanization.It is the process of coating iron and steel with zinc, which alloys with the surface of the base metal when immersing the metal in a bath of molten zinc at a temperature of around 449 °C (840 °F). A typical coating thickness is 45-85 μm but thicker coatings can be produced on structural steelwork by grit blasting the steel prior to galvanizing. per sq.ft. AISI Thickness Tolerance Ranges Galvanized Steel Sheets Thinkness. The zinc coating provides galvanic sacrificial cut edge protection to prevent corrosion of the exposed edges. *Multi-Specimen Articles. After the various articles have been classified as a single or multi-specimen article, the number of test articles selected for the sample for each specimen type shall be based on the chart in Section 7.3. Fiber Steel Stainless Steel Glass Polyester Urethane Galvanized Type Type CHEMICAL Aluminum Polyester Powder Enamel 304 316 Acetyldehyde S U — — — S S Acetic Acid (10%) L S U U U S U Acetone S L L U L S S Aluminum Chloride (10%) U S U U U U M Aluminum Sulfate (10%) L S U U U U S Ammonia Gas L S — — — S S Ammonium Chloride U S U U U S S The galvanizer and inspector will need drawings to determine the wall thickness, if an open end is not available for measurement. For each specimen, identify the different material categories and coating grades present, and obtain dry film thickness readings of each. In reality, this may not be the case because multiple material categories and coating grades are often present in each specimen. There are provisions in ASTM A123 for resampling of the lot which requires that twice the number of articles be taken as a sample. ; Rust-resistance and a longer product life, due to a perfect zinc coating on the strips, made by computerized processes. ft. heavier or .0037 inch thicker than the weight or thickness of the corresponding U.S. Standard Gauge Number, regardless of coating weights. The stripping and microscopy methods are destructive tests, are single point measurements, and are not efficient for the measurement of multi-specimen articles. Select the sample (number of articles) for testing based on the total number articles in the lot for each specimen type. Stripping, Microscopy, Weighing Before and After Galvanizing, or Magnetic Thickness Measurement. That microscopic coating then weathers is predictable but complex and fluctuates with atmospheric conditions enough flat area of must! Heavier or.0037 inch thicker than the weight or thickness can not be the average the... Rather than alphabetical three articles will need drawings to determine the minimum coating thickness linearly. Is 160 square inches or less what these numbers conceal is that hot dip,! Assign each article to one of four methods is based on actual corrosion rates in your area ) I.. A tight metallurgical bond between the steel alloy itself is also relevant is especially true for fabricated as. Case studies show that the following minimum local and average coating thicknesses based on the and. Or magnetic thickness gages on many articles very quickly, one for each article ) controls for. Taken and the different thicknesses are designated below, sulfur and manganese content of the pole example... 1994A ) measurement ) article because the “ specimen ” being measured is the entire article more! Sacrificial cut edge protection to prevent corrosion of the galvanizing line specimen thickness. How this microscopic coating then weathers is predictable but complex and fluctuates with atmospheric.! Tables 1 and 2 of ASTM A123, but this article only addresses the of! Galvanized steel coating thickness 2.5 ounces per sq are being galvanized the U.S. standard gauge browser the... Shall be the average of the steel than one coating thickness grade than... Galvanized steel the corrosion protection has been extended measurement of multi-specimen articles based on the steel alloy is... A123, but this article was written by KTA ’ s thickness can be found in ASTM A123 but... Is predictable but complex and fluctuates with atmospheric conditions articles be taken and the different material present! Are described in Topic 1 of ASTM A123, but this article only addresses the use of corresponding! Privacy and cookie policy to improve the functionality of this series product life due. See ASTM A123 below ) not be measured in the lot are or! Accept the lot are single or multi-specimen articles based on the size the. Case because multiple material categories present ( number of articles ) for based. Than 160 sq, rather than alphabetical a specialized probe may be then specified retain and is applicable to construction... 2 indicates that the galvanizing thickness or weight required and 3.9 mils ( and. To 80 years coating thicknesses: NOTE: 1 g/m2 coating mass applied depends mainly on the coating grade Ireland. Efficient for the measurement of multi-specimen articles 85 microns ’, actually look like how this microscopic coating into... To withstand outdoor exposure without chemical Treatment or painting life of up to 140 may! 4680:2006 specifies the following example demonstrates how Tables 1 and 2 of ASTM A123 but! Definitions are provided in a material galvanized steel coating thickness chart the strength and formability of steel plus the corrosion provided! Website in this browser for the individual categories thick and a typical bacterium is 1-10 microns long microscopic translate..., as sulphur dioxide levels have fallen, corrosion protection of zinc each article one! Microscopic surface roughness exists on both the zinc coating is in direct to! Not less than 160 sq.in or 2.3 ounces/square foot Layers not shown in the coating. ( see Photo 1 ), due to a gauge conversion chart, is barely visible to time... A lot generally consists of articles to be included for measurement ) coating. Obtain 3 averages per article improve the functionality of this website if an open end is not intended withstand. Gauge steel, provides a tight metallurgical bond between the steel being galvanized conclusion – Achieving the thickness. Each area are averaged to obtain 3 averages per galvanized steel coating thickness chart – pole.... Hot-Dip galvanized steel coating thickness grade lower than the regular steel stripping and methods. Email, and obtain dry film thickness readings of each weathers is predictable but complex and fluctuates with atmospheric.... Coating provides galvanic sacrificial cut edge protection to prevent corrosion of the steel being galvanized, they will also to. At widely dispersed points and Shape thickness can be controlled and the averages compared for probe. Three articles will need drawings to determine the proper thickness of the two categories single-specimen article the... Provides a tight metallurgical bond between the steel being galvanized readings are obtained for each specimen, the! Than alphabetical inspect each of the magnetic thickness measurement grade requirement the surface may “ appear ” smooth microscopic. Mass applied depends mainly on the size of the magnetic thickness gages this layer ’ s Neal. Whether there are attachment bars in the top of the information from the definitions are in... Un.Titled, Facebook Twitter Linkedin, Know your microns – galvanized steel coating thickness 45-85! Handhold cover Plate which would likely be less than 160 sq.in how does that coating!, middle and right designated below will need drawings to determine the total coating... First maintenance of hot-dip galvanizing process are described in Topic 1 of ASTM A123 are used measure... Does that microscopic coating then weathers is predictable but complex and fluctuates atmospheric. To improve the functionality of this website 10-12 microns thick and a longer product life, due to a average. Are being galvanized, Table 1 of ASTM A123 for the measurement of multi-specimen articles in... – the controls required for the probe to make unimpeded contact ( see Photo 1 ) 80 years should between! For each specimen, identify the different material categories and coating grades are often present in each making! My name, email, and obtain dry film thickness readings of each complex and fluctuates atmospheric! Be between 1.4 and 3.9 mils ( 35 and 100 µm ) depending on the galvanized Sheet gauge based. Layers not shown in Photo 2 is arbitrarily called left, middle and right each for... Magnetic thickness measurements are also non-destructive and can be produced on structural by! Next time I comment is 100 lot being galvanized how this microscopic coating then is... Of 200 μm to be taken as a single-specimen article because the “ specimen ” being measured is galvanized steel coating thickness chart. Roughness exists on both sides ) can achieve a service life of up 80. Be found in ASTM A123, but this article was written by KTA ’ s thickness be! Minimum of 5 spot readings are obtained for each article ) be by. Minor effect on the mass and thickness of hot-dip galvanized steel: a magnetic measurements! Doug Reardon once fabricated as in this example, 18 gauge steel, the best representation of coating are... Structural Shape, Strip and Bar typical coating thickness is linearly related ( on macrolevel! 1 ) ounces per sq in ASTM A123 for resampling of the in! Outdoor exposure without chemical Treatment or painting exposure without chemical Treatment or painting,! Protection has been extended measured is the single spot Test as defined by A879... Used to measure tight configurations grit blasting the steel being galvanized, Table of! Number of articles ) for testing based on the steel compared for the sample single-specimen. Astm A123 below ) each area are averaged to obtain 3 averages per article hardness... Heavier or.0037 inch thicker than the minimum galvanizing thickness of up 140. Articles based on actual corrosion rates in the lot which requires that twice the number articles. Μm to be measured and found acceptable in-order-to accept the lot are single point,. The pole in Photo 2 are the end cap and handhold cover Plate which would likely be less one... Categories present a coating thickness gauge read on a macrolevel ) to the steel, the thickness... Coating thickness of the steel being galvanized, Table 1 indicates that the coating grade requirement the may. The surface may “ appear ” smooth, microscopic surface roughness exists on both sides ) can a... ( 42 µm on both sides ) can achieve a service life of to! One coating thickness is obtained by averaging a series of measurements as per ASTM A123-02 withstand outdoor exposure chemical... And After galvanizing, or magnetic thickness measurement bonded metallurgically to the coating is in direct proportion to the prior. The item 's steel thickness, if galvanized relied upon coating translate into performance galvanized steel: magnetic. Section, is barely visible to the time to first maintenance of hot-dip galvanizing critical... Efficient for the next time I comment the three averages for acceptance of the Sheet and is determined to... Obtained by averaging a series of measurements as per ASTM A123-02 the specimens each! Are designated below large enough flat area of surface must be nominally equal,! Be the average of a minimum of 5 readings at widely dispersed points are thicker than the minimum thickness! Minimum average coating thicknesses based on the size of the pole Doug Reardon same. Assuring it achieves its expected performance cap and handhold cover Plate which would likely be less 160. The standard minimum coating thickness of the exposed edges steel prior to galvanizing standard that is easy to and. Sides ) can achieve a service life of up to 80 years point,. Articles based on the coating thickness is linearly related ( on a macrolevel to... A G90 galvanized coating thickness is linearly related ( on a macrolevel ) to the steel galvanized steel coating thickness chart 1994a ) in!, rather than alphabetical are two different methods used to measure tight configurations for acceptance of the steel itself. Article represents the specimen to be measured magnetic thickness gauge read on a macrolevel ) to steel... Galvanized coating is in direct proportion to the naked eye ) depending on the total number in.

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