Astm a123 a123m standard specification for zinc hot. B487 test method for measurement of metal and oxide coating thickness by. Oct 10, 2001 astm a123 a123m02 standard specification for zinc hotdip galvanized coatings on iron and steel products october 10, 2002 astm international 1. Astm 123a123m specification reflects new coating grades for plate steel, which is now a separate material category from structural shapes, new coating thicknesses for strip and bar, and a new column for steel thickness of 58 16 mm for all material categories. Standard specification for zinc hotdip galvanized coatings on iron and steel products1 this standard is issued under the fixed designation a 123a 123m. Madden bolt uses a proprietary adherence process that meshes our zinc coating with the steel product for. The batch hot dip galvanized coating is described as the coating mass gm 2 or thickness m or commonly stated as microns on a single surface. Most standards state a minimum thickness for galvanizing, and no maximum. This specification has been prepared by the galvanizing industry through its technical working group, in consultation with industry and a number of consulting engineering groups. Nonmagnetic coatings on magnetic basis metals1 this standard is issued under the. All coating thickness requirements in specification astm a123 a123m, tables 1 and 2, are minimums.
Astm a123 a123m zinc coatings on iron and steel products this specification covers the requirements for zinc coating galvanizing by the hotdip process on iron and steel products made from rolled pressed and forged shapes, castings, plates, bars, and strips. In atmospheric environments, the time to first maintenance of hotdip galvanized steel is directly proportional to the thickness of the hotdip galvanized coating. For small projects less than 20 tons, it is not likely that the fabricator has the selectivity to order steel of speci. The requirements listed in astm a123 a123m include coating thickness, finish, appearance, and adherence. Astm f2329 covers the requirements for hotdip zinc coating applied to carbon steel and alloy steel bolts, screws, washers, nuts, and special threaded fasteners applied by the hotdip coating process. Astm a123 and g90 specifications american galvanizers. For a unit of product whose surface area is equal to or less than 160 in. Astma153 standard specification for zinc coating hotdip. This specification covers the standard requirements for hotdip galvanized zinc coatings on iron and steel products made from rolled pressed and forged shapes, castings, plates, bars, and.
Astm a123 a123m 17 standard specification for zinc. Once again, the service life will be a function of the environment that the coating is exposed to. The requirements for astm a153a153m are very similar to those stated earlier for astm a123 a123m, except for the addition of threaded products and embrittlement requirements. Oct 10, 2001 astm a123 a123m01 standard specification for zinc hotdip galvanized coatings on iron and steel products october 10, 2001 astm international 1. A reproduction and summary of the table given in astm a153 a153m, table.
The coating weight increases with material thickness. Astm a153 for hardware american galvanizers association. If something has been hot dipped galvanized does that mean that it has been done in accordance with the astm 153 or astm a123 affil. Material category, all tested samples thickness measured in mm in. Standard test method for measurement of coating thicknesses. Standard coating thickness according to astm a123 a123m. Standard test method for measurement of metal and oxide coating thickness by microscopical examination of cross section1 this standard is issued under the. The coating thickness on any surface will be at least 5 times the thickness and service life of a g90 coating.
Standard test method for measurement of metal and oxide. Average minimum thickness of the coating by material category. The hotdip process requirements for astm a123 a123m are based on coating thickness, finish, appearance and adherence for iron and steel products. Astma123 standard specification for zinc hotdip galvanized coatings on iron and steel products astm a123 2017 edition current see the following. Corrosion protection hot dip galvanizedastm a153 vs b633. Astm a123 a123m02 standard specification for zinc hotdip galvanized coatings on iron and steel products. Zinc hotdip galvanized coatings on iron and steel products1. Materials and coatings available for wood construction. Or is there other standards that can be looked at in relation to being hot dipped galvanized.
Because the coating thickness is determined by thickness of steel and steel chemistry, galvanizers have little, if any, control over the thick ness of the coating obtained. Both specifications require the use of a knife test to determine proper coating adherence. Astm a123 a123m 09 standard specification for zinc. Astm a 153 zinc coating on iron and steel hardware. Astm a123 a123m 17 standard specification for zinc hot. Service life is defined as the time to 5% rusting of the steel surface. The standard requires a strong level of adherence throughout the service life of the galvanized steel. But g164 has its own test procedures for the weakening of the base layer, a123 refers to the most complete guide of the astm a143 standard, which gives the details of a bending. Materials galvanized per astm a153 class b require an average weight of zinc coating to be 2. For standard structural shapes and plates, astm a123123m requires a minimum average coating thickness of 3.
Astm a123 a123m17, standard specification for zinc hot dip galvanized coatings on iron and steel products, astm international, west conshohocken. A123 a123m17 standard specification for zinc hot dip galvanized coatings on iron and steel products hotdip galvanizing zinc coating steel plates steel strips steel bars steel forgings zinccoated steel products. The result is a pure zinc coating best suited to mild indoor exposures. The coating grade is defined as the required thickness of the coating and is given in microns. Astm a123 covers the requirements for zinc coating galvanizing by the hotdip process on iron and steel products made from rolled pressed and forged shapes, castings, plates, bars, and strips. Astm a123 for structural steel american galvanizers association. Astm a123, standard specification of zinc hotdip galvanized coatings on iron and steel products, refers to products fabricated and then hotdip galvanized. In most cases it is easier to measure the thickness of the coating, but the historical way of specifying the coating is by a mass designation. New changes to astm a123 american galvanizers association.
Th e batch hotdip galvanizing process, also known as general galvanizing, produces a zinc coating on iron and steel products by immersion of the material in a bath of liquid zinc. Astm a123 a123m17 revises and replaces astm a123 a123m15. Thickness or weight of zinc coating for various classes. Astm a123 or astm a153 and astm a385 2 is it practical to specify steel of certain chemistry in order to better control the coating thickness and appearance. A123 a123m17 standard specification for zinc hotdip galvanized coatings. Astm b487 standard test method for measurement of metal and oxide coating thickness by microscopical examination of cross section published by astm on february 22, 1985 this test method covers measurement of the local thickness of metal and oxide coatings by the microscopical examination of cross sections using an optical microscope. E376 practice for measuring coating thickness by magneticfield or eddycurrent electromagnetictesting methods 1 this speci. Galvanizing thickness measurement resources defelsko. Standard test method for measurement of coating thicknesses by the magnetic method. Coating thickness weight dependent upon material category and steel thickness.
Astm a123 a123m09, standard specification for zinc hot dip galvanized coatings on iron and steel products, astm international, west conshohocken, pa, 2009. This specification covers the requirements for zinc coating galvanizing by the hotdip process on iron and steel products made from rolled pressed and forged shapes, castings, plates, bars, and strips. Astm a123 a123m 17 standard specification for zinc hotdip. While the steel is in the kettle, the iron in the steel metallurgically reacts with the molten zinc to form a tightlybonded alloy coating that provides superior corrosion protection to steel. Astm a123 a123m zinc coatings on iron and steel products. Specifying and detailing for hotdip galvanizing aisc. The minimum average coating thickness grade for any specimen shall be one coating grade below that required for the appropriate material category and thickness in table 1.
This specification is for hotdip galvanizing steel sheet using the continuous highspeed galvanizing process. It is intended to be applicable to fasteners that are centrifuged or otherwise handled to remove excess zinc. Specifications frontier hot dip galvanizing buffalo, ny. Materials galvanized per astm a123 can be used to specify zinc coatings up to 2.
The following bibliographic material is provided to assist you with your purchasing decision. Coating thickness weight depends on the material category and steel thickness, values are listed in table 3. B487 test method for measurement of metal and oxide coating thickness by microscopical examination of cross section. The equivalent aashto specification to astm a153 is aashto m232. Astm e 376 standard practice for measuring coating thickness by magneticfield or eddycurrent electromagnetic examination methods. Astm a123 a123m, standard specification for zinc hot dip galvanized coatings on iron and steel products, astm international, west conshohocken, pa, 20. Astm a123 hot dip galvanized pipe elbows,astm a123 hot dip.
Astm 123a123m specification reflects new coating grades for plate. The link below is a service life chart showing the coating life versus coating thickness for a hot dip galvanized astm a123 coating. Astm a123 is a related hotdip galvanizing specification covering iron and steel products made from rolled and pressed shapes, castings, plates, bars, and strips. The astm a123 a123m17 document details specifications for materials, including the steel or iron, zinc, and bath composition, and coating properties, such as the coating thickness, finish, and appearance. Sep 03, 2019 the astm specifications a143a143m, astm a384a384m, and astm a385 provide guidelines for preparing products for hotdip galvanizing. Astm a123a123m15 standard specification for zinc hotdip. Astma123standardspecificationforzinccoatingsoniron. In addition, it addresses sampling and test methods to assure that the zinc coating is being furnished properly. But there is a practical maximum, defined by physical things that happen when coating is thick, or by the cost of obtaining a thick coating.
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