ASTM A/AM. Standard Specification for Zinc-Coated (Galvanized) Steel Bars for Concrete Reinforcement is exclusively applicable to hot-dip galvanizing . ASTM A/AM: Standard Specification for Zinc-Coated (Galvanized) Steel Bars for Concrete Reinforcement. ASTM A/AMa Testing Mechanical Splices for Steel Reinforcing Bars .. ASTM A/AM Zinc-Coated (Galvanized) Steel Bars for Concrete.
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ASTM A767/A767M – 16
They can only be used if the electrical conductivity of the coating differs significantly from that of the substrate. First, the specification details the coating thickness requirements based on bar size.
This tubing shall be produced in both welded and seamless sizes and must have the chemical requirements of carbon, manganese, phosphorus, sulfur, and copper. Requirements concerning the renovation of uncoated areas asttm initial hot-dip galvanizing are contained within the material specifications A, A, A Eddy-current-type thickness measurement is a non-destructive test measuring variations in the impedance of an eddy-current inducing coil caused by coating thickness variations.
Number 12 and smaller bar must have a minimum of 3.
The requirements for finish, appearance, and adherence are identical to those in the other main standards. However, the AGA does provide a compilation of specifications pertinent to galvanizing.
These notes and footnotes excluding those in tables shall not be considered as requirements of the specification. This cold working of the bars causes induced stresses that may be released after the bars are immersed in the molten F zinc bath.
This practice is applicable to chromate coatings of the colorless both one and two-dipiridescent yellow or bronze, olive drab, black, colorless anodic, yellow or black anodic types, and of the dyed variety, when applied to surfaces of electrodeposited zinc, mechanically deposited zinc, hot-dipped zinc, rolled zinc, electrodeposited cadmium, or mechanically deposited coatings.
The adherence requirement is the same as A, for strong bond throughout the life of the hot-dip galvanized steel. This specification covers the requirements for hot-dip zinc coating applied to carbon steel and alloy steel bolts, screws, washers, nuts, and special threaded fasteners applied by the hot-dip coating process. The following is a summary of the various pertinent hot-dip galvanizing specifications. The values stated in each system may not be exact equivalents.
Any combination of these products can be assembled into a single fabrication and then hot-dip galvanized. The mass of the coating shall be determined by magnetic thickness gage measurements. LME grade, special high grade, high grade, intermediate grade, and prime western grade. All fabricated assemblies shall be designed with vent and drain holes such that no air is trapped during immersion of the assemblies into cleaning solutions or molten zinc.
Types of embrittlement commonly encountered with galvanized steel are related to aging phenomena, cold working, and absorption of hydrogen.
The requirements in the specification facilitate the production of a high-quality zinc coating and are similar to those found in A and A It is important to note reinforcing steel used in conjunction with structural steel, welded to a fabricated assembly is not governed by ASTM A but rather Astn A, the standard specification for zinc coatings on iron and steel products.
The galvanized coating shall be chromate treated. This specification covers rolled steel structural shapes for use in building framing or bridges, or for general structural purposes.
ASTM Specifications | American Galvanizer’s Association
Whenever different analyses of steel or different surfaces of steel are united in an assembly the galvanized finish is not generally uniform in appearance. Link to Active This link will always route to the current Active version of the standard. Historical Version s – view previous versions of standard. Specification for Structural Steel.
The material provided herein has been developed to provide accurate and authoritative information about after-fabrication hot-dip galvanized steel. The requirements of this specification are very similar to those in A, except for the addition of threaded products and embrittlement requirements. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
KnowledgeBase What is EN ? The purpose of the calculation is to provide justification for the purchase of a higher initial cost system with a low life-cycle cost over an initially less expensive coating which has high future costs.
Common distorted and warped members of assemblies are sheets or plates assembled by welding or riveting. The design of the product and selection of proper steel for its suitability to withstand normal galvanizing operations is the responsibility of the designer and fabricator. Rebar is commonly bent prior to galvanizing, and the recommendations for diameter and best practices are provided in A Standard Specification for Zinc Coating Hot-Dip on Iron and Hardware applies to hardware products such as castings, fasteners, rolled, pressed, and forged products, and miscellaneous threaded objects that will be centrifuged, spun, or otherwise handled to remove the excess zinc.
Embrittlement is the loss or partial loss of ductility in a steel where an embrittled product characteristically fails by fracture without appreciable deformation. Practice for Repair of Damaged and Uncoated Areas of HOt-Dip Galvanized Coatings covers appropriate methods used to repair damaged hot-dip galvanized coatings on hardware, structural shapes, and other hot-dip galvanized products, including uncoated areas remaining after initial hot-dip galvanizing. This specification covers prime western grade-recycled PWG-R zinc made by recycling zinc secondary materials including but not limited to drosses and skimmings.
January 25, Authored by Dr. Stripping method, weighing before and after galvanizing, and microscopy method shall be used to referee the results obtained by magnetic thickness measurements.
It may also be known by its trade name, e. Combining values from the two systems may result in non-conformance with this specification.
ASTM A – Galvanizing Steel Bars | American Galvanizer’s Association
However, if the galvanizer has to perform additional work in order to prepare the product for hot-dip galvanizing, such as drilling holes to facilitate drainage or venting, the galvanizer will asfm and resolve the issue with the customer.
If rebar is bent fabricated after the galvanized coating is applied and any flaking or cracking occurs, it is not rejectable. This abstract is a brief summary of the referenced standard. Steel materials a7677 nuts shall be manufactured, processed, and formed as appropriate for their respective grades.
The information provided herein is not intended as a representation or warranty on the part of the AGA. Heat analysis shall be used to determine the percentage of carbon, manganese, phosphorus, sulfur, vanadium, nickel, chromium, molybdenum, columbium, and copper for the required chemical a7677. Leave this field blank.
Galvanization shall be used to prepare reinforcing bars.
ASTM A767 – Galvanizing Steel Bars for Concrete Reinforcement – Rebar
A retest shall be provided if the average zinc coating mass fails to meet the requirements. Fabrications can have more than one material category, such as a frame assembly.
Historical Version s – view previous versions of standard Work Item s – proposed revisions of this standard Translated Version s: Purchase a copy from the AGA, or contact your local galvanizer.
This specification covers zinc metal made from ore or other material by a process of distillation or by electrolysis in five grades as follows: