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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The following is a summary of the various pertinent hot-dip galvanizing specifications. This tubing z767 be produced in both welded and seamless sizes and must have the chemical requirements of carbon, manganese, phosphorus, sulfur, and copper.
The galvanizer shall be permitted to subject the newly coated steel reinforcing bars to air or steam wiping to remove excess zinc from the bars. KnowledgeBase What is EN ? January 25, Authored by Dr. Specification for Structural Steel.
A retest shall be provided if the average zinc coating mass fails to meet the requirements. ASTM A 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.
See Specifying Duplex Systems for more information. This specification a76 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. 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.
Types of embrittlement commonly encountered with galvanized steel are related to aging phenomena, cold working, and absorption of hydrogen. Fabrications can have more than one material category, such as a frame assembly. However, there are a few additional atsm for galvanized rebar. The information provided herein is not intended as a representation or warranty on the part of the AGA.
ASTM A767/A767M – 16
Leave this field blank. 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. The following can cause warpage and distortion: This post-treatment helps to prevent the formation of wet storage stain on asm bars when they are in bundles at a job site and also promotes good adhesion of the galvanized rebar to the concrete it is placed in.
It is the responsibility of the designer and fabricator to ensure the product has q767 properly designed and built before the hot-dip galvanizing process supporting specifications.
ASTM A767 – Galvanizing Steel Bars for Concrete Reinforcement – Rebar
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Purchase a copy from the AGA, or contact your local galvanizer. 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 ASTM A, the standard specification for zinc coatings on iron and steel products. 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 communicate and resolve the issue with the customer.
The requirements of this specification are very similar to those in A, except for the addition of threaded products and embrittlement requirements.
The material categories covered in the specification include structural steel and plate, strips and bars, pipes and tubing, and wires. This specification covers steel reinforcing bars with protective zinc coatings applied by dipping the properly prepared reinforcing bars into a molten bath of zinc.
Combining values from the two systems may result in non-conformance with this specification. They can only be used if the electrical conductivity of the coating differs significantly from that of the substrate. The adherence requirement is the same as A, for strong bond throughout the life of the hot-dip galvanized steel. A requires a continuous, smooth, and uniform finish with no uncoated areas including on the threads or issues that interfere with its intended use.
The requirements for finish, appearance, and adherence are identical to those in the other main standards.
This specification covers zinc metal made from ore or other material by a process of distillation or by electrolysis in five grades as follows: This test method shall determine the effects of surface preparation or condition such as bar coatings on the bond strength of deformed steel reinforcing bars to concrete. The values stated in each system may not be exact equivalents. The specification outlines three acceptable forms a677 touch-up: The material provided herein has been developed to provide accurate and authoritative information about after-fabrication hot-dip galvanized steel.
The specification requirements for coating thickness only contain minimums, there is no maximum coating thickness limitation in the specification. Inspector Listing – Non-U. 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 composition.
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. Assemblies should consist of elements of similar chemistry and surface condition. This specification covers rolled steel structural shapes for use in building framing or bridges, or for general structural purposes. Historical Version s – view previous versions of standard Xstm Item s – proposed revisions of this standard Translated Version s: This cold working of the bars causes induced stresses that may be released after the bars are immersed in ashm molten F zinc bath.
The requirements in the specification facilitate the production of a high-quality zinc coating and are similar to those found in A and A Standard 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.
ASTM A – Galvanizing Steel Bars | American Galvanizer’s Association
This abstract is a brief summary of the referenced standard. Practice for Repair of Damaged and Uncoated Areas of HOt-Dip Galvanized Coatings covers appropriate methods used asm 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.
The mass of the coating shall be determined by magnetic thickness gage measurements. Embrittlement is the loss or partial loss of ductility in a steel where an embrittled product characteristically fails by fracture without appreciable deformation. The specification also calls out specific recommended before galvanizing bending radii.
Unique to this specification is also the requirement the galvanized bars be immersed in a heated, sodium dichromate solution immediately after the process.
Common distorted and warped members of assemblies are sheets or plates assembled by welding or riveting. Historical Version s – view previous versions of standard.