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 requirements of this specification are very similar to those in A, except for the addition of threaded products and embrittlement requirements. A requires a continuous, smooth, and uniform finish with no uncoated areas including on the threads or issues that interfere with its intended use.
Steel materials and nuts shall be manufactured, processed, and formed as appropriate for their respective grades. The following can cause warpage and distortion: The material provided herein has been developed to provide accurate and authoritative information about after-fabrication hot-dip galvanized steel.
Common distorted and warped members of assemblies are sheets or plates assembled by welding or riveting. Types of embrittlement commonly encountered with galvanized steel are related to aging phenomena, cold working, and absorption of hydrogen.
ASTM A767/A767M – 16
The requirements for finish, appearance, and adherence are identical to those in the other main standards. 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. This cold working of the bars causes induced stresses that may be released after the bars are immersed in the molten F zinc bath.
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. Assemblies should consist of elements of similar chemistry and surface condition. The design of the product and selection of proper steel for its suitability to withstand normal galvanizing operations sstm the responsibility of aztm designer and fabricator. The mass of zinc coating shall conform to specified requirements. Stripping method, weighing before and after galvanizing, and microscopy method shall be used to referee the results obtained by magnetic thickness measurements.
First, the specification details the s767 thickness requirements based on bar size. Finally, there are requirements for passivating the material xstm to prevent reaction a77 concrete and the zinc coating, and on bend diameters. This specification covers rolled steel structural shapes for use in building framing or bridges, or for general structural purposes. Standard Specification for Zinc Coating Hot-Dip on Iron and Hardware applies to hardware products such as castings, a7767, rolled, pressed, and forged products, and miscellaneous threaded objects that will be centrifuged, spun, or otherwise handled to remove the excess zinc.
LME grade, special high grade, high grade, intermediate grade, and prime western grade. Inspector Listing – Non-U. A retest shall be provided if the astj zinc coating mass fails to meet the requirements. Link to Active This link will always route to the current Active version of the standard.
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.
KnowledgeBase What is EN ? 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.
Specification for Structural Steel. The information provided herein is not intended as a representation or warranty on the part of the AGA. This specification covers the chemical, mechanical, and dimensional requirements for eight grades Grades O, A, B, C, D, DH, C3, and DH3 of carbon and alloy steel nuts for general structural and mechanical uses on bolts, studs, and other externally threaded parts.
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. The mass of the coating shall be determined by magnetic thickness gage measurements. Number 12 and smaller bar must have a minimum of 3. The specification also calls out specific recommended before galvanizing bending radii. It may also be known by its trade name, e.
This post-treatment helps to prevent the formation of wet storage stain on the 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. However, there are a few additional requirements for galvanized rebar.
This material provides general information only and is not intended as a substitute for competent professional examination and verification as to suitability and applicability. Any combination of these products can be assembled into a single fabrication and then hot-dip galvanized.
The requirements in the specification facilitate the production of a high-quality zinc coating and are similar to those found in A and A This specification covers zinc metal made from ore or other material by a process of distillation or by electrolysis in five grades as follows: These notes and footnotes excluding those in tables shall not be considered as requirements of the specification.
This specification covers cold-formed welded and seamless carbon steel round, square, rectangular, or special shape structural tubing for welded, riveted, or bolted construction of bridges and buildings, and for general structural purposes.
Finally, the adherence requirement is for asfm entire coating to have a strong adherence throughout the service life of the galvanized steel. See Specifying Duplex Systems for more information.
Fabrications can have more than one material category, such as a frame assembly. This specification covers steel reinforcing bars with protective zinc coatings applied by dipping the properly prepared reinforcing bars a7667 a molten bath of zinc.
It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. This specification covers black and hot-dipped galvanized hot-formed welded and seamless carbon steel square, round, rectangular, or special shape structural tubing for welded, riveted, or bolted construction or bridges and buildings, and for general structural purposes.
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 galvanizer shall be permitted to subject the newly coated steel reinforcing bars to air or steam wiping to remove excess zinc from the bars. The material categories covered in the specification include structural steel and plate, strips and bars, pipes and tubing, and wires.
They can only be used if the electrical conductivity of the coating differs significantly from asfm of the substrate. Anyone making use of this information assumes all liability arising from such use.
ASTM A – Galvanizing Steel Bars | American Galvanizer’s Association
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. The following is a summary of the various pertinent hot-dip galvanizing specifications. Within the text, the SI units are shown in brackets.