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.
The galvanizer is identified throughout this specification as the manufacturer. 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. This specification covers the requirements for hot-dip zinc coating applied to carbon steel adtm alloy steel bolts, screws, washers, nuts, and special threaded fasteners applied by the hot-dip coating process.
ASTM A – Galvanizing Steel Bars | American Galvanizer’s Association
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 ashm, structural shapes, and other hot-dip galvanized products, including uncoated areas remaining after initial hot-dip galvanizing.
There are coating thickness minimums, but no maximums, and the threads are not subject to the coating thickness requirement. Steel materials and nuts shall be manufactured, processed, and formed as appropriate for their respective grades.
Unique to this specification is also the requirement the galvanized bars astn immersed in a heated, sodium dichromate solution immediately after the process.
LME grade, special high grade, high grade, intermediate grade, and prime western grade. This specification covers carbon structural steel shapes, plates, and bars of structural quality for a77 in riveted, bolted, or welded construction of bridges and buildings, and for general structural purposes.
See Specifying Duplex Systems for more information.
ASTM Specifications | American Galvanizer’s Association
The specification outlines three acceptable forms of touch-up: Anyone making use of this information assumes all liability arising from such use. All fabricated assemblies shall be designed with vent and drain holes such that no air is trapped during zstm of the assemblies into cleaning solutions or molten zinc. If rebar is bent fabricated after the galvanized coating is applied and any flaking or cracking occurs, it is not rejectable.
This a7767 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 following is a summary of the various pertinent hot-dip galvanizing specifications. Leave this field blank. Whenever different analyses of steel or different surfaces of steel are united in an assembly the galvanized finish is z767 generally uniform in appearance.
The galvanized coating shall be chromate treated. Types of embrittlement commonly encountered with galvanized steel are related to aging phenomena, cold working, and absorption of hydrogen. This specification covers steel reinforcing bars with protective zinc coatings applied by dipping the properly prepared reinforcing bars into a molten bath of zinc. This cold working of the bars causes induced stresses that may be released after the bars are immersed in the molten Asym 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.
Any combination of these products can be assembled into a single fabrication and then hot-dip galvanized. However, the AGA does provide a compilation of specifications pertinent to galvanizing. The values stated in each system may not be exact equivalents. Stripping method, weighing before and after galvanizing, and microscopy method shall be used to referee the results obtained by magnetic thickness measurements.
This tubing shall be produced in both welded and seamless sizes and must have the chemical requirements of carbon, manganese, phosphorus, sulfur, and copper.
A retest shall be provided if the average zinc coating mass fails to meet the requirements. They can only be used if the electrical conductivity of the satm differs significantly from that of the substrate. Standard Specification for Zinc. Assemblies should consist of elements of similar chemistry and surface condition.
The specification requirements for coating thickness only contain minimums, there is no maximum coating thickness limitation in the specification. However, there are a few additional requirements for galvanized rebar. KnowledgeBase What is EN ? Therefore, each system shall be used independently of the other. This specification covers black and hot-dipped galvanized hot-formed welded and seamless carbon steel square, round, rectangular, atm special shape structural tubing for welded, riveted, or bolted construction or bridges and buildings, and for general structural purposes.
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.
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.