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However, csaa information presented here can adequately describe some of the key differences between the two. Some differences exist between the two with regard to piping and continuous galvanizing, but after examination, the same information is indicated within each specification.
CSA CAN/CSA-G164-M92 – Hot Dip Galvanizing of Irregularly Shaped Articles
Most galvanizers located in North America use this specification as the standard for coating thickness, appearance, finish and adherence. ASTM A is listed as the standard for renovation by each specification. ASTM A has a more realistic expectation that the coating be free of uncoated areas, bubbles, flux deposits, and matte. Few requirements are given by G concerning the appearance of the zinc coating.
It has lost relevancy in the market and is seldom used. The most significant difference here is with regard to the minimum coating thickness required by the A for pipes and tubes and for flats and bars. Also, A has no requirements as to the minimum coating thickness on threaded fasteners and items, but refers to ASTM A for these requirements.
Some slightly different language exists between the two regarding piping and continuous galvanizing, but when read carefully, the same information is being stated in the scope of each specification. The sampling procedure laid out in G for testing the coating thickness has some very general and relaxed guidelines. Both specifications also require the bare spot to be less than 0.
The percentage by weight and the percentage by mass differ only in verbiage and describe the same amount. This leads to less confusion during the galvanizing process and creates a complete specification. Recent reports have shown that much thicker coatings than these minimum requirements are not feasible on these materials. Table 1 of ASTM A has requirements for structural forms, strips and bars, plates, pipes and tubes, wires and rebar.
The framework of these two specifications, and therefore their goal, is almost identical.
CAN/CSA-GM92 (R) | Standards Council of Canada – Conseil canadien des normes
The practice behind each method varies from one specification to the other, but the most notable differences are the feeler gauge, magnetic and electronic measurements. However, G gives its own procedures for testing for embrittlement of the base coating while A references a complete guide of ASTM A which details a bend test. The scope of these two specifications, and therefore their intended purpose, are nearly identical.
This creates less confusion during the galvanizing process and a more complete specification.
Standards Council of Canada
Each standard lists the same tests used to determine the coating thickness on galvanized steel; electronic or magnetic gauge, weigh galvanize weigh, weigh strip weigh or microscopy methods.
But due to financial considerations, CSA G has not been updated since and there seem to be no plans to do so. The first major difference between the two specifications comes when section 3. The main difference here is the refusal to accept the presence of matte particles adhering to the coating, according to G The procedure includes the option to choose the number of samples cea on the number of parts in the lot g146 the length and size of the parts.
However, the g146 presented here may adequately describe some of the major differences between the two. It is considered the standard of the hot-dip galvanizing industry in North America. Perhaps the most obvious and important difference between these standards is how relevant each one is in todays market. But G has its own test procedures for the weakening of the base layer, A refers to the most complete guide of the ASTM A standard, which gives the details of a bending test.
Each specification standardizes the coating thicknessfinish, appearance, and adherence of a hot-dip galvanized coating. New information and research are constantly taken into account when updates are made to ASTM A; the last update was in The standard requires that the coating be free of imperfections such as bubbles, rough or uncoated areas, acid, black spots, or slag particles adhering to the coating However, there are some competing specifications that are worthy of consideration when an end user requests that the galvanizer use them.
Differences Between ASTM A and… | American Galvanizer’s Association
The most notable difference here is in regard to the minimum coating thickness required by A for pipe and tubing as well as for strip and bar. Both specifications also contain a slight difference with respect to the repair of uncoated areas during the galvanizing process.
A, on the other hand, only requires the average coating thickness measurement meet the minimum coating thickness required by Table 1, with the average of one specimen being one coating grade below that required in Table 1. Is CSA G still a valid specification?
The higher purity required by G creates the difference in the two specifications. The material provided herein has been developed to provide accurate g1164 authoritative information about after-fabrication hot-dip galvanized steel. ASTM A also declares, in addition to the 0. This standard has lost its relevance in the market and is b164 used. The practice behind each one of these methods varies from one specification to the next, but the most notable differences are that of the magnetic and electronic xsa gauge measurements.
Recent information has shown coatings much thicker g1664 these minimum requirements are not attainable on these materials. Also, A does not give requirements for the minimum coating thickness on fasteners and threaded articles but references ASTM Cs for these requirements.
Despite this, G lumps this material in with all other materials and requires unattainable thicknesses for strip, bar, pipe, and tubing.
Table 1 of ASTM A has requirements for structural shapes, strip and bar, plate, pipe and tubing, wire, and reinforcing bar. However, due to financial considerations, CSA G has not been updated since and there appears to be no intention to do so. The two specifications also contain a minor difference regarding the renovation of areas left uncoated during the galvanizing process.
Again, these two specifications are similar, but have major differences; particularly with regard to the listed coating properties. This material provides general information only and is not intended as a substitute for competent professional examination and verification as to suitability and applicability.