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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 The CSA G classifications are more general and include; cast, rolled, stretched, pressed and forged steel; screws, bolts, nuts, rivets, nails and similar fasteners.
The information provided herein is not intended as a representation or warranty on the part of the AGA. G16 tables are shown below to compare the minimum coating thicknesses specified by each.
Both specifications require the use of a knife test to determine proper coating adherence. Again, these two specifications are similar, but have some very important differences; especially in regards to the specified g614 properties. Few conditions are given by G regarding the appearance of the zinc coating. This creates less confusion during the galvanizing process and a more b164 specification. 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.
The sampling procedure set up in G to test the coating thickness has very general guidelines. On the other hand, the A only requires that the average measurement of the thickness of the coating meet the minimum coating thickness required by Table 1, with the sample average having a coating less than that required in Table 1. New information and research are constantly taken into account when updates are made to ASTM A; the last update was in It has lost relevancy in the market and is seldom used.
Is CSA G still a valid specification? The 1g64 purity required by G is the difference between the two specifications. January 29, Authored by Daniel Barlow. The two specifications also contain a minor difference regarding the renovation of areas left uncoated during the galvanizing process. For example, each specification uses a table to describe the standards for minimum coating thickness of galvanized steel, but the minimum requirements and the materials listed are very different.
ASTM A also holds a few more requirements regarding the finish of the coating. It is important to be aware of these differences in the case where a manufacturer or prescriber requests information on CSA G However, due to financial considerations, CSA G has not been updated since and there appears to be no intention to do so. The material provided herein has been developed to provide accurate and authoritative information about after-fabrication hot-dip galvanized steel.
CAN/CSA-GM92 (R) | Standards Council of Canada – Conseil canadien des normes
New information and research are constantly being considered fsa updates are made to ASTM A; the last such update occurring in Total average equal to the requirement for the minimum coating thickness with the thicknesses of all samples greater than a coating grade less than in Table 1.
ASTM A is listed as the standard for repair for each specification. Despite this, G lumps this material in with all other materials and requires unattainable thicknesses for strip, bar, pipe, and tubing.
However, the information presented here may adequately describe some of the major differences between the two. Recent information has shown coatings much thicker than these minimum requirements are not attainable on these materials. This standard has lost its relevance in the market and is rarely used.
Standards Council of Canada
Both standards also cite that ASTM B6 is a standard that specifies that the zinc used in the galvanizing bath must be compliant. However, there are some competing specifications that get attention when an end user asks a galvanizer to use them. Each specification makes the coating thickness, finish, appearance and adherence of a hot-dip galvanized coating uniform. The procedure includes the option to choose the number of samples depending on the number of parts in the lot and the length and size of the parts.
Both standards also cite ASTM B6 as a standard to which the zinc used in the galvanizing bath must conform. The higher purity required by G creates the difference in the two specifications. However, there are some competing specifications that are worthy of consideration when g14 end user requests that the galvanizer use them.