ASTM-A › Zinc Coating (Hot-Dip), Assembled Steel Products. ASTM-A – EDITION – SUPERSEDED — See the following: ASTM-. in Specifications A and A This ASTM Standards A47/ A47M 1 This specification is under the jurisdiction of ASTM Committee A05 on. ASTM AAM Standard Specification for Zinc – Standard A and A shall be done using the metric equivalent of the test.
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Gas Nitriding of Titanium Alloys: In the case of orders in SI units, all testing and inspection 1 This speci? The adhesion shall be considered inadequate if a86 coating?
ASTM Standard List: Coated Steels :: Total Materia Article
Except for local excess coating thickness which would interfere with the use of the product, or make it dangerous to handle edge tears or spikesrejection for nonuniform coating shall be made only for plainly visible excess coating not related to design factors such as holes, joints, or special drainage problems see Note 6.
In the case of an article containing more than one material category or steel thickness range as delineated in Table 1, that article will contain more than one specimen, as appropriate see Fig.
This article contains a list of standards that covers among other things: This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? For each specimen as described in 3. Do not use testing carried out at edges or corners points of lowest coating adhesion to determine adhesion of the coating. They do not address the matter of measured coating thickness variations that can be encountered because of different steels or different thicknesses of a given steel being used in an assembly.
The minimum average coating thickness grade for any specimen shall be one coating grade below that required for the appropriate material category and thickness in Table 1. NOTE 6—The requirements for the? ASTM specifications represent a consensus among producers, specifiers, fabricators, and users of steel mill products. Some higher-than-standard thicknesses may be impractical or unattainable. The test method for the new sample shall be selected by mutual agreement between the purchaser and galvanizer.
This shall be achieved by an in-plant inspection program designed to maintain the coating thickness,? The weight of coating per unit area thus determined is converted to equivalent coating thickness values in accordance with Table 2 rounding up or down as appropriate.
These designations often apply to specific products, for example A is applicable to cold-heading quality carbon steel wire for tapping or sheet metal screws. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. The specifying of tests for adhesion and embrittlement shall be subject to mutual agreement between the galvanizer and purchaser. NOTE 7—Items which are prepared for galvanizing by abrasive cleaning will generally develop a thicker coating with a moderately rougher surface.
The pieces shall be handled so that after galvanizing they will not freeze together on cooling. Click here to see more.
Last previous edition A — 01a. Visual inspection of the coating shall be made for compliance with the requirements. If the lot is found to be nonconforming by the new sample, the galvanizer has the right to sort the lot for conforming articles by individual test, to re-galvanize non-conforming articles, or to renovate the nonconforming articles in accordance with 6.
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ASTM A – Withdrawn Specification for Zinc Coating (Hot-Dip) on Assembled Steel Products
Finding ASTM materials and standards from specific designation systems in the Total Materia database With Total Materia finding information about a metal standard specification, its current status and the materials it defines is one click away. Unless otherwise agreed upon between the galvanizer and the purchaser, or established within this speci?
Number of Pieces in Lot 3 or less 4 to to 1 1 to 3 3 to 10 10 and over Number of Specimens all 3 5 8 13 20 NOTE 10—Where a number of identical items are to be galvanized, a statistical sampling plan may be desired. While most coating thicknesses will be in excess of those values, some materials in each category may be less reactive for example, because of chemistry or surface condition than other materials of the steel category spectrum.
If the lot size is such that the sample size cannot be doubled, then the sample size shall be as previous, but the number of widely dispersed sites at which measurements were made shall be doubled, and these sites will constitute the new sample. Surface conditions related to de?
Such inaccessible areas, for example, would be the internal surfaces of certain tanks, poles, pipes, tubes, and so forth.
NOTE 4—The coating thickness grades in Table 1 represent the minimum value obtainable with a high level of con? The weight of coating per unit area thus determined is converted to equivalent coating thickness values according to Table 2 rounding up or down as appropriate.
Each system shall be used independently of the other without combining values in any way. NOTE 2—The presence in steels and weld metal, in certain percentages, of some elements such as silicon, carbon, and phosphorus tends to accelerate the growth of the zinc-iron alloy layer so that the coating may have a matte? Since surface smoothness is a relative term, minor roughness that does not interfere with the intended use of the product, or roughness that is related to the as-received un-galvanized surface condition, steel chemistry, or steel reactivity to zinc 5 6.
Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. The thickness thus determined is a point value. A specimen must be evaluated for each steel category and material thickness within the requirements for each specimen of the test article. Introduction to Total Materia 7 th February Total Materia has allowed us to solve in a definite way all problems we had for the search of alternate materials in foreign countries.
This new sample shall be measured using magnetic thickness gages which have been calibrated for accuracy against reference material thickness standards.
Lumps, projections, globules, or heavy deposits of zinc which will interfere with the intended use of the material will not be permitted. Your comments are s386 either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
Terminology A contains other terms and de?
ASTM Standard List: Coated Steels
Internal threads are not prohibited from being tapped or retapped after galvanizing. NOTE 9—Although some material may be formed after galvanizing, in general the zinc coating on the articles covered by this speci?
Practices AAand A provide guidance for steel fabrication for optimum hot dip galvanizing and shall be complied with in both design and fabrication. In the case of orders in SI units, the values in Table 1, shall be applicable as metric units in micrometres. Inchpound units and SI units are not necessarily exact equivalents. Enter a phrase to search for: