This standard is issued under the fixed designation A /A M; the number 1 This specification is under the jurisdiction of ASTM Committee A05 on. A / AM Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Standard + Redline PDF Bundle, 18, $, ADD TO CART. Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel. coating (galvanizing) by the hot-dip process on iron and steel shall be done using the metric equivalent of the test or. centrifuged or otherwise handled to remove excess zinc (such ment of Hot-Dip Galvanized Structural Steel.
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PDF Drive is your search engine for PDF files. As of today we have 78,, eBooks for you to download for free. No annoying ads, no download limits, enjoy . A/AMSpecification for Zinc (Hot-Dip Galvanized) Coatings on Iron and work are summarized in Table 1 and Table 1A for ASTM A/AM, Table. ASTM AAM Standard Specification for Zinc_能源/化工_工程科技_专业 资料。Standard Specification for Zinc (Hot-Dip Galvanized).
These zinc skimmings are not cause for rejection as the coating beneath these skimmings is intact and will provide the antici- pated corrosion protection. Some zinc skimmings can be brushed off the surface or will be washed off in the rain or condensation that gathers on the part as it weathers in the atmosphere. Other zinc skimmings may need to be ground off the surface of the coating by the galvanizer without removing zinc to the point that the coating no longer meets the minimum thickness requirement.
Surface roughness of articles to be painted or powder coated and the smoothing of the galvanized coating before painting or powder coating shall be mutually determined by the galvanizer and the downloadr.
Further preparation of galvanized coatings for painting or powder coating including cleaning, profiling, and outgassing shall be in accordance with Practice D for painting and Practice D for powder coating and are the responsibility of the paint or powder coating applicator. Surface conditions related FIG. The length and width downloadr. Internal threads are not prohibited from being of the uncoated area shall be allowed to exceed 1 in.
Coatings shall conform to in only one of the two dimensions. The total of the uncoated areas interfere with the intended use of the material will not be subject to renovation by one of the methods of A shall also permitted. Surface roughness of articles to be painted or not exceed 36 in. The size of the uncoated area subject to renova- before painting or powder coating shall be mutually deter- tion shall only be applicable at the galvanizing facility.
Once mined by the galvanizer and the downloadr. Further preparation the parts have left the galvanizing facility there shall be no of galvanized coatings for painting or powder coating includ- limit on the size of the area subject to renovation.
Such inaccessible areas, for example, would powder coating applicator. Marks in the zinc coating caused by tongs or other areas for repairs using zinc metallizing or zinc solder shall be items used in handling the article during the galvanizing the class required by the thickness grade for the appropriate operation shall not be cause for rejection unless such marks steel material category in Table 1 in accordance with the have exposed the base metal and the bare metal areas exceed requirements of 6.
The minimum thickness of the renovation allowable maximums from 6.
The pieces shall be in the uncoated areas using paints containing zinc dust shall be handled so that after galvanizing they will not freeze together 3. When uncoated areas requir- consistent with the nature and thickness of the coating and the ing renovation are inaccessible for repair, the part shall be normal use of the article, without peeling or flaking. NOTE 9—Although some material may be formed after galvanizing, in general the zinc coating on the articles covered by this specification is too NOTE 6—The requirements for the finish of a galvanized product heavy to permit severe bending without damaging the coating.
They do not address the matter of measured coating thickness variations that can be encountered 7. Sampling because of different steels or different thicknesses of a given steel being used in an assembly.
Unless otherwise agreed upon grades comprising each test article is the average coating between the galvanizer and the downloadr, or established within thickness for that test article.
For test by the downloadr after delivery, the lot consists of sample. In this case, the minimum number of test articles from 8. The weight of coating per unit area 1 to 3 8 thus determined is converted to equivalent coating thickness 3 to 10 13 10 and over 20 values in accordance with Table 2 rounding up or down as appropriate. Such a plan is contained in Test article coating thickness, or in the case of a specimen removed Method B which addresses sampling procedures for the inspection of from a test article, is the specimen average coating thickness.
If Test Method 8. Test Methods methods described in 8. The first 8. The weight of accordance with this specification. The specifying of tests for coating per unit area thus determined is converted to equivalent adhesion and embrittlement shall be subject to mutual agree- coating thickness values according to Table 2 rounding up or ment between the galvanizer and downloadr.
Visual inspection down as appropriate. The thickness of coating thus obtained is of the coating shall be made for compliance with the require- the test article coating thickness. Current edition approved October 10, Published December Originally published as A — 28 T. Last previous edition A — 01a.
Terminology See Fig. Terminology A contains other terms and de? For purposes of this speci? These inclusions are raised surfaces and are easily knocked off FIG. For thickness testing purposes, articles whose surface area is greater than in. In the case of any such local section containing more than one material category or steel thickness range as delineated in Table 1, that section will contain more than one specimen see Fig.
If a sample is taken as representing the lot for acceptance, the sample shall be taken at random from the lot without regard to the perceived quality or appearance of any individual unit in the lot being sampled. The sample consists of one or more test articles. For thickness testing purposes, the entire surface area of each unit of product constitutes a specimen. In the case of any such article containing more than one material category or steel thickness range as delineated in Table 1, that article will contain more than one specimen see Fig.
For magnetic thickness measurements, specimen excludes any area of the surface which is subject to processes such as? 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. For a unit of product whose surface area is equal to or less than in.
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. Ordering Information 4. Materials and Manufacture 5. 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?
The galvanizer has only limited control over this condition. The mass, shape, and amount of cold working of the product being galvanized may also affect this condition. Practice A provides guidance on steel selection and discusses the effects of various elements in steel compositions for example, silicon , that in?
Practices A , A , and A provide guidance for steel fabrication for optimum hot dip galvanizing and shall be complied with in both design and fabrication. Consultation between the designer, fabricator, and galvanizer at appropriate stages in the design and fabrication process will reduce future problems. It is the responsibility of the downloadr to heat treat or otherwise allow for the possibility of such embrittling phenomena.
The requirements for malleable iron castings to be galvanized shall be as stated in Speci? If a zinc alloy is used as the primary feed to the galvanizing bath, then the base material used to make that alloy shall conform to Speci?
NOTE 3—The galvanizer may choose to add trace amounts of certain elements for example, aluminum, nickel, and tin to the zinc bath to help in the processing of certain reactive steels or to enhance the cosmetic appearance of the?
The use of these trace elements is permitted provided that the bulk chemistry of the galvanizing bath is at least The elements can be added to the galvanizing bath as part of a pre-alloyed zinc feed, or they can be added to the bath by the galvanizer using a master feed alloy.
NOTE 1—Each specimen comprises nominally one third of the total surface area of the article. A minimum of? Coating Properties 6. Minimum average thickness of coating for any individual specimen is one coating grade less than that required in Table 1.
Where products consisting of various material thicknesses or categories are galvanized, the coating thickness grades for each thickness range and material category of material shall be as shown in Table 1.
In the case of orders in SI units, the values in Table 1, shall be applicable as metric units in micrometres.
In the case of orders in inch-pound units, the measured value shall be converted to coating grade units by the use of Table 2. The speci? Do not use testing carried out at edges or corners points of lowest coating adhesion to determine In such case.
The average of no less than five such This shall be achieved by an in-plant inspection program measurements is the specimen coating thickness. The test method for the new sample shall conforming articles. The inspector representing the downloadr shall have 8. If the lot size is such that the sample size being performed.
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