ASTM A123/A123M-15 pdf free.Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products.
ASTM A123/A123M covers the requirements for zinc coating (galvanizing) by the hot-dip process on iron and steel products made from rolled pressed and forged shapes, castings, plates, bars, and strips.
4. Ordering Information
4.1 Orders for coatings provided under this specification shall include the following:
4.1.1 Quantity (number of pieces to be galvanized )and total weight.
4.1.2 Description(type and size of products )and weight
4.1.3 ASTM specification designation and year of issue.
4.1.4 Material identification (see 5.1)and surface condition or contamiation.
4.1.5 Sampling plan, if different from 7. 3.
4.1.6 Special test requirements (see 8.1)
4.1.7 Special requirements (special stacking, heavier coating weight, etc.
4.1.8 Tagging or piece identification method.
6. Coating Properties
6.1 Coating Thickness-The average thickness of coatin for all specimens tested shall conform to the requirements of Table I for the categories and thicknesses of the material being alvanized. Minimum average thickness of coating for any individual specimen is one coating grade less than that required in Table I. 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 I, 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.
8. Test Methods
8.1 Test Requirements – The following tests shall be con ducted to ensure that the zinc coating is being furnished in accordance with this specification. The specifying of tests for adhesion and embrittlement shall be subject to mutual agree ment between the galvanizer and purchaser. Visual inspection of the coating shall be made for compliance with the requirements
8.2 Thickness of Coating Test-The thickness of coating is determined by one or more of the three methods described as follows.
8.2.1 Magnetic Thickness Measurements-The thickness of the coating shall be determined by magnetic thickness gage measurements in accordance with Practice E376 unless the methods described in 8.2.2. 8.2.3. or 8.2.4 are used. For each specimen (as described in 3. 2. 9) five or more measurements shall be made at points widely dispersed throughout the volume occupied by the specimen so as to represent as much as practical, the entire surface area of the test specimen. The average of the five or more measurements thus made for each specimen is the specimen coating thickness.ASTM A123/A123M-15 pdf free download.