For hot-dip galvanizing applications, it is possible to measure and verify the steel surface profile according to ASTM D, Standard Test. ASTM D – 11 Standard Test Methods for Field Measurement of Surface Profile of Blast – Download as PDF File .pdf), Text File .txt) or read. ASME B, Surface Texture (Surface Roughness, Waviness and Lay); ASTM D, Standard Test Methods for Measurement of Surface Profile of Blast.

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The height of a single peak above an adjacent valley below is measured with a microscope for the qualitative rating that is compared with each of the methods in correlation calculations. The depth is displayed on the gage in mils 0.

For more information related to surface preparation as it relates to hot-dip galvanized steel, you can contact AGA Corrosion Engineer Alana Hochstein at ahochstein galvanizeit. For hot-dip galvanizing applications, it is possible to measure and verify the steel surface profile according to ASTM D, Standard Test Methods for Field Measurement of Surface Profile of Blast Cleaned Steel, prior to application of repair materials where the surface has been prepared via power tool or abrasive blast cleaning methods.

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Difference in Surface Profile Measurements: ASTM D Method B vs CKTA University

Historical Version s – view previous versions of standard Work Item s – proposed revisions of this standard Translated Version s: Only the use of surface profile depth micrometers and replica tape were updated, and the specification changes are as follows:.

Your comments will receive careful e4417 at a meeting of the responsible technical committee, which you may attend. A number in parentheses indicates the year of last reapproval. Recent changes to ASTM D provide updated test methods to reflect the latest advances in technology and newly accepted industry research.

Do not drag the instrument across the surface between readings, or the spring-loaded tip may become rounded leading to false readings. Once the burnishing process is complete, the replica tape is removed from the surface and the image is measured using a spring-loaded micrometer. According to ASTM D, a minimum of 2 readings is obtained per area; the average of the two awtm is reported.

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Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. Same Surface, Different Results?

Updates to ASTM D4417

Larger repair areas or prepared hot-dip galvanized surfaces for painting can be measured with 10 readings taken from a minimum of three, 6×6 inch 15×15 cm areas.

The material asttm herein has been developed to provide accurate and authoritative information about after-fabrication hot-dip galvanized steel.

The three test methods described within D astn measuring surface profile include visual comparators, surface profile depth micrometers, and replica tape. According to ASTM D, a minimum of 10 readings is obtained per area; the maximum surface profile is reported discarding obvious outliers. Peak x4417 the number of peaks per unit area also plays a key role in maintaining adhesion of the coating system and provides greater resistance to corrosion undercutting when the coating system gets damaged while in service.

The surface profile must be compatible with the coating system. Authored by Alana Hochstein. What is Surface Profile and Why is it Necessary? The height of a single valley below a plane at the level of the highest surrounding peaks is measured with the?

October 18, Authored by Alana Hochstein. Leave this field empty. Typically, the higher the coating thickness the greater the surface profile depth. For measurements that fall between tape sizes, it is still required that two readings using each tape are to be averaged to comprise one reading i. The mode is determined with the comparator of Test Method A. There are additional techniques suitable for laboratory use not covered by these test methods.

Differences in Surface Profile Measurements: ASTM D4417- Method B vs. Method C

ASTM D contains three methods of measuring surface profile depth: Your email address will not be published. For this reason, surface pro? The four standards are: Anyone making use of this information assumes all liability arising from such use.

As a result, only two readings per area are now required to be averaged to obtain one asstm, instead of the three readings previously required.

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While both the depth micrometer and replica tape methods conform to ASTM D, the measurement acquisition principles are quite different. Because the results for the microscope and for the? This material provides general information only and is not intended as a substitute for competent professional examination and verification as to suitability and applicability.

We use cookies to understand how you use our site and to improve your experience. NOTE 2—The test methods measure different values and the qualitative rating on which the applicability was determined also measures a different value. How is Surface Profile Depth Quantified? When the abrasive impacts the surface, it cuts into the surface angular abrasives or peens the surface round abrasives and creates a series of peaks and valleys in the surface.

During abrasive blast cleaning, the mass of the abrasive and the velocity of the abrasive movement created by compressed air generates kinetic energy the abrasive can reach speeds of over miles per hour as it exits the blast nozzle. These changes reflect industry research on current tooling which revealed averaged measurements are consistently less than the values obtained using replica tape.

Leave a Reply Cancel reply Your email address will not be published. By continuing to use our site, you accept our use of cookies To learn more, click Read More to view our Privacy and Cookies Policy. Current edition approved May 10, The standard does not address discarding outliers, but an update to the standard addressing outlier readings is planned.

This is done because of evidence that coatings performance in any one small area is primarily influenced by the highest surface features in that area and not by the average roughness. There are additional techniques suitable for laboratory use not covered by these test methods. The measurements must conform to the minimum and maximum surface profile requirements listed in the project specification.

Originally approved in Today, Method B and Method C are the most commonly used, so that is what we will be focusing on.