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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Today, Method B and Method C are the most commonly used, so that is what we will be focusing on. Instead, recording of the highest reading when using a depth micrometer most closely matches the same measurements produced using replica tape.
This method can be used to measure the surface profile depth that is created by abrasive blast cleaning or impact-type power tools. Visual Comparator – This test method, as well as the comparator discs available on the market, have stayed the same, and therefore there were no updates for this test method. The information provided herein is not intended as a representation d4417 warranty on the part of the AGA. Precision and Bias 8. Hold the gage by its base and press?
Historical Version s – view previous versions of standard. Link to Active This link will always route to the current Active version x4417 the standard. Your comments will receive careful consideration at a meeting of the responsible technical committee,1which you may attend. October 18, Authored by Alana Hochstein. The mode is determined with the comparator of Test Method A.
Updates to ASTM D4417
A number in parentheses indicates the year of last reapproval. The distance from the bottoms of many of the deepest valleys to the tops of the highest peaks maximum pro? As a result, only two readings per area are now required to be averaged to obtain one measurement, instead of the three readings previously required. For hot-dip galvanizing applications, it is possible to measure and verify the steel surface profile according to ASTM Atm, 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.
Last previous edition approved in as D — 93 NOTE 1—Optical microscope methods serve as a referee method for surface pro? These changes reflect industry research on current tooling which revealed averaged measurements are consistently less than the values obtained using replica tape.
A superscript epsilon e indicates an editorial change since the last revision or reapproval. ASTM D contains three methods of d417 surface profile depth: Summary of Test Method 2.
Note 1 — Optical microscope methods serve as a referee method for surface profile measurement methods A and B. Leave a Reply Cancel reply Your email address will not be published. Profile depth designations are based on the concept of mean maximum profile h max ; this value is determined by averaging a given number usually 20 of the highest peak to lowest valley measurements made in the field of view of a standard measuring microscope.
How is Surface Profile Depth Quantified? The values given in parentheses are for information only.
Your email address will not be published. The creation of this peak-valley pattern in the surface effectively increases the surface area, providing an anchor for the coating system.
Replica Tape – Although the technology has remained mostly constant for replica tape since its introduction, industry research has addressed the sufficient number of readings required to achieve an accurate measurement. What is Surface Profile and Why is it Necessary? Historical Version s – view previous versions of standard Work Item s – proposed revisions of this standard Translated Version s: 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 asym.
Differences in Surface Profile Measurements: ASTM D4417- Method B vs. Method C
Once the burnishing process is complete, the replica tape is removed from the surface and the image is measured using a spring-loaded micrometer.
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. It is the responsibility of whoever uses this standard to consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
A burnishing tool is used to impress the foam face of the tape into the surface to create a reverse replica of the pro?
Updates to ASTM D | American Galvanizer’s Association
ICS Number Code Anyone making use of this information assumes all liability arising from such use. Subtract the thickness of the noncompressible plastic?
Users of this standard are expressly advised that determination of the validity of any such patent r4417, and the risk of infringement of such rights, are entirely their own responsibility. Standards for Measurement of Surface Profile. Only the use of surface profile depth micrometers and replica tape were updated, and the specification changes are as follows: Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
This is done because of evidence that coatings performance in any one small area is primarily in? 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.
Do not drag the instrument across the surface between readings, or the spring-loaded tip may become rounded leading to false readings. Same Surface, Different Results? According to ASTM D, a minimum of 10 readings is obtained per area; the maximum surface profile is reported discarding obvious outliers.