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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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. Larger repair areas or prepared hot-dip galvanized surfaces for painting can be measured with two readings taken from a minimum of three, 6×6 x4417 15×15 cm areas.
Standards for Measurement of Surface Profile There are currently four primary standards for measurement of surface profile in steel surfaces. 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.
Measure the thickness of the tape compressed foam and non-compressible plastic? Authored by Alana Hochstein.
Differences in Surface Profile Measurements: ASTM D4417- Method B vs. Method C
The distance from the bottoms of many of the deepest valleys to the tops of the highest peaks maximum pro? How is Surface Profile Depth Quantified? Instead, recording of the highest reading when using a depth micrometer most closely matches the same measurements produced using replica tape. Therefore, differences are inevitable, particularly with deeper surface profiles, and the results may or may not fall within the specified range for one of the two methods.
Your comments will receive careful consideration at a meeting of the responsible technical committee,1which you may attend. The material provided herein has been developed to provide accurate and authoritative information about after-fabrication hot-dip galvanized steel. Today, Method B and Method C are the most commonly used, so that is what we will be focusing on.
For this reason, surface profile should be measured prior to coating application to ensure that it meets that specified. Current edition approved May 10, NOTE 1—Optical microscope methods serve as a referee method for surface pro? This includes personalizing content and advertising. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
There are additional techniques suitable for laboratory use not covered by these test methods. Historical Version s – view previous versions of standard.
Note 1 — Optical microscope methods serve as a referee method for surface profile measurement methods A and B. The instruments described are readily portable and sufficiently sturdy for use in the adtm.
Updates to ASTM D | American Galvanizer’s Association
The mode is x4417 with the comparator of Test Method A. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
Only the use of surface profile depth micrometers and replica tape were updated, and the specification changes are as follows:. When a project specification simply invokes ASTM D and not a specific method, the results of the surface profile measurements may differ when two different methods are used on the same project, even on the same surface and within the ast area i.
Subtract the thickness of the noncompressible plastic? Aetm information provided herein is not intended as a representation or warranty on the part of the AGA.
Updates to ASTM D4417
The height of a single peak above an adjacent valley below is measured with a microscope for the qualitative rating asgm is compared with each of the methods in correlation calculations.
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. Typical comparator surfaces are prepared with steel shot, steel grit, or sand or other nonmetallic abrasive, since the appearance of the pro? Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
Do not drag the instrument across the surface between readings, or the spring-loaded tip may become rounded leading to false readings. ASTM D contains three methods of d417 surface profile depth: NOTE 2—The test methods measure different values and the qualitative rating on which the applicability was determined also measures a different value.
The instruments described are readily portable and sufficiently sturdy for use in the? These changes reflect industry research on current tooling which revealed 4d417 measurements are consistently less than the values obtained using replica tape. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
Peak density the number of peaks per unit area also plays a e4417 role in maintaining adhesion of the coating system and asttm greater resistance to corrosion undercutting when the coating system gets damaged while in service.
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.
The comparator areas are used with or without magni? Your comments will receive careful consideration at a meeting of the responsible technical committee,1which you may attend Copyright? As a result, only two readings per area are now required to d4471 averaged to obtain one measurement, instead of the three readings previously required.