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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Same Surface, Different Results? The values given in parentheses are for information only. Larger repair areas or atsm hot-dip galvanized surfaces for painting can be measured with two readings taken from a minimum of three, 6×6 inch 15×15 cm areas. The comparator areas are used with or without magni?
Updates to ASTM D | American Galvanizer’s Association
Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. A superscript epsilon e indicates an editorial change since the last revision or reapproval. Link to Active This link will always route to the current Active version of the standard. ICS Number Code 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.
Last previous edition approved in as D — 93 This material provides general information only and is not intended as a substitute for competent professional examination and verification as to suitability and applicability.
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. 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.
It is the responsibility asfm whoever uses this standard to consult x4417 establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Standards for Measurement of Surface Profile. ASTM D contains three methods of measuring surface profile depth: 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 d447 measurements made in the field of view of a standard measuring microscope.
This can be discussed and agreed upon at the pre-construction conference. The instruments described are readily portable and sufficiently sturdy for use in the field. 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.
Recent changes to ASTM D provide updated test methods to reflect the latest advances in technology and newly accepted industry research.
Updates to ASTM D4417
Anyone making use of this information assumes all liability arising from such use. Standards for Measurement of Surface Profile There are currently four primary standards for measurement of surface profile in steel surfaces. How is Surface Profile Depth Quantified?
The standard does not address discarding outliers, but an update to the standard addressing outlier readings is planned. 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. 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.
According to ASTM D, a minimum of 10 readings is obtained per area; the maximum surface profile is reported discarding obvious outliers. Typically, the higher the coating thickness the greater the surface profile depth.
While both the depth micrometer and replica tape methods conform to ASTM D, the measurement acquisition principles are quite different. NOTE 2—The test methods measure different values and the qualitative rating on which the applicability was determined also measures a different value.
Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
There are additional techniques suitable for laboratory use not covered by these test methods. Visual Sstm – 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. Only the use of surface profile depth micrometers and replica tape were updated, and the d44177 changes are as follows:.
It is the responsibility of whoever uses this standard to consult and establish appropriate safety and health practices and determine the asrm of regulatory limitations prior to use.
Leave this field empty. Hold the gage by its base and press?
Difference in Surface Profile Measurements: ASTM D Method B vs CKTA University
A burnishing tool is used to impress the foam face of the tape into the surface to create a reverse replica of the pro? 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.
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 same area i.
What is Surface Profile and Why is it Necessary? This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Typical comparator surfaces are prepared with steel shot, steel grit, or sand or other nonmetallic abrasive, since the appearance of the pro?
Summary of Test Method 2.
Surface Profile Depth Micrometer – It is now required that the maximum individual reading of 10 or more surface profile readings per area are to be reported, rather than taking the average of ten readings per area. These changes reflect industry research on current tooling which revealed averaged measurements are consistently less than the values obtained using replica tape. According to ASTM D, a minimum of 2 readings is obtained per area; the average of the two readings is reported.
Only the use of surface profile depth micrometers and replica tape were updated, and the specification changes are as follows: So, in effect the reading on the micrometer or the RTR from the replica tape represents several peaks and valleys, while the depth micrometer does not.