Designation: D – 11Standard Test Methods for Field Measurement of Surface These test methods are under the jurisdiction of ASTM Committee D01 on. There are two ASTM standards that deal with surface profile assessment, D , Standard Test. Methods for Field Measurement of Surface Profile of Blast. 18 Oct For hot-dip galvanizing applications, it is possible to measure and verify the steel surface profile according to ASTM D, Standard Test.
|Published (Last):||18 June 2008|
|PDF File Size:||2.58 Mb|
|ePub File Size:||1.29 Mb|
|Price:||Free* [*Free Regsitration Required]|
The measurements must conform astm d 4417 the minimum and maximum surface profile requirements listed astm d 4417 the aztm specification.
While both the depth micrometer and replica tape methods conform to ASTM D, the measurement acquisition principles are quite different. This method can be used to measure the surface profile depth that is created by abrasive blast cleaning or impact-type power satm.
Work Item s – proposed revisions of this standard. This includes personalizing content and advertising.
Updates to ASTM D | American Galvanizer’s Association
According to ASTM D, a minimum of 10 readings is obtained per area; the maximum surface profile is reported discarding obvious outliers.
Standards for Measurement of Surface Profile. So, in effect astm d 4417 reading on the micrometer or the Astm d 4417 from the replica astm d 4417 represents several peaks and valleys, while the depth micrometer does not.
Only the use of surface profile depth micrometers and replica tape were updated, and the specification changes are as follows: Peak density 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 instruments described are asrm portable astm d 4417 sufficiently sturdy for use in the field.
Models from a astm d 4417 gage manufacturers are available that conform to this standard. These changes reflect industry research on current tooling which revealed averaged measurements are consistently less than the values obtained using replica tape.
The base of the instrument rests on the peaks of 44177 surface profile while the cone-shaped point projects into the valley. Astm d 4417 is Surface Profile and Why is it Necessary? Leave a 44417 Cancel reply Your email address will not be published. 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.
There astm d 4417 additional techniques suitable for laboratory use not covered by these test methods.
ASTM D4417 – 14
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 astm d 4417 where the surface has been prepared via power tool astm d 4417 abrasive blast cleaning methods.
Therefore, differences are inevitable, particularly with deeper surface profiles, and the results may or may not fall within the asmt range for one of the two methods. Save my name, email, and website in this browser for the next time I comment.
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. Historical Version s – view previous versions astm d 4417 standard Work Item s – proposed revisions of this standard Translated Version s: This can be discussed and agreed upon at the pre-construction conference. Surface Profile Depth Micrometer – It 44417 now required that the astm d 4417 individual reading of 10 or more surface profile readings per area are to be reported, rather than taking the average of ten readings per astm d 4417.
Same Surface, Different Results? 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.
Differences in Surface Profile Measurements: ASTM D4417- Method B vs. Method C
Leave this field empty. The astm d 4417 standards are: There are currently four primary standards for measurement of surface profile in steel surfaces. Note 1 — Optical microscope methods serve as a referee method for surface profile measurement methods A and B. 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 three test methods described within D for measuring surface profile include visual comparators, surface profile depth micrometers, and astm d 4417 tape. The depth is displayed on the gage in mils 0.
Profile depth designations are based on the concept of astm d 4417 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 astk measuring microscope. ICS Number Code Replica Astm d 4417 – 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.
The values given in parentheses are for information only.
The standard does not address discarding outliers, but an update to the standard addressing outlier readings is planned. According to ASTM D, a minimum of 2 readings is obtained per area; the average of the two readings is reported.