DIN Metallographic examination; microscopic examination of special steels using standard diagrams to assess the content of non-metallic inclusions. Buy DIN () Metallographic examination; microscopic examination of special steels using standard diagrams to assess the content of non-metallic. DIN Standard. The Non-Metallic Inclusion rating method as per DIN standards. K4 method is unique to the German standrd.
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When using diagrant plates Nos. Converted to a polished section area ol mm2 and rounde to the nearest whole nulnbers.
Welded steel pipes for pressure purposes acc. To DIN EN 10217 16 –17 Line pipes acc. To DIN EN ISO 3183 / DIN EN 10208 18 – 19 Precision steel pipes DIN EN 10305 / Steel pipes with threaded ends DIN EN 10255 20– 21 Steel pipes seamless acc. To DIN EN 10216-1 to -4 – dimensions and masses 22 – 23. Standards were used: ISO 4967, ASTM E45, EN 10247, DIN 50602 and JIS G0555 4. Figure 5: NMI with an approx. Diameter of 9 µm found by LOM iCT Conference 2014 – www.3dct.at 163.
Over 60 nrm Wldth? The reproduction is intendecl tct show that loosely grorJped stt’ings are to bo assignecl lower rating numbors corresponding to the arer of oxides contained.
Din 50602 Pdf Online
The width of the inclusion is to be assessed in accordance with diagram plate No. It can therefore only give att approxirnatc indicatiott of tho oliginal plate. Since such inclusions usr. Rating number 9 is resen’ed for macroscopic inclusions, which are not shown in diagrammatic form, becauss they would extend bsyond the limits of the image field.
The values obtained in the two cases should if possible be integers and for this reason rhould be rounded, if necessarY. Thls lowest rating number depends mainly on tho manufacturing process particularly the steelmaking processand on the intended application of the materisl concerned and the dimensions of the product. This is represented by columns 0, 2 and 5, each on the left of a basic column, Similar considerations apply for the evaluation of thicker inclusions with twice the area.
This figure can be used especially foisimple regding of interpolated values of inclusion longth and width. It is not permittod to give fractions to indicate the inclusion rating e. These numbers are then genorally in ranges which, for examplo in the case of mothod Krl’, srrt not recorded, but still ari’e to bo teken lntcl accoltnt for column of diagram plate No.
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Inclusions of equal area but differing in length x width or frequency, aro shown on the salne line next to the basic column for each type of inclusion. The length, and in column 6 also the width, are marked on the dlagrams in plate No. These values serves as indlces for the “degree of purity” of the guantity of matorial submittod for testing under the conditions existing. Th and therefore is to be measu V 7. The factors obtained on the basis of the Zn-a goometlic series for tho other rating numbers are to be rounded so that, in the calculatlon, it is only necessaryr to double or halve the numbers.
The specimen can be observed either through ths eyepiece or on a proiection on a ground glass screen.
These numerical relationships are shown in a graph in figure 2. Cnnvortod to a polished section area of lnrrn2, Rounded fronr 1 ,Gg to 1,7. The associatod numbers show the amount bv which the rating number is to be increased, with increasing frequency.
The principle of assignlng the rating number according to ths araa of the inclucions also applies for thlcker inclusions, the claseification of which by length has been mads in ascordanco with the basic series of For a classification of globular inclusions, insofar they are not represented in diagram plate No.
On the basis of experience the rules given in table 5 for guidance have been drawn up, which should as far as possible be used as a basis when agreeing on the method of evaluation. Non-metallic inclusions observed in such cases are to be rated on the basis of the inclusion length given below each diagram, Unless otherwise agreed, even larger inclusions of the same or of greater thickness tharn those shown are all to be classifiod under rating number 9.
The speclmens shall be taken in accordance with the specifications given in subclauses 5’2 and 5.
DIN 50602 ENGL
K Range of rnting numberrt to djn rrssd ln the evaluation Fr. I whorr comparing them to the basic series shown irr ptate No. An index proportional to the content of inclursions from a specified limit slze upwards can be calculated separately for the oxide and sulfide ,components or ,as a total value.
For calculation of the total indices the procoduro is as follows see also examples glven in tables? This magnification field under observation shall be of the same size as tho referencs diagrams of plate No. Microscopic examination can be carried out using a metallurgical microscope and auto. With this procedure, the larger inclusions are more accurately ovaluated, Table 6 gives the factors to be userJ in the calculations.
Din 50602 Pdf
Diagram plates Nor;,2 and 3, which supplement diagranl plate No. For obssrvation of very thin inclusions, it is advisable to use a magniflcation of x The two total indices or the ovirall total index reprss nt the degree of purity of the test unit examined.
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56002
Both mncroscopic and microscopic methods are used for this purpose. When using diagram plates Nos. The relevant numbers indicate the amount 5602 which the rating number assigned to the total length, is to be reduced because of the greater degree of fragmentation see subclause 7. This figura can be used especially for simplo reading of interpolated values of inclusion length and Diagram plate No.
Din 50602 Pdf
I if possible, 80mm in diameter; fields with a diameter between 75 and 80 mm are however permitted. Where only separate, predetermined measurement fields or parts of measurement field within the polished section are to be cxamined which is only advisable in exceBtlonal casesthe size and distributlon of these fiefds or parts of measurement fields shall comply with the conditions for a statistical test, tlre derived columns of diagram plate No.
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There is also provision for determining maximunr sizes. The dellvery conditions rnay specify a ditferent number of specinnens.