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.
|Published (Last):||14 January 2011|
|PDF File Size:||20.31 Mb|
|ePub File Size:||14.87 Mb|
|Price:||Free* [*Free Regsitration Required]|
Over 60 nrm Wldth? This standard specifies a method to be applied using a metallurgical microscope and a set of standard diagrams arranged in a systematic sequence, which enables the micrograph to be described on the basis of the type and size of inclusion length and width or diameter and the frequency standard diagram plate When using diagram plates Nos. 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.
For calculation of the total indices the procoduro is as follows see also examples glven in tables? With this nethcrd, the alea of the polished section of the specimc,n to be evaluatod strall be at least nrmz.
DIN 50602 ENGL
There is also provision for determining maximunr sizes. Diagram plates Nor;,2 and 3, which supplement diagranl plate No. These numerical relationships are shown in a graph in figure 2. For tlre evaluation proper, the full scale diagram plate should be used; ‘il1is can be obtainod fronr Eouth Verlag Gmbll ‘ BurygrafonstraBet1″ Berlin 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.
I whorr comparing them to the basic dln shown irr ptate No. This figura can be used 506022 for simplo reading of interpolated values of inclusion length and Diagram plate No. The length, and in column 6 also the width, are marked on the dlagrams in plate No. Relationship between true width, true length and sizc rating number for the inclusions referrod to in tables 2 and 3 congidered necessrtry to reprosent individual sulfidic inclusions.
With this procedure, the larger inclusions are more accurately ovaluated, Table 6 gives the factors to be userJ in the calculations.
The length of an oxidic inclusion in the case of OA inclusions is greater than that for OS inclusions of the same width, because for a given rating number, the aroa vrrould otherwise be dlfferent. The associatod numbers show the amount bv which the rating number is to be increased, with increasing frequency.
Which of the two methods is to be used, shall be specified in the rplevant deliverv condition. The factors obtained on the basis of the Zn-a goometlic diin for 50620 other rating numbers are to be rounded so that, in the calculatlon, it is only necessaryr to double or halve the numbers.
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. Inclusions 5062 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. It is not permittod to give fractions to indicate the inclusion rating e.
The specimen can be observed either through ths eyepiece or on a proiection on a ground glass screen. For obssrvation of very thin inclusions, it is advisable to use a magniflcation of x Cnnvortod to a polished section area of lnrrn2, Rounded fronr 1 ,Gg to 1,7.
The width of the inclusion is to be assessed in accordance with diagram plate No. This magnification field under observation shall be of the same size as tho referencs diagrams of plate No. Converted to a polished xin area ol mm2 and rounde to the nearest whole nulnbers.
Such a magnification is equal to the scale on which diagram plate Nos,? The two total indices or the ovirall total index reprss nt the degree of purity of the test unit examined.
Both mncroscopic and microscopic methods are used for this purpose. Microscopic examination can be carried out using a metallurgical dun and auto. 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.
The values obtained in the two cases should if possible be integers and for this reason rhould be rounded, if necessarY. The associated numbers show the amount by which the rating numbor is to be increased, with increasing frequency.
DIN ENGL – Free Download PDF
The dellvery conditions rnay specify a ditferent number of specinnens. 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.
This result is then to be converted to a section area of mm2, using the following formula: When using diagrant plates Nos. The right-hand column of diagram trlate No.
In such cases, the rating number is to be increased bv 1. 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.
The speclmens shall be taken in accordance with the specifications given in subclauses 5’2 and 5. It can therefore only give att approxirnatc indicatiott of tho oliginal plate. 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.
These values serves as indlces for the “degree of purity” of the guantity of matorial submittod for testing under the conditions existing. This figure can be used especially foisimple regding of interpolated values of inclusion longth and width.