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Update: Steel samples

17.11.2020

17.11.2020  14:00 CEST

Duration:      45 min. talk + 15 min. QA

Presenter:      Mr. H.-G. Schmitz

Latest developments in sample preparation of steel samples

This seminar deepens the latest developments in sample preparation of steel samples. Herzog developed an algorithm for flexible, intelligent distribution of spark points on defective steel or iron samples. A new module for generating granular chips for combustion analysis, which was developed for the HS-F1000, will also be presented. In addition, a study on the depth of removal when milling or grinding steel samples is presented.

 

Intelligent allocation of analysis points on steel samples
Correct OE-Analysis of steel samples is only possible on perfectly prepared samples. Inclusions in the sample falsify any result. Inclusions and defects that arise during sampling cannot always be repaired by preparation, e.g. by milling depth, but they can easily be detected with camera systems. It is important to avoid these areas of the sample surface when selecting the analysis points. The optimal areas for the spark points must have to be found and defined.
This definition is usually carried out by comparing firmly specified areas with the images from the camera system. With help of a new Herzog developed algorithm, these areas can now also be freely allocated on the sample. Other boundary conditions can also be taken into account, e.g. whether the analysis should be carried out in an area close to the filling pin or rather further away from it. Also distances to the edge of the sample and to each other can be defined.
This presentation gives a brief overview of the possibilities that Herzog camera technology offers for an intelligent placement of analysis points on samples showing  defects.

 

Influence of milling depth on optical emission spectroscopy of steel samples
In steelworks laboratories, when preparing steel samples, the value 0.8 mm is repeatedly given as the desired preparation depth. This value is given worldwide for the sample preparation of steel samples for optical emission analysis. Herzog examined this value in more detail in an extensive series of tests.
In this study, 300 steel samples were analyzed at four different depths at 6 specified points. The elements carbon and chromium were examined, their mean values ​​and standard deviations in the various samples and levels. The result was that a minimum removal depth of 0.7 mm is required to achieve the representative homogeneous layer. Furthermore, the tests have shown the high precision in the milling depth infeed of the HS-F1000 as well as investigated the effect of the choice of the spark point depending on the distance to the filling pin.

The results of this study are explained in more detail in the following presentation.

 

Automatic sample production for CNS-Chip Analysis
The production of chips in milling machines and their subsequent use in combustion analysis is now a widely used process in the laboratories of steel manufacturers. Herzog milling machines are equipped with appropriate facilities. The sampling, preparation and provision of the sample on the analysis device is decisive for the success of the sample analysis, even with chips. The Herzog module is able to generate small, free-flowing chips, which are also suitable for automating the combustion devices.
Herzog has carried out detailed investigations on the new module on the HS-F1000, which was specially developed for granular chip production. Analytical measurements that have kindly taken place at Eltra Headquarter, in which the chips produced in the HS-F1000 were compared with cut samples, have shown that the results for carbon, nitrogen and sulfur in the chip samples are suitable in terms of shape and quality for the analysis and also for the automation of the combustion devices.
The results of these studies are highlighted in this presentation.

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