This thesis has been performed at Uddeholms AB with the purpose to investigate theparameters affecting the formation of Inclusions during the manufacturing of a low carbonmanganese-steel.A follow-up, steel and slag sampling and evaluations in microscope have been done for a totalof five heats.The results for each heat have been evaluated in relation to the theory from the literaturesurvey and suggestions for changes in the process to reduce the amount of Inclusions whichhave a negative effect on the steel quality have been given.The project extends over a large process where many parameters affect the formation ofInclusions. However, a tendency that a higher addition of alloys seems to increase the totalamount of Inclusions before and after the vacuum degassing is seen.The majority of the studied Inclusions seem to approach the composition of the top slag aftervacuum degassing. Ladle glaze may cause the Inclusions which had a different compositioncompared to that of the slag.A high or low ladleage together with a high argon flow during vacuum degassing seems todissolve particles from the refractory which later on get trapped inside the Inclusions.The floatation for two heats has been studied where a short floatation seems to give a higheramount of Inclusions in casted material.In machined material so called stringers were found. The main composition of those stringerswas pure alumina. Inclusions with a composition of pure alumina were not found in the liquidsteel, thus the pure alumina Inclusions must be formed during the casting.

In a multi-year project at Swerea Swecast AB studies on influence of dissolved gas on Inclusions have been made. The knowledge about these parameters could be used to increase the quality of the final steel casting. The purpose of this thesis was to closer examine the impact of the oxygen level on Inclusions.The questions asked were:? What was the amount of Inclusions at different levels of oxygen?? What was the size of these Inclusions at different levels of oxygen?? What does the Inclusions consist of at different levels of oxygen?This was studied by measuring and sampling, sample preparation and microscopic analysis using an optical microscope and a scanning electron microscope (SEM). Measurements and sampling was performed at Smålands Stålgjuteri AB in Eksjö and at Swerea Swecast AB in Jönköping.

Inclusion body disease (IBD) affecting boas and pythons is a serious and common disease. Boas can be clinically healthy carriers, which makes control of the disease difficult. The causative agent has not yet been confidently identified, and therefore there are no serodiagnostic tests available. Today, histopathologic examination of tissue biopsies is the recommended antemortem diagnostic method, but there are several disadvantages. The objective of this study was to compare the sensitivity of two diagnostic methods ? liver biopsies and blood smears, and to evaluate ultrasoundguided needle biopsy of the liver.