Philophronema. Festschrift fur Martin Sicherl zum 75. by Dieter Harlfinger

By Dieter Harlfinger

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Secondary Steelmaking: Principles and Applications

The steelmaking and its consumers have benefited greatly from the various major technological advances of the final thirty years. As their clients develop into ever extra caliber wakeful, notwithstanding, steelmakers needs to proceed their efforts to reduce destructive impurities, reduce in addition to alter destructive nonmetallic inclusions and attain the optimal casting temperature, content material of alloying parts, and homogeneity.

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Rcsults show that the torsional braid analysis in a In this experinient thc viscoelastic proper- useful method for determining viscoelastic ties of the samples emnined were measured as behaviour of lubrication oils and greases in the a funcuon of temperature and die rclations be- low temperature range and the effect of pour- tween their rcsults and a iueloiig point or pour- point depressant. point of lubricating oils were drscussed. Conse- A disuibuuoii of logarithrmc decrement quently it became clear as follows.

For high viscosity sample the results are shown in Fig. - 5 a. 4. c u The graph IS showiig two peaks on the curve of logarithmic decrement: one is at a temperature of about -56°C and the other about -150OC IS al p1: 0 -200 -150 -100 -50 Temperature 0 , *C 50 Fig. 4 Relative rigidity and logarithmk decrement of silicone oil of I St 36 Thiiigs to be CiiiplmSiZed Oblaiiicd rroiii thc ehpcriiiiciits oi sili- cone oils arc to esist two @s correspondlug to a iiielling point and grass traiisitioii teinpenture.

Greases, factors in the field of study or actual lubricating however, will display complex rhcological beliav- administration. There are standard mcthods for iors, because, for example, the phase transitions measuring viscosity and pour-point') in relation of greases have not yet to be clear. There are with these matters. With their standard mcthods torque performance tests for ball bearings thc flow properties of oils will give dificulty of lubricated by greascs2) in the low tcmpcrature the measurement in the low temperature range be- range.

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