Liquid steel analysis
The application of a pulsed laser to the analysis of solid and liquid iron and steel was investigated, to develop in-situ methods of analysis of production materials. Optical emission spectrometric analysis can be carried out by direct observation of light emitted by the laser-induced plasma. Alternatively, each laser event causes the ablation of a small quantity of the sample during formation and expansion of the plasma. This evaporated material can be transported in a carrier gas (argon) and analysed by ICP emission spectrometry. Both of these techniques yield elemental analysis of solid and liquid steel surfaces, each aspect having characteristics which in different ways are advantageous to in-situ analysis. The speed, precision, sensitivity and accuracy of laser emission spectrometry and ICP analysis of ablated aerosols have been assessed in liquid and solid samples for a range of elements. The effectiveness and limitations of the two techniques are discussed in the context of potential practical applications. The most appropriate applications of laser-based analysis are dynamic situations during iron and steel production. Two such areas have been identified as the determinations of silicon in blast furnace iron, prior to torpedo ladle charging and of alloying element content during ladle additions of chromium and nickel.
Bibliographic Reference: EUR 11905 EN (1988) MF, 95 pp., ECU 4, blow-up copy ECU 12.5
Record Number: 198910293 / Last updated on: 1994-12-01
Original language: en
Available languages: en