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Bad Essen, Germany

Husken R.,Kuttner GmbH and Co. KG | Cappel J.,Cappel Stahl Consulting GmbH
MPT Metallurgical Plant and Technology International | Year: 2012

One of the most significant improvements in steel quality was the limitation of the sulphur content. That development was driven by the introduction of hot metal and steel desulphurization in integrated steelmaking plants. A side effect was the possibility of optimizing the slag composition in the blast furnace with respect to increased productivity and reduced costs. This article describes the state-of-the-art in desulphurization by explaining the sources of sulphur in iron and steelmaking, the quality requirements of steel products and the desulphurization technology. Source

Isdemir B.S.,Iskenderun Demir Ve Celik A.S. | Husken R.,Kudttner GmbH and Co. KG | Cappel J.,Cappel Stahl Consulting GmbH
AISTech - Iron and Steel Technology Conference Proceedings | Year: 2012

Iskenderun Demir Ve Celik A.S. in Turkey is operating an integrated steelplant located in Iskenderun in the south east of the country near the Syrian border. It is the largest plant in Turkey and has a total capacity of 5,4 mtpy and is supplying various steel grades in long and flat product shape to serve the local market and exports basically to countries around the Mediterranean Sea and overseas. The products of the company are billets, wire rod, rebar, slabs, hot rolled coils, plates and cold rolled coils. The markets vary from construction, agriculture, appliance, tank and boiler fabrication, ship building, line pipe, low alloy heat treatment steels and HSLA applications. The plant comprises two 6-strand billet casting machines (2,5 mtpy) and two 2-strand slab casting machines (5,2 mtpy). Over the last decade Isdemir has realized huge modernization and revamping projects in order to increase its annual steel output. The unique location of the company at the Mediterranean Sea, but without any own operated raw material sources creates a special metallurgical process route sensitive in terms of Sulfur and Phosphorous control. The demands of the process routes to control higher levels of Phosphorous in integrated steelmaking have been discussed in various presentations in the past. The emphasis of this paper is to explain the control of hot metal Sulfur coming with high levels of 1.500 ppm and more from the Blast Furnace during steelmaking by combined technology of Hot Metal and Steel Desulfurization. The benefit sharing between the BF and the BOF shops will be recognized and the requirements of high quality steel products on Sulfur control will be reviewed. Source

Urban W.,Huttenwerke Krupp Mannesmann GmbH | Weinberg M.,Huttenwerke Krupp Mannesmann GmbH | Cappel J.,Cappel Stahl Consulting GmbH
Stahl und Eisen | Year: 2014

The removal of phosphorus from the furnace charge is a well understood process today and is described by using the phosphorus partition ration between metal and slag Lp = (%P2O5)/[%P]. The L p depends on the melt temperature, the Fet content in the slag, slag basicity, slag volume, MgO content in the slag and the steel carbon content. Other parameters are the phoshorus input with the hot metal and the phosphorus content of the steel product specification. Furthermore the results also vary with the individual plant equipment available and the dephosphorization strategy applied. Source

Guoguang Z.,Shanghai Meishan Iron and Steel Ltd Company | Husken R.,Kuttner GmbH and Co. KG | Cappel J.,Cappel Stahl Consulting GmbH
Stahl und Eisen | Year: 2012

TBM bottom stirring is a technology introduced worldwide to enhance the metallurgical efficiency of the BOF process. By applying this technology inert gas injection through the bottom of the BOF vessel enhances the mixing effect of the top lance blowing jet. Slag Splashing was introduced in BOF operations to increase vessel campaign life, but generally it negatively impacts the efficiency of the bottom stirring. At Meishan Steel in China an operation practice was developed that successfully combines the advantages of both technologies. Source

Sener B.,Iskenderun Demir Ve Celik A.S. | Husken R.,Kuttner GmbH and Co. KG | Cappel J.,Cappel Stahl Consulting GmbH
Iron and Steel Technology | Year: 2013

Experts explain the control of hot metal sulfur coming in high levels from the blast furnace during steelmaking by the combined technology of hot metal and steel desulfurization. The benefit sharing between the BE and the BOF shops is recognized and the requirements of high-quality steel products on sulfur control are reviewed. Extensive examinations reveal that all steel types are on a different sulfur level and require special treatments according to their specifications. The total De-S required is split between the different product stages during liquid steel production. The main goal is to guarantee that the desulfurization reaction must be completely stopped after release of the liquid steel to the caster. Source

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