Thyssenkrupp Steel Europe Ag

Thyssen Krupp Ag

Robert Yanik

Friedhelm Macherey

Klaus Uran

Jennifer Schulz

Karsten Machalitza

Folkert Schulze-Kraasch

Peter Heidbuechel

Thomas Huper

Frank Friedel

Lena Sattler

Frank Vennemann

Bastian Schöntaube

Marcel Siegel

Heinz-Gunter Schwanke

Heinz-Günter Schwanke

Michael Reckzeh

Thomas Hueper

The present invention relates to a method of hot dip coating of flat steel products, comprising a step of stripping the coated steel strip by means of at least one nozzle that emits a stripping gas having a temperature Tat an angle &#x3b1; in the direction of the coated steel strip, wherein the angle &#x3b1;, the distance h between the surface of the melt bath and the lower edge of the nozzle in mm, the temperature of the stripping gas in &#xb0; C. and the differential between the temperature Tof the melt bath and the temperature Tof the steel strip are in a particular relationship to one another, and to a correspondingly produced hot dip-coated flat steel product.

Hot dip coated steel strip having an improved surface appearance and method for production thereof

A flat steel product which, following a 5% biaxial deformation, exhibits, on one surface, a Wsa(1-5) value of &#x3c;0.35 &#x3bc;m, a planar anisotropy &#x394;r of &#x2212;0.5 to +0.5 and, from the surface to a depth of &#x3c;200 &#x3bc;m, and a nanohardness of &#x3e;0.1 to &#x3c;3.0 GPa. Also, a method of making the product where a slab including (in wt. %) 0.0003-0.050% C, 0.0001-0.20% Si, 0.01-1.5% Mn, 0.001-0.10% P, 0.0005-0.030% S, 0.001-0.12% AI, and 0.0001-0.01% N, the remainder Fe and impurities is heated to 1200-1270&#xb0; C., rough-rolled with a reduction of 80-90%, and finish-hot-rolled at 850-950&#xb0; C. with a reduction of 85-95%, for a total deformation of 95-99.5%. The reduction in the last hot roll pass is 1-25%, and the product is cooled at 4-30 K/s to a coiling temperature of 620-780&#xb0; C. Following pickling, the product is cold-rolled with a total degree of deformation of 70-90% and recrystallization annealed at 650-900&#xb0; C.

Method for manufacturing flat steel products and flat steel product

A method for determining the wear properties of coated flat products such as galvannealed flat steel products is provided herein. In order to be able to achieve better comparability of the determined wear properties of different flat products at least one bending parameter for the bending of the particular flat product by a bending device is selected in accordance with defined criteria on the basis of information regarding the thickness and/or the strength of the particular flat products to be bent. The flat products are bent in the bending device in accordance with the selected bending parameters, wear thus being produced. The wear properties are analyzed in a predetermined manner on the basis of the wear of the particular flat products.

Method and device for determining the wear properties of coated flat products by means of bending

A method for determining the abrasion properties of a coated flat product is described. A corresponding method is proposed in which an adhesive strip is stuck to the coating of the flat product, the flat product is bent in the region provided with the adhesive strip or to be provided with the adhesive strip, the adhesive strip after bending is peeled off together with abrasion material of the coating adhering to the adhesive strip, the grey tones of the adhesive strip are determined stripe by stripe crossways to the width of the abrasion, and on the basis of the grey tones determined stripe by stripe the grey width is determined as the width of the abrasion and/or the representative grey tone is determined as the representative grey tone of the grey tones determined stripe by stripe.

Method and device for determining the abrasion properties of a coated flat product

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Moers, Germany

Robert Yanik