Thyssen Krupp Ag

Thyssenkrupp Steel Europe Ag

Lena Sattler

Friedhelm Macherey

Robert Yanik

Frank Friedel

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.

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Krefeld, Germany

Lena Sattler