Ebner Industrieofenbau Gmbh

C.d. Walzholz Gmbh

C.d. Waelzholz Gmbh

Michael Hellmann

Hans-Toni Junius

Peter Ebner

Heribert Lochner

Werner Kaiser

Dirk Wilmes

Heino Buddenberg

Heinz Höfinghoff

Heinz Hoefinghoff

The invention relates to a cold-rolled carbon steel comprising (in % by weight) C 0.63-0.85%, max. 0.40% Si, 0.20-0.90% Mn, max. 0.035% P, max. 0.035% S, max. 0.060% Al, max. 0.40% Cr, 0.003-0.010% N, preferably 0.005-0.008%, and a maximum of 0.12% of at least one micro-alloying element, the remainder being iron and steel production-related pollutants. Possible micro-alloying elements are Ti, Nb, V and optionally Zr. A carbon steel of the type is cold-rolled into texture-rolled strip steel with a high cold reduction degree and can be used in particular as a material for coiling springs or other components having spring properties.

Micro-alloyed carbon steel as a texture-rolled strip steel, in particular for spring elements

A method continuously creates a bainite structure in a carbon steel, especially a strip steel by austenitizing the carbon steel; introducing the austenitized carbon steel into a bath containing a quenching agent; adjusting the carbon steel to the transformation temperature for bainite and maintaining the transformation temperature for a certain period of time; and then cooling the carbon steel. The carbon steel stays in the bath until a defined percentage of the bainite structure relative to the total structure of the carbon steel has formed. Residues of the quenching agent are removed from the surface of the carbon steel by blowing the same off when the carbon steel is discharged from the bath, and the remaining structure components of the carbon steel are then transformed into bainite in an isothermal tempering station without deflecting the carbon steel at all.

Method and device for the continuous creation of a bainite structure in a carbon steel, particularly in a strip steel

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Hemer, Germany

Michael Hellmann