Sms Schloemann-siemag Aktiengesellschaft

Benteler Steel/tube Gmbh

Meteor Umformtechnik Gmbh & Co. Kg

Goldschmidt Thermit Gmbh

Benteler Deutschland Gmbh

Andreas Peters

Hans-Peter Richter

Meinert Meyer

Jozef Balun

Michael Kaufmann

Andreas Gramer

Isabella-Maria Zylla

Albert Lorentz

Niko Grosse-Heilmann

Ernst Kozeschnik

Kai Oppermann

André Klepel

Christopher Halfpap

Rolf Trittel

Stephane Pauer

The present invention relates to a steel alloy with high energy absorption capacity and good formability, comprising beside inevitable impurities due to smelting and iron the following components in weight percent: In addition, the invention relates to a steel tube product with high energy absorption capacity and good formability, which is characterized in that it at least partially consists of such a steel alloy.

Steel alloy with high energy absorption capacity and tubular steel product

In a heat treatment method for producing boundary layer-hardened long products and flat products of unalloyed or low-alloy steel, the workpiece is cooled for producing a martensitic grain within a boundary layer of the workpiece by repeating several sequential cooling process steps. Each sequential cooling process step has a cooling phase, in which the workpiece is cooled to a temperature below a martensite starting temperature for martensitic conversion of only a portion of the boundary layer of the workpiece, and a temporal stress-relief phase for relieving stress within already formed martensitic grain areas and already formed martensite/austenite boundary areas. Subsequently, the workpiece is cooled at a cooling rate below a lower critical cooling rate for cooling the workpiece core.

Heat treatment method for producing boundary-layer hardened long products and flat products of unalloyed or low-alloy steel

A method of preadjusting cold deforming plants, such as cold rolling trains, skin pass stands, stretcher-and-roller levelers, straightening machines, and the like, wherein the hardness of the material to be deformed is measured shortly before the cold deformation of the material and is utilized for correcting its hardening curve and the preadjustment of the cold deforming plant based on the measurement. The standard hardening curve of a material or a group of materials with corresponding standard values of hardness, yield strength, tensile strength, etc., can be corrected by an additive or multiplicative linkage with a correction member which contains at least one tensile strength determined through the measured hardness value.

Method of preadjusting cold deforming plants

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Düsseldorf, Germany

Andreas Peters