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Paderborn, Germany

Grosse-Heilmann N.,Benteler Steel Tube GmbH | Zylla I.M.,Osnabruck University of Applied Sciences | Kozeschnik E.,Vienna University of Technology | Peters A.,Benteler Steel Tube GmbH
Advanced Materials Research | Year: 2014

In recent years, Quenching and Partitioning (Q&P) became an interesting thermal process route for semi-finished high strength low alloyed steel components. Recent publications demonstrate promising mechanical properties with considerable ductility enhancement. To assess the potential of the two-step Q&P heat treatment in seamless tube production, corresponding tests are carried out on 42SiCrB steel (0.42wt% C, 2.0wt% Si, 1.3wt.% Cr, 0.6wt.% Mn, 0.002wt.% B). Feasible Q&P heat treatment process parameters are identified using the Constrained-Carbon-Equilibrium (CCE) model, carbon diffusion calculations and isothermal TTT curves with previous quenching. Furthermore achieved volume fraction of retained austenite is analyzed by XRD experiments. © (2014) Trans Tech Publications, Switzerland. Source

Rusing C.J.,University of Paderborn | Lambers H.-G.,Benteler Steel Tube GmbH | Lackmann J.,Benteler Automotive | Frehn A.,Benteler Automotive | And 4 more authors.
Materials Today: Proceedings | Year: 2015

The current work investigates the impact of pre-deformation temperatures on the microstructure evolution and the subsequent cyclic stress-strain response of high-manganese steel showing twinning-induced plasticity (TWIP) at room temperature (RT). Deformation at low temperatures increases the hardening rate at low to medium degrees of deformation through concurrent martensitic transformation. In contrast, high temperatures promote dislocation slip. Thus, employing pre-treatments at temperatures below and above RT leads to the evolution of considerably different microstructures. Low-cycle fatigue experiments revealed distinct differences for the pre-treated TWIP steels. © 2015 The Authors. Source

Engel W.,Benteler Steel Tube GmbH | Balun J.,Benteler Steel Tube GmbH
Archives of Materials Science and Engineering | Year: 2014

Purpose: This paper presents results of investigates the formation of scales in the temperature range from 1000°C to 1300°C in the oxidation atmosphere without deformation process. Design/methodology/approach: Oxidized samples were examined by means of EDX Analysis using SEM. Findings: It was found that the oxidation temperature influences the occurrence of the Si-rich phase (Fayalite). Fayalite formed only in the samples oxidized at 1300°C and 1250°C. Oxidation temperatures of 1000°C led to formation of scale enriched with chromium, silicon and nickel in the metal/oxide interface without formation of a new phase. Research limitations/implications: In this study the oxidation behavior in a rotary hearth furnace, which has low oxygen content, is investigated. Furthermore, the formation of scale in high oxygen content (dry air) was explored. Originality/value: The descaling process during the hot rolling of steel alloyed with Si is difficult due to pockmark type surface. Therefore the surfaces quality of the hot rolled products depends on the formation and removal of scales during the production process. © by International OCSCO World Press. All rights reserved. 2014. Source

Hauger A.,Benteler Steel Tube GmbH | Vietoris T.,Benteler Steel Tube GmbH | Bentfeld V.,Benteler Steel Tube GmbH
Stahl und Eisen | Year: 2015

High-grade materials with consistent quality, efficiently and cost-effectively produced, including the customer's needs at the best - these challenges have to he faced by the steel industry and the steel processing industry. Source

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