9th ECCC European Continuous Casting Conference – ECCC 2017

For the casting of Nb-mikroalloyed steels with C- content >0.09 mass-% the transverse crack formation on the slab surface is a big problem. The production practice at voestalpine shows that these crack formation is dependent on the content of microlalloyed elements like Nb, Al, B, V and N -content. Higher content of micro alloyed element causes more crack formation. In the present work,...

Previous studies have shown that the application of mechanical strain over a long period of time can facilitate precipitation of microalloyed particles. Hence there is a need to clarify whether casting with a multiple straightening scheme rather than a bending/unbending design could be detrimental for the quality of CC of microalloyed steel grades, due to the time extension of the deformation...

An improvement of surface quality of casting slab increases productivity of steel. The slab surface sometimes has transverse cracks along a grain boundary when the slab is bended and/or unbended around the transformation temperature from austenite phase to ferrite one. This defect is mainly caused by film-like ferrite and carbide and/or nitride precipitations around the grain boundary and...

Micro alloy steels are an important product within the automotive, energy, pipeline and structural segments. Superior continuous cast bloom quality is critical in order to achieve the high quality strength and toughness balance required for today’s demanding bar, plate and sheet applications. Continuous casting parameters, such as super heat, mold level fluctuation, heat transfer, fine grain...

The In-Situ Material Characterization–Bending (IMC-B) test is a new laboratory method to evaluate the susceptibility of steel towards transverse crack formation in the continuous casting process. Samples are cast under near process conditions, cooled to bending temperature in a controlled way and finally bent in a 3-point bending test with a deflection of only a few millimeters, according to...

Within the scope of the collaborative research center SFB 761 “steel ab initio” the castability of high manganese steel grades with varying aluminum and manganese contents via the continuous casting (CC) route is under investigation. Within the current research the high temperature embrittlement of these high manganese steels in the temperature range of 700 °C – Tliq has been examined, using...

TWIP (Twining Induced Plasticity) steel is very promising AHSS (Advanced High Strength Steel) grade owing to its superior toughness and ductility. Recently it has attracted the interest of the automotive and steelmaking industries, as the need for reducing weight to provide better fuel efficiency is of paramount importance with the gradual depletion of fuel resources. But these steels are...

The hot ductility trough experimental data of as melting samples has been quite well adjusted by the quantity of MnS precipitated in the solid, the MnS secondary precipitation. A numerical model has been developed to calculate the MnS primary precipitation during solidification, secondary precipitation in the solid during the ulterior cooling. The model calculated MnS secondary precipitation...

The thin solidifying shell in the meniscus region of continuous caster deforms due to severe contraction of steel during solidification for near peritectic composition of steel and there is potential risk of cracking and in the extreme cases, breakout of shell. The main purpose of the present study was to contribute an improved understanding of peritectic transformation through high...

IDS is a thermodynamic-kinetic-empirical tool for solidification, microstructure and material properties of steels, which has been developed at Aalto University in Finland since 1984. IDS calculates phase fractions, phase transformations and several solidification, cooling and reheating related phenomena, including inclusions and precipitates from liquid state to room temperature and during...