JSW Steel Limited is a 10.0 Mtpa integrated steel plant and 2 corex & 4 blast furnace forms the main iron making units. Sinter and pellet are the main iron bearing feed to iron making units. JSW Steel Limited operates with a 4.2x2 Mtpa pellet plant and the production rate of each pellet plant is ~500t/hr. Pellet plant utilizes 100% beneficiation plant (BP) product for pellet making. Beneficiation plant product size (pellet grade fines) is coarser (-45micron - 40 to 45%) in nature. Optimum particle size of the raw material is required to get the desired properties of the pellets. BP plant has set up two number of ball mill to get the optimum particle size for pellet making. Pelletisation studies were carried out in laboratory by varying the ball mill discharge size from 52 to 68% -45micron size to optimize the pellet grade fines size to achieve desired physical and metallurgical properties of the fired pellets. The desired physical and metallurgical properties of the pellets were obtained with the iron ore fineness 64% -45micron size due to presence of well balanced mineralogical phases.

Failure assessment was made on cylindrical pressure vessels containing longitudinal weld misalignment performing finite element analysis (FEA) utilizing the Ansys software package. A 20° section of the cylindrical shell wall was modeled utilizing the plane strain element (plane 182) with the longitudinal weld in the centre of section. The weld misalignment was introduced by shifting the position of the cylindrical section on one side of the weld relative to the other section. Failure pressure estimates from FEA based on the global plastic deformation are found to be in good agreement with existing test results on vessels made of Afnor 15CDV6 steel and maraging steels.

Steel history and its chronological progress have been reviewed from different aspects on many published papers, and books and it can be found on many websites. However, one historical aspect of this topic, which has received limited attention, is the gradual progress in knowledge of controlling cooling rate to get the desirable thermal and mechanical properties for the steel products. This paper presents some evidence of understanding the effect of cooling rate on the material properties from Iron Age era. It also discusses briefly the importance of determining optimimum cooling rate in enhancing the production rate.

This paper discusses the major sources of residual stress generation in the steel microstructure during cooling process of as-cast steel (slabs, blooms, and billets). The stress configuration of the steel microstructure changes during quenching due to stresses introduced to the microstructure by these sources. The influence of each source in increasing the stress distribution within the microstructure during quenching is explained via corresponding formula and qualitative discussion in separate sections. The stresses accumulated during cooling may introduce the residual stress concentration zones in the microstructure of the steel.
These stress concentration zones may result in flaws, microcracks or voids formation. Consequently, it may lower the soundness of the steel and cause deviation of the thermo-mechanical properties of the cast steel from the initially designed and customer desired specified properties.

The control of non-metallic inclusions is an important tool for steel properties optimization. Most related actions of this control involve the prevision of the slag-metal and inclusion-metal equilibrium, aiming at implementation of operational practices to obtain a more adequate inclusion profile.
Computational thermodynamics has proved to be a powerful tool in the prevision of equilibrium in different metallurgical systems, especially in the metal-oxide system in question. The aim of this work is to present the application of computational thermodynamics in the study of formation and control of non-metallic inclusions in steels, mainly during secondary refining. This work shows that the careful application of computational thermodynamics can drastically reduce the empirics in the process development for the control of non-metallic inclusions in steels, contributing to an increase in the efficiency of the process manufacture, to improve the present product quality and to enable the economic development of new products.

news in steel

NLMK Group, Russia, commissions SMS group to supply a thick slab caster

NLMK Group has contracted SMS group (www.sms-group.com) to supply a new thick slab caster for its steel mill no. 2 in Lipetsk in Central Russia.

JAK-Metalli named Swedish Steel Prize 2018 finalist

For developing a new cutting solution for vegetation management that is safer, less energy intensive and more durable, JAK-Metalli has been nominated for the Swedish Steel Prize 2018.

Another successful partnership between industry and the university

Already a model for success: In addition to the recently extended partnership with the Materials Science Department at the University of Saarland, AG der Dillinger Hüttenwerke (Dillinger) is supporting another ambitious research project: The Department of Numerical Mathematics at Saarland University is studying the modelling of the cooling process of premium heavy plate at Dillinger.

thyssenkrupp Schulte rolls out Cargoclix TimeSlot System

Successful test phase in Nuremberg / Materials distributor to introduce Cargoclix "TimeSlot" system at 30 sites