Rare earths (RE) have been used to improve the high temperature oxidation resistance of low alloy steel containing elements like Cr, Al, V and Mo. Further, the RE can be added either to the alloy or by applying as an oxide coating to the alloy surface. In this study the high temperature oxidation resistance of rare earth (RE) oxide coated 1Cr-0.3Mo-0.25V alloy was determined. This paper presents the influence of surface additions of nano-crystalline oxides CeO2 on the isothermal oxidation behavior of 1Cr-0.3Mo-0.25V alloys at temperatures ranging from 600 °C to 900 °C. The oxidation rate of RE oxide coated1Cr-0.3Mo-0.25V was significantly lower than that of the uncoated alloy. The improvements in oxidation resistance are the reduced oxidation rates and the increased oxide scale adhesion. Scanning electron microscopy (SEM), X-ray diffractometry (XRD), and electron probe micro analyzer (EPMA) were employed for these analyses. The scale formed in the presence of RE oxides was very thin, fine grained and adherent.

Incremental forging processes like radial forging become more and more crucial in industry due to their outstanding economic performance, their high flexibility and their advantageous compressive stress states. However, nowadays a basic method to analyze forging processes, FEM simulation is still a very time consuming procedure and needs complex models to implement incremental processes. Especially long term studies with focus on tool temperature development during several hours of production cannot be performed with classical FEM models for radial forging. The main problem in modelling is the high operating frequency of the forging devices, which leads to small necessary time steps and, therefore, to inacceptable calculation time due to numerous simulations that have to be run to complete a cogging process sequence. Steady state in die temperature is often only reached after processing several workpieces. Hence, it is necessary to use a simplified FE-model of the forging process to predict the steady state temperature of the forging dies. In the present work a simplified FE-model is established to investigate the steady state temperature of the dies. This approach is verified by metallographic studies proving its accuracy.

High-manganese steels are characterized by high ductility, strength and work hardening resulting from the formation of strain induced martensite (TRIP-effect) or twins (TWIP-effect). A third type is shear band induced plasticity (SIP) in Triplex steels. The Mn-content ranges from 15 to 30 %. Mn and additions of C, Si and Al exert a strong influence on the microstructure and the deformation mechanism and can accordingly affect both strength and ductility. The max. carbon content can be around 1.2 %. The main interest is currently concentrating on TWIP steels. Production of these grades via the conventional steelmaking routes can raise problems and, therefore, modifications and/or alternative production methods have to be applied. With respect to their extreme strength levels, high-Mn steels exhibit an extraordinary forming potential. Welding involves some specific challenges. The possible occurrence of delayed fracture is discussed. High-Mn steels have to compete with other lower alloy steels and special stainless grades with the same objective targets. Referring to this, the laboratory and industrial trials are to be continued in order to fully exploit the considerable market potential of the new steels.

A process for electroless deposition of NiP films on a transparent non-conductive soda lime glass is investigated. The process requires at least two repetitive cycles of etching and activation. The annealing process of the NiP films at 400 and 600˚C has been studied and the optimal heat treatment condition has been established. Different Ni bath with different pH has been employed to assess the NiP deposition. Characterization of the deposits by optical and scanning electron microscopy has provided information on the nature of crystallites and on the surface topography.

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.

news in steel

Against Residue and Moisture:  Combination of Filter System and Moisture Detection doubles the life of Quenching Oil

For the Heat Treatment- and Hardening industry clean quenching oil without moisture is essential for an effective process. The value of clean oil is often underestimated.

SCHMOLZ + BICKENBACH and TSINGSHAN to form Joint Venture in China

SCHMOLZ + BICKENBACH, a global leader in special long steel, and TSINGSHAN GROUP ("TSINGSHAN"), a world leader in stainless steel, today announced the formation of a Joint Venture ("JV") in China. The JV company is 60 percent owned by SCHMOLZ + BICKENBACH and 40 percent by TSINGSHAN and will operate under the name Shanghai Xinzhen Precision Bar Co. Ltd. out of Shanghai (China).

SSAB invests in carbon-dioxide-free internal transport

SSAB in Oxelösund, TFK Transport Research Institute and Kalmar, a part of Cargotec, are to initiate a unique multimillion-SEK project to develop and test carbon-dioxide-free internal transport powered by hydrogen and fuel cells.

Longer service life and improved arc focusing: the world’s first electrode developed especially for aluminium welding

Even though the processing of aluminium is very different from other metals and, for example, the correct welding temperature has to be maintained with especially high precision, there has not been an electrode to date designed especially for this field of application.