Development Of Steel Products Research Articles

Cross-effect of surface finishing and deep cryogenic treatment on corrosion resistance of AISI M35 steel

The improvement of corrosion lifetime of commonly used steels is an important characteristic that is required for development of steel products for usage in non-traditional corrosion environments and specialized applications such as oil and gas industry. In order to achieve the required enhancements in a versatile manner, a combination of material and surface processing schemes can be used. In this research, the effect of surface finishing (original, polished, etched and immersed in LN2) on corrosion behavior of steel AISI M35 is investigated. Furthermore, the change of corrosion properties with the application of deep cryogenic treatment (DCT) is researched and compared with the effect of conventional heat treatment (CHT). The various surface finishing induce modified corrosion product development and degradation of material. The surface finishing with contributing nitrogen presence (etching and immersion in LN2) display significant suppression in development of corrosion products related to the formation of green rust. On the other hand, DCT induces microstructural and mechanical changes, which also influence the corrosion dynamics. DCT is confirmed to reduce exfoliation of the corrosion product layer due to reduced surface cracking induced by residual stress-of the microstructure. Additionally, DCT reduces pitting formation and growth, resulting from the changed alloying element concentration and microstructure. The cross-effect of both nitrogen-introducing surface finishing and DCT have the most positive influence on corrosion properties of steel AISI M35. The modifications lead to improved self-corrosion protection and stability of the surface resulting in increased durability of AISI M35 in saline corrosive media.

Resource and energy saving technology for producing high-quality steel castings with heat-time treatment

Today, the current direction in the development of steel production is resource and energy saving. So, one of the problematic issues in the steelmaking process is to reduce the consumption of ferroalloys. The possibility of improving the quality of castings, due to the heat-time treatment of the melt is considered. The melt is overheated to high temperatures by holding in the furnace. Because of that, the yield of suitable products increases, the metal consumption of products decreases.

Prediction of mechanical stress in roller leveler based on vibration measurements and steel strip properties

The continuous development of steel products generates new challenges for the maintenance of manufacturing machines in steel mills. Substantial mechanical stress is inflicted on the machines during the processing of modern high-strength steels. This increases the risks of damage and flaws in the processed material may appear if the capability of a machine is exceeded. Therefore, new approaches are needed to prevent the machine condition from deteriorating. This study introduces an approach to the prediction of mechanical stress inflicted on a roller leveler during the processing of cold steel strips. The relative stress level is indicated by features extracted from an acceleration signal. These features are based on the calculation of generalized norms. Steel strip properties are used as explanatory variables in regression models to predict values for the extracted vibration features. The models tested in this study include multiple linear regression, partial least squares regression and generalized regression neural network. The models were tested using an extensive data set from a roller leveler that is in continuous operation in a steel mill. The prediction accuracy of the best models identified indicates that the relative stress level inflicted by each steel strip could be predicted based on its properties.

Economic and Qualitative Determinants of the World Steel Production

The aim of this paper is to highlight the influence of economic and qualitative factors on steel production globally, as well in the EU, US, and China, using a dataset corresponding to the period 2000–2015. The research methods used are the study of specialist literature, problematisation, modelling, and simulation using Statistical Package for the Social Sciences (SPSS) software. The main conclusion of this paper is that, on long term, the steel production is largely influenced by the rate of real economic growth and by car production, even if in the short term the correlation is not obvious. Likewise, qualitative factors affect the steel industry in the context of current regulations on reducing carbon emissions and ensuring sustainable development. An additional aim of the present study is to define entropy in the sustainable development of steel production, as well as illustrate some of its properties and the quality management modelling of the research process in steel production.

Stereological Characterisation of Steel Wide Strip Microstructures

The continuous development of steel products requires the detailed investigation of relationships between the production technology, microstructure, and mechanical properties. This paper describes the detailed characterisation of normalising rolled and of thermomechanically rolled steel wide strip microstructures and presents the relationship between their microstructures and their mechanical properties. The morphology of the microstructures were characterised by using an image analyser. The most important measured stereological parameters were the area, perimeter, length and breadth of the ferrite and pearlite cross-sections.

From Substrate to Coating: Micro- and Surface Analysis Techniques for the Development of Steel Products

For the development of ultra high strength steel and hyperdrawable steel grades precipitates had to be tailored at the nanoscale. Microbeam techniques helped to reach a superior quality of metallic coatings and a superb adhesion to the steel substrate. In this paper the use of micro-analytical techniques in steel product development is illustrated.

Prospects for the development of steel production

Prospects for the development of steel production

Iron Ores, Coal, and Steel Production in New Zealand: ABSTRACT

The present status of knowledge of iron ore and coal deposits in New Zealand is discussed with emphasis on titaniferous iron-sand ore and subbituminous coal. Development of steel production, first from scrap steel and subsequently from titaniferous iron sand, is described in relation to local logistic factors, market requirements, and development of production technology to suit local raw material characteristics. Possible future trends in production, marketing, and technology, and possible applications of the technology in other Pacific countries are mentioned briefly. End_of_Article - Last_Page 1449------------