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.

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.

news in steel

For its tandem cold mill, PAO Severstal again relies on the modernization expertise of SMS group

In April 2018, PAO Severstal has contracted SMS group (www.sms-group.com) to modernize the exit section of the tandem cold mill “2100” at its Cherepovets plant in northwest Russia. In the forefront there is the target of full utilization of the maximum possible strip width of 1,850 millimeters.

LKAB develops new technology for producing strategic minerals from mine waste

LKAB is now investing in pilot plant facilities and, together with environmental services company Ragn-Sells, will industrialise an innovative technology for upgrading mine waste from iron ore production. This may result in LKAB producing phosphorus and rare earth metals, which in the EU are classed as strategic minerals that are of particular importance to the industry.

All-round successful electrodes: rare earths and point grinding for orbital welding

The standards for the quality of orbital welding seams are extremely high. In order to ensure they are met, a welding head orbits the round work piece on a circular path. This arc welding technology meets the required standards.

New contract signed by UNGERER with Jiansu Yongjin, Chinese leading company in precision stainless steel strip processing

On 24th April 2018 Jiansu Yongjin Metal Technology Co. LTD. based in Nantong China, has awarded UNGERER Technology GmbH a contract to supply one set of high efficiency Stretch Bend Levelling line for processing precision stainless steel.