Macro-Segregation in Steel Ingots...

Macro-Segregation in Steel Ingots With the large scale reduction of the crude steel production through the ingot casting route, there is now-a-days a tendency of producing extremely heavy weight steel ingots weighing over 600 t and continuous cast strands with thickness over 450 mm and rounds with diameter over 800 mm. These large size crude steel products are mainly applied for retaining components like reaction vessels for nuclear power plant and rotating components such as drive shafts of gas turbines and generator rotors. These high value products require high quality of the as-cast crude steel products, and hence, the production of the heavy crude steel products with adequate control of the quality is a big concern for steelmakers worldwide. The macro-scale segregation of alloying elements during the casting of steel ingots continues to afflict the manufacturers of steel ingots, despite many decades of research into its prediction and elimination. Defects such as A-segregates are still common, and components are regularly scrapped due to their presence, leading to increased economic and environmental costs. With the growth of the nuclear power industry, and the increased demands placed on new pressure vessels, it is now more important than ever that today’s steel ingots are as chemically homogeneous as feasible. During the solidification of alloys (liquid steel), solute is partitioned between the solid and liquid to either enrich or deplete the inter-dendritic regions. This obviously leads to variations in the composition on the scale of micro-metres (micro-segregation). Macro-segregation is a composition inhomogeneity in the scale from several millimeters to centimeters or even meters. The effects of macro-segregation are critically important in the present day applications of steel ingots and hence the ability to predict segregation severity and location is very important and highly sought after these days. Almost...

Marketing, Marketing Plan and its Elements...

Marketing, Marketing Plan and its Elements Marketing refers to the activities of the organization associated with promoting and selling of its products and services. It includes advertising, selling, delivering products to the customers, and market research. In fact, it is everything which the organization does to acquire customers and maintain a relationship with them. An efficient marketing cultivates sound business strategies, allows for successful innovation, increases the effectiveness of promotional strategies, and strengthens the brand image. The main purpose of the marketing is not only to maintain the relationship with existing ones but also to attract new customers. The process of interaction between the marketing men and the customers presents the dialogue between them and assumes the exchange of values. Marketing plan is one of the major and extremely significant of the organizational business planning process since it is the marketing which brings success in the long term, particularly, continuous growth in the earnings of the organization. Marketing plan has an input in defining efficiency in customer satisfaction terms.  It also helps to identify core products/services which meet the needs of the target segments of the organization. For understanding the theory related to the marketing and the marketing plan it is first necessary to understand its elements. These elements are (i) marketing mix, (ii) branding strategy, (iii) competitor and market analysis, (iv) customer decision making process, and (v) sales plan. Marketing mix Marketing mix is a theoretical framework which defines four indicators in arranging the offerings to meet the needs of the customers. These indicators are (i) product, (ii) place, (iii) price, and (iv) promotion. These indicators are also known as 4 Ps. The concept of 4 Ps is considered to be powerful due to the reason that it makes marketing process simpler and allows having...

WTA technology for drying of lignite coal Jul27

WTA technology for drying of lignite coal...

WTA technology for drying of lignite coal WTA (Wirbelschicht Trocknung Anlage) technology for drying of lignite coal has been developed by German company RWE Power AG. WTA is the German abbreviation which stands for fluidized-bed drying with internal waste heat utilization. RWE Power AG holds a good number of patents on this technology. The first steam-fluidized bed dryer was developed by RWE as the WTA-1 demonstration plant at Frechen near Cologne, Germany,  with a throughput capacity of 53 tons per hour of raw lignite coal having a grain size of 0 mm to 6 mm and an evaporative capacity of 25 tons per hour. During the 20,000 hours of test operation from 1993 to 1999, the WTA-1 demonstration plant along with the vapour compression system for drier heating (employed for the first time worldwide in lignite coal applications) has proved to work extremely well and reliably. Further theoretical work and an evaluation of the test operation of the WTA-1 plant revealed further potential for the technical and economic process optimization. Several alternatives of development were considered and it was revealed that a reduction of the grain size held most potential for further improvement. In 1999, RWE built a test plant called WTA-2 for the fine grained WTA process directly next to the WTA-1 plant in Frechen. This new plant had a design capacity which was increased in several optimization steps from originally 16.4 tons per hour of raw lignite coal throughput and 8 tons per hour evaporation capacity to a raw coal throughput of 28.7 tons per hour and a water evaporation capacity of 13.1 tons per hour during the total of 8,200 hours of operation of the plant by 2011. Based on the extensive experience from the operation of the WTA-2 plant with...

Steel ingots and their Casting during Steelmaking...

Steel ingots and their Casting during Steelmaking Ingot casting is a conventional casting process for liquid steel. Production of crude steel through the ingot casting route constitutes a very small percentage of global crude steel production. However, the method of casting of the liquid steel in ingot moulds is still fundamental for specific low-alloy steel grades and for special forging applications, where products of large dimension, high quality or small lot size are needed. Typical application for conventional ingot casting includes the power engineering industry (e.g. shafts for power generation plants, turbine blades), the oil and gas industry (conveying equipment, seamless tubes), the aerospace industry (shafts, turbines, engine parts), ship building (shafts for engines and drives), tool making and mechanical engineering (heavy forgings, cold, hot and high-speed steels, bearing, drive gears) as well as automotive engineering (shafts, axes). As the demand of heavy ingot increases nowadays, especially from the power engineering industry and ship industry, there is a tendency of producing extreme large ingots over 600 t and continuous cast strands with thickness over 450 mm and rounds with diameter up to 800 mm, which are mainly applied for pressure retaining components such as reaction vessels for nuclear power plant and rotating components like drive shafts of gas turbines and generator rotors. The moulds used for casting of ingots are made of cast iron. Cast iron is used for the production of the mould since the thermal coefficient of cast iron is lower than that of steel. Because of this property of cast iron, liquid steel on solidification contracts more than cast iron which makes detachment of ingot easier from the mould. Inner walls of the mould are coated by either tar or fine carbon. The coated material decomposes during solidification and this prevents sticking...

Business plan for the organization...

Business plan for the organization Business plan for an organization is the document which determines the organizational objectives, strategies and projected actions in order to promote its survival and development within a given time frame. Business plan also focuses on two key aspects namely (i) dealing with risks, and (ii) making profits. Business planning process requires deep investigation, careful evaluation of all factors, which might have an impact on the result, and study of possible results of the actions of the organization. In addition business plan determines management actions for expansion process, designs new ways of for management action and includes revision of all the operations of the organization. Business plan enables organizational management to demonstrate to stakeholders, including founders and investors, that there is potential for considerable growth of the organization in a large market. It also illustrates that the organization is capable of achieving significant market power with a sustainable and differentiated product or service offering. Business plan consists of a comprehensive, written description of the business of the organization. It is a detailed document describing the products or services of the organization, production techniques, markets and customers, marketing strategy, human resources, organization of important activities, requirements in respect of infrastructure and supplies, financing requirements, and sources and uses of funds. Business plan describes the past and present status of the organizational business, but its main purpose is to present the future of the organization. It is normally updated frequently and looks ahead for a period of three to five years normally, depending on the type of business and the kind of the organization. It is a crucial document needed for getting funding support from financial institutions and hence it is required to be complete, sincere, factual, well-structured and reader-friendly document. There...