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View of June' 2008 Issue ======================= Instrumented Drop Weight Tear Test By Nick Osborne, Technical Director, Imatek Ltd. ABSTRACT The drop weight tear test (DWTT) has been in use for over 40 years now, as a practical laboratory-scale way of ensuring that steel used in the manufacture of line-pipe is not subject to brittle failure when in service. It is one of a battery of tests that assess the suitability of steel for a particular application, another of which is the Charpy V-notch (CVN) test, from which the upper shelf energy (USE) has commonly been used as a measure of the ductile fracture resistance. Since the introduction of the DWTT, materials have moved on. In particular, demands for high operating pressures of line-pipes and larger diameters have driven the development of higher strength steels. Forty years ago the work that led to the drop weight tear test was done on X52 steel (360MPa yield strength). Improvements in thermo-mechanical processing has yielded improvements of approximately 10,000psi per decade, to the point where the state of the art is now X100 steels, and the use of X120 steels is being considered. Quenched and Tempered Low-Alloy Steel By Dr. D.Venkata Ranga Reddy - LDRP Institute of Technology & Research Gandhinagar, Gujarat ABSTRACT Alloy steels are defined as those steels that: (1) contain manganese, silicon or copper in quantities greater than the maximum limits (1.65% Mn, 0.60% Si, and 0.60% Cu) of carbon steel; or (2) that have specified ranges or minima for one or more other alloying additions. The low-alloy steels are those steels containing alloy elements, including carbon, up to a total alloy content of about 8.0%. Low-alloy steels with suitable alloy compositions have greater hardenability than structural carbon steel and, thus, can provide high strength and good toughness in thicker sections by heat treatment. Their alloy contents may also provide improved heat and corrosion resistance. Siemens VAI Metals and Mining Technologies organised their 2nd worldwide media summit titled - Global Sustainable Competence from 4th–6th of June 2008 at Cracow in Poland By Nirmalya Mukherjee, Editor, Steel & Metallurgy ABSTRACT Siemens VAI Metals Technologies (MT), a business unit of the Siemens Division Industrial Solutions, is the leading engineering and plant-building company for the iron and steel industry as well as for the flat-rolling sector of the aluminum industry and for open-cast mining. Siemens VAI, which was created from the integration of Voest-Alpine Industrieanlagenbau, Linz/Austria, plus the electrical engineering product business and automation solutions of Siemens, provides a comprehensive range of supplies and services for all related technological processes and integrated automation solutions for the entire life-cycle of metallurgical plants. Site Designed & Hosted by Amitech India® -
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