Dragon Steel Corporation

Taichung, Taiwan

Dragon Steel Corporation

Taichung, Taiwan
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Wang C.-Y.,National Central University | Chiu C.-L.,National Taiwan University of Science and Technology | Tsai K.-Y.,China Steel Corporation | Chen P.-K.,China Steel Corporation | And 2 more authors.
NDT and E International | Year: 2014

In this study, a nondestructive testing method based on stress waves, the impact echo method, was applied to inspect the current thickness of a refractory wall inside a blast furnace. Blast furnaces are high-productivity structures that are prone to internal erosion hazards that majorly affect the lifespan of the blast furnace. Previous studies have applied heat flux and numerical methods to inspect the thickness of the refractory wall. Temperature variations were used to assess the condition of the blast furnace by installing an internal thermometer in the blast furnace during construction. However, these methods result in large errors. In this study, a simple formula using the thickness frequency obtained by the impact echo method was derived to back calculate the current thickness of the refractory wall inside a blast furnace. In this study, the inspection results of the experimental specimen and an in situ blast furnace also shows that inspecting the thickness of a refractory wall using the impact echo method offers substantial practical value. © 2014 Elsevier Ltd.

Peng P.-C.,Dragon Steel Corporation | Wang C.-Y.,National Central University
NDT and E International | Year: 2015

Regularity visual inspections are performed on steel wire ropes of suspension bridges. However, because the steel wire ropes were coated with plastic materials, inspectors could not visually detect the deterioration conditions of the ropes. In this paper, radiation tests and electromagnetic testing were compared. The gamma rays used in the radiation tests were employed to develop two assessment techniques, namely the exposure time formula and sensitivity assessment of steel wire ropes. Actual tests showed that such techniques can be adopted to evaluate the defects of steel wire ropes and help engineers improve the safety of suspension bridges. © 2015 Elsevier Ltd. All rights reserved.

Jang Y.-W.,Dragon Steel Corporation | Tsai C.-N.,Dragon Steel Corporation
EARTH 2015 - Proceedings of the 13th International Symposium on East Asian Resources Recycling Technology | Year: 2015

Steel is the one of the most important invention for human society. It is the necessary material for many products, like automobile, building, engineering equipment, tool for daily use, etc. While 1 ton crude steel is produced, around 0.5 tons by-product will come out. Therefore, the proper handling of by-products generated during the production is an important issue. In Dragon Steel Cooperation (DSC), the steelmaker which has both blast furnace process(BF) and electric arc furnace process(EAF), by-products from different process and characteristics can be divided into various types(mainly slag, dust, sludge and scale) and recycling application. DSC produced around 2.95 million tons of by-products in 2014. Applicati on of by-productsis an important responsibility for steelmaker, which would reduce a large amount of natural resource consumed. Through all means, the overall recycling rate of DSC could reach 99%.

Yang C.M.,Dragon Steel Corporation | Wiegmann V.,SMS Mevac GmbH | Eichert T.,SMS Mevac GmbH
MPT Metallurgical Plant and Technology International | Year: 2012

Dragon Steel Corporation, a member of the CSC group, has erected a modern integrated steelmaking plant in Taichung, Taiwan. Its new BOF melt shop by SMS Siemag is designed for three 220 t converters and a ladle metallurgy center with two RH-TOP plants and four ladle treatment stations. The essential advantages of this compact plant layout are the transportation of the liquid hot metal in open ladles, thus neither a hot metal refilling station nor torpedo cars are required. By applying open ladles instead of torpedo ladle cars for the hot metal transport, the investment costs for transport and maintenance equipment could be drastically cut. Dart-type slag retaining devices and sub-lances complete the converter equipment. A gas cleaning plant, a converter gas recovery plant, refining stations for fine adjustment of the chemical composition of the steel as well as all cars and ladles for handling hot metal, liquid steel and slag are also part of the scope of supply of SMS Siemag.

Chi J.-H.,Wufeng University | Peng P.-C.,Dragon Steel Corporation
Journal of the Chinese Institute of Engineers, Transactions of the Chinese Institute of Engineers,Series A/Chung-kuo Kung Ch'eng Hsuch K'an | Year: 2016

Determining the cause of an arson fire is the most difficult part of fire investigation. In this study, the researcher used various clues and several pieces of fire debris collected from the actual fire site to conduct a series of experiments and analyses in sequence, starting from metallographic analysis to inductively coupled plasma optical emission spectrometry and then a thermal analysis experiment to determine the cause of a fire. It was found that when the temperature was elevated at a rate of 2 °C/min, polyurethane (PU) foam, a structural component of refrigerators, started thermal decomposition. At about 130 °C, the thermal decomposition accelerated, and eventually at 384 °C, about 4883.33 J/g of maximum heat was released. In the end, remaining debris was about 4.96%. Therefore, the combustion of PU foam is an ultrafast type of combustion reaction. The content as well as the experimental procedure of the study is useful for fire investigators in determining the cause of arson fires. © 2016 The Chinese Institute of Engineers

Shenc C.W.,Dragon Steel Corporation
SEAISI Quarterly (South East Asia Iron and Steel Institute) | Year: 2015

It has been a long history of studies on the Rolled in Scales of hot rolled strip. Among them, "Comets" were "very peculiar" because they occurred on the top surface, but on the bottom sur-face at the same location under the larger "comets" was a "mirror image" in colors. By visual ca-tegorization, Optical Microscope, and Scanning Electron Microscope (SEM) analysis, the defect may be caused by intrinsic slab defect, over-worn work rolls of rough mill, or damaged work rolls of finish mill. This defect formed on a strip, redirecting and slowing cooling water therefore introducing regional over-cooling, finally brings itself a Comet-like outlook. Different root causes and solutions were studied in this work. And finally the results have shown the nonconformance rate of "Comets" is declined magnificently.

Dragon Steel Corporation | Date: 2012-07-03

Irons, steels.

Peng P.-C.,Dragon Steel Corporation | Peng P.-C.,China Steel Corporation | Chi C.-Y.,Dragon Steel Corporation | Chi C.-Y.,China Steel Corporation | And 2 more authors.
Materials Evaluation | Year: 2012

An inspection strategy on pipeline sediment was proposed which can instantly distinguish and determine the presence of pipeline sediment by measuring the ultrasonic back echo and recording the variation and changes of regional amplitude. This integration technique has two techniques combined, the ultrasonic wave and gamma ray techniques. Ultrasonic wave emphasizes back echo attenuation and signal alteration, while the gamma ray technique enhances the reading analysis on a radiographic film image. In this inspection, the left half of a 1.3 m pipe was adopted as the inspection area. Because each gamma ray radiographic film was 381 mm in length, four sheets of radiographic film were required in four locations with three ultrasonic inspection spots that corresponded to the pipeline. Twelve spots were inspected in total. UT located the general area of sediment, while gamma ray inspection provided the exact location of sediment. The application of both techniques increased the efficiency and accuracy of inspection.

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