Iron & Steel Technology
Long Products Rolling Technologies
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Table of Contents
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100
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A new combination bar, bar-in-coil and wire rod mill has recently been commissioned at YongXing Special Stainless Steel Co. Ltd. in China, for production of numerous stainless grades, including austenitic, ferritic, dual-phase and hardening steels. The new rolling mill has capabilities for rolling products from 4.5 to 130 mm, with quenching and heat treatment facilities to maximize in-line processing. The mill also includes new innovations such as stepless coil reforming for wire rod and optical bar counting. YongXing is now able to meet the demands of customers seeking special grades for applications in industries such as aerospace and petrochemical.
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112
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A new approach was presented concerning a method for calculating mechanical properties for microalloyed, medium-carbon wire rods and bars. The proposed equations considered chemical composition, ferritic grain size and carbonitride precipitation. A model for microstructure evolution was used to estimate austenite grain size and the amount of microalloying elements in solution before the austenite transformation to ferrite. A 0.3%C-0.02%Nb-0.11%V steel was used for industrial validation. Results for tensile properties from rolled samples could be predicted with reasonable accuracy, allowing the use of the method in a current industry line.
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122
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This study focuses on the design and improvement of welding wire rod grade for gas metal arc welding wire applications that are all covered by imports in Turkey. During the design and experimental studies, JMatPro software and Gleeble 3500 thermal simulators are used to describe the continuous cooling transformation and time temperature transformation curves and for simulating Stelmor® line parameters. Besides optical microscope, scanning electron microscope energy-dispersive x-ray spectrometry and electron backscatter diffraction are used to describe the brittle phases. Experimental studies are also verified by industrial trials. Finally, the optimum process parameters to produce this wire rod grade without any brittle phase are determined by satisfying customers’ demands.
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136
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One of the issues in manufacturing seamless steel pipes is the prevention of inner surface defects. It is well known that this is caused by the Mannesmann effect. Therefore, techniques to prevent ductile fracture caused by the Mannesmann effect have been investigated. In this report, it is shown that the effect of the plug position, which is one of the rolling conditions on the reduction of fracture, is obtained by numerical analysis. As a result, it was found that defects could be reduced under the low reduction condition with the plug located at the advanced position.
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142
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results are difficult to understand. The results of inspection provide information regarding the location of the macroinclusions and therefore their distribution throughout the material. However, establishing criteria to classify the material’s purity has been a difficult task. This paper aims to establish a data analysis tool to be used for quality control of materials. The results show a statistical and metallurgical feasibility of applying this analytical model to evaluate the level of purity of hot-rolled steels.
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152
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Robotic tagging applications can be utilized to reduce manpower costs and improve the safety and quality of final end products. This paper presents an overview of the available technologies, such as vision systems, artificial intelligence and robotics.