Ultrasonic detection of slag carryover during steel transfer operations by David I. Walker

Cover of: Ultrasonic detection of slag carryover during steel transfer operations | David I. Walker

Published by National Library of Canada in Ottawa .

Written in English

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SeriesCanadian theses = Thèses canadiennes
The Physical Object
Pagination2 microfiches.
ID Numbers
Open LibraryOL18682611M
ISBN 100315565810

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Data transfer to and from the slag detection system to improve the steel transfer process. Data to the slag detection system includes tap number, alarm level and fi ve unique variables specifi ed by the steel plant such as charge-number, heat-number, steel grade and tap temperature.

When used, these data are recorded in the saved text data fi Size: KB. While slag has use in the aftermarket in a variety of applications, its presence as a result of the steel-making process causes substantial time, expense and equipment damage.

Until now, it has taken herculean efforts to remove slag. Now, based on recent advances in detection, slag is more reliably and effectively managed. A process for tapping a steel furnace with a reduced amount of entrained slag is disclosed.

During tapping, particles of a slag foaming agent are added. The foaming agent may include calcium carbide and/or other chemicals. The agent foams the slag to decrease its density during tapping and/or to disrupt initial vortex formation at the by: 6. advances in detection, slag is more reliably and effectively managed.

Steel slag, a molten liquid melt of silicates and oxides, is a normal occurrence during the steel-making process, but it is also an expensive and detrimental consequence. Slag is created by the separation of the molten steel from impurities inherent in iron ore and scrap metal. This invention relates to a system and method for minimizing slag carryover while tapping a basic oxygen furnace (BOF) converter during the production/manufacture of steel.

More particularly, this invention relates to the use of an infrared (IR) imaging detector in the -far IR range (i.e. using long wavelengths) to detect the presence of slag.

During the tapping of liquid steel from Electric Arc Furnace (EAF), some slag is carried over into the ladle. High levels of FeO and MnO in slag carryover increase the oxygen activity in steel.

The detection technique is based on processing echoes from the continuous emitted ultrasonic pulses. All of the failed rods are correctly identified, with a false alarm probability smaller than 3%.

A system and method for detecting molten slag in a tap stream between a steel making vessel such as a basic oxygen furnace (BOF) and corresponding ladle. An infrared (IR) imaging or detecting device(s) is used to image/view the BOF-to-ladle tap stream, the stream transmitting energy indicative of whether molten steel and/or slag is in the stream at a given by: An important consideration during steel transfer operations is the formation of vortices in the furnace, ladle, tundish, or mold by means of which molten slag can be drawn Ultrasonic detection of slag carryover during steel transfer operations book one vessel into the next.

Improvements in furnace tapping operations to minimize slag carryover into the ladle and to promote the formation of a more compact tapping Cited by: 1.

Furnace Slag Detection – SlagView for EAF and BOF Alarms warns the operator of slag carryover. At some times during the tap, smoke and fume may obscure the operators view. Used for tap stream imaging and ladle viewing, our standard camera housing is built for the steel plant environment with either dry gas or water cooled configurations.

Slag Manager is online hardware and software that automatically calculates and adds the least cost and technically optimal flux addition Ultrasonic detection of slag carryover during steel transfer operations book every heat of steel. Slag Manager systems can be configured to include raw material supply, material hoppers, and injector stands for each of the flux components.

These versions will undergo additional copyediting, typesetting and review before being published in final form, but are provided to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content.

Keywords:Discriminate, identify and track, slag detection, tapping stream, the quantity of slag. Abstract:When liquid steel is tapped from a basic oxygen furnace (BOF), it is essential to minimize the quantity of slag carry-over, because the high level slag may result in the oxidation and the phosphorus reversion during the secondary metallurgy Author: Zimiao Zhang, Qiu Li, Liwen Yan.

Nondestructive Testing (NDT) consists of a variety of non-invasive inspection techniques used to evaluate material properties, components, or entire process units.

The techniques can also be utilized to detect, characterize, or measure the presence of damage mechanisms (e.g. corrosion or cracks).NDT is also commonly referred to as nondestructive examination (NDE), nondestructive evaluation. Slag detection devices can be used at the ladle-to-tundish outlet that can detect the onset of slag transfer from the ladle to the tundish.

An electromagnetic method in which the slag sensor electromagnetically detects slag in the pouring streams is very efficient and is commonly employed in steel industry. Sonobond: A Leader in Ultrasonic Technology Sonobond is a worldwide leader in the application of ultrasonic welding and bonding technology.

Inthe company—then known as Aeroprojects— received the first patent ever awarded for ultrasonic metal welding. Over the intervening 49 years, Sonobond has earned an outstanding reputation for its.

A Contribution of Phased Array Ultrasonic Technology (PAUT) to Detection and Sizing Stress Corrosion Cracks Author: P. Ciorau, C. Chartier, K. Mair Subject: 7th International Conference on NDE in Relation to Structural Integrity for Nuclear and Pressurized Components.

and internal defect detection in a steel mill. The system is intended to automatically inspect steel, at temperatures in excess of °C, as it moves through the steel manufacturing process.

It is one of the few ultrasonic systems that could ever be used in the harsh operating environment of a steel mill due to its non-contact nature. Mass transfer involves the net movement of mass from one location to another due to a driving force such as a difference in concentration gradient.

It finds extensive application in chemical engineering due to its application in crude oil refining, petrochemical separation and extraction : Cecil Coutinho. Abstract. The use of ultrasonic arrays has increased dramatically within recent years due to their ability to perform multiple types of inspection and due to the fact that phased arrays allow the immediate production of images of the structure through post-processing of received by: 3.

Cracks in alloy steel welds are usually result from improper control or pre-heat or PWHT. PWHT is optional if a F pre-heat is maintained during welding.

The hardness of air hardenable steel alloys should be checked after PWHT. The hardness of carbon steel welds should be checked in services where environmental cracking is a concern. mation of heat transfer in welded workpiece. Latent heat associated with material’s state change and latent heat generated during phase transformations in solid state are taken into account in solution algorithms.

Dilatometric research of S steel is performed to determine con-tinuous-cooling-transformation diagram (CCT) and finalCited by: steel and slag a thermodynamic calculation is implemented into a 2-D cylindrical model of a gas stirred ladle.[10] A third phase, the liquid slag, is incorporated into the model.

The model enables a study of the flow conditions in the slag, in the steel and around the steel/slag interface during gas stirring under vacuum. A detailed. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards. A/AM Practice for Ultrasonic Examination of Steel Forgings. A/AM Practice for Ultrasonic Examination of Turbine-Generator Steel Retaining Rings. A/AM Specification for Steel Forgings, General. which may appear during the manufacturing process.

Ultrasonic NDT of composite materials or multi-layer plastic pipes meets serious problems. An important issue in ultrasonic non-destructive testing of composite fiber-reinforced materials is the detection of flaw echoes in the presence of structural noise due to scattering of ultrasonic waves and.

ISOWelds in steel - Reference block for the calibration of equipment for ultrasonic examination [ISO TC 44] on *FREE* shipping on qualifying offers. ISOWelds in steel - Reference block for the calibration of equipment for ultrasonic examinationPrice: $ Non-Destructive Evaluation of Steel-Structure Using Laser-Generated Ultrasonic p Ultrasonic Non-Destructive Test of Stresses in Rock under High Temperatures Home Key Engineering Materials Key Engineering Materials Vols.

Non-Destructive Evaluation of Steel Stabilization of an embedded fiber optic Fabry-Perot sensor for Cited by: 5. NATIONAL SLAG ASSOCIATION NATIONAL SLAG NSA ASSOCIATION SLAG AND ITS RELATION TO THE CORROSION CHARACTERISTICS OF FERROUS METALS This educational bulletin is intended to provide technical information for members of the Size: KB.

piece with discontinuities characteristics of this type of joint. The detection and characterization, in size and location, of these discontinuities allowed the validation of the inspection system developed.

Key-words: Nondestructive testing, Phased Array, austenitic steel, low thickness, automated inspection system 1. Introduction. One of the most important variables for ultrasonic welding is amplitude. While recommended amplitude guidelines are available for many generic materials based on accumulated industry experience, use of specialized and newly developed materials is rapidly increasing.

To that end, it is desired to have a method for experimentally determining the minimum amplitude required for a [ ]. Purchase your copy of BS as a PDF download or hard copy directly from the official BSI Shop. All BSI British Standards available online in electronic and print formats.

BS - Methods for ultrasonic detection of imperfections in steel forgings. Ultrasonic Phased Array Inspection Technology for the Evaluation of Friction Stir Welds. C R Bird TWI, Cambridge CB1 6AL, UK. Paper published in Insight, vol, issue 1, January Abstract. This paper is based upon a project 'Qualistir' TM for the on-line quality control of FSW in Aluminium.

Qualistir is a collaborative project lead by R. Start studying Operations set 1. Learn vocabulary, terms, and more with flashcards, games, and other study tools. ___Rapid fluctuations of the boiler water level that can lead to priming or carryover. Caused by impurities on the surface of the boiler water.

___Water level carried in the boiler gauge glass during normal operation. Ultrasonic inspection of spot welds has historically been a challenge. New materials have sometimes hindered or have become a roadblock for traditional inspection techniques.

The advent of the digital ultrasonic instrument provides the ability for computer-assisted decision-making, signal processing, and algorithms for interpretation and weld. treatments during fabrication and assessment of damage during service due to various degradation mechanisms [2].The application of the signal processing methods allows the detection of interfaces and hence the location of ound method for the evaluation of acoustoelasticity in stressed and elastically deformed.

Control of Cr-loss to the Slag Phase in High Alloy Steelmaking this was used in each experiment. The amount of slag which was added in each experiment corresponded to 5% in weight of the steel taken.

The steel and the slag were melted under the Ar atmosphere and the oxidant gas was blown into the liquid metal at K. Gas. The detection of inclusions or small defects located below the surface of cast slabs is addressed in this paper.

The technique combines laser-ultrasonics and synthetic aperture data processing for inspection on descaled slabs. An improved synthetic aperture data processing (F-SAFT) performed in the Fourier domain which includes the control of the aperture as well as spatial Cited by: 4. Laser-induced breakdown spectroscopy (LIBS) is applied for the inline analysis of liquid slag at a steel works.

The slag in the ladle of a slag transporter is measured at a distance of several meters during a short stop of the transporter. The slag surface with temperatures from ≈ to ≈ °C consists of liquid slag and solidified slag by: using ultrasonic testing in the film-bonded specimen.

MENTAL PROCEDURES Specimens Chemical compositions of medium carbon steel (S45C) used as the base and the pure copper film are shown in Table 1. Material properties of the base, film and the epoxy resin employed as an adhesive are shown in Table 2. Using. Laser-EMAT (ElectroMagnetic Acoustic Transducer) ultrasonics is a suitable technique for on-line surface and internal defect detection in a steel mill.

The system is intended to automatically inspect steel, at temperatures in excess of degrees C, as it moves through the steel manufacturing process. It is one of the few ultrasonic systems that could ever be used in the harsh operating.

Ultrasonic methods use high frequency mechanical waves to interrogate the structure and properties of materials. As a result, ultrasonic waves are capable of characterizing the response of materials during high frequency loading and can characterize structure at fairly small sizes.Ultrasonic Metal Welding - Principles and applications of high-grade bonding technology.

21 September, - — Chris Stapla's comprehensive textbook of ultrasonic metal welding technology, available on-line or as a free download.Steelmaking. Investigation on the source of surface inclusion defects in SPHC hot rolled coils by slag tracer method.

Chengsong Liu1, 2, Shufeng Yang*1, 2, Jingshe Li 1, 2, Xiaojie Gao1, 2, Linzhu Wang1, 2 (1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing.

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