The document summarizes key aspects of secondary steelmaking processes. It discusses homogenization through ladle stirring using argon bubbling or electromagnetic stirring. Degassing processes like ladle degassing and circulation degassing are also covered, which are used to remove gases from steel. Other secondary steelmaking stages discussed include heating in the ladle furnace, deoxidation using aluminum, decarburization in vacuum degassing, and desulphurization in the ladle through slag-metal reactions. Injection metallurgy techniques like powder injection and wire feeding are also summarized for adding alloying elements to molten steel.
Effect Of CaO, FeO, MgO, SiO2 and Al2O3 Content of Slag on Dephosphorization ...karun19
Phosphorus has atomic number 15 and it can give up all 5 electrons from its outermost shell to become P5+ or accept 3 electrons to become P3- to attain stable configuration.
This means that phosphorus can be removed both under oxidizing as well as reducing conditions.
But removal of phosphorus under reducing conditions is not practical since its removal is highly hazardous.
Thus P removal is practised mostly under oxidizing conditions(i.e. in Basic Oxygen Furnace).
1.This slide is about causes of breakouts during continuous casting of steel and remedies about the same
2. It will help to reduce breakouts problem during continuous casting of steel up to 80%
Overview on electromagnetic field (EMF) and radio frequency (RF) sources in real estate transactions. Description on EMF and RF measurements, testing and evaluations methods.
Effect Of CaO, FeO, MgO, SiO2 and Al2O3 Content of Slag on Dephosphorization ...karun19
Phosphorus has atomic number 15 and it can give up all 5 electrons from its outermost shell to become P5+ or accept 3 electrons to become P3- to attain stable configuration.
This means that phosphorus can be removed both under oxidizing as well as reducing conditions.
But removal of phosphorus under reducing conditions is not practical since its removal is highly hazardous.
Thus P removal is practised mostly under oxidizing conditions(i.e. in Basic Oxygen Furnace).
1.This slide is about causes of breakouts during continuous casting of steel and remedies about the same
2. It will help to reduce breakouts problem during continuous casting of steel up to 80%
Overview on electromagnetic field (EMF) and radio frequency (RF) sources in real estate transactions. Description on EMF and RF measurements, testing and evaluations methods.
Mechanism of Failure of Pipeline Steels in Sour Environment - MITACS GlobalinkAbhishek Kumar
X70 pipeline steel was electrochemically charged with hydrogen for different durations in order to find crack nucleation and propagation sites. After 3 hours charging, suitable regions for crack initiation and propagation were found. These regions were studied by OM, SEM , EDS and later Vicker hardness test was done. The results brought out that HIC cracks nucleated from regions rich of inclusions and further propagated through the segregation area of some elements, such as manganese, carbon, silicon and sulfur. It is worth-mentioning that all these potential sites for crack nucleation and propagation appeared at the centre of cross section of the specimens. Additionally, cracked area has harder phase than the non-cracked area which was confirmed by hardness test.
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
TECHNICAL TRAINING MANUAL GENERAL FAMILIARIZATION COURSEDuvanRamosGarzon1
AIRCRAFT GENERAL
The Single Aisle is the most advanced family aircraft in service today, with fly-by-wire flight controls.
The A318, A319, A320 and A321 are twin-engine subsonic medium range aircraft.
The family offers a choice of engines
Event Management System Vb Net Project Report.pdfKamal Acharya
In present era, the scopes of information technology growing with a very fast .We do not see any are untouched from this industry. The scope of information technology has become wider includes: Business and industry. Household Business, Communication, Education, Entertainment, Science, Medicine, Engineering, Distance Learning, Weather Forecasting. Carrier Searching and so on.
My project named “Event Management System” is software that store and maintained all events coordinated in college. It also helpful to print related reports. My project will help to record the events coordinated by faculties with their Name, Event subject, date & details in an efficient & effective ways.
In my system we have to make a system by which a user can record all events coordinated by a particular faculty. In our proposed system some more featured are added which differs it from the existing system such as security.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
Vaccine management system project report documentation..pdfKamal Acharya
The Division of Vaccine and Immunization is facing increasing difficulty monitoring vaccines and other commodities distribution once they have been distributed from the national stores. With the introduction of new vaccines, more challenges have been anticipated with this additions posing serious threat to the already over strained vaccine supply chain system in Kenya.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
Courier management system project report.pdfKamal Acharya
It is now-a-days very important for the people to send or receive articles like imported furniture, electronic items, gifts, business goods and the like. People depend vastly on different transport systems which mostly use the manual way of receiving and delivering the articles. There is no way to track the articles till they are received and there is no way to let the customer know what happened in transit, once he booked some articles. In such a situation, we need a system which completely computerizes the cargo activities including time to time tracking of the articles sent. This need is fulfilled by Courier Management System software which is online software for the cargo management people that enables them to receive the goods from a source and send them to a required destination and track their status from time to time.
AKS UNIVERSITY Satna Final Year Project By OM Hardaha.pdf
Secondary steel making
1. Secondary Steel Making
Presented by :-
1. Abhishek Kumar (12MT10003)
2. Jagdip Singh (12MT10015)
IIT Kharagpur
(Metallurgical and Materials Engineering)
2. Secondary steelmaking is a critical step in the steel production process between the Primary processes
(Basic Oxygen Furnace or Electric Arc Furnace) and Continuous Casting.
3. Some elements are added and some have to be removed during secondary steelmaking in order to
fine-tune the composition of the steel to meet the specification and the customer’s requirements.
The temperature, internal quality and the inclusion content of the steel also have to be carefully
controlled during secondary steelmaking.
4. Stirring and Homogenization
Ladle stirring is an essential operation during secondary steelmaking in order to:
• Homogenize bath composition
• Homogenize bath temperature
• Facilitate the slag metal interaction essential for the process such as de-sulphurisation
• Accelerate the removal of inclusion in the steel
5. In practice, stirring is achieved by:
1. Argon Bubbling - through the liquid steel, either via a submerged lance, or by porous plugs in the bottom of the
ladle
2. Electromagnetic Stirring (EMS) - uses the electromagnetic induction principle to give efficient mixing of the entire molten
steel while maintaining an unbroken protective slag layer in the ladle.
6. Advantages-
• Simple
• good slag-metal contact, therefore good sulfur and phosphorus removal
• safe ladle lining
• lower capital and running costs than EMS
Disadvantages –
• turbulent surface
• nitrogen and hydrogen pickup
• alloy oxidation and loss
• reduced alloy cleanness
• stirring only at stir station
• slightly lower ferrostatic pressure effect than bottom plug injection
• significant basal 'dead zone' (dead-zones are the regions of the steel
bath where there is little or no circulation)
7. Advantages –
• minimized basal 'dead zone' (dead-zones are the regions of the steel bath
where there is little or no circulation)
• uniform dispersed stirring action
• maximized ferrostatic pressure effect
• strong off-center circulation
• excellent slag-metal contact, therefore good sulfur and phosphorus removal
• moderate nitrogen and hydrogen pickup
• cleaner steel
• ability to stir ladle continously anywhere
• lower capital and running costs than EMS
Disadvantages –
• heavy localized refractory wear
• more rigorous bricking regime
• danger of 'breakout'
8. Adavantages –
• minimal splash, meaning less exposure of steel to atmosphere and
reduced 'freeboard' required (i.e. the height of the ladle wall above
the bath surface)
• smooth uniform flow
• cleanest steel
• lowest nitrogen and hydrogen pickup
• reversible flow - useful when making alloy additions
• maximum safety and ease of bricking
• reduced refractory wear
• ability to stir ladle continously using EMS ladle car
• low alloy loss and oxidation
Disadvantages –
• high capital and running costs
• poor slag-metal contact, so lower sulfur and phosphorus removal than
argon bubbling
9. Homogenization of bath temperature and composition by argon bubbling is primarily caused by the dissipation of the
buoyant energy of the injected gas.
The following equations are used to calculate the stirring power and the mixing time (time to achieve 95%
homogenization)
Mixing Time Stirring Power
P0 = gas pressure at the bath surface, atm
H = depth of gas injection, atm
T = bath temperature, K
10. The ladle furnace is used to heat the steel . Argon bubbling is applied to homogenize the steel composition and
temperature.
Heating of up to 3°C per minute is achieved by a set of graphite electrodes, which are lowered into the slag layer, just
above the molten steel surface.
Another purpose of the ladle furnace is to act as a holding furnace between the BOF and the continuous casting
machine.
Ladle Furnace
11. LADLE FURNACE
Electrode –
Heating of up to 3°C per minute is achieved by a set of
graphite electrodes, which are lowered into the slag
layer, just above the molten steel surface.
Additional Chute -
It is used to add alloying elements and/or slag
components.
Water cooled roof –
Water cooled parts of the roof provide a quick and
efficient cooling.
Fume offtake -
Fumes formed during the operation in the LF are
extracted through the cover.
12. Degassing
The tank degasser is used to remove gaseous elements and sulfur from the steel.
The removal of sulfur is achieved through slag-metal reactions, which are
promoted by strong argon 'flushing' (bubbling) within the vacuum envelope.
Fe methods of degassing are as follow –
Ladle degassing
VD,VAD,VOD
Stream degassing
Circulation degassing
RH (Ruhrstahl Heraus)
DH
RH-OB
14. Recirculation Degasser (RH-OB Process)
The recirculation (RH) degasser is used for the removal of carbon and other impurity elements.
It comprises a pair of 'snorkels' which are lowered into the liquid steel. The pressure in the vessel is reduced to about 1-3 torr
(1 torr = 1 mmHg).
Argon is injected through tuyeres in one of the snorkels,
forcing the steel up into the unit and out again through
the other snorkel.
In some units, oxygen is injected through a lance in order
to assist decarburization.
16. Stream Degasser
In stream degassing, molten steel is poured into another vessel which is under vacuum. Sudden exposure of
molten stream in vacuum leads to very rapid degassing due to increased surface area created by breakup of
stream into droplets.
This process helps the hydrogen dissolved in steel, to be
evacuated by the vacuum pump.
The major amount of degassing occurs during the fall of molten
stream. Height of the pouring stream is an important
design parameter.
17. SN Unit Purpose
1 VAD Heating, Degassing
2 VD Degassing
3 VOD,
AOD
Chemical heating, decarburization
4 LF Heating, Homogenization,
desulphurization, deoxidation,
alloying
5 IM Deoxidation, de-sulphurization,
inclusion modification etc.
Ladle Degassing
Methods involved in this are as follow -
VOD process VAS Process
18. CAS-OB (Composition Adjustment by Sealed Argon Bubbling – Oxygen Bubbling)
The CAS-OB (Composition Adjustment by Sealed Argon Bubbling - Oxygen Blowing) allows alloy additions to be made
under an inert argon environment.
The unit is lowered onto the liquid steel over an 'eye' in the slag formed by argon bubbling.
In particular, it allows the simultaneous addition of Al and O2 gas
blown through a top lance. These react to form Al2O3 plus
considerable exothermic heat energy - the steel temperature can
be raised by up to 10°C per minute.
The CAS-OB is therefore used for CHEMICAL REHEATING. Note
however that the Al2O3 must subsequently be removed.
19. Deoxidation
Deoxidation is the process to eliminate oxygen, which may be free
dissolved in steel or may have reacted to form various oxides.
Aluminum is a very powerful deoxidizing agent and controls the
oxygen activity in the liquid steel [1] .
Using the equilibrium constant K to determine the composition of
the Al-O system at equilibrium, the Al-O equilibrium curves are
plotted. As can be seen in the graph below, deoxidation with
aluminum is more efficient at lower temperatures.
De-oxidation hierarchy: Ca > Al > Si > Mn
20. Larger particles floats up much faster than smaller particles
Gas agitation helps in inclusion removal
Liquid product of de-oxidation is helpful
Amount of Oxygen present can be determined with the help of Cellox Probe.
2
18
l s
t
gd
v
21. Decarburization
The removal of dissolved carbon from the steel during vacuum degassing arises from the following reaction:
[C] + [O]→CO (g)
Using the equilibrium constant K to determine the composition of the C-O system at equilibrium, the C-O
equilibrium curves are plotted.
For RH degassers the rate constant for the carburization is given by the relationship [1] while the time needed to
decarburize is given by relationship [2]:
22. Desulpurisation
Desulfurization in the ladle is achieved by:
Adding a synthetic CaO based desulfurizing slag at vessel tapping;
Aluminum deoxidizing the steel to very low oxygen activity (otherwise the Al will react preferentially with O);
Vigorously stirring the steel in the tank degasser in order to thoroughly mix the metal and slag.
The chemical reaction of the desulphurization process in the ladle is: - 3(CaO)+2[Al]+3[S] ---- 3(CaS)+(Al2O3)
23. Injection Metallurgy
It’s a technique evolved for adding reactive and volatile material.
Al2O3 helps in oxygen removal but it cause nozzle clogging, owing to its dendritic structure. As to
add Ca , we use injection metallurgy.
Mainly calcium, its alloy and compounds are added Ca-Si,CaO+Al2O3+CaF2, CaC2
Purpose:
Deep Deoxidation
Desulphurization
inclusion modification
24. 1. Fine inclusions which could not be eliminated are modified
2. Liquid product (C12A7, C3A) avoids nozzle clogging
3. Spherical deformable product (C12A7 with sulphide ring of Mn and Ca) improves
mechanical properties
Inclusion modification
26. The aim of powder Injection in ladle furnace is to reduce sulphur content in molten steel.
A desulphurizing agent in the form of a fine powder, is introduced in the steel bath that is stirred with argon. As
previously said, argon bubbles promote desulphurization, along with thermal and chemical homogenization of the bath.
Powder Injection
27. Need to desulpurise steel
Effective desulphurization allows to achieve high quality steel with ultra low concentrations of sulphur and
decrease sulphide inclusions, thus improving the steel toughness properties.
28. WIRE FEEDING
A number of ferroalloys, aluminum and calcium additions can be made in the form of cored-wires - i.e.
where the additive is encased in a steel sheath.
This addition technique was primarily developed for calcium additions, since the boiling point of Ca (1491°C)
is below the bath temperature.
Component of ladle furnace
29. Wire feeding is also useful for additions that:
• are less dense than molten steel and might otherwise float to the surface;
• have limited solubility;
• have a high vapour pressure;
• have a high affinity for oxygen;
• are very expensive and/or added in very small quantities;
• are toxic;
Aluminium is often added by wire feeding to improve recovery rate, control of Al content and improve steel cleanness.
30. 1. Speed of wire addition
There exists an optimum speed
2. Bath superheat
Higher the bath superheat lower is the melting time of the wire
3. Grade of steel
Cored wire penetrates more in high carbon heats
Factors affecting the core wire addition -