618-0813/02 – Cleanness and Usable Properties of Steel (ČaUVO)
| Gurantor department | Department of Metallurgy and Foundry | Credits | 5 |
| Subject guarantor | prof. Ing. Karel Michalek, CSc. | Subject version guarantor | prof. Ing. Karel Michalek, CSc. |
| Study level | undergraduate or graduate | Requirement | Compulsory |
| Year | 2 | Semester | summer |
| | Study language | Czech |
| Year of introduction | 2004/2005 | Year of cancellation | 2010/2011 |
| Intended for the faculties | FMT | Intended for study types | Follow-up Master |
Subject aims expressed by acquired skills and competences
- student will be able to characterise basic terms from field of chemical and metallographical steel cleanness
- student will be able to formulate basic physical chemical processes at formation of non-metal inclusions in steel including their activity on steel properties
- student will be able to describe possibilities of contemporary metallurgy for steelmaking with high requirements on steel chemical and metallographical cleanness
- student gains experience in the preparation of steel samples for microscopic analysis, self-microscopic analysis of defects in steel area of confrontation with the standards and the results of numerical modelling
- student will learn to process and interpret the results of numerical modelling of filling and solidification of steel in the QuikCAST postprocessor software.
Teaching methods
Lectures
Seminars
Individual consultations
Tutorials
Experimental work in labs
Project work
Summary
The subject is focused on improvement and advancement of knowledge about
chemical and metallographic cleanliness of steel. It deals with possibilities
of cleanliness classification, technological method of its achievement and
exact methods of its evaluation. The intention is to demonstrate wider
relation between technology of steel production, cleanliness of steel and
usable properties of steel.
Compulsory literature:
Recommended literature:
Way of continuous check of knowledge in the course of semester
Two scored semester works.
Two scored progress tests.
E-learning
Only study support in Czech language is available now: http://www.fmmi.vsb.cz/cs/okruhy/studium-a-vyuka/podklady-ke-studiu
For electronic communication with the teachers enjoy the university e-mail addresses those can be found here: http://staff.vsb.cz/
Integration of e-learning elements into the subject is in progress.
Other requirements
There are not additional requirements on students in the field of this subject.
Prerequisities
Subject has no prerequisities.
Co-requisities
Subject has no co-requisities.
Subject syllabus:
Course content
1. The importance of steel production in the global and national scale. Characteristics of chemical cleanliness. Effect of P, S, N, H and O on the properties of steel. The main principles of metallurgical steel production with low content of those elements.
2. Non-ferrous metals in the steel. Sources of non-ferrous metals in steel production. Ways to reduce the non-ferrous metals in the steel crap. Effect of non-ferrous metals in the steel. Positive and negative effects of non-ferrous metals on the properties of steel.
3. Effect of non-ferrous metals on the properties of steels for the manufacture of equipment for power engineering. Limits of the contents of non-ferrous metals in the steel. J, B and K factors of steel cleanliness.
4. The metallography cleanliness of steel. Distribution of nonmetallic inclusions - endogenous and exogenous inclusions.Sources and origin of the exogenous non-metallic inclusions. Thermodynamics of oxide inclusions.
5. Thermodynamics of sulfides, nitrides and carbides. Effect of deoxidation of steel on the non-metallic inclusions systems.The secondary oxidation of steel.
6. The influence of nonmetallic inclusions on steel properties. Effect on mechanical properties. Influence of inclusions under cyclic loading. Identification of non-metallic inclusions. Optical microscopy, image analysis, electron probe microanalysis of inclusions, chemical methods of inclusions identification.
7. Summary of metallurgical production processes allowing high steel petrographical cleanliness. Application possibilities for the removal of secondary metallurgy tracing elements. Modification of inclusions. Injection metallurgy. Vacuum metallurgy.
8. Specific requirements for steel production technology with high carbon - cord steel.Requirements for the raw materials, the method of secondary processing. Technology of steel casting and crystallization. Subsequent processing methods of semi finished products and the use of finished products.
9. Stainless steel. Corrosion resistance. Types of corrosion.Influence of chemical composition. Types of stainless steel. Effect of inclusions on corrosion resistance of steel, steel machinability, weldability of steel. Peculiarities of morphology and chemical composition of inclusions in stainless steel - impact on the properties of steel.
10. Low carbon steel. ULC steel, the IF steel. Transformer steel. Vacuum decarburization. Principles. Examples of technologies. Rotating vacuum with stirring oxygen. KTB process.
Conditions for subject completion
Occurrence in study plans
Occurrence in special blocks
Assessment of instruction