Publication detail

Design of cooling units for heat treatment

POHANKA, M. KOTRBÁČEK, P.

Original Title

Design of cooling units for heat treatment

English Title

Design of cooling units for heat treatment

Type

book chapter

Language

en

Original Abstract

Microstructure and nature of grains, grain size and composition determine the overall mechanical behavior of steel. Heat treatment provides an efficient way to manipulate the properties of steel by controlling the cooling rate. Way of heat treatment depends on many aspects. One of the most important parameter is the amount of production. Another important parameter is size of products. We focus here on large production such as interstand and run-out table cooling of hot rolled strip, run-out table cooling of sheets and plates, cooling of long products at the exit from a rolling mill, cooling of rails, tubes and special profiles, continuous hardening and heat treatment lines for steel strips. In-line heat treatment is characterized by running of hot material through the cooling section. Design procedure of cooling sections for obtaining the demanded structure and mechanical properties is iterative research involving several important steps. We begin with Continuous Cooling Transformation (CCT) diagram for the selected material. Numerical simulation of cooling follows to find appropriate cooling intensity and its duration. Knowing the desired cooling intensity new cooling section is designed and tested under the laboratory conditions. From the laboratory experiments boundary conditions are obtained and tested using numerical model. When the best solution is found it is tested on the real sample and the result structure is studied. In most cases the process must be repeated as the CCT diagram is for different size of sample and the cooling rate in designed section is not constant.

English abstract

Microstructure and nature of grains, grain size and composition determine the overall mechanical behavior of steel. Heat treatment provides an efficient way to manipulate the properties of steel by controlling the cooling rate. Way of heat treatment depends on many aspects. One of the most important parameter is the amount of production. Another important parameter is size of products. We focus here on large production such as interstand and run-out table cooling of hot rolled strip, run-out table cooling of sheets and plates, cooling of long products at the exit from a rolling mill, cooling of rails, tubes and special profiles, continuous hardening and heat treatment lines for steel strips. In-line heat treatment is characterized by running of hot material through the cooling section. Design procedure of cooling sections for obtaining the demanded structure and mechanical properties is iterative research involving several important steps. We begin with Continuous Cooling Transformation (CCT) diagram for the selected material. Numerical simulation of cooling follows to find appropriate cooling intensity and its duration. Knowing the desired cooling intensity new cooling section is designed and tested under the laboratory conditions. From the laboratory experiments boundary conditions are obtained and tested using numerical model. When the best solution is found it is tested on the real sample and the result structure is studied. In most cases the process must be repeated as the CCT diagram is for different size of sample and the cooling rate in designed section is not constant.

Keywords

HTC, cooling, temperature, thermocouple, Leidenfrost, heat treatment, experiment, steel, nozzle, boundary conditions, simulation, inverse method, model, rail, tubes, structure, properties, perlite

RIV year

2012

Released

26.09.2012

Publisher

InTech

Location

Rijeka, Croatia

ISBN

978-953-51-0768-2

Book

Heat treatment conventional and applications

Edition

In Tech

Edition number

1

Pages from

1

Pages to

20

Pages count

20

URL

BibTex


@inbook{BUT95193,
  author="Michal {Pohanka} and Petr {Kotrbáček}",
  title="Design of cooling units for heat treatment",
  annote="Microstructure and nature of grains, grain size and composition determine the overall mechanical behavior of steel. Heat treatment provides an efficient way to manipulate the properties of steel by controlling the cooling rate. Way of heat treatment depends on many aspects. One of the most important parameter is the amount of production. Another important parameter is size of products. We focus here on large production such as interstand and run-out table cooling of hot rolled strip, run-out table cooling of sheets and plates, cooling of long products at the exit from a rolling mill, cooling of rails, tubes and special profiles, continuous hardening and heat treatment lines for steel strips. In-line heat treatment is characterized by running of hot material through the cooling section. 
Design procedure of cooling sections for obtaining the demanded structure and mechanical properties is iterative research involving several important steps. We begin with Continuous Cooling Transformation (CCT) diagram for the selected material. Numerical simulation of cooling follows to find appropriate cooling intensity and its duration. Knowing the desired cooling intensity new cooling section is designed and tested under the laboratory conditions. From the laboratory experiments boundary conditions are obtained and tested using numerical model. When the best solution is found it is tested on the real sample and the result structure is studied. In most cases the process must be repeated as the CCT diagram is for different size of sample and the cooling rate in designed section is not constant.",
  address="InTech",
  booktitle="Heat treatment conventional and applications",
  chapter="95193",
  edition="In Tech",
  howpublished="electronic, physical medium",
  institution="InTech",
  year="2012",
  month="september",
  pages="1--20",
  publisher="InTech",
  type="book chapter"
}