Detail publikace

OVERCOOLING IN OVERLAPPING AREAS DURING HYDRAULIC DESCALING

POHANKA, M. VOTAVOVÁ, H.

Originální název

OVERCOOLING IN OVERLAPPING AREAS DURING HYDRAULIC DESCALING

Typ

článek ve sborníku ve WoS nebo Scopus

Jazyk

angličtina

Originální abstrakt

The production and processing of high quality grades of steel is connected with oxidation at high temperatures. Unwanted scales are formed on the steel surface, which is usually heated over 900°C. These scales are often removed by hydraulic descaling during production. In most cases where long, flat products are produced, one row of descaling nozzles is used. Because these flat jet nozzles are arranged in the row, the water spray from one nozzle interferes with the spray from neighboring nozzles. This zone is called an overlap area and oftentimes more scales remain here after the descaling process. An increased amount of scales left behind result in a lower quality final product. The typical configuration with an inclination and twist angle equal to 15° was studied. Heat transfer coefficients (HTC) and surface temperatures were measured in the overlap area and compared with values obtained from undisturbed areas. It was found that the overlap area is grossly overcooled. Results were compared with a new configuration, where the twist angle was changed to 0°, and it was found that the overcooling was significantly reduced. Temperature measurement showed that the increased thickness of the scales in the overlap area can also be caused by surface overcooling because the scales change material properties with temperatures, and are therefore more difficult to remove. The new configuration with a twist angle of 0° seems to promise to improve the quality of hydraulic descaling.

Klíčová slova

scales, steel, water, hydraulic, descaling, overlapping, temperature, heat transfer coefficient, surface

Autoři

POHANKA, M.; VOTAVOVÁ, H.

Rok RIV

2015

Vydáno

28. 9. 2015

Nakladatel

Inštitut za kovinske materiale in tehnologije, Ljubljana, Lepi pot 11,

Místo

Ljubljana

ISBN

978-961-92518-8-1

Kniha

Book of abstracts

Edice

23rd International Conference on Materials and Technology

Číslo edice

23

Strany od

199

Strany do

199

Strany počet

1

BibTex

@inproceedings{BUT117646,
  author="Michal {Pohanka} and Helena {Votavová}",
  title="OVERCOOLING IN OVERLAPPING AREAS DURING HYDRAULIC DESCALING",
  booktitle="Book of abstracts",
  year="2015",
  series="23rd International Conference on Materials and Technology",
  number="23",
  pages="199--199",
  publisher="Inštitut za kovinske materiale in tehnologije, Ljubljana, Lepi pot 11,",
  address="Ljubljana",
  isbn="978-961-92518-8-1"
}