ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
The Successive Hydrogen Concentration Control in Molten Steel by Direct Hydrogen Measuring System
Masatoshi OotsukaShinya YamamotoKeita NakagawaSyouhei KourokiKatsuyoshi IwataTsutomu Nagahata
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1996 Volume 36 Issue Suppl Pages S97-S100

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Abstract

Low hydrogen content in the steel is required to steels, such as special bar quality, crank-shaft, railway wheel, structural steel etc. By using the conventional hydrogen analyzer, quick response and necessary accuracy can not be obtained. Long time RH treatment was essential. Eventually, RH vessel life has been shorter. Therefore, "dynamic-dehydrogenation model" has been developed to attain both an optimum operation of RH-degasser and a security for dehydrogenation of hydrogen content after treatment. Followings are features of the dynamic dehydrogenation model:
1) Prompt adjustment of dehydrogenation by using direct hydrogen measurement system.
2) Correspondence to hydrogen pick-up from added alloys.
3) The KH depends on many factors, for example, RH conditions, chemical component and other characteristics. It is well known that Q depends on the RH operating conditions.
4) The KH clearly shows that maintenance of the snorkel diameter is important to keep the enough dehydrogenate rate. Also KH is decreased sharply in the low [H] region lower than 1 ppm.
With this model, treatment time was reduced by 6 min and the hydrogen content was controlled within the accuracy of ±0.2 ppm.

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© The Iron and Steel Institute of Japan
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