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Abstract
A non-uniform temperature across the width of martensitic stainless-steel strips is considered to be one of the main reasons why the strip exhibits un-flatness defects during the hardening process. Therefore, the effect of the gas inlet position in this process, on the temperature distribution of the steel strip was investigated numerically. Furthermore, an infrared thermal imaging camera was used to compare the model predictions and the actual process data. The results showed that the temperature difference across the width of the strip decreased by 9% and 14% relative to the calculated temperature and measured values, respectively, when the gas inlet position was changed. This temperature investigation was performed at a position about 63 mm from the bath interface. Moreover, a more symmetrical temperature distribution was observed across the width of the strip. In addition, this study showed that by increasing the amount of the hydrogen flow rate by 2 Nm3/h, a 20% reduction of temperature difference across the width of strip was predicted. Meanwhile, the results show that the effect of the strip velocity on the strip temperature is very small.
Highlights
A more symmetrical temperature distribution was observed across the width of the strip
The results show that the effect of the strip velocity on the strip temperature is very small
A continuous martempering process, or a hardening and tempering line is employed for the production of thin strips of martensitic stainless steels
Summary
A continuous martempering process, or a hardening and tempering line is employed for the production of thin strips of martensitic stainless steels. Thereafter, a martempering quenching media where the strip is stabilized just above the temperature where the initialization of a martensitic transformation occurs. Webster et al [1] mentioned a hot oil (up to 205 ◦ C) and a molten salt (160 to 400 ◦ C) as a common martempering quenching media for conventional component hardening. This hardening process needs to be carried out so that consistent flatness is maintained in the finished products.
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