Metall. Res. Technol.
Volume 113, Number 6, 2016
|Number of page(s)||7|
|Published online||30 August 2016|
Technological intervention for continuously cast billet of martensitic stainless ultra high strength steel
1 School of Metallurgical and Materials
Engineering, Chongqing University of Science and Technology,
2 State Key Laboratory of Rolling Technology and Automation, Northeastern University, Shenyang 110004, P.R. China
Accepted: 26 July 2016
Substantial market exists for martensitic stainless Ultra High Strength Steel (UHSS) with 12–13 wt% Cr due to its high hardness and strength, moderate temperature tolerance and corrosion resistance. However, columnar crystals, center porosity, shrinkage cavity and surface quality of martensitic stainless UHSS depend on special continuous casting (CC) technology parameters. In order to control the quality of billets, an industrial plant trial for optimizing the process parameters in a square bloom continuous casting was performed, in which influences of caster parameters (such as casting speed, temperature, electromagnetic stirring (EMS), mold flux, secondary cooling) on the surface quality and solidification macrostructure of martensitic stainless UHSS were investigated. The results indicated that an excellent surface quality and a good billet solidification structure of martensitic stainless steel could be obtained with appropriate measures, in which all of subsurface crack and depression have disappeared, and the equiaxial crystals in the center of the martensitic stainless UHSS billet was up to 50%, even to the maximum of 57%, the central porosity was below level 1.5 and more than 90% of the central shrinkage cavities have reached to level 1.0.
Key words: Ultra high strength steel / equiaxed grain / center porosity / electromagnetic stirring / continuous casting
© EDP Sciences 2016
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