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Beneficial effect of B on hot ductility of 20CrMnTi steel with 0.05% Sn

Published online by Cambridge University Press:  04 July 2014

Hongbing Peng ,
Weiqing Chen ,
Lie Chen  and
Dong Guo
Hongbing Peng
Affiliation:
State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, P.R. China. e-mail: phbing1021@126.com
Weiqing Chen
Affiliation:
State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, P.R. China. e-mail: phbing1021@126.com
Lie Chen
Affiliation:
Xining Special Steel Co. Ltd., Xining 810005, P.R. China
Dong Guo
Affiliation:
Xining Special Steel Co. Ltd., Xining 810005, P.R. China

Abstract

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The beneficial effect of B on the hot ductility of 20CrMnTi steel with 0.05% Sn was investigated. The results show that there is a trough in the hot ductility-temperature curve. With the increase in the B content, the trough shifts to a lower temperature and becomes shallow, and the hot brittle range becomes narrow. In addition, B greatly enhancing the hot ductility was due mainly to its suppressing the Sn segregation, retarding the austenite/ferrite deformation, accelerating the onset of dynamic recrystallization (DRX) and promoting the intragranular nucleation of ferrite. Moreover, in the present case, adding 92 ppm B can nucleation of ferrite. Moreover, in the present case, adding 92 ppm B can obtain the best effect in improving the hot ductility of 20CrMnTi steel with 0.05% Sn.

Keywords

Borontinhot ductility20CrMnTi steel
Type
Short Communication
Information
Metallurgical Research & Technology , Volume 111 , Issue 4 , 2014 , pp. 221 - 227
Copyright
© EDP Sciences 2014

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