Form and Distribution of Inclusions and Tin in Free-cutting Steel

LI Liansheng; ZHU Rong; SUN Yanhui; GUO Hanjie; YIN Hao; DONG Jie

doi:10.13374/j.issn1001-053x.2004.05.005

Volume 26 Issue 5

Aug. 2021

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LI Liansheng, ZHU Rong, SUN Yanhui, GUO Hanjie, YIN Hao, DONG Jie. Form and Distribution of Inclusions and Tin in Free-cutting Steel[J]. Chinese Journal of Engineering, 2004, 26(5): 471-473. doi: 10.13374/j.issn1001-053x.2004.05.005

Citation:

LI Liansheng, ZHU Rong, SUN Yanhui, GUO Hanjie, YIN Hao, DONG Jie. Form and Distribution of Inclusions and Tin in Free-cutting Steel[J]. Chinese Journal of Engineering, 2004, 26(5): 471-473. doi: 10.13374/j.issn1001-053x.2004.05.005

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Form and Distribution of Inclusions and Tin in Free-cutting Steel

doi: 10.13374/j.issn1001-053x.2004.05.005

1. Metallurgical and Ecological Engineering School, University of Science and Technology Beijing, Beijing 100083, China;
2. Technological Centre, Laiwu Steel Co. Ltd, Laiwu 271104, China

Received Date: 2004-01-14
Available Online: 2021-08-17

Abstract

Abstract

A free cutting steel containing tin less than 0.05% in mass fraction was developed, which possessed good machinability and satisfactory mechanical properties meeting the national standard of China. The forms and distribution of inclusions and tin in the steel were investigated by observations of the steel samples and the fracture of the mechanical testing samples by means of SEM and EDS. The results showed that the complex inclusions, nodular or spindle-shaped, were composed mainly of oxides and manganese sulphide. It was found that there were marked segregation of tin in the fracture and on the surfaces of inclusions in the steel.
- free cutting steel,
- tin,
- inclusions