Universities in China produce high quality steel alloy hard rock TBM cutter ring. Tsinghua University, Yantai University and China Railway Engineering Equipment Group Co., Ltd together project "Super-hard rock wear-resistant hob cutter ring technology research and development". Acceptance test It is success on October 31. Write jiaodong.net.

Many companies in China produce Tunnel Boring Machine. They export to many countries. But disc cutter rings came from Germany from company WIRTH.

Jiaodong.net write "School of Materials of Tsinghua University use better chemical composition for cutter ring material, use digital steelmaking technology. Smelt [O]≤9ppm, [N]≤64ppm, [H ] ≤0.8ppm of high-quality alloy steel ingots with very very low gas content. Use multi-directional die forge and vacuum heat treatment. Result perfect cutter ring."

China Railway Engineering Equipment Group Co., Ltd. say detail mechanical performance data for China cutter ring better than WIRTH cutter ring.

http://www.jiaodong.net/news/system/2020/11/06/014109695.shtml