6 indicates that the steel wire rope is a 6-strand steel wire rope;37 indicates that there are 37 wires in each steel strand, which is a point contact structure.
Seamless Structure Pipe (GB/T8162-2008) is a seamless tube for general structure and mechanical structure. It is a kind of seamless steel pipe which is divided into different kinds because of its different uses. GB/T8162-2008 (seamless pipe for structure