5 fortune 500 companies sent orders at the same time, “South Tantalum Niobium” exports turned over several times. Technical staffs in “South Tantalum Niobium” made the dimensional tolerances of tantalum tubes has doubled than the US ASTM standards, through their unremitting efforts, after numerous experiments and technology research, and they finally solved a world-class problem of eccentric tantalum tube.

Rare metal (such as tantalum, niobium) materials technology is one of the most popular subject of materials science and engineering of materials in the new century ,The development of high and new technology and it is the key material of he development of high and new technology .