Accurate controlling of the hardness and Ta, W, Nb chemical composition on Tubes and Pipes

Posted by Super User

Tantalum and Niobium are heat-tolerant refratory metals with excellent corrosion resistance. The tubes and pipes made by Ta and Nb can be used in following areas.   

1. Pipeline to deliver liquid, solid granule and so on.

2. Heat exchanger, such as boiler tube, tube for chemical engineering.     

3. Pipe for petroleum geology.     

4. Mechanical tube.

5. Cable tube, tube for high pressure vessel.     

6. Tantalum Rings.    

7. Medical Tubes     

8. And so on


Changsha South Tantalum Niobium Co., Ltd is good at producing Seamless Tubes and Pipes with Outer Diameter 1.5~150mm, Wall Thickness 0.2~10mm, Length 5~12000mm. The deviations of Wall Thickness is within +/-10%, or even better at +/-5%. All tubes and pipes 100% meet with the requirement of ASTM B521 with certificate EN10204/3.1. Moreover, our Seamless Tubes and Pipes production line is flexible in manufacturing different size, from capilary tubes to large-diameter pipe regardless of small or large quantity with uniform property on each part.  


Equiped with full set of testing instrument, Changsha South Tantalum Niobium Company Co. Ltd is able to conduct the inspection and testing by himself as per ASTM Standard and GB/T Chinese Standard. For tubes and pipes, we have Ultrasonic Successive Thickness Measuring System to measure wall thickness, Eddy Current Flaw Dector to detect the defects and cracks in the inner of products like tubes and pipes, and Hydrostatic Test Equipment to detect the defects and cracks in the inner of tubes and pipes. To a certain of customers who have special requirement on Ta, W, Nb chemical composition, we have element detector to analyze the weight of each chemical composition, especially for Ta, Nb and W(Tungsten). Which is helpful for us to control the percentage of each chemical element from the raw material to the finished products, so that eligible products are delivered to our customer with good satisfaction. It is well known that the Tantalum weight on Niobium is very hard to control, with this detector, we can improve our configuration, ingot melting and so on to have suitable Ta weight. Hardness is a comprehensive index of mechanical properties such as elasticity, plasticity, strength and toughness of materials. To better control of the hardness of the tubes and pipes, we use Vicker Hardometer during our production and testing. Our great capability of controlling hardness and chemical composition have won more and more customers' orders for Tubes and Pipes.

In future, Tantalum and Niobium Metals will be used in more and more areas because of the property of premium heat-tolerance, excellent corrosion-resistance and easy processing. especially for Chemical Industry, Ta and Nb is more environmental friendly.

CFSP Auditing of 2017

Posted by Super User

  Changsha South Tantalum Niobium CO .,LTD (CSTN for short) was informed by the Conflict-Free Smeltery Programme (CFSP) Audit committee (ARC) that CSTNs tantalum supply chain is compliance with CFSP Tantalum Protocol, which means CSTN has successfully passed 2016 annual audit for the Conflict -Free Smeltery Program, marking that CSTNs CFSP certification continues to be effective as a Global Qualified Smeltery and Supplier for Non-conflict Tantalum Materials, thereby further strengthening CSTN's position in the world tantalum industry.

  On-site auditing last time cover legality and traceability for all tantalum minerals and materials sourced from November 1st, 2015 to October30th, 2016 including CSTNs procurement policy, supplier management for tantalum raw materials, annual due diligence report, relevant document and records for traceability of tantalum raw materials etc.this year covers legality and traceability for all tantalum minerals and materials sourced from November 1st, 2016 to October 30th, 2017

Through on-site audit, the audit experts team gave high appreciation of CSTNs normal operation and perfect management of supply chain control system. 

CSTN successfully passed the 2016 CFSP annual audit which is helpful to further improving CSTNs internal control system and heightening its market competitiveness in the global tantalum industry. We believe Changsha South Tantalum Niobium CO., LTD will get approved by audit team.