the Challenge group, was recognized as the top 5 steel coils supplier in Shanghai, China, monthly over 150,000 tons steel product in stock, authorized as the delegation by most of the top class steel mills in China, including ANSTEEL, WISCO, MASTEEL, SHOUGANG, reach a turnover of more than $800 million us dollars. Along with years reliable partner relationship to worldwide customers, Tyssenkrupp for instance.