... .:500mm Tangshan Ruiyin Trade Co.,Ltd was founded in 1995,registered capital to be $ 80 million. ... Tangshan is the most concentrated areas about iron and steel enterprises in China. It is not only have ... on the advantages of Tangshan local resources . Complete in specifications , high quality and lower price, section ... than 500,000tons, 8,000,000 tons of iron ore sales, total amount 5 billion us dollars, ...