In May 27, 2009, American Spring Wire Corp, Insteel metal and Sumiden metal products company to USA Ministry of Commerce and American International Trade Commission to submit the application, that China exports to the prestressed concrete structure with steel strand American at less than normal value of the sale price, and China government involved products of export subsidies, therefore caused substantial damage or threat substantial damage to the domestic industry by American, substantive impediment to the establishment of American domestic industry, so the request American Ministry of Commerce and International Trade Commission to American strand investigation of anti-dumping and subsidies for prestressed concrete structure self China import, product customs code for 73121030