Du Shuanghua. According to official website of Rizhao Steel Holding Group Co., Ltd., as of July 28th, 223, the general agent of Rizhao Steel in Shandong was Du Shuanghua. Rizhao Iron and Steel Holding Group Co., Ltd. (hereinafter referred to as Rizhao Iron and Steel) is a large-scale iron and steel enterprise integrating sintering, ironmaking, steelmaking, rolling, pickling, coating, pipe-making, power generation, oxygen generation and cement. It was established in 23 and is located in Binhai Road, Lanshan District, Rizhao City, Shandong Province. Its main products include plates (hot rolled coils, cold-formed coils, Kaiping and longitudinal cut-to-length plates, pickling plates, plating.