Hunan Tianyan Machinery Co., Ltd. is affiliated to China Ordnance Equipment Group Co., Ltd. and is a holding subsidiary of its China Changan Automobile Group Co., Ltd., focusing on engine parts such as turbochargers, high-performance valves, cooling fans, and high-speed rail EMU cooling. R&D, production and sales of fans.

The company is located in Hejiangtao, Shigu District, Hengyang City, Hunan Province. It has convenient transportation and obvious location advantages. It covers a total area of ​​more than 600,000 square meters and has a total assets of more than 1 billion yuan. It has a nationally recognized enterprise technology center, a postdoctoral research workstation and a Hunan Automotive Turbocharger Engineering Technology Center.

The company was founded in 1950 and was called Hengyang Dali Industrial and Mining Pharmaceutical Factory. In 1966, it was renamed Xiangyang Machinery Factory. In 1991, the third line was moved, and the former Hongyuan Machinery Factory (Huaihua Xupu County) and Hongling Machinery Factory (Huaihua Chenxi County) were moved to Hengyang and merged with Xiangyang Machinery Factory to form Hunan Jiangyan Machinery Factory. In 2003, it was reorganized and reorganized, and Hunan Tianyan Machinery Co., Ltd. was established. It acquired a backdoor in 2012, completed industrial and commercial changes in 2014, and established Hunan Tianyan Machinery Co., Ltd., and resumed trading in May of the same year. The stock name is Hunan Tianyan, with A-share code 600698.

The company's products cover the engine power range of 30KW-2000KW and the displacement is 0.8L-30L. Widely used in engineering machinery, automotive machinery, agricultural machinery, marine machinery and high-speed rail EMUs, etc., it has established stable domestic well-known enterprises such as Changan Automobile, Dong'an Power, Weichai, Xichai, Yuchai, Dachai, Quanchai and other well-known domestic enterprises. Supporting and strategic cooperation, products are sold to Europe, America, Southeast Asia and other countries and regions.