广大特材：公司主要供应高中压外缸、高中压内缸、中低压缸等铸件

Group 1 - The company, Guangda Special Materials, has provided insights into its gas turbine business, detailing the types of components it supplies, including high and medium pressure outer and inner casings, low and medium pressure cylinders, and various valves and fittings [2] - The company manufactures both cast and forged components for gas turbines, including items such as gas turbine casings, turbine cylinders, compressor cylinders, and various blade types [2]