Cangzhou Hongyuan tube industry: flat welding flange, flat welding with a diameter flange, the butt flange the Hongyuan pipe industry long-term products: flat welding flange, flat welding with a diameter flange. (Contact person: Feng, Hongmei Contact: 15,932,713,817 QQ: 1,763,757,819) Cangzhou Hongyuan Pipe Industry Co., Ltd. is a steel sales and pipe fittings as one large comprehensive enterprise. The company is located in the pipeline equipment industry in China to create a base - Hebei Yanshan. The east Bohai Huanghua Port, north of Beijing and Tianjin, the environment and convenient transportation. The company mainly engaged in the pipes of various materials: 304,304 L, 316,316 L, 321,310 S ,18-8, 16Mn, 20 #, 20G, 12Cr1MoVG, P91, 10CrMo910, 15CrMo 1 Quality: has passed ISO9001 international certification pressure vessel manufacturing license. 2 Finish: rust-proof black paint, anti-rust varnish, transparent anti-rust oil, hot-dip galvanizing, cold galvanizing, 3PE coating, epoxy coating. Projecting surface (RF), concave (FM), the convex surface (M), the tongue and the surface (T), the groove surface (G), the whole plane (FF). With neck flat welding flange diameter range: DN10 ~ DN600 Scope: PN Series PN2.5 ~~ PN40; Class Series Class150 ~ Class1500 flange material: carbon steel, Luo molybdenum steel 304,316,304 L, 316L, 321,347, CF8C. Manufacturing process: forging. Advantages: with neck flat welding flanges are welded flange, because there is a short-necked, thereby increasing the strength of the flange improved flange bearing efforts. It can be used in higher pressure pipelines. Disadvantages: higher cost, compared with the plate welded flange in transit due to the characteristics of its shape more easily bump