Bellows: The bellows company has obtained the B-class pressure pipe manufacturing license issued by the Quality and Technical Supervision Bureau of Liaoning Province, and can produce more than 5000 sets of bellows of various types annually. Products are widely used in petrochemical, steel mills, power plants, gas, heating pipe network, electric power and other industries, the company's products are sold all over the country and exported to South Africa, Japan, Brazil, Turkey, India and other countries. The nickel phosphorus coating anticorrosion technology studied by the company can effectively improve the chloride ion stress corrosion resistance of bellows expansion joint and bellows heat exchanger, especially suitable for corrosive gases such as gas, liquefied petroleum gas heat network engineering and other occasions. On the basis of digesting and absorbing the advanced technology of similar products from abroad, the Group and Metallurgical Coker Co., Ltd. jointly developed the patented products in 2003 to fill the domestic gap -- high temperature compensator and connecting elbow for dry quenching coke, which have been available in China 90% market share. The company supports the bellows for the national grid with millions of volts, and there are less than 3 domestic manufacturers of this bellows product.