China FAMOUS Steel Engineering Company Company News

At present, the most common anti-rust paints are epoxy and alkyd, and the service life is 1-2 years. If the adhesion of alkyd on the galvanized sheet and aluminum sheet is poor, it is generally required. The materials are steel and concrete, and the adhesion ability of these coated substrates epoxy antirust paint is better, and this super strong adhesion is innate. This article mainly popularizes the coating knowledge in this aspect.   The widely used anticorrosive and anticorrosive primer on steel equipment is an epoxy zinc-rich primer. The specific thickness of the coating is determined by the period of use of the anticorrosive coating, the surface treatment of the substrate, and corrosive factors. When directly coating the blasted steel structure and steel components, it is required to increase the roughness of the surface of the substrate by grinding, and the roughness conforms to the standard of 50 μm. When used as an anti-corrosive primer, the recommended dry film thickness of the manufacturer is 60μm. It is better to spray it once without air spray, while the brush is only used for small-area spraying. When air-spraying, it needs to be painted twice; When used as a shop primer, it generally provides 3-6 months of anti-rust function, and is usually used for temporary anti-corrosion coating of workpieces, but this does not affect the welding performance. For welding requirements, the dry film thickness is generally required to be 25μm. . According to actual engineering experience, long-term outdoor steel structure anti-corrosion and decoration engineering needs to increase the dry film thickness to 70-80μm.   Zinc-rich primer is a porous coating. When used in combination with intermediate paint, the coating interval is generally 16-24 hours. The coating process is: when applying the first pass, it needs to add about 50% thinner, fog. Spray it once and then spray it normally. It can effectively avoid the problems of various zinc-rich primer coating manufacturers such as foaming.

From June 26 to 27, the 2019 Second Steel Industry Intelligent Manufacturing Development Forum co-sponsored by China Iron and Steel Industry Association, China Steel Research and Technology Group Co., Ltd. and Hegang Group Co., Ltd. was held in Shijiazhuang City, Hebei Province. With the theme of "Internet, integration, and change", the forum aims to implement the major strategic deployments of the Party Central Committee, the State Council to build a network powerhouse, and digital China, promote the application of the industrial Internet in the steel industry, and enhance the intelligence and digitization of the steel industry. Green level. Yin Ruizhen, academician of the Chinese Academy of Engineering and deputy director of the former Ministry of Metallurgical Industry, and Sun Yu, academician of the Chinese Academy of Engineering, attended the opening ceremony of the forum and gave speeches entitled "The constitutive characteristics of the process-oriented manufacturing process" and "The development trend of the Internet of Things industry in China". The guests attending the opening ceremony were Lu Guixin, Inspector of the Raw Materials Department of the Ministry of Industry and Information Technology, Chi Jingdong, Vice President of the China Iron and Steel Industry Association, Gong Xiaofeng, Director of the Hebei Provincial Bureau of Industry and Information Technology, Peng Zhaofeng, General Manager of Hegang Group Co., Ltd., Wang Xindong, Deputy General Manager, and China Steel Research Institute. Zhang Jianwu, member of the Standing Committee of the Science and Technology Group Co., Ltd., and more than 300 people from the relevant leaders of information technology in various steel enterprises, related experts in upstream and downstream service enterprises in the industrial chain, cutting-edge technology companies and media representatives. The guests focused on the theme of the forum, "Internet, integration, and change", and jointly explored the focus and ways of the "smart +" of the steel industry under the new situation, and promoted the application of technologies such as Internet of Things, big data, 5G, and artificial intelligence in the steel industry. To promote the digital transformation of the steel industry. After the opening ceremony, experts from various ministries, research institutes, steel companies, IT companies, etc., focused on the application and practice of the industrial Internet in the steel industry, and the application and practice of emerging technologies in steel production scenarios. The special report of the field was highly praised by the participants.

On June 18, 2019, the symposium on the implementation of policies such as tax reduction and fee reduction in the steel industry was held in Beijing. Vice President Qu Xiuli chaired the meeting, and 15 key steel producers such as Taigang, Baowu and Angang participated in the discussion. The meeting exchanged the implementation of policies on reducing the value-added tax, reducing the fees charged by enterprises, easing the financing difficulties of enterprises, and clearing the amount of government defaults. The analysis of the difficulties and problems encountered in the implementation of the policy and the further implementation of the study. Opinions and suggestions on tax reduction and fee reduction.

At 8 o'clock on June 27, with the completion of the concrete pouring of the last party, the south main tower of the Hutong Yangtze River Bridge, which was constructed by the China Railway Corporation, the design of the China Railway Bridge and the construction of the China Railway Bridge Bureau, was successfully capped. So far, the two bridges are up to 330m. The main tower was completed.   The Hutong Yangtze River Rail-to-Use Railway Bridge has a total length of 11072m, a main bridge length of 2296m and a main span of 1092m. It is the largest spanned cable-stayed bridge in China and the world's first super-km-long cable-stayed bridge. The bridge is the control project of the entire line of Hutong Railway. It is also a “three-in-one” function of the national railway, intercity railway and expressway. It is designed as the upper layer for the Hutong Railway, Tongsujia Intercity Railway and Xitong Expressway. 6 lane highway, lower 4 lane railway. The steel used in the bridge project is about 480,000 tons, which is equivalent to the steel used in 12 "Bird's Nest"; the concrete is 2.3 million m3, which is equivalent to the use of 8 national grand theatres. The bridge is made of new materials such as Q500qE high-strength steel and 2000Mpa parallel steel wire stay cables. Its large scale of engineering, high construction difficulty, and a large number of scientific and technological innovations have created the world's bridges and many of China's bridge construction, representing the highest level of bridge construction in China and the world at present.

At 8 o'clock on June 27, with the completion of the concrete pouring of the last party, the south main tower of the Hutong Yangtze River Bridge, which was constructed by the China Railway Corporation, the design of the China Railway Bridge and the construction of the China Railway Bridge Bureau, was successfully capped. So far, the two bridges are up to 330m. The main tower was completed.   The Hutong Yangtze River Rail-to-Use Railway Bridge has a total length of 11072m, a main bridge length of 2296m and a main span of 1092m. It is the largest spanned cable-stayed bridge in China and the world's first super-km-long cable-stayed bridge. The bridge is the control project of the entire line of Hutong Railway. It is also a “three-in-one” function of the national railway, intercity railway and expressway. It is designed as the upper layer for the Hutong Railway, Tongsujia Intercity Railway and Xitong Expressway. 6 lane highway, lower 4 lane railway. The steel used in the bridge project is about 480,000 tons, which is equivalent to the steel used in 12 "Bird's Nest"; the concrete is 2.3 million m3, which is equivalent to the use of 8 national grand theatres. The bridge is made of new materials such as Q500qE high-strength steel and 2000Mpa parallel steel wire stay cables. Its large scale of engineering, high construction difficulty, and a large number of scientific and technological innovations have created the world's bridges and many of China's bridge construction, representing the highest level of bridge construction in China and the world at present.

According to the statistics of the National Bureau of Statistics, from January to May 2019, China's crude steel output was 404.88 million tons, an increase of 10.2% year-on-year. In the same period, steel output was 480.36 million tons, an increase of 11.2% year-on-year. The double-digit growth in crude steel and steel production has made the search for “steel demand” a problem that the steel industry has to face.   At the same time, the steel structure shows great potential for development. “In 2018, the output of steel structure was 0.6874 billion tons, the output of steel structure accounted for 7.4% of steel output, and the output increased by 11.84%; the output of overseas exported steel structure reached 1.117 million tons.” Recently, Deputy Secretary-General of China Construction Metal Structure Association The Construction Steel Structure Branch President’s Party Defence announced the development data of the construction steel structure industry last year to the whole industry at the National Steel Structure Construction Industry Conference.   The same double-digit increase indicates that the steel structure building is becoming a new force for “steel demand”.

On June 18th, the Apengjiang Bridge, the first high-span railway bridge in China, was successfully completed. The first high span means that the pier is 123.5 meters high and the main span is 240 meters. The long span of such a high pier is rare for domestic railways. The successful completion of the Apengjiang Bridge marked the completion of the work in front of the Zhangjiajie Changde Railway Station and won time for the entire line of timelines.

The modern economy is constantly improving and the construction of cities is not falling behind. With the booming of high-rise buildings and the height of building heights, more and more people are paying attention to steel structures because steel structures have high strength, light weight, good seismic performance, short construction period, low base cost and structural occupation. Many advantages such as small area and high degree of industrialization. However, compared with the concrete structure, a significant weakness of the steel structure is that it is easy to conduct heat. When the surface temperature of the steel reaches 400 °C, the strength and elastic modulus will decrease significantly. When the temperature reaches 600 °C, the strength of the steel for steel structure is almost Zero. The fire resistance of bare steel is usually only 15 to 30 minutes. According to the requirements of China's building fire protection design code, the main load-bearing components of the building, such as the fire resistance limit of columns, beams, walls and floors, are 0.5 to 3.0 hours respectively. Our country has clearly stated that it is necessary to adopt fire prevention measures on the steel structure, and it is necessary to meet the corresponding national standards before passing the acceptance.   The fire protection treatment methods of steel structures are various. In the past, solid concrete outer cladding layers by cast-in-place molding, fire barriers such as refractory bricks, gypsum board coating or internal cooling of hollow pipes were used. Now more is to protect the steel structure by spraying fireproof coating, anticorrosive coating and fluorocarbon paint. Because of the good fireproof and heat insulation performance of this measure, the construction is not restricted by the structural geometry, generally no need to add auxiliary facilities, and the coating quality is light, and there is a certain aesthetic decorative effect, so it has been widely used.   In addition, there are steel structure stairs, steel structure steel frame, light steel structure, steel structure stadium, steel structure shed, steel structure canopy, steel structure canopy, steel structure canopy, steel structure advertising facility, steel structure automobile exhibition hall, steel Structural light boxes, power plant steel structures, airport steel structures, etc.

A few days ago, the new transportation bridge project of Hangzhou Asian Games, the new bridge of Qiantang River, was officially started. It is expected to be completed before the opening of the Asian Games in 2022. As a key project of the Hangzhou section of the Shanghai-Hangzhou-Ningbo Expressway, the completion of the bridge is of great significance to promote the development of Zhejiang Dawan District, Metropolitan Area and Hangzhou City.   The new Qiantang River Bridge is located on the downstream side of the Pengyu Bridge. It has a total length of 1350.8 meters and is divided into two upper and lower floors. The upper level is the elevated expressway and the lower level is the double-line fast track. The airport track express line crosses the Qiantang River from here. After the completion of the bridge, it will further support the development strategy of Hangzhou's eastward expansion and support the river, and improve the internal traffic of the city; connecting Xiaoshan Airport, Qianjiang Century City, Qianjiang New City and East Station Hub will become an important commuter passage for Hangzhou citizens.   It is understood that the Hangzhou section of the Shanghai-Hangzhou-Ningbo Expressway has a total length of 23.6 kilometers. In addition to the main toll station, the entire line is in the form of a viaduct. The viaduct adopts the first-class highway construction standard, and the design speed is 80 km to 100 km. The ground road adopts the first-class highway construction standard and takes into consideration the urban road function, and the design speed is 60 km.

Last week, the Hangzhou Bay Cross-sea Railway Bridge (the Shanghai-Jialong Railway Hangzhou Bay Bridge) laid the first hole and the marine survey work was fully launched. On the same day, the No. 1 hole completed the installation and positioning of the equipment platform and began the drilling work.   In 2008, the Hangzhou Bay Bridge was completed and opened to traffic. The distance between Ningbo and Shanghai was shortened to more than 120 kilometers. However, this bridge is a highway bridge. It takes more than two hours to travel from Ningbo to Shanghai. However, when the Hangzhou Bay Cross-sea Railway Bridge, which has recently laid the first hole, will be built on the bridge, the high-speed rail will be built on the bridge. Therefore, the “1 hour traffic circle” between “Shanghai-Ningbo” will no longer be a dream.   It is reported that the Hangzhou Bay Cross-sea Railway Bridge with a total length of about 26 kilometers has been included in the overall scheme of the Tongsu Jiayu high-speed railway, and has become an integral part of the coastal railway passenger transport corridor in the main skeleton of the national high-speed railway network. According to the pre-feasibility review meeting of the Tongsu Jiayu Railway held in Beijing at the end of April this year, the north and south ends of the Hangzhou Bay Cross-sea Railway Bridge are Jiaxing Haiyan and Ningbo Cixi. Therefore, in the future, people can take the 350-kilometer high-speed train from Shanghai via Jiaxing to Ningbo, no longer detour to Hangzhou and Shaoxing.