On November 30, the annual conference of China welded steel pipe academic conference was solemnly held in Jinan. Participating in the domestic and international welded steel pipe around 80 companies, the meeting was held in the 19th strong boost inspired by Dongfeng, to discuss the development trend of welded steel pipe industry. The 19th Congress undoubtedly brought China's political economy to a new stage. It not only paid a lot of attention to China but also to the rest of the world. When China became the world's second-largest economy, its political and economic changes also affected the global market. With the definition of major contradictions in Chinese society, it means that the economic problems in the future will be the core of high-level concern.

After the 19th National Congress, the government will implement the following measures: 1. Promote high-quality economic development; 2. Strive to capture the three key development points of development mode, economic structure and growth momentum; 3. Accelerate the construction of a modern economic system with emphasis on quality first and efficiency first. On behalf of the meeting coincided with the domestic steel industry rebound, the enthusiasm and expectations of the participants is self-evident.

Two keynote speeches were made at the conference. Professor Wang Xiao Xiang, former chairman of China Petroleum Bohai Steel Pipe Design and Research Institute, made a review and forecast on the operation and technological progress of China's welded pipe industry since 2016.

The main point is: After many years of rapid development of China's welded pipe industry, as the national economy has entered a new normal, the pace of development has been gradually reduced. The contradiction between overcapacity and demand reduction has become increasingly prominent. Since the second half of 2013, due to the delay of the key oil and gas pipeline projects, the amount of pipeline steel pipe has been greatly reduced, the orders of enterprises have been seriously inadequate, the economic benefits have dropped, the output growth of welded pipe has dropped sharply, the export pipe rate has hit a record low, the price has fallen, Encountered a great deal of difficulty. Under the new normal, China's welded pipe enterprises have been making positive changes in the mode of development, focusing on the implementation of process improvement and technological innovation as the focus of work, promoting the upgrading of grades and the adjustment of product structure, and improving the performance and quality of steel pipe products in an all-round way, achieving great achievements in scientific and technological progress .

China's oil and gas pipelines still have more room for development. The state's "13th Five-year Plan for Natural Gas Development" has set a new grand goal. In 2017, the Sino-Russian crude oil pipeline, Shaanxi-Beijing natural gas fourth line, and the Sino-Russian natural gas pipeline east line have been started , Oil and gas pipeline construction gradually restored, pipe market will gradually improve. Believe that China's welded pipe industry through structural adjustment, independent innovation and market development, can usher in new developments.

Sun Yongxi, chairman of Shanghai Steel Tube Industry Association Expert Committee, made a discussion on the transformation and upgrading of China's small and medium-sized steel pipe enterprises after the 19th National Congress.

The main point of view is: the future competition in the steel pipe industry will no longer be the price of competition, but the efficiency and quality of competition. In the pipe industry manufacturing capacity surplus today, corporate profits or losses can not be avoided. In this case, how to get out of the woods, relying on the model to achieve adjustment, the future of the industry? It is something we all care about. After the industry surplus, relying on technological progress and management innovation, adjust product structure, improve product quality, take the road of quality development has become inevitable. The main starting point for the adjustment is "innovation", which requires innovating the business model of the enterprise, innovating the quality management and cost management mode of the enterprise, and innovating the path of the new product development of the enterprise.

Technological innovation is the basis of industrial upgrading. The upgrading strategy includes: setting up product concept, selecting appropriate market and formulating the correct product upgrade plan. Take the difference, high value-added, quality steel pipe path. "Manufacturing quality steel pipe, create integrity brand" to produce quality steel as the dominant ideology. Transformation and upgrading is not necessarily to expand the scale and open up new areas. But according to market changes, constantly adjust the product structure and improve product quality, itself is the result of transformation and upgrading, doing fine and excellent products are the best embodiment of their transformation and upgrading.

At the conference, 14 papers on welded steel pipe were published, and after careful evaluation by experts, 2 papers were selected as the first prize. Shanghai Steel Tube Specialist Committee member and chief expert of Baosteel Steel Division Xie Shiqiang "UOE welded pipe for acidic environment And application "Bohai Steel and Steel Design and Research Institute Engineer Xu Gang" SAW pipe end weld grinding robot. " 3 papers were awarded the second prize, Zhao Bo, Bohai Steel Pipe Design and Research Institute, "a large wire dry elongation multi-wire submerged arc welding process," Professor Shaw Fu Yan, Yanshan University "API5L HF - ERW steel quality overall evaluation "And Baoji Petroleum Pipe Co., Ltd. Liu Haizhang engineer" set for oil and gas with 2205 / X65 bimetallic composite pipe and welding process. "

development trend
The meeting of professional research papers have three issues worthy of our attention, but also reflects the Chinese welded steel pipe industry in 2017 specializes in the new transformation and upgrading of the development trend:

Baosteel's research on pipeline steel technology has been at the forefront of the world's peers
1, With the increase of steel grade and the increase of hardness, it is more and more difficult to resist the HIC and anti-SSCC performance of pipeline steel. X65MS is still the mainstream steel of pipeline steel used in acidic environment in the international market. In the actual project, X65MS and above steel tend to use round rod-like tensile test. X70MS and X80MS steels also have a small amount of engineering applications. It is recommended to test HIC performance or SSCC performance based on the actual service environment.
2, pure steel and stable rolling for the economical application of coil plate and some steel plate in acid environment with the pipeline created the conditions for pipe.
3. Since its commissioning in 2008, Baosteel UOE has carried out a series of research and development on pipeline for acidic environment. Through design of pure and reasonable components with low C, low Mn, ultra-low P and S, non-metallic inclusions and centers Segregation control, TMCP rolling process for the production of steel pipe raw materials (including coiled open plate), and by controlling the maximum compression rate of 0.25% and 0.8% -1.2% expansion rate to reduce and homogenize the pipe to obtain high residual stress Required dimensional accuracy, X65 and below LSAW pipe mechanical properties and anti-HIC, SSCC excellent performance, has achieved bulk commercial supply to meet the service conditions of the X70MS UOE pipe has also been developed.

Robot has been in our country welded steel pipe business began to apply
Pipe-end weld grinding machine is used for straight seam and spiral submerged arc welding pipe end of the grinding process technology and equipment. Now the internal and external weld grinding by manual control of the internal weld grinder and external weld grinder to complete, take up more work stations, the configuration of more operators, material transport time is long, and not easy to ensure that the weld grinding quality. In order to solve the above problems existing in the existing grinding machine, the modern inspection, control and network communication technology are used to develop the welding robot for the inside and outside of the submerged arc welding pipe to realize the automatic grinding of the internal and external weld.
This is an innovation. The intelligentization of production equipment, workshop automation, network management and the socialization of factors of production are collectively referred to as the emergence of Industry 4.0 and Industry 4.0, which is the way out for the industry to explore in its own development. Highly intelligent processing equipment, which is the future development of steel pipe manufacturing industry.

There are 3 papers around the bimetal composite steel pipe research, it is worth attention
Research and Development of Composite Pipeline Steel Products by Dr. Liang Xiaojun of Baosteel Central Research Institute, "Research on Welding Technology of Bimetal Nickel Base 825 Composite Pipe by Wei Tao Engineer of Harbin Welding Research Institute", Baoji Petroleum Pipe Co., Oil and Gas Pipe Engineering Research Center) Liu Haizhang engineers, "Oil and Gas gathering with 2205 / X65 bimetallic metallurgy composite pipe and welding process."

Lined 2205 stainless steel Applications:
Petrochemical industry: Mainly used in the gathering and transportation of acid oil and gas fields containing Cl- / CO2 and H2S corrosive media, offshore pipelines and chemical heat exchangers.
Seawater treatment: Pitting and crevice corrosion are caused by the increase of the corrosion potential due to the microbial membrane produced by seawater on the metal surface, which is used to make seawater exchangers.
Paper industry: Due to wear-resistant corrosion, stress corrosion and fatigue corrosion good performance, for paper pressure rollers, pulp digesters and so on.
Fertilizer industry: chloride ion water heat exchange equipment.
Composite pipe welding is dissimilar metal welding, need stratified welding, that is, stratification, transitional and primary welding using multi-layer multi-pass welding. It is necessary to consider the development of welding process from the aspects of welding groove design, welding method selection, welding material optimization, welding order and so on to ensure the good mechanical properties of the welded joint and ensure the corrosion resistance of the cladding weld.

(The above article is reprinted in Shanghai Pipe Industry Association)