Yinguomao, academician of Chinese Academy of engineering and senior engineer of Chengdu Iron and Steel Co., Ltd., made a comprehensive and thorough analysis of the current situation, existing problems and development prospects of seamless steel pipe technical equipment in China, and put forward many suggestions, which attracted the attention of the representatives.

Academician Yan reviewed and summarized the production of seamless steel pipes since the construction of China: when the founding of new China, China could not produce seamless steel pipes. On October 27, 1953, Anshan steel seamless steel pipe factory successfully rolled out the first seamless steel pipe in China, and since then ended the history that China could not produce seamless steel pipes. The output of seamless steel pipe in 2004 has reached 9.08 million tons, of which 200000 tons of stainless steel seamless pipe has become a big country in the world. Since 2003, China has changed from a net importer to a net exporter. In 2003, the import volume of seamless steel pipe was 470000 tons, and the export volume was 560000 tons; in 2004, the import volume was 690000 tons and the export volume was 750000 tons, and great progress was made.

At present, the seamless steel pipe technology equipment in China has complete types and specifications. In particular, the hot rolled seamless steel pipe equipment: since the construction and production of the Ф 140mm automatic pipe rolling unit in 1953, a large number of small (Ф 50mm- Ф 100mm) piercers and automatic, three roll, continuous rolling and disc rolling units have been successively developed, developed, developed, designed, manufactured and put into operation. A batch of pipe jacking, large automatic, expanding and three roll rolling units have been introduced successively. In the later period, a batch of pipe jacking, large automatic, expanding and three roll rolling units have been introduced, which in the later period, a batch of pipe jacking, large-scale automatic, expanding and three roll rolling units The incoming three roll, precision and continuous rolling units, about 9 categories of 38 sets of existing (including under construction) hot rolled seamless steel pipe units, namely continuous rolling pipe, automatic rolling pipe, periodic rolling pipe, heat expanding pipe, precision rolling pipe, disc rolling pipe, three roll rolling pipe, pipe jacking, extrusion pipe and planetary rolling pipe mill, with the outer diameter of products of Ф 21.3mm- Ф 1100mm and design capacity of 5.04-5.14 million tons. It should be said that China is the most consistent type and specification of the world hot rolled pipe units, the latest and most advanced unit summary of the world hot rolled seamless steel pipes, and the experimental ground for the latest equipment and units in the world.

The development of cold dial and cold rolling seamless steel pipe equipment in China: in the late 1930s, screw type pulling and pulling machine was built in Shanghai; chain type pulling and pulling machine was built in the 1940s; two and three high cold rolling mills were built in 1950s; spinning pipe rolling machine was built in 1960s; hydraulic cold tapping machine was built in 1970s; advanced cold rolling machine with high speed, high speed and large diameter was introduced in 1980s Pipe machine. According to incomplete statistics, there are nearly 1000 cold rolling mill tubes in China, including more than 300 domestic two roll units, more than 600 multi roll units and 43 imported units.

At present, the production equipment level of seamless steel pipe in China is uneven, which is both backward and advanced. The early construction of seamless hot rolling wool and waste pipe production equipment is relatively simple, backward technology, high consumption, serious pollution, and has been basically discontinued, but some are still in the state of half stop and half open. Some equipment has been adjusted and transformed, and is specially used for producing single varieties, such as bearing pipe, low and medium pressure boiler pipe, structural pipe, fluid conveying pipe, etc. the equipment is adjusted and modified according to the quality and requirements of its positioning variety and specification, so as to achieve the advanced process of reducing investment, reducing consumption and reducing cost.

Typical modern equipment in hot rolling pipe units mainly includes continuous rolling unit, precision pipe rolling unit, Ф 400mm automatic pipe rolling unit, three roll pipe rolling unit, pipe jacking unit, etc. some of these units are of advanced equipment level and reach international level. For example, the 108 three roll pipe rolling unit, which was designed in 1968, passed the 1979 experiment and trial rolling, passed the ministerial level appraisal in 1980, and was approved by the original Ministry of metallurgy in 1984, and the land relocation supporting transformation was carried out. In 1987, it was completed and put into operation, and the renovation and transformation was completed in 2002. The equipment level reached the highest level of the three roll pipe rolling unit. The whole unit can be operated automatically by computer or operated by manual. Moreover, the domestic 102 pipe jacking unit was built and put into operation in 1988. It is equipped with electrical transmission control, instrument and instrument measurement and adjustment, and interlocking operation control system, which is the higher level of pipe jacking unit in 1980s.

In terms of technical equipment and production development prospects of seamless steel pipe, China is not a powerful producer of seamless steel pipe in the world. At present, there are few kinds of seamless steel pipes with high quality, low consumption and high added value, which can not meet the needs of domestic market. For example, the gap of special oil well pipes such as high strength, special sealing buckle, low temperature resistance, corrosion resistance (hydrogen sulfide, carbon monoxide, etc.), and compression break is large, which makes the well pipe still need to import 300000 tons every year. In addition, the variety, quality and consumption of seamless steel pipe are difficult to exceed the design level. Compared with the advanced level abroad, there are still some gaps, especially in the quality, service life, price ratio and other aspects, it is difficult to have competitiveness. In the equipment of the unit, it is also necessary to further improve, such as the cold rolling pipe equipment, which is still quite different from the advanced level of the world. In foreign countries, high speed, ultra long stroke rolling and double rotation double feed have been adopted. Continuous feeding and continuous rolling are adopted in the rolling process and computer control is adopted to realize automatic operation.

The production layout of seamless steel pipe in China is unbalanced, and it is scattered and poor in concentration. From the perspective of six major regions in China, the production of seamless steel pipes in Northwest China is very low, with an annual output of 60000 tons; so far, there are no seamless steel pipe factories in Ningxia, Gansu, Xinjiang, Hainan, Hong Kong, Macao and Taiwan provinces, autonomous regions and special zones. Among 26 provinces and cities with production plants in China, the output varies greatly, with 10 provinces and cities with annual output of over 200000 tons; only six provinces and cities with annual output of over 500000 tons are Tianjin, Shanghai, Inner Mongolia, Jiangsu, Shandong and Sichuan; among these six provinces and cities, the largest is Jiangsu, with the output of 950000 tons in 2003; the largest enterprise is Tianjin steel pipe company, and in 2003, the largest enterprise is Tianjin steel pipe company, and in 2003, the largest one is Tianjin steel pipe company The output reaches 81000 tons; the enterprises with annual output of more than 500000 tons are only Tianguan, Baosteel, Baogang, Chengdu and other four enterprises, which can see the degree of dispersion.

The following suggestions are given on how to change the production layout and product variety, quality and equipment existing in domestic seamless steel pipe industry

First, give full play to the advantages of the existing advanced equipment. At present, there are still some seamless steel tube mills with high equipment level in China, which have not fully developed their equipment features, and have not played their unique characteristics in variety, quality and consumption. If there are manufacturers producing high-grade high-pressure boiler pipes, there is no large production and the production capacity is empty, which leads to a large number of high-pressure boiler pipes imported in recent years; the manufacturers with high-grade oil well pipes have not provided a large number of special oil well pipes such as high-strength, special sealing buckle, low temperature resistance, corrosion resistance (hydrogen sulfide, carbon monoxide, etc.) and compression break for the market, which makes downstream industries have to import from abroad To make up for the shortage; the manufacturers with tension reducing mill have not produced large quantities of small-diameter hot rolled seamless steel pipes, which leads to the production of seamless steel pipe unit ≤ Ф 76mm which is officially shut down by the state. At present, the seamless steel pipe units in China have made outstanding achievements in the production and expansion of the upper limit specification. The output and upper limit specifications often exceed 20-30% of the design capacity, even more than 50%; in terms of variety, quality and consumption, it is difficult to exceed the design level. Therefore, we must pay attention to and strengthen the construction of technical team, scientific research and development, and guarantee the funds, give full play to the advantages of advanced equipment, and make it have the greatest effect.

Second, accelerate the development, design and manufacture of advanced equipment for small diameter seamless steel pipes. As soon as possible, 1-2 sets of advanced small diameter units with high yield and low consumption shall be built to replace the existing low-end and high consumption units. Based on the design, manufacturing capacity and level of the existing seamless steel pipe equipment in China, the paper summarizes the Φ 102mm (using Φ 150 tube blank, producing Φ 45-114 * 3.75-7mm seamless steel pipe with an annual output of 800000 tons) of the first new ural steel pipe factory in Russia, and Baosteel Φ 140mm (using Φ 175mm tube blank, producing Φ 21-140-180*2-25mm seamless steel pipe, and output of 846000 tons in 2004) floating mandrel continuous rolling pipe Based on the experience of the unit and various new continuous rolling mills, a new set of short-process seamless steel pipe production lines, which are from steelmaking, refining after furnace, continuous casting, rolling and finishing, has been developed, designed and manufactured. This production line is located in the special production of a wide range of large quantities of small diameter hot rolled pipes (structural pipes, conveying pipes), to replace the existing high consumption, high pollution of the backward small units. This is a solution to the problem of "cold tap instead of hot rolled pipe" which has been existed for a long time in seamless steel pipe industry in China, and also a solution to the problem of high consumption and high pollution in seamless steel pipe industry.

Third, adjust and transform the distribution of some existing general pipe rolling units and improve the concentration of enterprises, and establish a large seamless steel pipe group company. Take advantage of the opportunity of rectifying, adjusting, reforming and reorganizing the existing seamless steel pipe unit (mainly the production unit of wool pipe and waste pipe), seize the opportunity of local solution to the local recycling of scrap steel, adjust it according to the region, make the seamless steel pipe with more general use and demand, realize self supply in the region, achieve reasonable organization of logistics, avoid long-distance transportation and save Comprehensive benefits of capacity and cost reduction. At the same time, we must change the situation of extremely scattered production layout as soon as possible, establish cross regional and cross departmental group companies, improve enterprise concentration, enhance international competitiveness and occupy more international market share, so as to meet the needs of the sustainable development of the whole country's economy, so that China will become a real seamless steel pipe production power.

Academician Yan analyzed the current situation of seamless steel pipe technical equipment in China, and he said that at present, the types and specifications of seamless steel pipe technical equipment in China are complete. In particular, the hot rolled seamless steel pipe equipment: since the construction and production of the Ф 140mm automatic pipe rolling unit in 1953, a large number of small (Ф 50mm- Ф 100mm) piercers and automatic, three roll, continuous rolling and disc rolling units have been successively developed, developed, developed, designed, manufactured and put into operation. A batch of pipe jacking, large automatic, expanding and three roll rolling units have been introduced successively. In the later period, a batch of pipe jacking, large automatic, expanding and three roll rolling units have been introduced, which in the later period, a batch of pipe jacking, large-scale automatic, expanding and three roll rolling units The incoming three roll, precision and continuous rolling units, about 9 categories of 38 sets of existing (including under construction) hot rolled seamless steel pipe units, namely continuous rolling pipe, automatic rolling pipe, periodic rolling pipe, heat expanding pipe, precision rolling pipe, disc rolling pipe, three roll rolling pipe, pipe jacking, extrusion pipe and planetary rolling pipe mill, with the outer diameter of products of Ф 21.3mm- Ф 1100mm and design capacity of 5.04-5.14 million tons. It should be said that China is the most consistent type and specification of the world hot rolled pipe units, the latest and most advanced unit summary of the world hot rolled seamless steel pipes, and the experimental ground for the latest equipment and units in the world.

The development of cold dial and cold rolling seamless steel pipe equipment in China: in the late 1930s, screw type pulling and pulling machine was built in Shanghai; chain type pulling and pulling machine was built in the 1940s; two and three high cold rolling mills were built in 1950s; spinning pipe rolling machine was built in 1960s; hydraulic cold tapping machine was built in 1970s; advanced cold rolling machine with high speed, high speed and large diameter was introduced in 1980s Pipe machine. According to incomplete statistics, there are nearly 1000 cold rolling mill tubes in China, including more than 300 domestic two roll units, more than 600 multi roll units and 43 imported units.

At present, the production equipment level of seamless steel pipe in China is uneven, which is both backward and advanced. The early construction of seamless hot rolling wool and waste pipe production equipment is relatively simple, backward technology, high consumption, serious pollution, and has been basically discontinued, but some are still in the state of half stop and half open. Some equipment has been adjusted and transformed, and is specially used for producing single varieties, such as bearing pipe, low and medium pressure boiler pipe, structural pipe, fluid conveying pipe, etc. the equipment is adjusted and modified according to the quality and requirements of its positioning variety and specification, so as to achieve the advanced process of reducing investment, reducing consumption and reducing cost.

Typical modern equipment in hot rolling pipe units mainly includes continuous rolling unit, precision pipe rolling unit, Ф 400mm automatic pipe rolling unit, three roll pipe rolling unit, pipe jacking unit, etc. some of these units are of advanced equipment level and reach international level. For example, the 108 three roll pipe rolling unit, which was designed in 1968, passed the 1979 experiment and trial rolling, passed the ministerial level appraisal in 1980, and was approved by the original Ministry of metallurgy in 1984, and the land relocation supporting transformation was carried out. In 1987, it was completed and put into operation, and the renovation and transformation was completed in 2002. The equipment level reached the highest level of the three roll pipe rolling unit. The whole unit can be operated automatically by computer or operated by manual. Moreover, the domestic 102 pipe jacking unit was built and put into operation in 1988. It is equipped with electrical transmission control, instrument and instrument measurement and adjustment, and interlocking operation control system, which is the higher level of pipe jacking unit in 1980s.

When talking about the technical equipment and production development prospect of seamless steel pipe in China, academician Yan pointed out that: at present, China is not a powerful country in the world for seamless steel pipe production. At present, there are few kinds of seamless steel pipes with high quality, low consumption and high added value, which can not meet the needs of domestic market. For example, the gap of special oil well pipes such as high strength, special sealing buckle, low temperature resistance, corrosion resistance (hydrogen sulfide, carbon monoxide, etc.), and compression break is large, which makes the well pipe still need to import 300000 tons every year. In addition, the variety, quality and consumption of seamless steel pipe are difficult to exceed the design level. Compared with the advanced level abroad, there are still some gaps, especially in the quality, service life, price ratio and other aspects, it is difficult to have competitiveness. In the equipment of the unit, it is also necessary to further improve, such as the cold rolling pipe equipment, which is still quite different from the advanced level of the world. In foreign countries, high speed, ultra long stroke rolling and double rotation double feed have been adopted. Continuous feeding and continuous rolling are adopted in the rolling process and computer control is adopted to realize automatic operation.

Academician Yan said that the production layout of seamless steel pipes in China is unbalanced, and is relatively scattered and poor in concentration. From the perspective of six major regions in China, the production of seamless steel pipes in Northwest China is very low, with an annual output of 60000 tons; so far, there are no seamless steel pipe factories in Ningxia, Gansu, Xinjiang, Hainan, Hong Kong, Macao and Taiwan provinces, autonomous regions and special zones. Among 26 provinces and cities with production plants in China, the output varies greatly, with 10 provinces and cities with annual output of over 200000 tons; only six provinces and cities with annual output of over 500000 tons are Tianjin, Shanghai, Inner Mongolia, Jiangsu, Shandong and Sichuan; among these six provinces and cities, the largest is Jiangsu, with the output of 950000 tons in 2003; the largest enterprise is Tianjin steel pipe company, and in 2003, the largest enterprise is Tianjin steel pipe company, and in 2003, the largest one is Tianjin steel pipe company The output reaches 81000 tons; the enterprises with annual output of more than 500000 tons are only Tianguan, Baosteel, Baogang, Chengdu and other four enterprises, which can see the degree of dispersion.

Academician Yan proposed how to change the production layout and product variety, quality and equipment existing in domestic seamless steel pipe industry

First, give full play to the advantages of the existing advanced equipment. At present, there are still some seamless steel tube mills with high equipment level in China, which have not fully developed their equipment features, and have not played their unique characteristics in variety, quality and consumption. If there are manufacturers producing high-grade high-pressure boiler pipes, there is no large production and the production capacity is vented, which leads to a large number of high-pressure boiler pipes imported in recent years; the manufacturers with high-grade oil well pipes have not provided a large number of special oil well pipes such as high-strength, special sealing buckle, low temperature resistance, corrosion resistance (hydrogen sulfide, carbon monoxide, etc.) and compression break for the market, which makes downstream industries have to go from China