The future of China's roll manufacturing industry
author: Glimpse technology
2022-09-07
The future of China's roll manufacturing industry
Overview: This paper introduces the current situation of China's mill roll manufacturing industry, explores the limitations of China's manufacturing industry development and the corresponding methods.
1. The product structure of Chinese mill rolls still needs to be optimized
Over the years, my country's mill roll manufacturing industry has formed a complete mill roll manufacturing system after developing supporting rolls for the introduction of rolling mills, realizing the localization of mill roll manufacturing, and exporting high-end mill rolls in large scale. Sinosteel Xingji, which has the world's largest roll production capacity, and a group of roll manufacturing enterprises with relatively obvious specialization advantages have been cultivated.
However, experts pointed out that although we have made major breakthroughs in some roll manufacturing technologies, and some roll varieties have reached or exceeded the level of similar foreign products, the overall level of the industry is uneven, and some high-end products still rely on imports. Therefore, it is necessary to continuously enhance the ability of independent innovation, speed up scientific and technological progress and the speed of research and development of new products, in order to enhance the competitiveness of my country's rolls in the international market.
The equipment level has been improved rapidly, and the production technology has become more and more advanced. Facing the rapid development of the iron and steel industry, Chinese roll manufacturing enterprises have continuously increased the scale of capital investment and accelerated the pace of technological transformation. The transformation of technical equipment has greatly improved the inherent quality of my country's rolls, and also directly promoted the progress of roll manufacturing technology. At present, the centrifugal composite casting process has become an advanced process commonly used by Chinese roll manufacturing enterprises.
In order to shorten the production cycle and improve the performance of the rolls, heat treatment has become the core technology for roll manufacturers to improve their market competitiveness. For example, Sinosteel Xingji, in recent years, has adopted the triple molten steel smelting technology of electric furnace smelting + ladle refining + electroslag remelting, electroslag ingot forging and forming technology, dual frequency quenching, liquid nitrogen cryogenic treatment, high, medium and low temperature tempering, etc. Advanced heat treatment technology makes the depth of hardened layer of working layer of Cr3, Cr5 and Cr8 series forged steel cold rolls nearly 3 times higher than that of conventional cold rolls, thus effectively reducing the roll changing frequency of the rolling mill, greatly improving the service life of the rolls and improving the quality of the steel. rolling quality and production efficiency.
Looking at the overall situation, the equipment technology level of the domestic roll manufacturing industry has reached the world's advanced level, especially some advantageous enterprises represented by Sinosteel Xingji, constantly strengthening the "mechanization, automation, intelligence and digitalization" in the roll production process. The process control method has entered the forefront of the world's roll manufacturing technology. However, there are still some small-scale and low-strength small roll factories, unable to change the status quo of backward equipment and technology, and can only continue the backward production methods that consume a lot of resources and cause pollution to the environment, and produce some ordinary, conventional low-end products. This is an issue worthy of attention in the overall development of China's roll manufacturing industry.
2. The structure of varieties with rapid capacity expansion still needs to be optimized
After years of development, domestic roll manufacturers can now produce various rolls of different materials, specifications and varieties to meet the needs of various domestic rolling mills.
For example, Sinosteel Xingji has developed more than 50 kinds of imported roll products, and its self-developed large-scale composite cast steel backup rolls, semi-high-speed steel rolls, and high-quality centrifugal composite rolls have approached or reached the world's advanced level. In addition, the joint venture between TISCO and Sweden Akers, the joint venture between CFHI and Germany Illel, and the joint venture between Baosteel and Hitachi have accelerated the progress and development of China's roll manufacturing technology while introducing foreign capital and technology.
However, although China's roll manufacturing industry continues to expand its production capacity and make continuous progress in technology, it has not completely kept up with the pace of technological progress and structural optimization and adjustment in the steel industry in terms of product structure optimization and adjustment. Low-end products are over-produced, and high-end products are obviously insufficient in production capacity, such as high-speed steel and semi-high-speed steel rolls. At present, only a few domestic enterprises such as Sinosteel Xingji have mass production capacity, and their market share is relatively low; As well as several planned rolling mills for wide and thick plates over 5 meters, due to the special specifications, the required super-large work rolls, backup rolls, etc. are completely dependent on imports. Therefore, the overall manufacturing level of my country's rolls still needs to be improved. In order to solve the worldwide problem of equipping modern rolling mills with high-performance rolls, it is necessary to continuously enhance the ability of independent innovation, and speed up scientific and technological progress and new product research and development.
The development of material serialization brings continuous reduction of roller consumption
After years of research and exploration, domestic cast iron rolls have developed from conventional materials such as chilled cast iron, infinite chilled, chilled ductile complex cast iron to the current pearlite ductile iron, acicular ductile iron, high nickel-chromium infinite Chilled cast iron, high chromium cast iron and other new roll materials. In order to meet the needs of different rolling mills, the performance of rolls of various materials is also being refined and optimized. Hot tandem rolling mill, high-chromium cast iron work rolls in the front section of finishing rolling, high-chromium iron work rolls for wide and heavy plate mills, and high-chromium iron work rolls for skin-pass mills all show the superiority of new materials. While optimizing the varieties of rolls of different materials, the product performance is constantly developing to a higher level.
my country's roll manufacturing enterprises have formed a series of roll materials through independent research and development and technology introduction for different types of rolling mills and operating environments. The rolls are basically in line with the foreign advanced level. For example, the hot-rolled strip vertical rolls used for lateral pressure rolling, and the centrifugal high-chromium steel composite vertical rolls are actually rolled on Baosteel's 1580 rolling line, and the use effect is doubled compared with alloy semi-steel materials. The two-roll reversible roughing roll at the front end of the rolling line of the wide and heavy plate and hot strip mill has a long contact time with the high temperature steel billet, and because there is no backup roll, it bears a large bending moment and torque, and must have high resistance to thermal cracking, Bite and strength. In view of these characteristics, in recent years, the overall casting and composite casting tool steel rough rolls developed by domestic roll companies have doubled the product performance. The production of semi-high-speed steel and high-speed steel rolls also marks that the manufacturing level of China's forged steel cold rolls has reached the world's advanced level. With the continuous advent of new material rolls and the continuous increase of modern rolling mills, the average roll consumption per ton of steel continues to decrease. With the technological progress of the iron and steel industry and the in-depth research and application of new roll materials in the roll manufacturing industry, the consumption of rolls in the future will be further reduced.
3. The development space is broad, and the technological progress is not indefinite.
Although some domestic advantageous enterprises have implemented computer control in the roll casting and processing process, and have formed comparative advantages in terms of production efficiency, product quality and cost indicators, there are still high-tech, high-value-added high-end products in the entire roll industry in my country. Some varieties still need to rely on imports to supplement the unbalanced situation. In order to improve the consistency and stability of roll products, maintain the leading edge of technology, and enhance the competitiveness of the international market, it is necessary to take corresponding measures to address the common problems of lack of basic research on roll materials, poor original innovation and poor research and new product development capabilities. Efforts are made to change the disadvantaged position of most roll companies in product positioning, technological improvement, new product development, quality improvement, cost control, etc. The specific measures include:
First, integrate resources, integrate advantages, and strengthen investment in roll research and development. In particular, enterprises with strong independent research and development strength should be market-oriented, aim at the most cutting-edge technology of roll manufacturing in the world, implement key breakthroughs in key technologies, form core technologies and unique products with independent intellectual property rights, and communicate with them through technical exchanges. Cooperation drives the technological progress of the entire roll industry.
Secondly, make good use of both domestic and foreign resources, develop two markets, and continuously improve and improve the equipment and technology level of roll manufacturing. Qualified enterprises should concentrate their efforts on the research on the manufacturing equipment technology of extra-large rolls that are in short supply in China, develop high-end products that are in short supply in the market, and accelerate technological upgrading and management optimization by increasing international capital and technical cooperation to continuously improve roll products. The technical content and quality level of the company will stabilize the domestic market and actively expand the international market, create a world brand of Chinese rolls, and form new advantages in international cooperation and competition under the conditions of global economic integration.
Again, actively carry out strategic restructuring and cooperation. my country's roll industry as a whole has the characteristics of "small and scattered, many and chaotic", but after long-term practical exploration, the roll manufacturing technology is basically mature, and some relatively powerful roll manufacturing enterprises have also formed their own varieties and processes. characteristics and comparative advantages of a specialised roll sector. In order to survive and develop in the market environment of "domesticization of international competition and internationalization of domestic competition", my country's roll industry must change the state of mutual blockade and fight against each other, and change the competition that is a mutual barrier into the integration of resource sharing. Therefore, it is necessary to actively promote the adjustment of the enterprise structure of the roll manufacturing industry, implement strong alliances, and expand While strengthening China's roll manufacturing industry, it provides high-quality services and strategic support for the realization of my country's iron and steel industry from big to strong.
Key words: mill roll, mill roll manufacturer, roll technology development, Chinese roll industry
Overview: This paper introduces the current situation of China's mill roll manufacturing industry, explores the limitations of China's manufacturing industry development and the corresponding methods.
1. The product structure of Chinese mill rolls still needs to be optimized
Over the years, my country's mill roll manufacturing industry has formed a complete mill roll manufacturing system after developing supporting rolls for the introduction of rolling mills, realizing the localization of mill roll manufacturing, and exporting high-end mill rolls in large scale. Sinosteel Xingji, which has the world's largest roll production capacity, and a group of roll manufacturing enterprises with relatively obvious specialization advantages have been cultivated.
However, experts pointed out that although we have made major breakthroughs in some roll manufacturing technologies, and some roll varieties have reached or exceeded the level of similar foreign products, the overall level of the industry is uneven, and some high-end products still rely on imports. Therefore, it is necessary to continuously enhance the ability of independent innovation, speed up scientific and technological progress and the speed of research and development of new products, in order to enhance the competitiveness of my country's rolls in the international market.
The equipment level has been improved rapidly, and the production technology has become more and more advanced. Facing the rapid development of the iron and steel industry, Chinese roll manufacturing enterprises have continuously increased the scale of capital investment and accelerated the pace of technological transformation. The transformation of technical equipment has greatly improved the inherent quality of my country's rolls, and also directly promoted the progress of roll manufacturing technology. At present, the centrifugal composite casting process has become an advanced process commonly used by Chinese roll manufacturing enterprises.
In order to shorten the production cycle and improve the performance of the rolls, heat treatment has become the core technology for roll manufacturers to improve their market competitiveness. For example, Sinosteel Xingji, in recent years, has adopted the triple molten steel smelting technology of electric furnace smelting + ladle refining + electroslag remelting, electroslag ingot forging and forming technology, dual frequency quenching, liquid nitrogen cryogenic treatment, high, medium and low temperature tempering, etc. Advanced heat treatment technology makes the depth of hardened layer of working layer of Cr3, Cr5 and Cr8 series forged steel cold rolls nearly 3 times higher than that of conventional cold rolls, thus effectively reducing the roll changing frequency of the rolling mill, greatly improving the service life of the rolls and improving the quality of the steel. rolling quality and production efficiency.
Looking at the overall situation, the equipment technology level of the domestic roll manufacturing industry has reached the world's advanced level, especially some advantageous enterprises represented by Sinosteel Xingji, constantly strengthening the "mechanization, automation, intelligence and digitalization" in the roll production process. The process control method has entered the forefront of the world's roll manufacturing technology. However, there are still some small-scale and low-strength small roll factories, unable to change the status quo of backward equipment and technology, and can only continue the backward production methods that consume a lot of resources and cause pollution to the environment, and produce some ordinary, conventional low-end products. This is an issue worthy of attention in the overall development of China's roll manufacturing industry.
2. The structure of varieties with rapid capacity expansion still needs to be optimized
After years of development, domestic roll manufacturers can now produce various rolls of different materials, specifications and varieties to meet the needs of various domestic rolling mills.
For example, Sinosteel Xingji has developed more than 50 kinds of imported roll products, and its self-developed large-scale composite cast steel backup rolls, semi-high-speed steel rolls, and high-quality centrifugal composite rolls have approached or reached the world's advanced level. In addition, the joint venture between TISCO and Sweden Akers, the joint venture between CFHI and Germany Illel, and the joint venture between Baosteel and Hitachi have accelerated the progress and development of China's roll manufacturing technology while introducing foreign capital and technology.
However, although China's roll manufacturing industry continues to expand its production capacity and make continuous progress in technology, it has not completely kept up with the pace of technological progress and structural optimization and adjustment in the steel industry in terms of product structure optimization and adjustment. Low-end products are over-produced, and high-end products are obviously insufficient in production capacity, such as high-speed steel and semi-high-speed steel rolls. At present, only a few domestic enterprises such as Sinosteel Xingji have mass production capacity, and their market share is relatively low; As well as several planned rolling mills for wide and thick plates over 5 meters, due to the special specifications, the required super-large work rolls, backup rolls, etc. are completely dependent on imports. Therefore, the overall manufacturing level of my country's rolls still needs to be improved. In order to solve the worldwide problem of equipping modern rolling mills with high-performance rolls, it is necessary to continuously enhance the ability of independent innovation, and speed up scientific and technological progress and new product research and development.
The development of material serialization brings continuous reduction of roller consumption
After years of research and exploration, domestic cast iron rolls have developed from conventional materials such as chilled cast iron, infinite chilled, chilled ductile complex cast iron to the current pearlite ductile iron, acicular ductile iron, high nickel-chromium infinite Chilled cast iron, high chromium cast iron and other new roll materials. In order to meet the needs of different rolling mills, the performance of rolls of various materials is also being refined and optimized. Hot tandem rolling mill, high-chromium cast iron work rolls in the front section of finishing rolling, high-chromium iron work rolls for wide and heavy plate mills, and high-chromium iron work rolls for skin-pass mills all show the superiority of new materials. While optimizing the varieties of rolls of different materials, the product performance is constantly developing to a higher level.
my country's roll manufacturing enterprises have formed a series of roll materials through independent research and development and technology introduction for different types of rolling mills and operating environments. The rolls are basically in line with the foreign advanced level. For example, the hot-rolled strip vertical rolls used for lateral pressure rolling, and the centrifugal high-chromium steel composite vertical rolls are actually rolled on Baosteel's 1580 rolling line, and the use effect is doubled compared with alloy semi-steel materials. The two-roll reversible roughing roll at the front end of the rolling line of the wide and heavy plate and hot strip mill has a long contact time with the high temperature steel billet, and because there is no backup roll, it bears a large bending moment and torque, and must have high resistance to thermal cracking, Bite and strength. In view of these characteristics, in recent years, the overall casting and composite casting tool steel rough rolls developed by domestic roll companies have doubled the product performance. The production of semi-high-speed steel and high-speed steel rolls also marks that the manufacturing level of China's forged steel cold rolls has reached the world's advanced level. With the continuous advent of new material rolls and the continuous increase of modern rolling mills, the average roll consumption per ton of steel continues to decrease. With the technological progress of the iron and steel industry and the in-depth research and application of new roll materials in the roll manufacturing industry, the consumption of rolls in the future will be further reduced.
3. The development space is broad, and the technological progress is not indefinite.
Although some domestic advantageous enterprises have implemented computer control in the roll casting and processing process, and have formed comparative advantages in terms of production efficiency, product quality and cost indicators, there are still high-tech, high-value-added high-end products in the entire roll industry in my country. Some varieties still need to rely on imports to supplement the unbalanced situation. In order to improve the consistency and stability of roll products, maintain the leading edge of technology, and enhance the competitiveness of the international market, it is necessary to take corresponding measures to address the common problems of lack of basic research on roll materials, poor original innovation and poor research and new product development capabilities. Efforts are made to change the disadvantaged position of most roll companies in product positioning, technological improvement, new product development, quality improvement, cost control, etc. The specific measures include:
First, integrate resources, integrate advantages, and strengthen investment in roll research and development. In particular, enterprises with strong independent research and development strength should be market-oriented, aim at the most cutting-edge technology of roll manufacturing in the world, implement key breakthroughs in key technologies, form core technologies and unique products with independent intellectual property rights, and communicate with them through technical exchanges. Cooperation drives the technological progress of the entire roll industry.
Secondly, make good use of both domestic and foreign resources, develop two markets, and continuously improve and improve the equipment and technology level of roll manufacturing. Qualified enterprises should concentrate their efforts on the research on the manufacturing equipment technology of extra-large rolls that are in short supply in China, develop high-end products that are in short supply in the market, and accelerate technological upgrading and management optimization by increasing international capital and technical cooperation to continuously improve roll products. The technical content and quality level of the company will stabilize the domestic market and actively expand the international market, create a world brand of Chinese rolls, and form new advantages in international cooperation and competition under the conditions of global economic integration.
Again, actively carry out strategic restructuring and cooperation. my country's roll industry as a whole has the characteristics of "small and scattered, many and chaotic", but after long-term practical exploration, the roll manufacturing technology is basically mature, and some relatively powerful roll manufacturing enterprises have also formed their own varieties and processes. characteristics and comparative advantages of a specialised roll sector. In order to survive and develop in the market environment of "domesticization of international competition and internationalization of domestic competition", my country's roll industry must change the state of mutual blockade and fight against each other, and change the competition that is a mutual barrier into the integration of resource sharing. Therefore, it is necessary to actively promote the adjustment of the enterprise structure of the roll manufacturing industry, implement strong alliances, and expand While strengthening China's roll manufacturing industry, it provides high-quality services and strategic support for the realization of my country's iron and steel industry from big to strong.
Key words: mill roll, mill roll manufacturer, roll technology development, Chinese roll industry
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