China's roll product structure still needs to be optimized


Release time:

2023-03-01

Over the years, China's roll manufacturing industry has experienced the introduction of rolling mill to develop supporting rolls, the realization of roll manufacturing localization, batch export of high-end rolls and other stages of development, has formed a complete roll manufacturing system, to become big country of roll manufacturing, and fostered the world's first roll production capacity of Sinosteel Xingji and a number of specialization advantages of the relatively obvious roll manufacturing enterprises.

Over the years, China's roll manufacturing industry has experienced the introduction of rolling mill to develop supporting rolls, the realization of roll manufacturing localization, batch export of high-end rolls and other stages of development, has formed a complete roll manufacturing system, to become big country of roll manufacturing, and fostered the world's first roll production capacity of Sinosteel Xingji and a number of specialization advantages of the relatively obvious roll manufacturing enterprises.

However, experts pointed out that although we have made significant breakthroughs in some roll manufacturing technology, some roll varieties have reached or exceeded the level of similar foreign products, but the overall level of the industry is uneven, and some high-end products are still dependent on imports. Therefore, it is necessary to continuously enhance the ability of independent innovation, accelerate scientific and technological progress and new product development in order to enhance the competitiveness of China's rolls in the international market.

Rapidly improving the level of equipment and production technology is becoming more and more advanced

In the face of the rapid development of the iron and steel industry, China's roll manufacturing enterprises continue to increase the scale of capital investment, accelerate the pace of technological transformation. The transformation of technology and equipment so that the intrinsic quality of China's rolls greatly improved, but also directly promote the progress of roll manufacturing technology. At present, the centrifugal composite casting process has become China's roll manufacturing enterprises commonly used advanced technology.

In order to shorten the production cycle, improve the use of roll performance, heat treatment has become a roll manufacturing enterprises to improve market competitiveness of the core technology. Such as Sinosteel Xingji, in recent years, through the use of electric furnace smelting + ladle refining + electroslag remelting triple steel smelting technology, electroslag ingot forging molding technology, as well as dual-frequency quenching, liquid nitrogen deep-cooling, high and medium low-temperature tempering and other international first-class advanced heat treatment technology, so that the Cr3, Cr5, Cr8 series of forged steel cold rollers depth of the working layer of the quenching layer, compared with the conventional cold rolls is nearly three times higher, thus effectively reducing the mill This effectively reduces the mill's roll replacement frequency, greatly improving the service life of the rolls, the rolling quality of steel and production efficiency.

Overview, the domestic roll manufacturing equipment and technology level has reached the world's advanced level, especially in the steel Xingji as the representative of some of the advantages of the enterprise, in the roll production process continue to strengthen the "mechanization, automation, intelligence, digitalization," the process control means, has stepped into the forefront of the world's roll manufacturing technology. But there are still some small-scale, poor strength of small roll plant, unable to change the status quo of backward equipment and technology, can only continue to resource consumption and environmental pollution caused by backward production methods, the production of some ordinary, conventional low-end products. This is the overall development of China's roll manufacturing industry is a matter of concern.

Rapid expansion of production capacity varieties still need to optimize the structure

After years of development, the current domestic roll manufacturing enterprises can produce different materials, different specifications, different varieties of rolls, to meet the needs of various types of domestic mills.

For example, Sinosteel Xingji has developed more than 50 kinds of rolls to replace imported products, and its self-developed large composite cast steel support rolls, semi high-speed steel rolls, high-quality centrifugal composite rolls, etc., have been close to or reached the world's advanced level. In addition, TISCO and Sweden Axe joint venture, a heavy joint venture with Germany Yilel, Baosteel and Hitachi joint venture, are in the introduction of foreign capital and technology at the same time, accelerating the progress and development of China's roll manufacturing technology.

However, China's roll manufacturing industry, although the continuous expansion of production capacity, technology continues to progress, but in the optimization and adjustment of species structure, has not yet fully kept pace with the technological progress of the iron and steel industry and structural optimization and adjustment. Overproduction of low-end products, high-end products, production capacity is obviously insufficient, such as high-speed steel, high-speed steel rolls, only a few domestic steel Xingji and other enterprises with mass production capacity, market share is low; domestic new and proposed on more than 5 meters wide plate mill, due to the specifications of the special, large work rolls, support rolls, etc., are still completely dependent on imports. Therefore, the overall manufacturing level of China's rolls still needs to be improved, in order to solve the modernization of rolling mills equipped with high-performance rolls of the world's problems, we must continue to enhance the ability of independent innovation, accelerate scientific and technological progress and the speed of research and development of new products.

Material series development roll consumption continues to reduce

After years of research and exploration, the domestic cast iron rolls from the past cold hard cast iron, infinite cold hard, cold hard ductile iron and other conventional materials, the development of the current pearlitic ductile iron, needle-like organization of ductile iron, high-nickel chromium infinite cold hard cast iron, high chromium cast iron, and other new roll materials. In order to meet the needs of different mills, a variety of different materials roll performance is also constantly refined and optimized, such as for wide plate mill, furnace coil mill and strip steel hot strip mill with high nickel-chromium infinite cold hardening rolls, for strip steel hot strip mill roughing, finishing mill before the high-chromium cast iron work rolls, high chromium iron work rolls for wide plate mill and high chromium iron work rolls and leveling mill with high chromium iron work rolls and so on, have shown the superiority of the new material. At the same time as the optimization of the varieties of rolls made of different materials, the product performance is also


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