1) Increase the hot charging temperature and hot charging ratio: Increasing the hot charging temperature and hot charging ratio is an important measure for energy conservation and emission reduction, and has attracted much attention. At present, the average hot charging temperature in my country is 500~600℃, and can reach as high as 900℃; the average hot charging ratio is 40%, and the production line reaches more than 75%. In the future, our country should increase the hot charging ratio of continuous casting billets above 650℃ and strive to save energy by 25% to 35%.

2) Heating technologies of heating furnaces: Heating technologies include regenerative heating, automatic combustion control, low calorific value fuel combustion, low oxidation or non-oxidation heating technology, etc. According to statistics, more than 330 steel rolling heating furnaces in my country use regenerative combustion technology, and the energy-saving effect can reach 20% to 35%. By optimizing combustion, energy consumption can be further reduced. This requires work on the use of low calorific value fuels and increased application of blast furnace gas and converter gas.
The low-oxidation heating technology of atmosphere control and the non-oxidation heating technology of gas protection are important measures to reduce oxidation burning loss and improve the yield rate. This technology can even eliminate the need for pickling. At present, the scale produced by the rolling heating process is 3 to 3.5 kg/t, and the annual loss is estimated to be about 1.5 million tons of steel (about 7.5 billion yuan); according to calculations by European scholars, the cost of pickling is 15 to 20 euros/t. t, if it can be used to reduce pickling and acid consumption, it will have a significant effect on protecting the environment and reducing the pressure of waste acid treatment.

3) Low-temperature rolling and rolling lubrication technology: Domestic high-line manufacturers have adopted low-temperature rolling technology. The average exit temperature has reached 950°C, and the lowest has dropped to 910°C. Some newly built high-line first rolling mills The power has been designed and manufactured according to the rolling temperature of 850℃. The total energy consumption of low-temperature rolling is about 10% to 15% lower than that of conventional rolling. According to statistics from Japan's Kashima Steel Hot Rolling Plant, lowering the billet discharge rate by 8°C will save 4.2kJ/t, with an energy saving effect of 0.057%. However, low-temperature rolling has strict requirements on the uniformity of the heating temperature of the steel billet. The temperature difference across the entire length of the 130-150mm billet should not be greater than 20-25°C.
The rolling lubrication technology can reduce the rolling force by 10% to 30%, reduce the power consumption by 5% to 10%, and reduce the iron oxide scale by about 1kg/t, thereby increasing the yield rate by 0.5% to 1.0% and reducing the acid consumption of pickling. The consumption is about 0.3~1.0kg/t. Many domestic steel rolling mills have successfully used it in the production of stainless steel and electrical steel, with great results. In the future, while vigorously promoting rolling lubrication, we should strengthen the understanding of environmentally friendly rolling lubricating media, lubrication technology, and recycling technology.

4) Controlled rolling and controlled cooling technology and its equipment: Controlled rolling and controlled cooling technology is an indispensable means for energy saving, material saving, high-performance products, and production. Representative steel materials such as DP steel, TRIP steel, TWIP steel, CP steel, AHSS steel, UHSS steel, special pipeline steel, steel for building structures, grain steel, and heat-free steel are all produced using controlled rolling and controlled cooling technology.
In addition to the new development of physical metallurgy as its technical basis, controlled rolling and controlled cooling technology also benefits from new technology equipment, such as powerful rolling mills that can achieve low temperature and high pressure, ultra-compact layout rolling mills, ultra-rapid cooling ( UltraFastCooling), -on-line accelerated cooling (Super-OLAC) device, reducing and sizing machine equipment, etc. In the future, the development of controlled rolling and cooling technology will strongly rely on new technical equipment. This is an important feature of the development of controlled rolling and cooling technology, which needs attention.