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  Globally, construction activity continues to recover from the COVID-19 lockdown in 2021, with steel demand up 3.4% year-on-year, despite a contraction in construction activity in China. In many countries and regions around the world, the impetus for this recovery comes from infrastructure investment. The World Steel Association believes that in the next few years, infrastructure investment and energy transition investment are likely to continue to drive the growth of steel demand in the construction industry. However, the construction industry is also facing some headwinds from high costs and interest rates. In addition, in the second half of 2021, bottlenecks in the automotive industry supply chain hindered the recovery of steel demand, and the recovery of the global automotive industry in 2021 was disappointing. Steel demand in the electric vehicle market has seen rapid growth during the COVID-19 pandemic, despite a slump in global auto production. In 2021, global...

  The recovery of steel demand in developing economies (excluding China) faces more challenges as the impact of the COVID-19 pandemic persists and inflation, and as a result, many emerging economies enter a tightening monetary cycle. Steel demand in developing economies (excluding China) increased by 10.7% in 2021 after falling by 7.7% in 2020, a figure slightly higher than the World Steel Association forecast. In 2022 and 2023, developing economies (excluding China) will continue to face challenges posed by the deteriorating external environment, the conflict between Russia and Ukraine, and the tightening of monetary policy in the United States, which will lead to developing economies (excluding China) steel Demand has grown at a low speed in the past two years, and is expected to grow by 0.5% and 4.5% respectively. Wanhao is a manufacturer who is specialized in designing various kinds of furnace and making refractory products for electric furnace, ladle, tundish, bla...

  During the casting process, powder or granular slag, called mold slag, should be continuously added to the molten steel surface of the mold. The role of casting mold powder has the following aspects: (1) Heat insulation to prevent heat dissipation; (2) Isolate the air to prevent the oxygen in the air from entering the molten steel for secondary oxidation, which affects the quality of the steel;? (3) Absorb and dissolve from the molten steel and float up inclusions at the interface of the steel slag to purify the molten steel; (4) There is a layer of slag film between the mold wall and the solidification shell to lubricate, reduce the drawing resistance, and prevent the bonding between the solidification shell and the copper plate; (5) Fill the shell The air gap between the mold and the mold improves the heat transfer of the mold. A good mold slag should be able to give full play to the above five aspects, so as to improve the surface quality of the slab and ensu...

  1. Properties of chrome corundum The main components of chromium corundum are Al2O3 and Cr2O3, which form a continuous solid solution. According to the Al2O3-Cr2O3 binary phase diagram, adding Cr2O3 to the Al2O3 single-phase material not only does not reduce the refractoriness of the material, but the refractoriness increases with the content of Cr2O3 increase and rise. When Cr2O3 is added to corundum material, as the temperature increases, Al2O3 and Cr2O3 gradually form a solid solution, so that the corundum particles and the matrix are closely combined, and a ring-shaped solid solution zone is further formed on the surface of the corundum particles, so that the particles and particles of the material can be formed at high temperature. In between, the particles and the fine powder are closely combined, and the combined phase is an aluminum-chromium solid solution phase with a high melting point, and the bond strength is maintained even at high temperatures, so the...

  (1) Ensure that there is no deformation in the sliding mechanism of the continuous casting sizing nozzle , there is no foreign matter on the sliding stroke of the sizing nozzle, and the gap between the sizing nozzles is less than or equal to 0.3mm. (2) The size of the zirconium sizing nozzle is reasonably designed, there is no damage and cracks before use, and the board surface is flat without unevenness. (3) The production rhythm is stable, the quality of molten steel is qualified, and there is no phenomenon of high and low temperature and molten steel interception. (4) The personnel for replacing the sizing nozzle are skilled, and there should be no accidental burning or diameter expansion caused by human factors. Wanhao is a manufacturer who is specialized in designing various kinds of furnace and making refractory products for electric furnace, ladle, tundish, blast furnace, AOD furnace, IF furnace, etc. Article Source: How to improve the spreadability of ...