45 # seamless steel tube RH desulfurization and liquid steel purification technology. With the need of ultra-low carbon steel production, the function of RH equipment is constantly developing and improving. Starting from the initial single-stage degassing of molten steel, it is gradually developed to meet the needs of deep decarbonization, degassing, chemical heating, molten steel purification, alloying adjustment and so on. Functional vacuum refining unit can produce ultra-low carbon steel and products with carbon content less than 20 *10-4% and ultra-low carbon content up to 8 *10-4%. With the continuous improvement of sulphur content in non-oriented silicon steel, Anshan Iron and Steel has developed a new technology of RH-TB desulfurization, which is to control the aluminium content in steel to 0.25%~0.3% after RH-decarburization, deoxidation and alloying. TB. Adding desulfurizer to desulfurize molten steel, the treatment time is 7min~10min, the dosage of desulfurizer is 8kg/t~10kg/t, and the gas flow rate is 0.6m3/year. The company upholds the principle of "high quality and high efficiency". "Yu" business philosophy and service purpose for the majority of customers to provide quality and cheap products and after-sales service, won the support and praise of old and new customers. Here, all employees of the company will serve the customers with good reputation, strong strength, high quality products and low prices. I would like to express my heartfelt thanks to the old and new friends and customers who have always cared about, supported and helped our company. Sincerely hope to establish long-term cooperative relations with them, mutual benefit and common development. H.t~0.7m3/h.t. The desulfurization rate is controlled at 50%~60%.


Scanning electron microscopy (SEM) was used to analyze the composition changes of inclusions during refining. After Al deoxidation, the inclusions in molten steel are mainly A12O3 inclusions. The content of MgO and CaO in inclusions increases gradually with the addition of desulfurizer. Inclusions gradually change into MgOA12O3 spinel inclusions and CaO-MgO-A12O3 composite inclusions. At the end of RH treatment, the inclusion composition is located in the low melting point region of the phase diagram.


Under RH cycle conditions, alloy pipes of various specifications and materials run all year round. High quality products are 45 # steel pipe, 45 # seamless steel pipe, 45 # steel pipe, 10 # steel pipe and 35 # steel pipe. The company has established long-term friendly cooperative relations with Tianjin, Baosteel, Smelting Steel, Baotou Steel, Chengdu and other major steel mills, and has become the sales agent of many steel mills. Thousands of steel pipes of various sizes, including: 10 #, 20 #, 35 #, 45 #, 16mn, 27sim, 15CrMoG, 12Cr1MoVG, 10CrMo910 (P22) 1Cr5Mo (P5) 1Cr9Mo (P9) and imported materials: P11, P12, P22, P5, P9, P91, T91. Strong professionalism, strong technical force, rich production experience, good reputation, deeply trusted by the majority of users. Our business policy is: to survive by quality, to develop by products, to cooperate by reputation, to win customers by service. More than 6,000 customers have grown together in various fields of the national economy, such as machinery, chemical industry, power plants, aerospace, public utilities, shipbuilding, oil fields and so on. The content of Mg and Ca in molten steel increases gradually, and finally CaO-MgO-A12O3 low melting point composite inclusion is formed. When the content of [Mg] in molten steel reaches above 0.0001%, spinel inclusions can be formed. By sampling analysis, after adding desulfurizer, the content of [Mg] in molten steel can easily reach above 0.0001%. Similarly, with the increase of [Ca] in molten steel, [Ca] reacts with Al_2O_3 in inclusions, resulting in the gradual increase of CaO in inclusions. After A12O3 inclusions are converted into low melting point inclusions, they can grow through droplet condensation, which is much faster than solid inclusions. In addition, the adsorptive capacity of ladle top slag to liquid inclusions is much greater than that of solid inclusions, which is conducive to the removal of inclusions.