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Perfect skills for bearing steel exercise technology

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The perfect skills of bearing steel exercise technology (bearing skills):
For example: GCr15 GCr15SiMn GCr20SiMn GCr4 GCr15V 55SiMo5VA 95Cr18 ЭИ 347 et al. The Dnepr Special Steel Plant, which uses bearing steel as a traditional type of product, develops various types of bearing steel processes for electric arc furnace operation, electroslag remelting and vacuum arc remelting.
Φ 8 13mm hot rolled wire rod and φ 2 12.5mm cold rolled wire rod; bearing steel specifications include φ 8 220mm hot rolled bar and φ 2 40mm precision forged cold drawn sheet. Appearance special finishing bar. Follow the customer The increase in demand and the development of new processes and equipment; the production process of bearing steel is perfected. The customer firstly does not use electroslag remelting and vacuum arc remelting exercise steel pollution, non-metallic doping content and the use of ГОСТ 801-78 After the oxygen content puts forward the demand. The process of continuous training is completed in stages; the progress is not selected by the special {TodayHot} special metallurgy method to exercise the purity of molten steel.
Pristine and steel are placed into a high alkalinity slag ladle; the first process consists of tempering molten steel in a 60t alkaline electric arc furnace. The molten steel is cast into a 2. 8 3 . 6t ingot. Steel has oxides; especially the characteristics of high point and non-metallic doping; the oxygen content is at (25 40 ppm level).
In order to improve the purity and reduced oxygen content of steel; 70 80 times. The company has experimented with the use of CaO-A l2O3 liquid composition slag to dispose of molten steel; and the selection of vacuum slag disposal equipment. This disposal method ensures the reduction of oxides and vulcanization. The content of impurities is reduced; together the oxygen content is reduced (15 25 ppm, but the point contamination of molten steel is high; the process is not used.
Especially when the production section is < 40 steel; the second method to improve the production process of bearing steel is to use lime and fluorite solid slag data to exercise and dispose of molten steel. This process can improve the yield of products. However, the oxygen content is still high. (Up to 30ppm does not meet the requirements of ГОСТ 801-78 (≤ 20ppm 80. The external treatment method selected in the era has improved the purity of steel and reduced the gas content including oxygen. In 1991, the ladle furnace depicted by the factory was used; In 1996, Danieli's ladle furnace was selected.
Decrease the content of oxides, sulfides and punctate impurities; use the solid slag data to dispose of the molten steel and match the high alkalinity slag in the ladle furnace to improve the purity of the molten steel. Together, the oxygen content in the steel is uniformly reduced to 18ppm.
Can reach the world market according to ASTM and DIN specifications to identify non-metallic doping pollution and oxygen content requirements. Completed the following induction work: clear the demand for semi-finished products, experimented with a different tapping plan, made with {HotTag} solid state The slag data is used for deoxidation of molten steel and tapping, and the new slag process of ladle slag and ladle furnace is proposed to improve the deoxidation process of molten steel in the process of ladle furnace and vacuum equipment disposal. The “fine” argon blowing process of molten steel is taken as a key factor, casting In the process of blowing argon to keep the steel flow, draw up the method of taking oxygen from the molten steel, and improve the determination of oxygen content. In 1999, after the application of Mannesmann 0? Demark company's ladle vacuum equipment.
The other part is high alumina clay casting lining. Inside the ladle. When the steel is put into the package, participate in the deoxidizer, recarburizer, alloying elements and solid slag data. At this moment, ensure the deoxidation and essence of the molten steel; in order to desulfurize (the desulfurization rate is 60% and removed) Non-metallic noisy. After the slag is filled with slag, a new high alkalinity slag is formed in the ladle furnace; the deoxidation essence outside the molten steel furnace reaches the regular chemical composition and temperature. The whole argon blowing time of the molten steel through the ladle furnace bottom is 40 50 min, perfected The process consists of training semi-finished products in a 60t alkaline electric arc furnace, after steel is released into the oxidation period or after a short time.) Mgo-based main lining or composite lining (the slag zone is composed of periclase carbon bricks. The process of treating molten steel with high alkalinity slag) In order to ensure the refined steel outside the furnace; desulfurization, deoxidation and removal of non-metallic noisy. The molten steel in the ladle furnace is treated with a sulfur content of 0.005%, and the oxygen content is 12ppm. The slag is floated and then vacuum treated; to ensure the slag layer inside the package. The thickness is 60 70mm high vacuum (100Pa vacuum treatment 10 15min together with molten steel blowing argon.
During the vacuum treatment process, the molten steel continues to remove harmful impurities and gases. The molten steel desulfurization rate is 50 80% at the moment. The minimum sulfur content is 0. 003%. Hydrogen at vacuum disposal (uniform 2ppm nitrogen (evenly 75ppm and oxygen (evenly 0. 2ppm) Drop. The oxygen sample is taken from the molten steel after vacuum treatment.
That is, according to the former Soviet Union ГОСТ 801-78 American Standard ASTME-45-95 German DIN Specification 50602-85 to identify the degree of pollution; the entire oxygen content determination method developed can eliminate the error associated with the surface oxidation of the sample when the sample is produced. The same method. Perfect exercise, furnace treatment and casting process greatly improve the purity of molten steel. According to the DIN standard, the purity of the molten steel is high (standard ≤ 12 K3 = 0 ≤ 13 K4 = 0) 12 according to ГОСТ 801-78 Guardian time; about 2% of the furnace violations start testing specifications; according to electric arc furnace - solid slag data - ladle furnace process; 19% heat violations. According to ASTMME standards; Compared with non-vacuum treated steel, 73% sulfide, 65% oxide and 85% coarse point noisy; vacuum steel has 100% fine doped qualified heat and 93% coarse oxide doped qualified heat.
According to the identification of 300 500 test sites, all the noisy D method; according to ASTM E-45 identification. The most accurate explanation of the vacuum treatment of molten steel quality problems. It can be seen from the table; all types of fine and noisy specifications are larger (5 140 times) The coarse and noisy is close to the zero value of the demand. The R&D process can be used to supply foreign users with vacuum-treated steel with a strict requirement for oxygen content (up to 12ppm and non-metallic impurities).
The Dnepr Special Steel Plant has developed a high-quality bearing steel production process; thus, this process ensures the clean steel outside the furnace compared to the non-vacuum treatment of molten steel; desulfurization, dehydrogenation, deoxidation and removal of non-metallic impurities.

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