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Perfection of bearing steel exercise process (2)
Source: China Bearing Network Time: 2014-03-16
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The improved process consists of training the semi-finished product in a 60t alkaline electric arc furnace, and releasing the steel to the (go-oxidation period or short-term essence) Mgo-based main lining or composite lining (the slag zone is composed of pericl carbon brick; the rest is high) Aluminium clay casting lining) Inside the ladle. When taking steel, take part in the deoxidizer, recarburizer, alloying elements and solid slag data. At this moment, ensure the deoxidation and essence of molten steel; in order to desulfurize (desulfurization rate up to 60%) and remove non-metallic noisy After the slag is coated 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 bottom of the ladle furnace is 40 to 50 min, and the high alkalinity slag is used. During the process of treating molten steel, the molten steel outside the furnace is ensured; the 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 an oxygen content of 12 ppm. The inner slag is floated and then vacuum treated; The thickness of the slag layer in the bag is 60-70mm. The vacuum is treated for 10~15min under high vacuum (100Pa) and the molten steel is argon.
During the vacuum treatment process, the molten steel is continuously removed to remove harmful impurities and gases. The desulfurization rate of molten steel at this moment is 50-80%; the minimum sulfur content is 0.0003%. Hydrogen (even 2ppm), nitrogen (evenly 75ppm) and oxygen during vacuum disposal ( Uniform 0. 2ppm) content decreased significantly. Oxygen samples were taken from molten steel after vacuum treatment.
The whole oxygen content determination method developed by the company can eliminate the error associated with the oxidation of the sample surface when the sample is produced. The method is different; that is, according to the former Soviet Union ГОСТ801-78, the American standard ASTME-45-95, the German DIN specification 50602-85 When identifying the degree of pollution; 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 (the specification is ≤12 when K3=0; when the specification is ≤13) =0.12). According to ГОСТ801-78 defensive time; about 2% of the furnace violations start testing specifications; according to the electric arc furnace - solid slag data - ladle furnace process; 19% furnace violations. According to ASTME specifications Punctuality; compared to 73% sulfide, 65% oxide and 85% coarse point noisy of non-vacuum treated steel rolled; vacuum steel with 100% fine doped qualified heat and 93% coarse oxide doped qualified Heater.
According to the identification of ASTME-45; according to the identification of 300 to 500 test sites, the full D method; the most accurate explanation of the vacuum treatment of molten steel quality problems. It can be seen from the table; all types of fine noisy specifications are larger (5 ~140 times); and the coarse noisy is close to the zero value of the demand. The R&D process can be used to supply foreign customers with vacuum-treated steel with strict oxygen content (up to 12ppm) and non-metallic impurities.
Therefore, the Dnepr Special Steel Plant has developed a high-quality bearing steel production process; this process ensures the clean water 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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