Technology for producing 38CrMoAl steel by converter-LF (low frequency)-RH (rockwell hardness)-continuous casting
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A -LF-RH-, converter technology, applied in the field of 38CrMoAl production
Active Publication Date: 2013-07-03
JIANGSU LIHUAI IRON AND STEEL CO LTD +1
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[0010] The technical problem to be solved by the present invention is to provide a converter-LF-RH-continuous casting process for producing 38CrMoAl steel, which effectively solves the high Aluminum 38CrMoAl steel is prone to nodules when pouring, the billet yield is low, the number of continuous casting furnaces is low, the production cost is high, and the steel has problems such as point segregation
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Embodiment 1
[0031] 200mm×200mm cross-section continuous casting billet has been continuously poured up to 8 furnaces, and the pouring has been smooth without nodules. The specific process is as follows:
[0032] 1) The converter uses 92t of high-quality molten iron as the main raw material. The molten iron is treated with slag removal, and is matched with 6t of pig iron to form the main raw material for steelmaking. During the blowing process, the amount of lime, dolomite, ore, etc. should be adjusted as appropriate, and the oxidation slag should be poured out by shaking the furnace in the mid-stage of blowing, and the secondary slag will be formed; the steel tapping control C≥0.08%, to prevent peroxidation tapping;
[0033] 2) Ferromanganese and ferrochrome are added in the tapping process of the converter for alloying, and calcium carbide 200kg / furnace and Al cake 120kg / furnace are added, and the slag material is added in combination of 600kg / furnace lime and 600kg / furnace pre-melted ref...
Embodiment 2
[0040] φ380mm cross-section continuous casting round billet has more than 9 continuous casting furnaces, and the casting is smooth without nodules. The specific main process methods are as follows:
[0041] 1) Ferromanganese and ferrochromium are added to alloy during the tapping process of the converter, calcium carbide 2.0~3.0kg / t steel and Al cake 3kg / t steel are added, slag materials are 5.0~6.0kg / t steel lime and 6.0~7.0kg / t Combined addition of steel pre-melted refining slag;
[0042] 2) Randomly analyze the slag from one of the furnaces during the refining process. The binary basicity R2 of the slag in the early stage of refining is 10.95, and its chemical composition wt% is: CaO 60.88%, SiO 2 5.56%, MgO 3.29%, Al 2 o 3 30.25%, TiO 2 0.35%, S 1.31%, the rest is TFe(Mn); the binary alkalinity R2 of the final refining slag is 33.70, and its chemical composition wt% is: CaO 54.93%, SiO 2 1.63%, MgO 1.45%, Al 2 o 3 40.50%, TiO 2 0.08%, S 0.95%, the rest is TFe(...
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Abstract
The invention discloses a technology for producing 38CrMoAl steel by converter-LF (low frequency)-RH (rockwell hardness)-continuous casting. A 150mm*150mm of square billet, a 200mm*200mm of square billet, a phi380mm of round billet and a phi500mm of round billet are produced by the technologies such as primarily refining of a top-bottom combined blowing basic converter, refining of an LF refining furnace, degassing of an RH / VD vacuum furnace, and continuous casting of an arc continuous casting machine; the round steel of which the specification is phi13-phi250mm can be rolled, and can be forged or rolled again according to the requirement; and the technology is suitable for the requirements of different processing and manufacturing industries. By adopting the technology, the problems of casting difficulty, easy scaffolding and low bulk rate when the 38CrMoAl steel is produced by the continuous casting technology, and the production process and quality problems that the steel billet easily generates spot segregation and the like can be effectively solved; smooth continuous casting of over 8 furnaces is achieved; the problems of nodulation and stopping poring of a water gap are effectively solved; the steel material is excellent in quality; obvious spot segregation is not generated; and the production cost is greatly reduced.
Description
technical field [0001] The invention relates to the field of 38CrMoAl production, in particular to a process for producing 38CrMoAl by converter-LF-RH-continuous casting. Background technique [0002] 38CrMoAl steel is a high-strength nitrided steel with high surface hardness, wear resistance and fatigue strength. It is mainly used to manufacture key components of injection molding machines such as screws, locomotive spindles, imitation molds, cylinder liners, high-pressure valves, boring bars, worms, etc. At present, the largest domestic regional market for 38CrMoAl steel is East China, with a demand of about 300,000 tons per year. Prices have remained high. [0003] In the past two decades, electric furnace + mold casting technology has been basically used for production at home and abroad. This production process has obvious deficiencies such as low yield, poor surface quality and easy occurrence of spot segregation. "A 38CrMoAl Steel and Its Preparation Method" (Noti...
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