Research On Productive Technic Of AlMnSi Series Manganese Alloys

Manganese industry is the pillar cornerstone industry at Chengkou, Chongqing, China. With the development of society, medium and small enterprises become more and more lack of market competitiveness because their products are inferior and consume high energy. Thereby, it is necessary to research and develop more competitive new type of manganese alloy imminently.The goal of this topic is to research and develop new type manganese alloys which is manganese-based and include Al:12～18% or 30～40%;Ti≥3%;V≥2%. Considering the melting point, density differences, low solid solution, high rate of burning loss and low redemptory of the element such as manganese,silicon,aluminum,titanium and vanadium , the difficulties of adjusting organizational structure and so on, this paper focus on solving the alloys pulverization, segregation and the difficulties of technical problems. These problems were solved by choosing an effective solution , such as equipent selection, controlling melting and casting process, storage areas.The primary equipment is single-phase IF induction furnace. Main parameters are power, 5000W, frequency, 1000Hz, capacity, 10kg. The following conclusions by a lot of experiments are: (1) This feeding process which is to take"a small quality of raw Al material→other materials→remaining Al material"can improve the yield of aluminum intake, and reduce the melting time.(2) The whole process temperature should be controlled between 1500~1700℃, warming speed be controlled between 130 to 150℃/min; the melting time of Silicon-manganese alloys material be controlled between 15～17min; the melting time of manganese ore material be controlled between 20～25 min. (3) Basicity control: In silicon-manganese alloys as the main raw materials of melting experiments, the ideal basicity is between 3～4 to reduce the phosphorus; In manganese ore as the main materials of melting process, the ideal basicity is between 0.6～0.8 to improve manganese and silicon retraction.(4) we select a powdered coverage include KCl,NaCl and cryolite with refining capacity. This coverage reduce the alloying elements burning, oxide block and air hole.(5) Selecting flat bronze with rapid heat transfer in casting process. Casting start about 2 minutes after smelting, keeping the gate full and a smooth and relative flow. Thus, the composition of the alloys will be more homogeneous. (6) To extend the preservation of the alloys, dry and sealed storage should be selected. Through alloys component analysis, metallographic phase testing and preservation period observation, the alloys has homogeneous composition, dense structure and long storage term. The author achieved the expected goals.