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Diffusion and fusion method for ferromolybdenum and application thereof

A ferromolybdenum and melting technology, applied in the field of cast iron smelting, can solve the problems of inability to arrange production at the same time, increase production costs, unfavorable production arrangements, etc., and achieve the effects of avoiding isolation and scrapping, rapid melting, and saving raw materials.

Inactive Publication Date: 2011-12-21
JIANGLING MOTORS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that it needs to be heated to above 1600°C and the temperature of the furnace is high; each production must add molybdenum element according to the molten metal of the whole furnace. During the production process, especially when new products are trial-produced in small batches, The remaining molten iron needs to be isolated and scrapped, resulting in waste of raw materials and increased production costs; during production scheduling, molybdenum-containing and molybdenum-free products cannot be scheduled for production at the same time, which is not conducive to production arrangements

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  • Diffusion and fusion method for ferromolybdenum and application thereof

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Experimental program
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Effect test

Embodiment 1

[0018] The ferromolybdenum diffusion melting method comprises the following steps:

[0019] 1. Pretreat ferromolybdenum (FeMo55-A) to make the particle size 3-10mm, and then weigh out the corresponding weight of ferromolybdenum according to the molybdenum content requirements of silicon-molybdenum ductile iron;

[0020] 2. Use 5T / H cupola + 3T electric furnace to smelt molten iron, the weight percentage of Si is 3.0%, and the furnace temperature is 1530-1580°C;

[0021] 3. Use a 400Kg ladle, and add 1.4% by weight nodulizer (Mg5.0-6.0%, RE2.0-2.6%, Si43-46%), 0.6% by weight of inoculants (Si70-74%, Ca1.0-2.5%, Al1.0-2.5%, Ba0.5-2.5%) and 1.5% by weight of ferromolybdenum, covering ferromolybdenum on on the inner surface of the ladle;

[0022] 4. The molten iron is subjected to flushing spheroidization treatment, and the slag is removed before pouring. During pouring, 0.1% (weight percentage) secondary inoculation with flow (Si 65-75%, Ca1.0%-2.5%, Al1. 0%~2.5%, Ba0.5%~2.5%)...

Embodiment 2

[0024] The ferromolybdenum diffusion melting method comprises the following steps:

[0025] 1. Pretreat ferromolybdenum (FeMo55-A) to make the particle size 3-10mm, and then weigh out the corresponding weight of ferromolybdenum according to the molybdenum content requirements of silicon-molybdenum ductile iron;

[0026] 2. Using 5T / H cupola + 3T electric furnace to smelt molten iron, the weight percentage of Si is: 1.6% (to facilitate the switch between the production of molybdenum-containing ductile iron and molybdenum-free ductile iron products), and the furnace temperature is 1530-1580°C;

[0027] 3. Use a 400Kg ladle, and add 1.4% by weight nodulizer (Mg5.0-6.0%, RE2.0-2.6%, Si43-46%), 2.6% by weight of inoculants (Si70-74%, Ca1.0-2.5%, Al1.0-2.5%, Ba0.5-2.5%) and 1.6% by weight of ferromolybdenum, covering ferromolybdenum on on the inner surface of the ladle;

[0028] 4. The molten iron is subjected to spheroidization treatment by flushing method, the slag is removed an...

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Abstract

The invention discloses a diffusion and fusion method for ferromolybdenum and an application thereof, relating to a silicon-molybdenum nodular cast iron smelting technology. The method comprises the following steps: (1) pretreating the ferromolybdenum so as to enable the granularity thereof to be 3-10mm; (2) tapping the molten iron at the tapping temperature of 1530 DEG C-1580 DEG C; (3) while filling the concave pit of a casting ladle, sequentially adding nodulizer, inoculator and the pretreated ferromolybdenum layer by layer so as to enable the ferromolybdenum to be covered on the surface; and (4) discharging the molten iron, carrying out pour-over spheroidization, pouring after completely scratching slag away, and carrying out secondary stream inoculation while pouring. The method can be used for producing cast-state silicon-molybdenum nodular cast iron. The invention has the following beneficial effects: the temperature for smelting in a furnace is low; the residual molten iron inthe furnace can be prevented from quarantined scrapping, and the raw materials are saved; and the method of the invention is favorable for rapid switchover of (molybdenum-containing nodular cast ironand molybdenum-free nodular cast iron) production scheduling, thereby greatly lowering the production cost.

Description

technical field [0001] The invention relates to the technical field of cast iron smelting, in particular to the smelting of silicon-molybdenum nodular cast iron. Background technique [0002] Silicon-molybdenum ductile iron has high strength, good plasticity, strong oxidation resistance, corrosion resistance, and high temperature creep resistance, and has been widely used in the field of machinery manufacturing. [0003] In the traditional cast iron smelting process, because ferromolybdenum has a high melting point, the method of adding molybdenum element is usually to place the alloy molybdenum at the bottom of the charge, and heat it with the charge until it melts, which is called the melting method. The disadvantage of this method is that it needs to be heated to above 1600°C and the temperature of the furnace is high; each production must add molybdenum element according to the molten metal of the whole furnace. During the production process, especially when new products...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/08C22C33/10C22C37/04
Inventor 熊贵根邹卫徐万里王瑞平郭之萍万修根杨湘杰雷飞来刘勇王宁唐辉高世通
Owner JIANGLING MOTORS
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