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Deoxidation control method for high-end bearing steel inclusions

A control method and technology of bearing steel, applied in the field of iron and steel smelting, to achieve the effects of not being easy to collide and grow, improving the stability of use, and stabilizing casting

Pending Publication Date: 2021-03-05
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese invention patent application CN201710095035.1 discloses a method of using silicon deoxidation to plasticize inclusions, which can prevent the nozzle from being blocked during the casting process, avoiding the falling off of the tundish nozzle blockage, and may play a very good role in improving macroscopic inclusions Help, but the C-type inclusions induced by silicon deoxidation alone will exceed the range specified by the bearing steel standard

Method used

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  • Deoxidation control method for high-end bearing steel inclusions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Example 1: This method is implemented in a 150-ton electric furnace equipped with LF and VD processes, and the smelted steel is high-carbon bearing steel with a carbon content of about 1%. The specific implementation process is as follows:

[0050] Step 1: After 150 tons of electric furnace smelting, the carbon content of the steel is controlled at 0.5%, and 150 tons of steel is started to be tapped. After the steel is tapped, ferrochrome or carburizer can be added. When the steel is tapped to one-third to half Silicon-manganese-aluminum composite deoxidation is carried out at all times, specifically adding 400kg of aluminum-iron with an aluminum content of 60%, 450kg of silicon-containing 75% of silicon, 380kg of manganese-containing ferromanganese, and adding 750kg of lime at the same time. After the steel tapping is completed, the ladle is transported to the slag removal station for automatic slag removal.

[0051] Step 2: When the ladle arrives at the LF refining s...

Embodiment 2

[0056] Example 2: This method is implemented in a 120-ton electric furnace equipped with LF and RH processes, and the smelted steel is high-carbon bearing steel with a carbon content of about 1%. The specific implementation process is as follows:

[0057] Step 1: After the 120-ton electric furnace is smelted, the carbon content of the steel is controlled at 0.15%, and 119 tons of steel are started to be tapped. After the steel is tapped, ferrochrome or recarburizer can be added. When the steel is tapped to one-third to half Silicon-manganese-aluminum compound deoxidation is carried out at all times, specifically adding 330kg of aluminum-iron with an aluminum content of 60%, 360kg of silicon-containing 75% of silicon, 325kg of manganese-containing ferromanganese, and adding 600kg of lime at the same time. After the steel tapping is completed, the ladle is transported to the slag removal station for automatic slag removal.

[0058] Step 2: When the ladle arrives at the LF refin...

Embodiment 3

[0063] Example 3: This method is implemented in a 150-ton electric furnace equipped with LF and VD processes, and the smelted steel is medium-carbon bearing steel with a carbon content of about 0.55%. The specific implementation process is as follows:

[0064] Step 1: After the 150-ton electric furnace is smelted, the carbon content of the steel is controlled at 0.2%, and 148 tons of steel are started to be tapped. After the steel is tapped, ferrochrome or recarburizer can be added. When the steel is tapped to one-third to half Silicon-manganese-aluminum compound deoxidation is carried out at all times, specifically adding 410kg of aluminum-iron with an aluminum content of 60%, 400kg of silicon-containing 75% of silicon, 400kg of manganese-containing 80% of ferromanganese, and adding 800kg of lime at the same time. After the steel tapping is completed, the ladle is transported to the slag removal station for automatic slag removal.

[0065] Step 2: When the ladle arrives at t...

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Abstract

The invention discloses a deoxidation control method for high-end bearing steel inclusions, which comprises the following steps: step 1, after initial molten steel is smelted by an electric furnace ora converter, silicon-manganese-aluminum alloy and lime are added in the tapping process to carry out composite deoxidation, and slagging off is conducted; Step 2, an LF refining stage is entered, ferrosilicon and ferromanganese are added to deoxidize and realize alloying of silicon and manganese, and a composite slag former, lime and a slag surface deoxidizer are added in the deoxidizing processto prepare medium-alkalinity slag with alkalinity of 2-2.5; 3, vacuum treatment is conducted; 4, silicon-magnesium-calcium wires are fed for final deoxidation, wherein the magnesium feeding amount is0.07-1.5 kg / t, and the calcium feeding amount is 0.03-0.07 kg / t; and after bottom blowing soft stirring treatment, the content of deoxidation related elements in molten steel is as follows: the content of Al is 8-30 ppm, the content of Mg is 2-15 ppm, the content of S is 10-100 ppm, and the content of Ca is 0-3 ppm; and step 5, a casting area is entered for casting. By means of the method, microscopic Ds inclusions and macroscopic inclusions in the bearing steel can be well controlled, and the condition that C-type inclusions do not exceed the standard, and therefore the stability of the bearing steel in the using process is comprehensively improved.

Description

technical field [0001] The invention relates to a steel smelting method, in particular to a method for controlling deoxidation of high-end bearing steel inclusions. Background technique [0002] Bearing steel is widely used in automobiles, trains, aviation and machinery industries. It is a key power transmission basic part. With the development of society and the increasing demand of modern industry, bearing steel needs to have the characteristics of high speed, long life and high reliability. , while hard point inclusions (also known as Ds inclusions) and macroscopic inclusions will affect its fatigue life, thereby reducing the stability of the bearing during operation. [0003] At present, the deoxidation of bearing steel in the existing steelmaking process generally adopts the method of aluminum deoxidation, and at the same time, the calcium content in the steel is strictly controlled to prevent the formation of calcium aluminate inclusions with low melting point and easy...

Claims

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Application Information

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IPC IPC(8): C21C7/06C21C7/10C21C7/00
CPCC21C7/06C21C7/10C21C7/0006
Inventor 徐迎铁孟庆玉刘湘江陈志平李成斌郑宏光
Owner BAOSHAN IRON & STEEL CO LTD
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