Smelting method for vulcanization easy cutting plastic mold steel

A technology of plastic mold steel and smelting method, which is applied in the field of smelting, can solve the problems that the steel plate flaw detection level cannot meet the requirements, the purity of molten steel cannot be guaranteed, and the inclusions cannot be removed to the maximum extent, so as to achieve performance improvement, prevention of secondary oxidation, and various item performance improvement

Inactive Publication Date: 2009-02-18
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main disadvantages of this smelting method are: due to the weak adsorption capacity of steel slag, and the recovery rate of sulfur must be ensured, the inclusions in the molten steel cannot be removed to the maximum, the purity of the molten steel cannot be guaranteed, and it is easy to cause the flaw detection level of the steel plate Failure to meet the requirements will have a certain impact on various properties of the steel plate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1: The ingredients of the electric furnace are 45 tons of hot molten iron + 8 tons of pig iron + 27 tons of high-quality steel scrap + 15 tons of sponge iron. The smelting cycle of the electric furnace is 48 minutes. Tapping [C]: 0.08%, [P]: 0.007%, tapping The temperature is 1618°C, there is no oxidation slag in the ladle when the steel is tapped, the argon blowing is normal, and it is sent to the LF furnace for refining. During the refining process, the slag is deoxidized. The refining cycle is 55 minutes, and the white slag is kept for 40 minutes. The sulfur content in the molten steel is controlled to 0.003 %, slag removal to adjust the weight percentage of steel slag in molten steel to 0.8%; then send it into a vacuum furnace, feed aluminum wire into molten steel, the weight of the fed aluminum wire is 0.08% of the weight of molten steel, and then add steel slag , adjust the percentage by weight of steel slag in molten steel to be 1.5%, then keep it under th...

Embodiment 2

[0013] Example 2: The ingredients of the electric furnace are 45 tons of hot molten iron + 8 tons of pig iron + 27 tons of high-quality steel scrap + 15 tons of sponge iron. The smelting cycle of the electric furnace is 48 minutes. The temperature is 1618°C, there is no oxidation slag in the ladle when the steel is tapped, the argon blowing is normal, and it is sent to the LF furnace for refining. During the refining process, the slag is deoxidized, the refining cycle is 55 minutes, the white slag is kept for 40 minutes, and the sulfur content in the molten steel is controlled to 0.005 %, slag removal to adjust the weight percentage of steel slag in molten steel to 1%; then send it into the vacuum furnace, feed aluminum wire into the molten steel, the weight of the fed aluminum wire is 0.09% of the weight of molten steel, and then add steel slag , adjust the percentage by weight of steel slag in molten steel to be 1.7%, then keep it under a pressure of 65Pa for 20 minutes, then...

Embodiment 3

[0015] Example 3: The ingredients of the electric furnace are 45 tons of hot metal + 8 tons of pig iron + 27 tons of high-quality steel scrap + 15 tons of sponge iron. The smelting cycle of the electric furnace is 48 minutes. Tapping [C]: 0.08%, [P]: 0.007%, tapping The temperature is 1618°C, there is no oxidation slag in the ladle when the steel is tapped, the argon blowing is normal, and it is sent to the LF furnace for refining. During the refining process, the slag is deoxidized. The refining cycle is 55 minutes, and the white slag is kept for 40 minutes. %, slag removal to adjust the weight percentage of steel slag in molten steel to 1.2%; then send it into the vacuum furnace, feed aluminum wire into the molten steel, the weight of the fed aluminum wire is 0.10% of the weight of molten steel, and then add steel slag , adjust the percentage by weight of steel slag in molten steel to be 2%, then keep it under the pressure of 70Pa for 15 minutes, then release the vacuum, feed...

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PUM

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Abstract

The invention provides a smelting method for plastic die steel which is added with sulphur and easily cut; the materials after being smelted by an electric furnace is fed into a refining process; the content of the sulphur in the molten steel is controlled less than 0.005 percent during the refining process; the weight percentage of the steel slag in the molten steel is adjusted between 0.8 and 1.2 percent through slagging off; then the molten steel is fed into a vacuum furnace; an aluminum wire is fed into the molten steel; the weight of the fed aluminum wire is 0.08 to 0.10 percent of the weight of the molten steel; then the steel slag is added; the weight percentage of the steel slag in the molten steel is adjusted between 1.5 to 2 percent; then the molten steel is maintained for 15 to 30 minutes under the pressure of 60 to 70Pa; then the vacuum is released; a sulfurous iron wires are fed in and a calcium silicon block is added to finish smelting. In the invention, the occluded foreignsubstance in the molten steel can be mostly removed; the purify of the molten steel is improved to a large extent; the molten steel smelt after the invention can obtain the plastic die steel which is added with sulphur and easily cut through casting; the inspection grade of the die steel accords with requirments through detection; each property is further improved.

Description

technical field [0001] The invention belongs to the technical field of smelting, and relates to a smelting method of vulcanized free-cutting plastic mold steel. Background technique [0002] Free-cutting steel is widely used in many fields such as household appliances and instrumentation industries due to its good machinability, high surface finish, and high dimensional accuracy. The free-cutting steels produced in large quantities at this stage are mainly sulfur-containing free-cutting steels. The sulfur in the sulfur-containing free-cutting steel forms manganese sulfide inclusions with manganese and iron in the steel. This type of spindle-shaped sulfide can interrupt the continuity of the matrix metal, and promote chip breaking to form small-radius short coils that are easy to remove during cutting, reducing The contact area between the tool and the chip breaker; it can also act as internal lubrication, reduce friction, and prevent the chip breaker from adhering to the cut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06C21C7/10
Inventor 任荣夏保卫林建农陈剑武
Owner WUYANG IRON & STEEL
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