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Free-machining pinion steel smelting method and free-machining pinion steel

A gear steel and easy-cutting technology, which is applied in the field of smelting free-cutting gear steel, can solve the problems of decreased purity of molten steel, generation of inclusions, increased production costs, etc., and achieve the effect of reducing production costs

Active Publication Date: 2013-09-04
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this measure will bring difficulties to the smelting process, adding sulfur alloy or sulfur-containing cored wire will increase production costs, and will lead to a decrease in the purity of molten steel and produce inclusions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Using vanadium-extracted semi-steel as raw material, the mass percentages of its main components are: C: 3.50%, Mn: 0.04%, Cr: 0.04%, P: 0.04%, S: 0.07%, V: 0.035%, Fe: 96.27%, and the balance is impurities.

[0023] The semi-steel is blended into the compound blowing steelmaking converter for blowing, and a 536 oxygen lance is used for oxygen supply, slagging, dephosphorization and decarburization. At the same time as the oxygen blowing is started, the steelmaking slag is carried out and all the slagging materials are added within 6 minutes after the oxygen blowing is started. Slag-making materials include active lime, composite slagging agent, high-magnesium lime and steelmaking sludge balls, and the addition amounts are 31Kg / t semi-steel, 20Kg / t semi-steel, 18Kg / t semi-steel and 2.7Kg / t semi-steel . Wherein the mass percent of each component of active lime is: CaO: 96%, SiO 2 : 0.391%, MgO: 3.25%, and the balance is impurities; wherein the mass percentage of each ...

Embodiment 2

[0028] Smelting is carried out using the method of Example 1, wherein the mass percentages of the semi-steel used for primary smelting are: C: 3.8%, Mn: 0.02%, Cr: 0.045%, P: 0.05%, S: 0.085%, V: 0.028%, Fe: 95.97%, and the balance is impurities.

[0029] The semi-steel is blended into the compound blowing steelmaking converter for blowing, and a 536 oxygen lance is used for oxygen supply, slagging, dephosphorization and decarburization. At the same time as the oxygen blowing is started, the steelmaking slag is carried out and all the slagging materials are added within 6 minutes after the oxygen blowing is started. The slagging materials include active lime, composite slagging agent, high-magnesium lime and steelmaking sludge balls, and the addition amounts are 36Kg / t semi-steel, 21Kg / t semi-steel, 19Kg / t semi-steel and 2.9Kg / t semi-steel . When the oxygen supply time is 900 seconds, the oxygen supply is stopped and the oxygen lance is raised. The final basicity of the conv...

Embodiment 3

[0034] Smelting is carried out using the method of Example 1, wherein the mass percentages of the semi-steel used for primary smelting are: C: 3.70%, Mn: 0.07%, Cr: 0.06%, P: 0.07%, S: 0.12%, V: 0.031%, Fe: 95.94%, and the balance is impurities.

[0035] The semi-steel is blended into the compound blowing steelmaking converter for blowing, and a 536 oxygen lance is used for oxygen supply, slagging, dephosphorization and decarburization. At the same time as the oxygen blowing is started, the steelmaking slag is carried out and all the slagging materials are added within 6 minutes after the oxygen blowing is started. Slag-making materials include active lime, composite slagging agent, high-magnesium lime and steelmaking sludge balls, and the addition amounts are 38Kg / t semi-steel, 20Kg / t semi-steel, 19Kg / t semi-steel and 2.5Kg / t semi-steel . When the oxygen supply time is 920 seconds, the oxygen supply is stopped and the oxygen lance is raised. The final basicity of the conver...

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Abstract

The invention provides a free-machining pinion steel smelting method. The method comprises the following steps of: performing primary smelting to molten iron in a converter; tapping the molten steel which is subjected to primary smelting into a steel ladle, adding an aluminum-iron deoxidizer into the steel ladle in a process that tapping is performed to 20 to 30 percent, and adding the first batch of refining slag into the steel ladle in a process that tapping is performed to between 40 and 60 percent to realize that the S content in the molten steel after tapping is 0.05 to 0.08 weight percent; performing LF (ladle furnace) steel ladle refining to the steel ladle, and adding the second batch of refining slag and deoxidized aluminum particles in an LF steel ladle refining process to realize that the S content in the molten steel which is subjected to LF steel ladle refining is between 0.02 and 0.025 weight percent; and performing RH (ruhrstahl-hausen) vacuum refining to the molten steel which is subjected to LF steel ladle refining. According to the technical scheme of the invention, the sulfur content in the molten iron of the raw material is sufficiently utilized, and the addition amounts of refining slag and deoxidizer are controlled according to changes of sulfur content in the smelting process, so that the required sulfur content is ensured, and purity and impurities of the molten steel are controlled.

Description

technical field [0001] The invention relates to a method for smelting free-cutting gear steel and the free-cutting gear steel. Background technique [0002] Gear steel is widely used in automobile and motorcycle industry. Due to the large alloy content, the hardness of the gear steel is relatively high, which brings certain difficulties to the production and processing of the gear. Therefore, at present, gear steels are required to have good machinability while ensuring performance. Therefore, it is necessary to control the range of sulfur and T[O], that is, it is necessary to maintain sulfur and deoxidize when smelting free-cutting gear steel, and it is necessary to take measures such as adding sulfur alloy or feeding sulfur-containing cored wire during the refining process to compensate Insufficient sulfur content. However, this measure will bring difficulties to the smelting process, and the added sulfur alloy or sulfur-containing cored wire will increase the productio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04C21C7/00C22C38/18
Inventor 陈天明陈亮曾建华陈永杨素波李桂军杨森祥周伟李清春张彦恒
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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