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Preparation method, secondary refining method and refining agent of PMHSS (powder metallurgy high speed steel)

A powder metallurgy and refining agent technology, applied in the refining agent for powder metallurgy high-speed steel out-of-furnace refining and the preparation of powder metallurgy high-speed steel, can solve unfavorable bottom pouring atomization process temperature control, weak deoxidation and desulfurization ability, and removal of inclusions Weak capacity, etc., to ensure the effect of removing inclusions, optimizing the slag resistance, and increasing the viscosity of the slag system

Active Publication Date: 2013-09-04
HEYE SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, in powder metallurgy high-speed steel, the main purpose of slag washing is to remove inclusions. If only one slag system is used to refine molten steel once, either the deoxidation and desulfurization ability is weak, or the ability to remove inclusions is weak.
However, according to the existing slag system, the slag system used for deoxidation and desulfurization and the slag system used for removing inclusions are combined. Since the raw materials in the slag system cannot form a good ratio, it is easy to add another after one refining In the case of a slag system, external impurities are introduced into the molten steel, and it is not conducive to the temperature control in the subsequent bottom pouring atomization process

Method used

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  • Preparation method, secondary refining method and refining agent of PMHSS (powder metallurgy high speed steel)
  • Preparation method, secondary refining method and refining agent of PMHSS (powder metallurgy high speed steel)

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Experimental program
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Effect test

Embodiment 1

[0020] The following table lists the composition and content of the primary refining agent:

[0021]

[0022] The following table lists the composition and content of the secondary refining agent:

[0023]

[0024] Note: The viscosity measurement temperature is 1600°C.

Embodiment 2

[0026] This embodiment relates to a powder metallurgy high-speed steel refining method outside the furnace. The primary refining agent and the secondary refining agent involved in this method all use the ingredients in Example 1, and for the convenience of illustrating the industrial implementation of the present invention, in In this embodiment, the raw materials containing the active ingredients in the first embodiment are selected, such as CaF 2 Adopt fluorite powder, MgO adopts dolomite etc., the detailed steps of this method are as follows:

[0027] Step 1, one-time refining, adding a refining agent to molten steel for one-time refining:

[0028] a. Prepare the baked tundish, and add the weighed limestone and fluorite powder to the bottom of the tundish;

[0029] b. Pour the molten steel formed by intermediate frequency smelting at a temperature of 1600-1680°C into the tundish;

[0030] c. From the tundish to the refining station, pass argon gas, the flow rate is 80-160...

Embodiment 3

[0039] This embodiment relates to a preparation method of powder metallurgy high-speed steel, which includes the steps of molten steel smelting, out-of-furnace refining, bottom pouring and atomization, powder sheathing, sealing welding and exhausting, hot isostatic pressing, and forging. , wherein the out-of-furnace refining adopts the method steps of Embodiment 2.

[0040] After the second step of the embodiment is completed, the bottom pouring atomization can be carried out. Specifically, after the temperature of the bottom pouring atomization is stabilized in the above steps, the flow rate of argon gas is controlled at 10-50L / min, and the atomization starts. At this time, the slag The slag resistance reaches a relatively stable state, and the atomization temperature can be controlled within the fluctuation range of 5°C, which not only provides a stable atomization effect, but also stabilizes the heat preservation of the molten steel and maintains the calmness of the molten s...

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Abstract

The invention relates to an adding treatment agent for preparing PMHSS, in particular to a refining agent for secondary refining refining of the PMHSS. The refining agent comprises a primary refining agent for performing desulfuration and deoxidation during primary refining and a secondary refining agent for performing secondary refining after the primary refining. At the same time, the invention further relates to a secondary refining method of the PMHSS applying the refining agent and a preparation method of the PMHSS applying the secondary refining method. Two times of waste washing are adopted, that is, the primary refining agent is adopted for the first waste washing, so that desulfuration and deoxidation on molten steel are realized, then the secondary refining agent is added to remove impurities, and the purity of the molten steel is effectively improved.

Description

technical field [0001] The invention relates to an additive treatment agent for powder metallurgy high-speed steel preparation, in particular to a refining agent for powder metallurgy high-speed steel refining outside the furnace, and at the same time the invention also relates to a powder metallurgy high-speed steel refining outside the furnace using the refining agent method, and a method for preparing powder metallurgy high-speed steel using the out-of-furnace refining method. Background technique [0002] The traditional powder metallurgy high-speed steel preparation method usually includes steps such as molten steel smelting, out-of-furnace refining, bottom pouring atomization, powder sheathing sealing welding extraction, hot isostatic pressing, and forging. In these process steps, the refining outside the furnace is to pour the molten steel initially smelted in a conventional steelmaking furnace into a ladle or a special container, and use the refining agent in the lad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/076C22C33/02B22F9/08
CPCY02P10/20
Inventor 邵青立郑伟辛栋梅张国平孙瑞谦
Owner HEYE SPECIAL STEEL
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