Preparation and application method of inoculant for tissue deterioration and refinement of high-speed steel for roller

A technology of metamorphic refinement and high-speed steel, which is applied in the field of metal casting technology, can solve the problems of inconspicuousness, coarse grains, unsatisfactory grain and structure refinement of high-speed steel alloy matrix for rolls, etc., to avoid specific gravity segregation, The effect of improving the comprehensive mechanical properties

Inactive Publication Date: 2012-07-25
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the as-cast structure of the high-speed steel roll refined by such an inoculant, the grains are still relatively coarse, the phenomenon of carbide breaking is not obvious, and the mechanical properties of the high-speed steel alloy for the roll are not greatly improved.
Since the grain size of its refiner is far from nanoscale, the refinement effect on the grain and structure of the high-speed steel alloy matrix for rolls is not ideal

Method used

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  • Preparation and application method of inoculant for tissue deterioration and refinement of high-speed steel for roller
  • Preparation and application method of inoculant for tissue deterioration and refinement of high-speed steel for roller
  • Preparation and application method of inoculant for tissue deterioration and refinement of high-speed steel for roller

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] The preparation method of the inoculant used for the modification and refinement of the high-speed steel structure for the roll adopts the rapid quenching strip method, and the steps are as follows:

[0069] Step One, Ingredients

[0070] Ferroniobium, ferro-vanadium master alloy and pig iron from the foundry raw material market are used as raw materials, wherein the composition of ferroniobium master alloy is 65% niobium and 35% iron by mass percentage, and the composition of ferro-vanadium master alloy is 49% vanadium and 51% by mass % iron, according to the set mass ratio Fe: V: Nb=5.6: 1.9: 1.5, weigh the required ferro-niobium, ferro-vanadium and pig iron;

[0071] The second step, melting

[0072] Mix the ferroniobium, ferrovanadium and pig iron weighed in the first step into a vacuum melting furnace, make them fully mixed evenly after melting and solidify into a FeVNb master alloy block;

[0073] The third step, centrifugal quick quenching

[0074] Weigh the r...

Embodiment 2

[0076] The preparation method of the inoculant used for the modification and refinement of the high-speed steel structure for the roll adopts the rapid quenching strip method, and the steps are as follows:

[0077] Step One, Ingredients

[0078]Ferroniobium, ferro-vanadium master alloy and pig iron from the casting raw material market are used as raw materials, wherein the composition of ferroniobium master alloy is 68% niobium and 32% iron by mass percentage, and the composition of ferro-vanadium master alloy is 51% vanadium and 49% by mass % iron, according to the set mass ratio Fe: V: Nb = 4.4: 3.1: 2.5, weigh the required ferro-niobium, ferro-vanadium and pig iron;

[0079] The second step, melting

[0080] Mix the ferroniobium, ferrovanadium and pig iron weighed in the first step into a vacuum melting furnace, make them fully mixed evenly after melting and solidify into a FeVNb master alloy block;

[0081] The third step, centrifugal quick quenching

[0082] Weigh the ...

Embodiment 3

[0084] The preparation method of the inoculant used for the modification and refinement of the high-speed steel structure for the roll adopts the rapid quenching strip method, and the steps are as follows:

[0085] Step One, Ingredients

[0086] Ferroniobium, ferro-vanadium master alloy and pig iron from the casting raw material market are used as raw materials, wherein the composition of ferroniobium master alloy is 70% niobium and 30% iron by mass percentage, and the composition of ferro-vanadium master alloy is 53% vanadium and 47% by mass % iron, according to the set mass ratio Fe: V: Nb=3.2: 4.3: 3.5, weigh the required ferro-niobium, ferro-vanadium and pig iron;

[0087] The second step, melting

[0088] Mix the ferroniobium, ferrovanadium and pig iron weighed in the first step into a vacuum melting furnace, make them fully mixed evenly after melting and solidify into a FeVNb master alloy block;

[0089] The third step, centrifugal quick quenching

[0090] Weigh the r...

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Abstract

The invention provides a preparation and application method of an inoculant for tissue deterioration refinement of high-speed steel for a roller, relating to a metal casting process. The inoculant is a thin strip obtained by mixing ferrovanadium, ferroniobium and pig iron under the condition that the mass ratio of Fe to V to Nb is (3.2-5.6):(1.9-4.3):(1.5-3.5) through the processes of smelting, solidifying and fast quenching. The inoculant is added in the process of smelting the high-speed steel for the roller to enable Nb and V to form a complex carbide (V, Nb)C in situ, and the density of the complex carbide is approximately identical to the density of the molten steel when the complex carbide is used as a primary crystal to be separated out. Thus, the inoculant is used as an inoculation deterioration nucleation core of matrix alloy liquid for integrally refining grains and tissues of a high-speed steel matrix for the roller, so that the comprehensive mechanical properties of the high-speed steel material for the roller are improved.

Description

technical field [0001] The technical solution of the present invention relates to metal casting technology, in particular to the preparation and application method of an inoculant for the modification and refinement of high-speed steel structures for rolls. Background technique [0002] The roll is an extremely important part for the rolling and forming of steel materials to realize its various functions and substantial value-added. The manufacturing level of metallurgical rolls is also one of the symbols that reflects the level of a country's steel manufacturing industry. In order to expand the variety of steel products in our country and improve the quality of steel products, higher requirements must be put forward for the demand and variety of rolls. Therefore, the development of new roll material and its manufacturing process to meet the needs of my country's steel rolling industry has become an important topic at present. [0003] High-speed steel rolls use high-carbon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04C22C33/08B22F9/06
Inventor 崔春翔孙继兵刘双进戚玉敏梁敏祖宁
Owner HEBEI UNIV OF TECH
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