JPS6033308A - Steel modifier - Google Patents

Abstract

PURPOSE:To obtain the economic modifier unnecessary for the process where steel is manufactured by melting, by agglomerating titanium powder and iron powder. CONSTITUTION:The modifier adding titanium component into steel is manufactured by, for example, compressive forming of the mixture of titanium powder and iron powder to lumpy state. Though the particle size of titanium powder is not limited, it should, as a rule, be preferably about 60 mesh at the max. Further, iron powder should be preferably about 60 mesh at the max, too, and that used for powder metallurgy should be, as a rule, preferable because of its high purity. Though the mixing ratio of titanium powder and iron powder may be variously changeable according to the final purpose for modification, the percentage of titanium powder should preferably be about 10-90wt% of total amount. Further, for the size of lump, 5-100g degree per one piece is easy to be used. This modifier indicates the same effect as that of traditional modifier consisting of ferrotitanium alloy.

Description

DETAILED DESCRIPTION OF THE INVENTION In recent years, it has become common practice to add titanium components to steel to improve the properties of the steel, and the titanium component is used in structural alloy steels, high-strength steels, and stainless steels.

Conventionally, ferrotitanium has been mainly used as a titanium component added to steel, stainless steel, etc., and ferrotitanium is added to molten steel in a converter or ladle for steelmaking, and modifications such as adjusting the composition of steel hot water are carried out. It is being said.

Ferrotitanium is produced by melting steel pieces in a high-temperature heating furnace such as a high-frequency induction furnace, and adding and melting metallic titanium pieces in a closed state or in an argon atmosphere to create a ferrotitanium alloy of any composition. shall be. This is cooled, pulverized, and further adjusted in particle size to produce a ferrotitanium steel modifier.

The composition, particle size, etc. of the ferrotitanium alloy produced as described above are standardized according to Japanese Industrial Standards.

The present invention aims to provide an economical modifier that does not require the manufacturing process of melting steel, unlike conventional steel modifiers for ferrotitanium alloys.

The steel modifier of the present invention can be used as a raw material for steel for deoxidation, denitrification, or
This is a steel modifier that can be used for purposes such as adding alloying components, and is characterized by being made by agglomerating titanium powder and iron powder.

In the present invention, the particle size of the titanium powder is not limited, and granular or granular particles of, for example, about 10 mesh can be used, but it is usually desirable to have a particle size of 60 mesh or less, and for example, in the industrial production of titanium sponge. Therefore, it is preferable to use powdered titanium produced along with titanium sponge when titanium tetrachloride is reduced with metallic sodium or metallic magnesium. Iron powder of about 10mesh can be used like titanium powder, but 60mesh
Sh or less is desirable, and for example, those commonly used for powder metallurgy can be desirably used. These powders are preferable because they have high purity and there is no concern about an increase in impurities such as phosphorus, sulfur, hydrogen, and oxygen, which are avoided in steel compositions. The mixing ratio of titanium powder and iron powder is
Although various changes can be made depending on the purpose of final modification, it is preferable to mix titanium powder at a ratio of 10 to 90% by weight and 1t% of the total, and the size of each piece is 52 to 1 t%.
A value of about 002 is convenient for use.

There are no particular limitations on the method of agglomeration, but it is economical to use compression molding, and the mixture of titanium powder and iron powder is compressed and molded at a rate of at least it/i, preferably at least 2 t/or1. Increasing the compression pressure increases the mechanical strength of the lump, but it is economically disadvantageous to increase the mechanical strength only by increasing the compression pressure, so it is desirable to sinter the material once compression molded. Sintering is performed at 600°C to 800°C in vacuum or in an inert gas atmosphere for about 2
It can be done in hours to 5 hours.

The main advantages of the present invention are listed below.

Equipment costs and processing costs for manufacturing 1-factor titanium alloy,
Electrical energy can be saved and streamlined.

Since two powders are mixed and molded, the composition is uniform and the size and shape can be freely determined.

Since it is made into three lumps, it is possible to prevent dust formation during handling, improve the working environment, and facilitate mechanization.

An example of implementing the present invention will be described.

Example 1 70 parts of the titanium powder shown in Table 1 and 30 parts of the iron powder shown in Table 2 were thoroughly mixed and molded using a powder molding machine to a size of about 3 cm in diameter at a pressure of 76" 2.000 g/cni. Molded into a spherical shape (fishing platform 1i') with an apparent specific gravity of 4.6 f/cm,
A steel modifier with a porosity of 85 cm was made. Even when this was tested by dropping it from a height of 5 meters onto a steel plate, it did not break. This steel modifier is poured into a steelmaking converter ladle in the same way as conventional steel modifiers made of ferrotitanium alloys, and used for the purpose of deoxidizing and denitrifying steel or adding alloy components. In particular, it is possible to obtain the same effects as when using conventional ferrotitanium alloys.

Table 1 Titanium powder Chemical composition (ch) Particle size distribution Table 2 Iron powder Chemical composition (rice cake) Particle size distribution

Claims (3)

[Claims] (1) A steel modifier characterized by agglomerated titanium powder and iron powder. (2) The steel modifier according to claim 1, wherein the steel modifier is compression molded during agglomeration. (3) The steel modifier according to claim 1, wherein the steel modifier is formed into agglomerates, compression molded, and further sintered.