KR19990085467A - Method for manufacturing copper-nickel-manganese-tin-titanium alloy for high-strength wire rod and plate - Google Patents

Abstract

The present invention relates to a copper (Cu) -nickel (Ni) -manganese (Mn) -statin (Sn) -titanium (Ti) alloy for high strength wire and plate materials,

It is an object of the present invention to adopt a continuous casting process for the production of a thin or small rod-like ingot, to employ cold working for all plastic working, and to substitute a portion of the nickel (Ni) content, which is high in the high strength copper alloy, Nickel-manganese (Mn) -stannum (Sn) -titanium (Ti) for the high strength wire and plate materials that reduce manufacturing cost by improving the strength as well as deoxidizing agent by adding a small amount of cheap titanium (Ti) Ti) alloy and a method of manufacturing the same.

The present invention replaces a part of nickel (Ni) which is a solid element in a copper (Cu) -nickel-tin (Sn) based alloy with another manganese (Mn) as a solid element to control the total content of solid elements (Cu) -nickel (Ni) (Ni) by adding titanium (Ti), which is a precipitation strengthening element, in order to control the content of tin ) -Manganese (Mn) -statin (Sn) -titanium (Ti) alloy.

Description

Method for manufacturing copper-nickel-manganese-tin-titanium alloy for high-strength wire rod and plate

The present invention relates to a copper (Cu) -nickel (Ni) -manganese (Mn) -stin (Sn) -titanium (Ti) alloy for high strength wire and plate materials and a method for manufacturing the same.

Among conventional copper alloys, there are copper (Cu) -nickel-tin (Sn) ternary alloys which exhibit high strength as a spinodal decomposition strengthening effect. A representative composition of this alloy is 9% nickel ) And 6% tin (Sn), and the remaining 85% consists of copper (Cu).

85% Copper (Cu) -9% Nickel (Ni) -6% Tin (Sn) ternary alloy can obtain tensile strength over 1,000 MPa through processing heat treatment using spinodal decomposition strengthening effect, It is possible to replace the beryllium copper (Cu-Be), which is an alloy, with a high strength and a low manufacturing cost. In particular, it has an advantage of not using toxic metals such as beryllium (Be).

However, the ingot of copper (Cu) - nickel (Ni) - tin (Sn) based spinodal decomposition strengthening alloy can not be subjected to plastic working such as rolling, forging, and extrusion in hot, and it is difficult to produce sheet material, bar material and wire material.

Therefore, although a part of the plate material, the bar material and the wire material produced by the powder metallurgy are produced, there is a problem that it is difficult to mass-produce it and it is very expensive because of the limitation of the manufacturing process.

In order to solve the above problems, an object of the present invention is to provide a process for producing a thin plate-shaped or small-rod-shaped ingot by continuous casting, cold working, cold working, (Cu) -nickel (Ni) alloy for high-strength wire and plate materials, which improves strength by adding a small amount of titanium (Ti) having a large precipitation strengthening effect as well as deoxidizing agent, Manganese (Mn) - tin (Sn) - titanium (Ti) alloy and a method of manufacturing the same.

The above object of the present invention can be achieved by a copper alloy for producing a high strength wire rod and a sheet material, which comprises 1.0 to 1.0 wt% (weight percentage) of nickel (Ni), 0.1 to 1.0 wt% (Sn), 0.1 to 5.0 wt% (weight percentage) of titanium (Ti), and the balance of copper (Cu) in an amount of 0.1 to 10.0 wt% .

It is another object of the present invention to provide a method of stacking alloying materials which is prepared by preliminarily weighing metal elements to be alloyed and then repeating the lamination of copper (Cu) and nickel (Ni) ;

And a dissolving step of dissolving the manganese (Mn) by dissolving the manganese (Mn) after removing the slag when both of the copper and nickel are dissolved by starting the dissolution;

And an alloy process for continuously introducing and alloying tin (Sn) and titanium (Ti) to the extent that heating is stopped or a very low heat source is supplied when manganese (Mn) is completely dissolved;

A continuous casting process of a rod or a sheet material to produce an ingot in the form of a bar or plate through continuous casting by transferring the molten metal to a warming furnace when it is determined that the alloying elements are sufficiently dissolved and diffused and homogenized;

The ingot in the form of a bar or plate is homogenized at a temperature of 850 占 폚 to 50 占 폚 for 1 to 10 hours and then cooled;

A pickling process for pickling the surface of the material through pickling;

A plate and rod rolling process in which a rod or sheet is processed into an intermediate state by a cold working process at a working rate of 73% or more;

A solution treatment step of holding the solution at a temperature of 850 占 폚 to 50 占 폚 for 0.5 to 1.0 hour and then cooling the solution to recrystallization and solidification;

A pickling process for pickling the surface of the material through pickling;

A cold rolling and cold drawing process in which the rod material or the plate material in the intermediate material state subjected to the pickling treatment is cold-worked again;

And a aging treatment step of maintaining the temperature at 300 to 550 DEG C for 1 to 20 hours, followed by air cooling and aging treatment.

It is still another object of the present invention to provide a method of manufacturing a copper-nickel-manganese-tin-titanium alloy by adopting a continuous casting method in the production of a small- All plastic working is accomplished by providing a cold working process.

1 is a manufacturing process diagram of the present invention.

Description of the Related Art

(1): Alloy material stacking charging process

(2): dissolution step

(3): Alloying process

(4): Continuous casting process of rods and plates

(5): homogenization treatment process

(6,9): Pickling process

(7): Plate and rod rolling process

(8): Solution treatment process

(10): cold rolling and cold drawing process

(11): aging treatment process

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG.

FIG. 1 is a manufacturing process diagram of the present invention, which includes a process of stacking an alloy material; A dissolution step; An alloy process; A continuous casting process of a rod and a plate material; A step of homogenizing the ingot; Pickling process; Plate and rod rolling processes; A solution treatment process; Pickling process; A cold rolling and cold drawing process; And an aging treatment process.

The composition of the copper alloy for the production of a high strength wire rod and a sheet material according to the present invention comprises 1.0 to 10.0 wt% (weight percentage) of nickel (Ni), 0.1 to 1.0 wt% (weight percentage) of manganese (Mn) (Sn), 0.1 to 5.0 wt% (weight percentage) of titanium (Ti), and the balance of copper (Cu).

The alloy of the present invention as described above is prepared by preliminarily weighing the metal elements to be alloyed and then stacking the copper (Cu) and nickel (Ni) in the order of the melting furnace, ;

And a dissolving step of dissolving the manganese (Mn) by dissolving the manganese (Mn) after removing the slag when both of the copper and nickel are dissolved by starting the dissolution;

And an alloy process for continuously introducing and alloying tin (Sn) and titanium (Ti) to the extent that heating is stopped or a very low heat source is supplied when manganese (Mn) is completely dissolved;

A continuous casting process of a rod or a sheet material to produce an ingot in the form of a bar or plate through continuous casting by transferring the molten metal to a warming furnace when it is determined that the alloying elements are sufficiently dissolved and diffused and homogenized;

The ingot in the form of a bar or plate is homogenized at a temperature of 850 占 폚 to 50 占 폚 for 1 to 10 hours and then cooled;

A pickling process for pickling the surface of the material through pickling;

A plate and rod rolling process in which a rod or sheet is processed into an intermediate state by a cold working process at a working rate of 73% or more;

A solution treatment step of holding the solution at a temperature of 850 占 폚 to 50 占 폚 for 0.5 to 1.0 hour and then cooling the solution to recrystallization and solidification;

A pickling process for pickling the surface of the material through pickling;

A cold rolling and cold drawing process in which the rod material or the plate material in the intermediate material state subjected to the pickling treatment is cold-worked again;

And an aging treatment step of maintaining the temperature at 300 to 550 캜 for 1 to 20 hours, followed by air cooling and aging treatment.

The present invention also relates to a method of manufacturing a copper-nickel-manganese-tin-titanium alloy by a continuous casting process in which a small-diameter rod or a plate-like ingot in a state capable of cold- . ≪ / RTI >

Hereinafter, an embodiment of the present invention will be described.

<Examples>

The alloy material manufacturing process of the present invention is premised on the assumption that continuous casting is introduced in producing an ingot in the form of a small-diameter rod or plate in a state in which cold-plastic working is possible.

Firstly, the metal elements to be alloyed are weighed in advance and then an appropriate amount of copper is placed on the bottom of the melting furnace. A layer of nickel (Ni) is laid on the layer, an appropriate amount of copper is again covered with nickel, (Cu) is used as a cover layer.

Then, when the molten copper and nickel are both dissolved, the slag is removed and then manganese (Mn) is added and dissolved.

When manganese (Mn) is completely dissolved, tin (Sn) and titanium (Ti) are continuously added to stop the heating or supply a very low heat source and stir well.

If it is judged that the alloying elements are sufficiently dissolved and diffused and homogenized, the molten metal is transferred to a warming furnace to produce ingots in the form of bars or plates through continuous casting.

In order to homogenize the internal properties of the ingot or plate, the ingot is maintained at a temperature of 850 ± 50 ° C for 1 to 10 hours, cooled, homogenized, and pickled to clean the surface.

Then, it is processed into an intermediate rod or sheet material at a working rate of 73% or more by cold drawing or cold rolling, maintained at a temperature of 850 ± 50 ° C for 0.5 to 1.0 hour, and then cooled with water to perform recrystallization and solidification treatment.

Here, the application of the cold working degree of 73% or more is intended to completely remove the casting structure and obtain a homogeneous plastic working fabric.

Pickling treatment is carried out to cleanly remove the oxide on the surface generated during the solution treatment process.

The rod or sheet material subjected to the pickling treatment in this intermediate state is further subjected to cold plastic working and then maintained at a temperature of 300 to 550 ° C for 1 to 20 hours and then air-cooled and aged to produce copper (Cu) -nickel (Ni) -manganese (Mn) (Sn) -based alloy Type spinodal decomposition products and the effects of copper (Cu) -nickel (Ni) -titanium (Ti) A high strength material can be obtained by the precipitation strengthening effect by the mold precipitate.

Here, the alloy component, the solution treatment temperature and time, the degree of cold working, the aging treatment temperature and time are important factors determining the physical properties of the material.

Examples of changes in physical properties according to various conditions obtained in the present invention are shown in Tables 1, 2, 3, 4 and 5 below.

Tables 1, 2 and 3 show chemical compositions for various alloy examples. Tables 2, 3 and 4 show the alloy ingot having such a composition is subjected to solution treatment after primary cold working for the purpose of removing the cast structure, And the tensile properties and the electrical resistivity values of the samples subjected to the aging treatment at 300 ° C, 350 ° C, 400 ° C and 450 ° C, respectively, for 3 hours.

Table 2 shows that when the conventional 85% copper (Cu) -9% nickel (Ni) -6% tin (Sn) ternary alloy was aged at 300-400 ° C. for 3 hours, the tensile strength was 1,043-1,195 MPa , An elongation of 7 to 9%, and an electrical resistivity of 10 to 14 Respectively.

And 85% copper (Cu) - copper alloy in which a part of 9% nickel (Ni) is replaced by manganese (Mn) in 85% copper (Cu) -9% nickel (Ni) -6% tin 9% [Ni (Ni) + Mn (MN)] - In the case of 6% tin (Sn) alloy, the tensile strength and the elongation can be obtained in the range of 837 to 1,156 MPa and 6 to 12% Electrical resistivity values are 11 to 26 .

(Mn) in the 85% copper (Cu) -9% nickel (Ni) -6% tin (Sn) ternary alloy and the tin (Sn) was reduced to 2-4%, the tensile strength was greatly reduced to 654-897 MPa.

In addition, the addition of a small amount of titanium (Ti) as a precipitation strengthening element to the existing 85% copper (Cu) -9% nickel (Ni) -6% tin (Sn) ternary alloy increases the tensile strength, And the elongation percentage tends to decrease.

On the other hand, in the case of the copper (Cu) -nickel-tin (Sn) -titanium (Ti) alloy of the present invention, copper (Cu) -6% nickel (Ni) -3% manganese In the case of the 6% tin (Sn) -titanium (Ti) alloy, the tensile strength is 1,050 MPa, the elongation is 5 to 6% and the electrical resistivity is 10 to 18 Lt; / RTI &gt;

These results suggest that replacing one-third of high-priced nickel (Ni) with low-cost manganese (Mn) in a high-strength copper alloy and adding a small amount of titanium (Ti) .

On the other hand, Table 5 shows the effect of the degree of cold working before aging on the tensile strength after aging in various alloys, and an increase in the degree of cold working improves the tensile strength.

Table 1 Chemical composition examples of various alloys (unit:% by weight)

Table 2 Change in tensile strength due to heat treatment (unit: MPa)

Table 3 Change in elongation according to processing heat treatment (Unit:%)

Table 4 Change in electrical resistivity due to processing heat treatment (unit: )

Table 5 Change in tensile strength according to cold working degree (unit: MPa)

As described above, the high-strength high-resilience copper alloy of the present invention is produced by continuous casting of a thin plate-shaped or small-rod-shaped ingot by continuous casting and cold working is adopted in all the processes. Among nickel alloys, nickel (Mn) exhibiting a function similar to that of nickel (Ni), and the content of the total solid element was also controlled. In proportion thereto, the amount of tin (Sn) leading to the decomposition product of spinodal was also controlled, (Ti), which is one of the elements showing the precipitation strengthening effect, is added and added to the molten salt at a high temperature. As a result, It has good oxidizing ability and it can deoxidize in the molten metal, which is good for refining effect to clear the molten metal. It is possible to create new demand as a material for connector, con- tactor, spring and spectacle frame by reducing manufacturing cost by replacing existing high-strength beryllium copper or copper-9% nickel-6% tin-based spin- .

Claims (3)

The composition of the copper alloy for the production of the high strength wire rod and plate material is composed of 1.0 to 10.0 wt% (weight percentage) of nickel (Ni), 0.1 to 1.0 wt% (weight percentage) of manganese (Mn) (Ti) of 0.1 to 5.0 wt% (weight percentage) and the remainder of copper (Cu), the copper (Cu) for high strength, and the copper Cu) - Nickel (Ni) - Mn (Mn) - Tin (Sn) - Titanium (Ti) alloy. A method for producing a copper (Cu) -nickel (Ni) -manganese (Mn) -statin (Sn) -titanium (Ti) alloy for high- An alloying material stacking step of preparing the metal elements to be alloyed in advance and then stacking the copper (Cu) and nickel (Ni) stacks on the bottom of the melting furnace in the order of copper and finally covering them with copper (Cu); And a dissolving step of dissolving the manganese (Mn) by dissolving the manganese (Mn) after removing the slag when both of the copper and nickel are dissolved by starting the dissolution; And an alloy process for continuously introducing and alloying tin (Sn) and titanium (Ti) to the extent that heating is stopped or a very low heat source is supplied when manganese (Mn) is completely dissolved; A continuous casting process of a rod or a sheet material to produce an ingot in the form of a bar or plate through continuous casting by transferring the molten metal to a warming furnace when it is determined that the alloying elements are sufficiently dissolved and diffused and homogenized; The ingot in the form of a bar or plate is homogenized at a temperature of 850 占 폚 to 50 占 폚 for 1 to 10 hours and then cooled; A pickling process to clean the surface of the material through pickling; A plate and rod rolling process in which a rod or sheet is processed into an intermediate state by a cold working process at a working rate of 73% or more; A solution treatment step of holding the solution at a temperature of 850 占 폚 to 50 占 폚 for 0.5 to 1.0 hour and then cooling the solution to recrystallization and solidification; A pickling process to clean the surface of the material through pickling; A cold rolling and cold drawing process in which the rod material or the plate material in the intermediate material state subjected to the pickling treatment is cold-worked again; (Ni) -manganese (Mn) - tin (Cu) - nickel (Ni) - manganese (Mn) alloy for high strength wire rod and sheet material, characterized in that the aging treatment step is carried out by aging treatment after maintaining the temperature at 300 to 550 ° C for 1 to 20 hours, Sn) -titanium (Ti) alloy. In a manufacturing process of a copper (Cu) -nickel (Ni) -manganese (Mn) -statin (Sn) -titanium (Ti) alloy for high strength wire rod and plate, (Cu) -nickel (Ni) alloy for high-strength wire and plate material, characterized in that continuous casting is employed to produce ingots in the form of small rods or plates capable of being subjected to cold plastic working, and all the plastic working is cold- (Mn) - tin (Sn) - titanium (Ti) alloy.