JP2002302722A - High strength bronze alloy and production method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high strength bronze alloy which has high strength than that of the conventional bronze alloy, has mechanical properties at least close to those of a high tensile brass alloy or an aluminum bronze alloy, and exhibits high strength more than that of the alloys, and a production method therefor. SOLUTION: The alloy has a composition containing, by weight, 1.0 to 15.0% Sn, 0.1 to 8% Ni, 0.05 to 25% of one or more kinds selected from Pb, Bi, Sb, Fe, Al, Si, Mn, Cr, Ti, Nb, Co, Mo, Zr, Mg and V, and the balance Cu with impurities. Further, the alloy is cast by a casting method where rapid cooling is performed such as mold casting and continuous casting, and is next subjected to heat treatment, so that its strength can further be improved. Thus, (1) by the addition of Ni, the alloy having mechanical properties close to those of high tensile brass and aluminum bronze can be obtained. (2) By performing the heat treatment, its strength is made higher. (3) By producing the alloy by a casting method where rapid cooling is relatively possible such as mold casting and continuous casting, the effect close to that by a solution treatment is utilized, and by the subsequent heat treatment, its strength can further be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-strength bronze alloy excellent in castability and corrosion resistance and a method for producing the same. The main use of the alloy of the present invention is suitable for water faucet fittings and water fittings for general piping, and sliding members used in corrosive atmospheres such as fresh water and seawater.

[0002]

2. Description of the Related Art At present, bronze-based alloys include Cu-Sn.
-Zn system (CAC402, 403), Cu-Sn-Pb system (CA
C602-605), Cu-Sn-Zn-Pb-based (CAC406,4
07), Cu-Sn-P (CAC502, 503) is widely used and has the following features. 1. Good corrosion resistance 2. 2. Good pressure resistance 3. Good machinability Good abrasion resistance5. Good seizure resistance

[0003]

The above-mentioned conventional bronze alloys are mainly used for water faucet fittings, water fittings for general piping, and sliding members used in corrosive atmospheres such as fresh water and seawater. However, it is a disadvantage that the strength is lower than that of a high-strength brass alloy or an aluminum bronze alloy.

In particular, tap water fittings for water supply and water fittings for general piping, in which Cu-Sn-Zn-Pb-based alloys are often used, often have a resin adhered to the outside by injection molding, and if the strength is low, the resin is injected. There is a disadvantage that the metal fitting is deformed by high pressure during molding.

The present invention has been made in view of the above circumstances, and has a higher strength than the above-mentioned conventional bronze alloy, and has at least a mechanical strength close to that of a high-strength brass alloy or an aluminum bronze alloy. It is an object of the present invention to provide a high-strength bronze-based alloy exhibiting the above high strength and a method for producing the same.

[0006]

In order to achieve the above-mentioned object, the present invention relates to a method for producing Sn by weight: 1.0 to 15,0%,
Ni: 0.1 to 8%, Pb, Bi, Sb, Fe, Al,
Si, Mn, Cr, Ti, Nb, Co, Mo, Zr, M
g, V: at least one of them: 0.05 to 25%, the balance being C
It is intended to provide a high-strength bronze-based alloy comprising u and impurities.

Further, Sn: 1.0 to 15.0 by weight%.
%, Ni: 0.1 to 8%, Zn: 0.05 to 18%, P
b, Bi, Sb, Fe, Al, Si, Mn, Cr, T
One or more of i, Nb, Co, Mo, Zr, Mg, and V: 0.05 to 25%, the balance also provides a high-strength bronze-based alloy comprising Cu and impurities.

Further, Sn: 1.0 to 15.0 by weight%.
%, Ni: 0.1 to 8%, P: 0.01 to 1%, Pb,
Bi, Sb, Fe, Al, Si, Mn, Cr, Ti, N
one or more of b, Co, Mo, Zr, Mg, and V:
It also provides a high-strength bronze alloy containing 0.05 to 25%, with the balance being Cu and impurities.

Further, Sn: 1.0 to 15.
0%, Ni: 0.1 to 8%, Zn: 0.05 to 18%,
P: 0.01 to 1%, Pb, Bi, Sb, Fe, Al,
Si, Mn, Cr, Ti, Nb, Co, Mo, Zr, M
g, V: at least one of them: 0.05 to 25%, with the balance being C
It also provides a high-strength bronze-based alloy comprising u and impurities.

On the other hand, the high strength bronze alloy according to the present invention can be further improved in strength by subjecting it to a heat treatment.

Further, the above-mentioned high-strength bronze alloy according to the present invention is cast by a quenching casting method such as die casting or continuous casting, and then subjected to a heat treatment.
Strength can be improved (claim 6).

Next, the effects of the constituents of the alloy of the present invention, the reasons for limiting the contents thereof, and the heat treatment conditions for improving the strength will be described.

Sn: Sn is effective in strengthening the matrix, improving wear resistance, and suppressing zinc-free corrosion. To obtain the above effect, less than 1 wt% is not sufficient, and 15 wt%
%, The effect is saturated.

Zn: Since Zn has a high vapor pressure, it prevents oxidation and gas absorption at the time of melting, and at the same time improves the strength of the material by forming a solid solution in the matrix. If the content exceeds 18% by weight, dezincification corrosion tends to occur, and the strength of the alloy is reduced.

P: P has the effect of preventing oxidation during melting and casting, and has the effect of improving castability and soundness of the material. If the content exceeds 1 wt%, the toughness of the material is impaired.

Ni: Ni strengthens the matrix and improves the hardness of the material. If it is less than 0.1% by weight, there is no effect, and if it is more than 8% by weight, elongation is reduced and the material becomes brittle and causes cracking.

Pb, Bi: Pb and Bi are effective in machinability and seizure resistance.

Sb: Sb has the effect of reducing the amount of porosity generated when the present material is cast.

Fe: Fe, together with Ni, strengthens the matrix of the alloy and improves the hardness.

Al: Al has the effect of deoxidizing the molten metal, thereby preventing the occurrence of casting defects and improving the strength of the material.

Si: Like Al, Si has the effect of deoxidizing the molten metal, and prevents the occurrence of casting defects and at the same time improves the strength of the material.

Mn: Mn removes (deoxidizes) oxygen in the molten metal, improves the flow of molten metal and the quality of the molten metal, and also improves the ductility.

Mg: Mg reduces the decrease in ductility at high temperatures.

Cr, Ti, Nb, Co, Mo, Zr,
V: Cr, Ti, Nb, Co, Mo, Zr, and V are effective in reducing the size of crystal grains, improving elongation, and abrasion resistance.

Heat treatment: The alloy of the present invention is subjected to the following heat treatment to further improve the strength.

Solution heat treatment or quenching: 600-9
After being sufficiently maintained at a temperature of 50 ° C., it is rapidly cooled.

Age hardening heat treatment or tempering or annealing: The solution heat treated or quenched alloy is
After the temperature is sufficiently maintained at a temperature of 00 to 600 ° C., cooling is performed.

Annealing: An alloy which has been subjected to solution heat treatment or quenching, or an alloy which has not been subjected to the above-mentioned heat treatment, is sufficiently maintained at a temperature of 200 to 600 ° C., and then cooled.

[0029]

Examples (1) Test materials Table 1 shows alloys of the present invention, and Table 2 shows alloys of comparative examples. Nos. 1 to 9 and No. A shown in Tables 1 and 2
-No. C was melted in a high frequency induction furnace.

The alloy was manufactured by the following three manufacturing methods. Cast to JIS A test material. Cast into JIS A test material and heat treated at 500 ° C. Casted on JIS E test material (mold casting with quenching effect). JIS E test material cast and heat treated at 500 ° C (mold casting with quenching effect).

[0031]

[Table 1]

[0032]

[Table 2]

(2) Tensile test and hardness test A JIS Z 2201 14A tensile test piece (with a hardness piece) was machined from each test material, and each test was performed. Table 3 shows the results.
To Table 6 below.

[0034]

[Table 3]

[0035]

[Table 4]

[0036]

[Table 5]

[0037]

[Table 6]

[0038]

From the test results described above, it can be seen that the alloy of the present invention and the method for producing the same can be used in the conventional Cu-Sn-Zn.
System, Cu-Sn-Pb system, Cu-Sn-Zn-Pb system,
Compared with the Cu-Sn-P-based bronze-based alloys, it has the following excellent results.

By adding Ni, an alloy having higher mechanical strength than conventional bronze-based alloys and having mechanical properties close to high-strength brass and aluminum bronze could be obtained. By performing the heat treatment, a higher strength was obtained. By manufacturing using a casting method that can be relatively rapidly cooled, such as mold casting or continuous casting, the effect close to solution treatment was utilized, and the strength could be further increased by subsequent heat treatment.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) // C22F 1/00 604 C22F 1/00 604 611 611 630 630A 630C 630J 630Z 641 641A 691 691B 692 692A (72 ) Inventor Wataru Yago 1 in Nishi-Ashihara, Tateyama-machi, Tateyama-cho, Toyama Prefecture Inside Chuetsu Alloy Casting Co., Ltd. Inside the foundry Co., Ltd. (72) Atsushi Yaskawa, Inventor 1 at Nishi-Ashihara, Tateyama-machi, Taniyama, Toyama Pref. No. 1 in Chuetsu Alloy Casting Co., Ltd.

Claims (6)

[Claims] (1) Sn: 1.0 to 15.0% by weight.
Ni: 0.1 to 8%, Pb, Bi, Sb, Fe, Al,
Si, Mn, Cr, Ti, Nb, Co, Mo, Zr, M
g, V: at least one of them: 0.05 to 25%, the balance being C
High-strength bronze-based alloy consisting of u and impurities. 2. Sn: 1.0 to 15.0% by weight.
Ni: 0.1 to 8%, Zn: 0.05 to 18%, Pb,
Bi, Sb, Fe, Al, Si, Mn, Cr, Ti, N
one or more of b, Co, Mo, Zr, Mg, and V:
A high-strength bronze alloy containing 0.05 to 25%, with the balance being Cu and impurities. 3. Sn: 1.0 to 15.0% by weight.
Ni: 0.1 to 8%, P: 0.01 to 1%, Pb, B
i, Sb, Fe, Al, Si, Mn, Cr, Ti, N
one or more of b, Co, Mo, Zr, Mg, and V:
A high-strength bronze alloy containing 0.05 to 25%, with the balance being Cu and impurities. 4. Sn by weight%: 1.0 to 15.0%,
Ni: 0.1 to 8%, Zn: 0.05 to 18%, P:
0.01-1%, Pb, Bi, Sb, Fe, Al, S
i, Mn, Cr, Ti, Nb, Co, Mo, Zr, M
g, V: at least one of them: 0.05 to 25%, with the balance being C
High-strength bronze-based alloy consisting of u and impurities. 5. The method for producing a high-strength bronze-based alloy according to claim 1, wherein heat treatment is performed. 6. The method according to claim 1, wherein the casting is performed by a quenching casting method, and then heat treatment is performed.
The method for producing a high-strength bronze-based alloy according to the above.