JP2530657B2 - Copper alloy and method for producing the same - Google Patents

Abstract

The copper alloy consists of 0.05 to 0.4 % of zinc, 0.02 to 0.3 % of magnesium and 0.02 to 0.2 % of phosphorus, the remainder being copper and impurities resulting from manufacture, and is intended to be used especially as a material for continuous casting moulds.

Description

DETAILED DESCRIPTION OF THE INVENTION A continuous mold for continuous casting of high melting point metals such as steel (St
The material used for the production of ranggiesskohille) has long been used mainly for the first time in the form of copper of the SF-Cu type, which, due to its high thermal conductivity, can transfer heat from the melt very rapidly. The wall thicknesses of this mold are chosen to be very thick so that they adequately meet the expected mechanical stresses.

In order to improve the heat resistance, it has been proposed to make continuous casting molds from alloys with at least 85% copper and at least one other alloying element which causes precipitation hardening. As alloying elements, up to 3% of chromium, silicon, silver and beryllium are proposed. Continuous casting molds made from this work material are also not entirely satisfactory. This is because, in particular, the alloying components silicon and beryllium significantly reduce the thermal conductivity (see Austrian patent 234,930).

All these solutions could still not be completely satisfactory as a work material for continuous casting moulds.

Therefore, the present invention has a problem to provide a copper alloy having high thermal conductivity, particularly high mechanical strength at a temperature of 300 ° C. or higher and high temperature flexibility. This work material should be particularly applicable to the production of continuous casting molds.

The above problems are zinc 0.05 to 0.4%, manganese 0.02
To 0.3%, phosphorus 0.02 to 0.2%, the balance being a copper alloy consisting of copper and impurities depending on the manufacturing conditions.

The addition of zinc or magnesium only slightly reduces the thermal conductivity of copper, whereas the addition of phosphorus significantly reduces the thermal conductivity. Mechanical strength is improved by the addition of zinc, magnesium or phosphorus. However, the thermal conductivity is commercially available by adding together all three elements within the ranges specified in this invention.
It is quite surprising that there is little or no reduction compared to SF-copper.
The mechanical strength is SF due to solid solution hardening (Mischkristallhrtung) and due to the additional hardening effect due to the formation of phosphides, which is capable of causing precipitation.
-Substantially higher compared to copper. Especially the heat resistance is SF-
The value is considerably higher than that of copper. Zinc 0.1 to 0.25
%, Magnesium 0.05 to 0.15%, phosphorus 0.05 to 0.
An alloy consisting of 1%, the balance being copper and impurities depending on the manufacturing conditions, proved to be particularly advantageous.

Adding silicon up to 0.2%, preferably up to 0.1%, has a positive effect on the hardness and thus on the wear resistance.

Addition of up to 0.15% zirconium results in improved flexibility at elevated temperatures.

Moreover, they allow further improvement of the softening properties in combination with a suitable heat treatment. The addition of both does not lead to a substantial decrease in thermal conductivity at the concentrations specified in the present invention.

The present invention further relates to a method for producing the above copper alloy.

According to it, the alloy is hot worked after casting,
Annealed at 1 to 550 ° C. for 1 to 5 hours and finally cold worked by at least 10%.

A cold work of at least 10% between hot working and the age hardening at 300 to 550 ° C. has a positive effect on the homogenization state and the combination of properties.

It is particularly advantageous to hot work the alloy above the temperature of maximum solubility of the alloy components and then quench from at least 750 ° C. With these treatments an additional hardening effect is achieved. However, it is also possible to perform solution treatment separately from hot working.

In order to increase the strength, it is advantageous to carry out a cold working of at least 10% after the last aging effect annealing.

 The invention will be described in more detail with reference to the examples.

An alloy consisting of 0.19% zinc, 0.09% magnesium, 0.07% phosphorus, the balance copper and impurities depending on the manufacturing conditions is hot worked by extrusion after casting and then 20% by drawing (Ziehen), cold working did. The alloy was then annealed at 500 ° C for 5 hours. Then, 10%, 20% and 40% cold worked samples were produced respectively. The properties of these samples are listed in Tables A, B and C as compared to SF-copper and copper-chromium-zirconium alloys.

It is a material often used for continuous casting molds.
A comparison with SF-copper clearly shows that the mechanical strength is generally about 50% higher at the same degree of deformation. The thermal conductivity is also higher. However, it is essential that the softening property at high temperature be extremely advantageous. That is, the work material according to the present invention has the same thermal conductivity.
It begins to soften at temperatures above 500 ° C. Furthermore, the creep at relatively high temperatures is rather low, which guarantees an improved unfired strain. Collectively, it can be expected that the copper alloys disclosed by the present invention will be excellent as a working material for continuous casting molds. Similarly, the alloy according to the present invention is extremely superior in machinability as compared with the copper-chromium alloy. However, because the alloy according to the invention is fairly simple to produce and the alloying elements are relatively inexpensive, the continuous casting molds obtained from this new machining material are less expensive at the same Standverhalten.

The industrial properties of the alloys according to the invention are of considerable advantage if one knows the hot working at the solution treatment temperature and then quenches them and then follows the operating procedure described above.
By precipitating the intervening phase from the copper matrix,
Even more advantageous mechanical strength and thermal conductivity values are obtained.

Claims (13)

(57) [Claims] 1. Zinc 0.05 to 0.4%, magnesium 0.02
Copper alloy for continuous casting molds, which contains 0.03 to 0.3% of phosphorus, 0.02 to 0.2% of phosphorus, and the balance of copper and impurities depending on manufacturing conditions. 2. Zinc 0.1 to 0.25%, magnesium 0.05
The copper alloy for a continuous casting mold according to claim 1, wherein the copper alloy is 0.1 to 0.15%, phosphorus is 0.05 to 0.1%, and the balance is copper and impurities depending on manufacturing conditions. 3. Zinc 0.05 to 0.4%, magnesium 0.02
To 0.3%, 0.02 to 0.2% phosphorus, more than 0% but not more than 0.2% silicon, the balance copper and impurities depending on the manufacturing conditions. 4. Zinc 0.1 to 0.25%, magnesium 0.05
The copper alloy for a continuous casting mold according to claim 3, wherein the copper alloy contains 0.1 to 0.15% and 0.05 to 0.1% phosphorus. 5. A copper alloy for a continuous casting mold according to claim 3 or 4, which contains more than 0 but not more than 0.1% of silicon. 6. Zinc 0.05 to 0.4%, magnesium 0.02
Copper alloy for continuous casting molds, which contains from 0.3% to 0.3%, 0.02 to 0.2% phosphorus, more than 0 but 0.15% zirconium, and the balance copper and impurities depending on manufacturing conditions. 7. Zinc 0.1 to 0.25%, magnesium 0.05
7. The copper alloy for continuous casting molds according to claim 6, containing 0.1 to 0.15% and 0.05 to 0.1% phosphorus. 8. Zinc 0.05 to 0.4%, magnesium 0.02
To 0.3%, phosphorus 0.02 to 0.2%, more than 0 silicon but up to 0.2%, more than 0 zirconium up to 0.15%,
A copper alloy for continuous casting molds, the remainder being copper and impurities depending on the manufacturing conditions. 9. Zinc 0.1 to 0.25%, magnesium 0.05
9. The copper alloy for a continuous casting mold according to claim 8, wherein the copper alloy contains 0.1 to 0.15% and 0.05 to 0.1% phosphorus. 10. A copper alloy for a continuous casting mold according to claim 8 or 9, which contains more than 0 but not more than 0.1% of silicon. 11. Zinc 0.05 to 0.4%, magnesium 0.0
2 to 0.3%, phosphorus 0.02 to 0.2%, the rest is a method for producing a copper alloy for continuous casting molds consisting of copper and impurities depending on the production conditions, hot working after casting the copper alloy,
A method for producing the above copper alloy, which comprises annealing at 300 to 550 ° C. for 1 to 6 hours, and then cold working at least 10%. 12. Zinc 0.05 to 0.4%, magnesium 0.0
2 to 0.3%, phosphorus 0.02 to 0.2%, the rest is a method for producing a copper alloy for continuous casting molds consisting of copper and impurities depending on the production conditions, hot working after casting the copper alloy,
A method for producing the above copper alloy, which comprises performing cold deformation at least 10%, annealing at 300 to 550 ° C. for 1 to 6 hours, and then performing cold working at least 10%. 13. Zinc 0.05 to 0.4%, magnesium 0.0
In a method for producing a copper alloy for a continuous casting mold, which comprises 2 to 0.3%, phosphorus 0.02 to 0.2%, and the remainder copper and impurities depending on the production conditions, hot casting is performed at a temperature above the maximum solubility temperature after casting the copper alloy. Processed and at least 750
Quench from ℃, 1 to 6 at 300 to 550 ℃
A method for producing the above copper alloy, which comprises performing time annealing and then performing cold working for at least 10%.