JPS5852014B2 - Kounetsudendouseidouimonozairyou - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a siding, a tuyere cooling surface, a cooling plate, a hot air valve seat, a jacket,
It relates to steel casting materials used in places subject to high temperature loads such as electrode holders.

Conventionally, pure copper castings used in this kind of high-temperature atmosphere have been manufactured by simply adding phosphorus as a deoxidizing agent during the casting process, which tends to cause bubbles, cracks, and cavities, and is not sufficient to maintain soundness. It has the drawbacks of being difficult to process and having low high-temperature strength.

The present invention was invented to solve the above-mentioned drawbacks of conventional materials. Namely, by adding tin, which is easy to alloy, to pure copper, the solidification temperature range is expanded and the amount of solidification shrinkage is reduced. In addition to increasing the high-temperature strength and preventing the occurrence of shrinkage cavities and cracks, adding lithium or magnesium to the conventional deoxidizing agent phosphorus makes it more effective than adding phosphorus alone. Furthermore, by lowering the amount of oxygen, it is possible to prevent the generation of water vapor, which is the cause of bubble generation.

The above addition ratio is 0.08 to 0.4 for tin.
8%, 0.01 to 0.09% for phosphorus, o, ooi to 0.01 for lithium or magnesium
% is appropriate.

A practical example of the present invention will be described below.

Table 1 shows the results of comparative tests of various physical properties when the amount of phosphorus is kept almost constant, 0.005% of lithium or magnesium is added, and the ratio of tin added is varied.

As is clear from the above table, the addition of tin is effective in improving tensile strength and hardness, but has the opposite effect on elongation and electrical conductivity.

In Figure 1, pure copper castings obtained in the same manner were subjected to a high temperature tensile test, and the results are displayed according to the tin addition ratio.

The tensile strength at room temperature and **high temperature increased depending on the addition ratio of tin.

Next, the steel castings obtained in the same manner were processed using the vibration method (ultrasonic erosion device).
Corrosion tests were carried out using 3% NacA, a liquid temperature of 26° C., and a test time of 10 minutes (actual rolling at a depth of 35 mm from the liquid level).

The components and properties of the test piece are shown in Table 2, and the test results are shown in Table 3.

The results of corrosion tests also show that the cast material according to the present invention is superior to conventional materials.

**
Table 4 shows the measured oxygen content, which is largely involved in pore formation.

The measurement was performed using a KT-type water oxygen analyzer in metals by placing the sample in an N1 bath and melting it.

As described above, the alloy of the present invention has the effect of greatly reducing the oxygen content involved in pore formation compared to conventional materials, and was able to reduce cavities in castings.

Next, the influence on the thermal conductivity of the material of the present invention will be shown.

It has been found that addition of lithium or magnesium within the range of the present invention does not affect thermal conductivity.

It was found that the amount of phosphorus and tin added affects the thermal conductivity.

Figures 2 and 3 show the independent effects of phosphorus and tin on the thermal conductivity, and Figure 4 shows the heat transfer coefficient of the material of the present invention as a function of the addition ratio of phosphorus and tin and the temperature. This is what is displayed.

As is clear from the above various tests and measurements, the material of the present invention has increased strength at room temperature and high temperature compared to conventional casting materials, and has extremely low oxygen content, which causes pore formation, resulting in cracks and This prevents the formation of cavities and pores, and produces corrosion-resistant and highly sound copper castings.
, 3 and 4, and Fig. 1, and determine and combine the additive components within the scope of the present invention, high thermal conductivity can also be achieved, and industrially, it will be possible to achieve an advantage that has not been practical in the past. It is effective in providing characteristics.

[Brief explanation of the drawing]

Figure 1 is a straight line diagram showing the relationship between tensile strength and temperature of pure copper castings, Figures 2 and 3 are curve diagrams showing the influence of the amounts of phosphorus and tin on the thermal conductivity of pure copper castings, and Figure 4. is a curve diagram showing the influence of simultaneous addition of phosphorus and tin on the thermal conductivity of copper castings.

Claims (1)

[Claims] 1 Main component is copper, plus 0.08 to 0.48% tin,
A high thermal conductivity steel casting material, characterized in that it is cast by adding 0.01 to 0.09% of phosphorus and further adding 0.001 to 0.01% of lithium or magnesium.