JPS5924181B2 - glass with metal wire - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a metal wire-containing glass, and more particularly to a metal wire-containing glass that is less likely to cause "line fraying" at the cut end.

Metal wire-filled glass, which is made by enclosing metal wires in the form of a mesh or parallel lines, has the advantage that glass fragments will not fall off even if the glass breaks, and is used in a wide range of applications such as window glass and partition walls. Various shapes are commercially available, including not only a flat plate but also a channel type.

Such glass products containing metal wires are produced by cutting a continuous band into predetermined dimensions, but due to the essential difference in the breaking mechanism of glass and metal, the encapsulated metal wires are cut during cutting. This causes a phenomenon in which the glass peels off from the glass near the cut edge.

At the same time, fine inverted cone-shaped cracks often occur in the glass at the boundary where the encapsulated metal wire is separated from the glass, and these cracks are called "wire cracks."

Glass with metal wires having such lines is more likely to cause thermal cracking after construction than glass without lines.

In other words, thermal stress occurs in glass with metal wires based on the temperature difference that occurs between the center and the edges during use, but the critical thermal stress at which the glass breaks is the same for glass without wires. Experimental results have shown that the average value is about 30 times lower.

Therefore, it is strongly desired that the metal wires encapsulated in the metal wire-containing glass should be resistant to wire fraying during cutting.

In addition, it is desirable to satisfy all of the following conditions.

(1) Must have ferromagnetism.

Thereby, when recovering glass from glass waste containing metal wires, metal wires can be removed by magnetic separation.

(2) The elongation at break after annealing must be small.

This makes it possible to bend and cut glass containing metal wires.

(3) High temperature strength.

(4) No foaming occurs when encapsulating in the glass.

(5) There is no Ar3 transformation within the intermediate temperature range between the temperature at the time of sealing in the glass and the temperature at the time of use of the glass.

This is necessary to prevent glass breakage due to volumetric expansion ζ accompanying transformation.

(6) Resistant to rust in actual usage environments.

The main object of the present invention is to provide a metal wire-containing glass that is less likely to cause line fraying.

Another object of the present invention is to provide a material for an encapsulated metal wire in a metal wire-containing glass that is less likely to cause wire fraying and satisfies all of the above-mentioned conditions.

That is, the encapsulated metal wire of the metal wire-containing glass according to the present invention is made of ferritic stainless steel and has a cross-sectional area of 1
- The average number of crystal grains per grain is 16,384 or more.

Here, the number of crystal grains of the metal wire specified in the present invention is determined strictly when the metal wire is already encapsulated in the glass and at room temperature, which is the environmental temperature at which the metal wire-containing glass is cut. This is a condition that must be satisfied under the following conditions.

In other words, no matter how fine the crystal grains of the metal wire are before being encapsulated in glass that is in a high-temperature softening state, depending on the composition of the metal wire, the crystals may become coarse during the cooling process after being encapsulated, and may become unstable at room temperature. During cutting, the number of crystal grains may fall outside the above range, and in such a case, the desired effect cannot be obtained.

On the contrary, even if the crystal grains of the metal wire before encapsulation are coarse, the desired effect can be obtained as long as the crystal grains are within the specified range of the present invention when cutting the metal wire-containing glass.

The ferritic stainless steel used in the present invention satisfies all of the above-mentioned conditions (1) to 6) desired as a metal wire encapsulated in metal wire-containing glass, and has a crystal grain number within the range of the present invention. If there is, it is difficult to cause line burrs when cutting.

The relationship between the number of crystal grains in a metal wire and the occurrence of line fraying will be explained in more detail.

According to the findings of the present inventors, there is a very large variation in the incidence of wire fraying even in glasses encapsulating metal wires of the same steel type and under the same processing conditions.

When observing this difference in detail, we find that the surface texture near the cut end of the metal wire in glass with metal wires that does not have line fraying is relatively smooth and has minute irregularities, but in glass with metal wires that do have line fraying, the surface texture near the cut edge of the metal wire is relatively smooth. Strong unevenness can be seen at the above-mentioned portion of the line.

Furthermore, the size of the lines that tend to occur is almost proportional to the strength of the surface roughness.

From the above facts, it is believed that the unevenness on the surface of the metal wire that occurs during cutting is largely responsible for the occurrence of wire fraying.

The cause of surface irregularities on metal wires is not fully understood, but wire rods that have undergone intense cold processing during wire drawing are encapsulated in glass and annealed during the slow cooling process. Sometimes, the encapsulated wire is subjected to strong tension, and tensile stress exceeding the yield point is generated near the cut end, resulting in stretcher strain (Stretcher 5tr).
It is presumed that a surface unevenness phenomenon known as ain) or ridging occurs.

The above-mentioned stretcher strain has a crystal grain size of the wire according to Japanese Industrial Standards (Jl5) Go 552-197.
Grain size number 11 according to the comparative method specified in Section 7, that is, the average number of crystal grains in the cross section of the wire is 16,384/rru
The occurrence can be suppressed by making it finer than A.

In adjusting the ferritic stainless steel to the desired crystal grain number according to the present invention, titanium,
A method that prevents crystal grain growth by uniformly dispersing stable fine precipitates that do not dissolve in ferrite at high temperatures by adding components such as vanadium, niobium, and tantalum and combining them with nitrogen or carbon in steel. Well-known metallurgical techniques can be used, such as a method of forming two phases, an α phase and a γ phase, at high temperature, and transforming the γ phase to the α phase or from the γ phase to martensite to refine the crystals upon cooling.

Whichever method you choose, the material of the encapsulated metal wire must be 10
It is important that crystal grain growth is difficult to occur while the material is sealed in glass at a high temperature of 00° C. or higher and cooled to room temperature.

To give a concrete numerical example, C0.05%, 5i105
Mn0.72%, Po015%, 80.193%
, N i O, 15%, Cr 17.95%, Mo1
．． A wire made of ferritic stainless steel containing 0.4% Al, 1.60% Al, and 0.42% Ti is encapsulated in softened glass at a temperature of 1100°C to 1150°C, and the glass containing the metal wire is molded into a rolling roll after a few seconds. Cooled to approximately 800°C, and after another minute, heated to 600°C.
By cooling to about 10°C and then slowly cooling to about 50°C for about 40 minutes, the average number of crystal grains is 16,384/m.
It is possible to obtain metal wire-containing glass having a value of a or more.

Next, examples of the present invention will be described.

Example 5 304 bobbins with different production lofts of US430 wire rods are prepared, and the wire rods are encapsulated in glass in a softened state to manufacture a glass plate containing metal wires. After slow cooling, the glass containing the wire rods of each bobbin is prepared at room temperature. were cut at 20 locations each, and the crystal grain size of the encapsulated metal wire and the presence or absence of line fraying were observed.

The results are shown in Table 1.

In addition, the particle size number in the same table is JISGO552-1977
According to the comparative method according to the regulations, the particle size observed under a microscope with a magnification of 400 times is N (400). This is the numerical value of N (100) determined by the formula.

The number of crystal grains used in the present invention is JISGO552.
It is calculated from the particle size number obtained above using the comparison table of the particle size number and the number of crystal grains and the calculation formula described in -1977.

Next, four types of ferritic stainless steel containing the components shown in Table 2 were used as the material for the encapsulated metal wires, and glasses containing metal wires were manufactured, and they were cut at room temperature to determine the incidence of wire fraying and the crystallization of the metal wires. The particle size, wire surface unevenness, and hardness (HV) were investigated.

The results are shown in Table 3.

From the results in Table 1, it can be seen that when the number of crystal grains in the metal wire becomes finer than an average of 16,384/-, the line fray occurrence rate tends to decrease rapidly, and from the results in Table 3, the finer the crystal grains, the more It can be seen that line burrs are less likely to occur.

In addition, from the results in Table 3, it seems that there is a correlation between the wire fray occurrence rate and the hardness of the encapsulated metal wire, but in a separate experiment, when 5US430 wire was used, even if the hardness was high, Results have been obtained that line cracks are more likely to occur when the crystal grains are coarse.

Claims (1)

[Claims] 1. The metal wire enclosed in the glass is made of ferritic stainless steel, and the cross section of the metal wire is 1rru? A metal wire-containing glass characterized in that the average number of crystal grains per glass is 16,384 or more.