JPH07257686A - Joining method of corrosion-resistant metal lining material and lined tanks - Google Patents

Abstract

PURPOSE:To provide a joining method for a corrosion-resistant metal lining material, which is simple and strong, and a joining structure of lined tanks for tower tanks which are mainly used for the reaction under normal or low pressure, separation and storage, etc., of corrosive chemicals for chemical industry. CONSTITUTION:A plurality of openings are formed on a base material 1 made of a steel product with a specified interval. Then, a engaging member 6 consisting of a protuberance, which engages with a corrosion-resistant lining material 2 at the location corresponding with the opening is formed. Then, the base material 1 and lining material 2 are joined by flow-filling and then hardening a fusible alloy in a cavity 10 of a two layer material wherein the opening and engaging member 6 are fitted and put together.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention mainly relates to the corrosion resistance of the liquid contact surface of the base material of the column tanks used for the reaction of corrosive chemicals under normal pressure or low pressure, separation storage, etc. in the chemical industry. Corrosion resistance that can be used when the lining material is thinned and used, such as lining tanks lined with thin metal plates, lining containers, large diameter pipes, gutters (hereinafter abbreviated as lining tanks) The present invention relates to a method for joining metal lining materials and lining tanks.

[0002]

2. Description of the Related Art 1) Carbon steel and stainless steel are used for large-capacity column tanks used for reaction, separation, storage, etc. of highly corrosive acids, alkalis, salts and other chemicals under normal pressure or low pressure. A tank made of steel such as steel as the base material, lined with rubber or resin on the inner surface. 2) A plastic tank made of a corrosion-resistant resin plate such as vinyl chloride or polyethylene. A fiber reinforced thermosetting resin layer is formed to reinforce the mechanical strength, 3) A plastic tank molded with a resin such as polyethylene is wrapped with a stainless steel plate or the like to supplement its mechanical strength, Etc. are generally used.

However, in order to manufacture a tank that requires corrosion resistance, it is preferable to use a corrosion-resistant metal plate itself represented by titanium in terms of workability and weldability, but it is manufactured from a titanium material itself. There are only a few things. The main reason why the above rubber lining or plastic tank is used is that the corrosion resistant metal material represented by titanium is expensive.

[0004]

Titanium materials, which have excellent corrosion resistance, have been widely used because of their excellent corrosion resistance. However, since it is impossible to weld the base material steel sheet in a normal state, as a lining material for pressure vessels, etc., a titanium clad steel material joined to the steel sheet by the explosive pressure bonding method or the pressure rolling method, or JP-B-56- As proposed in No. 22422, the shape of a special titanium clad steel material, etc., which is soldered on the surface of a steel plate, laminated with copper mesh and stainless steel on one side of a titanium material, and superposed and welded by electric resistance seam welding. However, as with titanium alone, various titanium clad steels have not been applied to general lining tanks other than pressure vessels because of the high processing cost and high cost.

On the other hand, the durability of rubber or resin lining tanks and reinforced plastic tanks against corrosive chemicals is, for example, the life of rubber linings for chlorine-dissolved hot saline solution in the soda industry is about 5 years, and the oxidizing power is strong. The life of reinforced plastics for sodium hypochlorite solution is said to be about 10 years, which is quite long, but it is short-lived compared to the durability of titanium. Along with this, especially for construction work, clean up residual liquid at the bottom of the tank, disconnect the piping,
The complexity of securing construction space has always been a problem.

The present inventor aims to solve the above problems of corrosion resistant tanks used under normal pressure or low pressure, and uses titanium, which has a permanent life, as a lining material, and the above-mentioned clad that is costly. As a result of pursuing a means for economically lining a steel sheet as a base material instead of steel, the present invention has been completed here.

[0007]

That is, a method of joining a corrosion-resistant metal lining material according to the present invention is to form a plurality of openings at predetermined intervals in a base material made of steel, An engaging member consisting of a protrusion that engages with a position corresponding to the opening is formed, and the fusible metal is flown into the void of the two-layer material formed by fitting the opening and the engaging member and solidified after filling. A method of joining a corrosion-resistant metal lining material, which comprises joining the base material and the lining material.

The structure of the lining tanks obtained by the above method comprises a base material 1 of a lining tank having an opening 4 and a lining material 2 in which a protruding engaging member 6 engaging with the opening 4 is joined. A lining tank in which a space 10 of a two-layer plate in which an engaging member 6 is fitted in the opening 4 and overlapped with each other is filled with a fusible metal 11 and the lining material 2 is joined to the base material 1. is there.

Specifically, the base material 1 for lining tanks
Is a steel plate such as carbon steel or stainless steel, and the lining material 2 is a corrosion-resistant metal plate that cannot be welded to a base material such as titanium, tantalum, niobium, or zirconium.
11 is a lining tank using an alloy whose main component is blue lead.

To apply titanium to a lining material such as a lining tank, a lining container, a lining pipe, or a lining gutter that is used under normal pressure or low pressure, swelling due to peeling from the base material such as rubber or resin Since there is no problem that causes corrosion of the base material such as cracks and cracks, it is not necessary to adhere it to the base material that is responsible for mechanical strength, so-called loosely attached strip lining is sufficient, and the thickness of the titanium plate is tank Since it is not necessary to withstand the load of internal chemicals, the minimum thickness required for welding is sufficient, and by locally joining the titanium thin plate to the important points of the steel plate that is the base material, virtually permanent corrosion resistance is achieved. The lining tanks that it has are provided economically.

[0011]

As described above, since the base material generally made of steel has a large plate thickness, it is economical to give the strength of the lining tanks and to make the corrosion resistant lining material as thin as possible. According to the above-described joining method of the present invention, in the opening portion of the thick base material, the engagement protrusion is formed of a material that can be welded from the thin plate lining material, and the empty space of the fitting portion in which the engagement protrusion is fitted. By injecting fusible metal into the place and filling and solidifying it, it is possible to carry out a strong joint that is never separated by a simple operation.

This method is extremely useful when applied to lining tanks, and in this case also, the action obtained by the above method, that is, the side surface of the base material opening of the joint 3 between the base material and the lining material of the present invention The groove 5 and the cutout portion 7 of the engaging member joined to the lining material act as a hook for joining both members with the inclusion of the fusible metal filled in the void of the joining portion 3. In addition, the solidification and swelling property of the fusible alloy containing bluish as a main component has a function of pulling out a firm bonding force without loosening by a caulking function of crimping a contact surface with a bonding member.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The concrete means of the present invention will be described below with reference to the accompanying drawings. However, although titanium is represented as the lining material for the tank as the corrosion-resistant metal material, the present invention is not limited to titanium, and as described above, tantalum, niobium, zirconium, or
It can also be applied to corrosion resistant metals similar to these.

FIG. 1 is a vertical sectional view of a cylindrical or prismatic titanium lining tank of the present invention. In the figure, reference numeral 1 is a steel plate serving as a base material, reference numeral 2 is a titanium plate serving as a lining material, and reference numeral 3 is a joint portion between the base material and the lining material. As is clear from the figure, this lining tank has a structure in which the tank formed of the base material 1 is inserted into the tank formed of the lining material, and the two are locally joined at the joint portion 3. . The base material of the tank is mainly rolled steel for general structure specified in JIS, and a steel plate with a thickness of 3.2 mm or more is used, although it depends on the size and height of the tank. On the other hand, as the titanium plate which becomes the lining material 2 of the tank, a corrosion-resistant titanium plate defined by JIS H4600 having a thickness of 0.8 to 1.2 mm is applied.

The number of the joints 3 is difficult to determine depending on the size of the material plate forming the tank, the difference in the side and bottom surfaces, the difference in the flat surface and the curved surface, the processing method, etc. In the case of (1), it is sufficient that the number is such that there is no hindrance such as disbonding mainly in the process of manufacturing the tank, and it is sufficient to arrange at ^{2 to} 4 places per 1 m ² at a pitch of 500 to 1000 mm. The required amount of fusible metal per joint is approximately 40 to 80 g, and the price is relatively low because it is an alloy of tin, lead, etc. containing blue lead, so economical conditions are required. I am satisfied enough.

FIG. 2 is an explanatory view showing the details of the connecting portion 3 shown in FIG. 2 (a) is a cross-sectional view of the joint portion of the base material 1,
The opening 4 is formed by a tool such as a drill, and the groove 5 is provided on the side surface of the opening by a tool such as a boring head. The diameter of the opening 4 is approximately 30 to 40 mmφ, and the groove 5 is a V-shaped or U-shaped groove having a width of 2 to 3 mm and a depth of 2 mm. , 9 to 15 mm, 2 lines, 16 mm or more, 3 lines.

FIG. 2 (b) is a sectional view of the joint portion of the lining material 2. The titanium plate of the lining material is provided with the engaging member 6 on the surface of the base material 1 made of a steel plate which is in contact with the opening 4. . The engagement member 6 is a titanium ring having a thickness of 1.5 mm and an outer diameter of approximately 20 to 30 mm, which is approximately equal to the thickness of the base metal, and the width of 5 to 8 mm and the height of the titanium ring are divided into four parts that divide the circumference at one end into four equal parts. A notch 7 having a height of about 1/2 is provided and spot welded to a titanium plate by a TIG welding at a welded portion 8 or 8'in the drawing.

FIG. 3 shows a method in which the opening 4 of the base material 1 shown in FIG. 2 is fitted to the engaging member 6 of the lining material 2, the base material is superposed on the lining material, and both plates are joined by a fusible metal. FIG. That is, the titanium plate of the lining material 2 is placed substantially horizontally with the engaging member 6 facing upward as shown in FIG. Next, the steel plates of the base material 1 are overlapped with each other with the sealing material 9 interposed therebetween such that the center of the opening 4 coincides with the center of the engaging member 6. Normally, the sealing material 9 is not necessary because the gap between the lower edge of the opening 4 of the base material 1 and the lining material 2 is 0.2 mm or less, which is extremely small unless the plate surface is deformed such as warping. If a gap of 0.5 mm or more is generated, the sealing material 9 is placed on the lower edge of the circumference of the opening to seal the gap. A silicone sealant having excellent heat resistance, workability, and sealability is applied to the seal material 9. In the space 10 at the joint between the base material 1 and the lining material 2 thus formed,
The fusible gold 11 melted with the lining material 2 below and the base material 1 above is injected and solidified by cooling.

FIG. 3 (b) is a sectional view of the joint portion showing the state of the fusible metal 11 which is filled in the joint portion space 10 and solidified. Binary or ternary alloys of tin and / or lead whose main component is volume expansion upon solidification are mainly applied to the fusible alloy, but it is an alloy containing a third or fourth component such as antimony. It does not matter if there is. The melting point of fusible gold that solidifies and expands depends on the composition ratio, but it is 90 from the viewpoint of workability and practicality.
It is preferably from ℃ to 140 ℃. The molten fusible alloy is preferably charged after heating the ambient temperature of the opening 4 of the base material to near the melting temperature with a gas burner or the like. Instead of injecting the molten fusible metal, a predetermined amount of the granular fusible metal may be arranged in advance in the opening, and then the alloy and the periphery of the opening may be heated and melted.

The fusible metal 11 filled in the void of the solidification joint portion in FIG. 3 (b) has a void 10 including the groove 5 of the base material opening and the notch 7 of the engaging member 6 of the lining material. It completely fills and the surface is rounded up due to the surface tension as shown in the figure, and it solidifies neatly at approximately the same level as the surface of the base material, so finishing work such as chamfering the solidified surface is not necessary.

The most important joining force of the lining material to the base metal is the groove 5 on the side surface of the lining material opening and the notch 7 of the engaging member attached to the lining material 2.
The solidified fusible gold 11 is firmly engaged by the hooking action, its tensile strength is 200 Kgf or more and shear strength is 1000
Since it is Kgf, the joint will not be easily broken even with the impact such as impact and load that may be received in the process of manufacturing the tank. Under the usage conditions after completion of manufacturing, the stress applied to the joint is a load corresponding to the tension due to the difference in expansion / contraction ratio of each material due to temperature change and the head pressure of the chemical liquid in the tank. As is clear from b), the hydraulic load is applied to the weld 8 between the engaging member and the titanium plate.
Since it is not directly applied to, the problem of fracture is practically negligible.

The strength test of the present invention will be described in detail below. For the purpose of testing and confirming the joining force of the joining portion 3 of the titanium lining tank of the present invention, the following test piece was manufactured, and after the fusible gold joining, the joining portion was subjected to a tensile and shear test. Steel plate 6 mm thick, 100 mm long, 100 mm wide (SS40
Make a hole with a diameter of 30 mm in the center of (0) and have a width of 3 on the circumference of its side.
A V-shaped groove having a depth of 2.5 mm and a depth of 2.5 mm was cut to prepare a test piece of a base material joint portion corresponding to FIG. On the other hand, thickness 1mm, length
Outer diameter 22m at the center of titanium plate (TP35H) of 90mm, width 90mm
m, inner diameter 19 mm, length 10 mm titanium pipe (equivalent to material TP35H)
Engagement member 6 (hereinafter referred to as an engagement ring) in which a notch 7 having a width of 5 mm and a length of 5 mm is cut at each position that divides the circumference of one end into four equal parts.
However, the test piece of the lining material joint part corresponding to FIG. 2 (b) was prepared by joining the titanium plate by TIG welding at the four sides that contact the titanium plate at the notched edges.

A rubber ring having a thickness of 2 mm, an outer diameter of 60 mm and an inner diameter of 50 mm is prepared, and then the titanium plate is placed horizontally with the engaging ring (engaging member) facing upward, and the rubber ring is placed on the engaging ring. The steel plate was placed on the titanium plate so that the opening was aligned with the center of the engaging ring as shown in FIG. 3 (a), and both plates were fixed by a tightening jig. This is because the rubber ring having a thickness of 2 mm intentionally forms a gap in consideration of the possibility of forming a gap between the base material and the lining material in the actual manufacturing process of a large lining tank. The 2 mm gap between the lower edge of the opening of the steel plate thus formed and the titanium plate was sealed with a silicone sealant (trade name of Shin-Etsu Chemical Co., Ltd.).

Next, 52% blue lead and 48 tin prepared in advance
%, 200g of fusible metal with melting / freezing point of 138 ℃ is put in a cast iron bottle with an injection port, heated to 160 ℃ on an electric heater and melted, and the steel plate around the joint of the test piece is heated to a torch lamp at a surface temperature of about 150 ℃. After being heated to, the filling was performed up to the upper edge of the opening. In this way, the surface of the meltable fusible metal filled in the joint space 10 is raised by about 0.5 mm from the contact interface between the steel plate and the titanium ring due to the surface tension during melting and the volume expansion during solidification. It was left to cool naturally and solidified.

Three pairs of joining test pieces were manufactured in the same manner as described above, one pair was cut perpendicularly from the center of the joining portion and a cross-section was observed. One pair was a tensile tester on the steel plate surface and titanium surface on the front and back of the joining portion. Attach a handle jig for gripping to the vertical direction in the horizontal direction, centering on the joint part of the titanium plate, in accordance with the tensile test in the horizontal direction for the other pair in accordance with the shear test jig specified in JIS. Was cut into 40 mm square and then subjected to a shear test.

As a result of the above, the fusible metal in the cross section of the joint portion corresponding to FIG. 3 (b) completely fills the void 10 of the joint portion and no gaps due to bubbles etc. are seen at all, and the seal is made by the silicone sealant. There was no phenomenon such as penetration from the portion 9 into the 2 mm gap between both plates. The following values were obtained for the tensile strength and the shear strength, and it was confirmed that there was no problem in practical use. Tensile strength 320 Kgf Shear strength 1010 Kgf At the break point, the former is the fusible metal filled in the groove of the steel plate opening, and the latter is the point welded part between the engagement ring and the titanium plate. There wasn't. Moreover, the weight of the fusible metal per one joint was about 44 g.

Next, a specific example in which the present invention is applied to a lining tank will be shown. An arc-shaped two-layer plate was produced by laminating a titanium plate on a steel plate, which is a material for the side wall of a titanium lining tank having an inner diameter of 3600 mm, a height of 4000 mm, and a volume of 40 m ³ , and locally joining the plates. The rolled steel for welded structure, which is the base material, is made of material JI.
S GSM400, steel plate with thickness 6 mm, width 1000 mm, length 2000 mm, lining material JIS TP28, thickness is
Using a titanium plate having a width of 1.2 mm, a width of 980 mm, and a length of 1980 mm, a titanium layer of a two-layer plate obtained by stacking the two plates by a roll forming machine was bent into a curvature corresponding to the inner diameter of the tank. The titanium plate side engaging ring was manufactured in exactly the same size and manner as in Example 1. Fusible gold is composed of Bi56%, Sn22%, Pb22
%, Melting start temperature 95 ° C, melting end temperature 104 ° C,
300g was prepared in a fusible financial solution pot with an electric heater, inlet and handle. In addition, a silicon sealant manufactured by Shin-Etsu Chemical, which was set in an extruder for sealing the joint, was prepared.

The connecting portion 3 of the two-layer plate, in which a bent steel plate and a titanium plate are overlapped with their diagonals aligned, has a horizontal line that divides a width of 1 m of the steel plate into four equal parts and a vertical line that divides a length of 2 m into eight parts. Of the intersections of the lines, one of the horizontal lines based on one corner
6 points of intersection between the 3rd and 3rd lines and the 2nd, 5th, and 8th lines of the vertical lines, that is, a vertical pitch of 500 mm,
Horizontal pitch is 750 mm, diameter is 30 mm by drilling on steel plate
Open the opening 4 on the side and form a groove 5 on its side with a depth of 1.5 m.
Grooves with m and pitch of 3 mm were cut by a boring head. The engagement ring 6 was attached to the titanium plate by TIG welding in alignment with the center of the joint facing the opening of the steel plate.

The following were prepared as jigs for welding fusible metal joining of a two-layer plate in which a bent titanium plate and a steel plate were superposed. That is, the surface area is the same as the steel plate dimension, the width is 1 m,
A rubber-tensioned steel pedestal that is 2 m long and has a curvature that matches that of the titanium plate is equipped with a rotation mechanism that can adjust the joint 3 to a horizontal position. A jig was prepared.

The above-mentioned bent titanium plate and steel plate were joined in the following order. 1) A titanium plate was placed at a predetermined position on a pedestal, steel plates were superposed on it, and fixed with a tightening jig. 2) At the center of the surface of the titanium plate exposed through the six openings 4 of the steel plate, an engaging ring 6 is formed in the same manner as the test piece.
TIG welded. 3) There are almost no gaps between both plates in the opening 4 at 0.
Although it was 2 mm or less, a silicone sealant was applied to the lower edge of the opening just in case. 4) The pedestal is rotated, and the openings in 2 places / row x 3 rows are
One row of openings 4 was positioned substantially horizontally. 5) The fusible metal in the melting pot was heated to 140 ° C and melted in a hot water form. 6) Approximately 60mmφ range around the opening 4 of the steel plate
Two locations were heated at 100 ° C. with a torch lamp at the same time. 7) From the injection port of the melting pot, the fusible gold melt was poured into the space 10 at the joint to the level of the steel plate surface, and then allowed to cool naturally. 8) After a few minutes, the fusible metal began to solidify, and due to the surface tension and volume expansion, it solidified in a state of being raised by about 0.5 mm from the surface of the steel sheet. 9) In the same manner, the fusible gold bonding of the other two places / row × 2 rows of openings was performed to complete the joining of the two-layer plate. 10) After this, it was removed from the pedestal and a gap inspection of the two-layer plate and a percussion inspection of the joint part were performed. As a result, the gap on the outer periphery of the two-layer plate was 0.5 mm or less, and no abnormality was found in the joint.

As described above, a titanium-lined steel plate, which can be used as a material for the side wall of a cylindrical tank that can replace the titanium clad steel plate, was completed. Needless to say, the titanium lining steel plate, which is the material for the flat bottom surface of the tank or the wall surface of the rectangular tank, can be more easily manufactured. Thus, it was confirmed that a titanium lining tank could be manufactured.

[0032]

When the method of joining the corrosion-resistant metal lining material of the present invention is applied to, for example, a lining tank, the amount of the expensive corrosion-resistant metal material used can be minimized, and a simple joining method replacing the expensive clad processing can be obtained. The titanium laminated steel plate can be formed as a raw material, and the life thereof is more permanent than that of the rubber or resin lining or the reinforced plastic tank, so that an overall excellent economic effect can be brought about.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a cylindrical or square tank showing a structure of a lining tank of the present invention.

FIG. 2 (a) of a lining tank of the present invention is a base material,
FIG. 4 is a cross-sectional view showing the structure of each joining portion of the lining material.

FIG. 3 is a cross-sectional view showing (a) a state in which a base material and a lining material are joined together and (b) in which a fusible metal is filled in the lining tank of the present invention.

[Explanation of symbols]

 1 Base Material 2 Lining Material 3 Joint of Base Material and Lining Material 4 Opening 6 Engagement Member 9 Sealing Material 10 Vacancy 11 Fusion Fusing

Claims (3)

[Claims] 1. A plurality of openings are formed at a predetermined interval in a base material made of steel, and an engagement member made of a projection is formed on a corrosion-resistant lining material at a position corresponding to the openings. A corrosion-resistant metal lining material, characterized in that the base material and the lining material are joined by injecting fusible gold into the voids of the two-layer material in which the opening and the engaging member are fitted and overlapped and then solidified. Joining method. 2. The engaging member 6 is provided in the opening 4 with a base material 1 of a lining tank having the opening 4 and a lining material 2 to which a protruding engaging member 6 engaging with the opening 4 is joined. A lining tank in which a vacant space 10 formed by fitting and superposing two layers of fusible metal 11 is filled and a lining material 2 is joined to a base material 1. 3. The base material 1 for lining tanks is carbon steel,
It is a steel plate such as stainless steel, the lining material 2 is a corrosion-resistant metal plate that cannot be welded to a base material such as titanium, tantalum, niobium, or zirconium, and the fusible metal 11 is an alloy whose main component is blue lead. The lining tank according to claim 2.