JPS6330187A - Manufacture of corrosion resistant bimetal plate - Google Patents

Abstract

PURPOSE:To form the corrosion resistant bimetal of high quality having high adhesion strength by projecting a laser beam on each plate composing the bimetal and performing a cold pressure-welding by opposing the surface of the irradiation layer each other. CONSTITUTION:An irradiation layer 7 is formed by projecting a laser beam with a laser beam projecting device 2 on the both main faces of a high expansion side alloy plate 1 and low expansion side alloy plate 11, and on one main face of an austenitic stainless steel plate 10 and ferritic stainless steel plate 12. These plates are overlapped in the prescribed order, the irradiation layer 7 is opposed and after a bimetal plate 13 is formed by pressure-welding it with a rolling roll 8, a diffusing annealing, intermediate cold rolling, process annealing and finishing rolling are performed. The adhesion is thus improved by the cleaning of the adhesion face and the solidification with melting on the polar surface, the interatomic bonding is easily obtd. and the corrosion resistant bimetal of high quality having high adhesion strength can be formed.

Description

[Detailed Description of the Invention] Field of Application The present invention relates to a method for manufacturing bimetal plates with a four-layer structure and a five-layer structure, in which the surfaces irradiated with a laser beam applied to each laminate are faced to each other and cold pressure welded. The present invention relates to a manufacturing method for obtaining a bimetal plate with excellent surface quality and adhesion strength.

BACKGROUND TECHNOLOGY In general, a two-layer bimetal consisting of a high-expansion alloy plate and a low-expansion alloy plate is used for parts for thermal control equipment, etc.
In addition, a three-layer bimetal in which an intermediate layer alloy is interposed between a high expansion side alloy and a low expansion side alloy is used for current breakers, etc., but in order to improve corrosion resistance, the high expansion side alloy 18- whose coefficient of thermal expansion approximates that of the outer surface of the alloy plate
A corrosion-resistant bimetallic plate with a four-layer structure or a five-layer structure is used, in which an 8-series austenitic stainless steel plate is adhered, and a 13Cr-based ferrite stainless steel plate with a thermal expansion coefficient similar to that of the low-expansion alloy is adhered to the outer surface of the low-expansion alloy. Manufactured using a similar process.

As an example, to explain a method for manufacturing a bimetal with a four-layer structure, first, while unwinding an austenitic stainless steel sheet coil, a high expansion side alloy coil, a low expansion side alloy coil, and a ferritic stainless saw blade coil, After cleaning by a mechanical polishing method such as a wire buff, four sheets of the press-welded materials are piled up and simultaneously cold-welded, followed by diffusion annealing, intermediate cold rolling, intermediate annealing, and final cold rolling.

However, in mechanical polishing such as wire buffing, there is a risk that micro-cracks, scaly metal powder, and foreign matter may remain on the surface to be polished, which is to be pressure-welded. At this time, metal powder and other foreign matter are entrapped in the press-contact surfaces, resulting in a problem in which the bimetallic plate peels off as the press-contact strength decreases.

Purpose of the Invention The present invention provides a method for cleaning by mechanical polishing the surfaces of high-expansion side and low-expansion side alloy plates and the surfaces of each press-welded material plate of an austenitic stainless steel plate and a ferritic stainless steel plate in a conventional manufacturing method of a corrosion-resistant bimetal plate. The purpose of the present invention is to provide a manufacturing method that solves the problems caused by the above problems, improves the pressure welding strength, and produces corrosion-resistant bimetallic plates with four-layer and five-layer structures of excellent quality.

Structure and Effects of the Invention The present invention provides a method for manufacturing a corrosion-resistant bimetallic plate, in which the outermost surface of the austenitic and ferritic stainless steel plate, the high-expansion side and low-expansion side alloy plates, and the surface of the intermediate layer metal plate are cleaned. As a result of various studies aimed at improving the crimp strength between materials and improving the quality of bimetal plates, we have found that at least one laser beam is applied to the surface of the material plate to be pressed in a zigzag, meandering or striped manner on the surface of the material plate to be pressed while traveling. By irradiating a laser beam with a wavelength that is easily absorbed by foreign matter, oil, fat, and moisture that cause bonding defects, the foreign matter, oil, and moisture adhering to the surface absorb the laser beam and release gas. oxidized and removed, a clean surface is obtained, and furthermore, when the pressure-welded material plates are pressed together,
Because the surface is clean, interatomic bonds easily occur, and for practical purposes,
It has been found that sufficient pressure contact strength can be obtained without causing any problems.

Furthermore, wavelengths that are easily absorbed not only by foreign substances, but also by austenitic and ferritic stainless steel plates, high-expansion side and low-expansion side alloy plates, and intermediate layer metal plates, that is,
If a laser beam with a wavelength of 5 μm or less is used, 10 pm
Below, the very surface layer, preferably on the submicron order, is
A hardened layer is formed by melting and solidifying, and during cold welding of each pressure welding material, fine cracks are generated on the surface of the hardened layer on the surface of the substrate due to internal sliding deformation, exposing the new internal surface and bonding the two together. It is possible to significantly improve the adhesion strength between the metal plates or each press-welded material plate, and to prevent surface cracks, generation and adhesion of metal powder and residual foreign matter caused by conventional mechanical polishing such as wire buffing, and to improve the pressure-welding strength. It was discovered that a corrosion-resistant bimetallic plate with high corrosion resistance and excellent quality could be obtained.
This invention has been completed.

That is, in the case of a four-layer corrosion-resistant bimetallic plate, the present invention provides a method for manufacturing a bimetallic plate in which an austenitic stainless steel plate, a high expansion alloy plate, a low expansion alloy plate, and a ferritic stainless steel plate are pressure welded. At least one laser beam is irradiated on the entire main surface of the stainless steel plate and the ferritic stainless steel plate, and on the entire main surfaces of the high expansion machine side alloy plate and the low expansion side alloy plate, and the austenitic stainless steel plate, A corrosion-resistant bimetallic plate characterized in that a high-expansion side alloy plate, a low-expansion side alloy plate, and a ferritic stainless steel plate are cold-welded with the surfaces of the irradiated layers formed by the irradiation of each plate facing each other in this order. This is the manufacturing method.

In addition, in the case of a 5-polish structure corrosion-resistant bimetal plate, a high expansion side alloy plate and a low expansion side alloy plate, and an austenitic stainless steel plate and a ferritic stainless steel plate are laminated and pressure-welded on the outer surface of the high expansion side alloy plate and the low expansion side alloy plate, respectively, with an intermediate metal plate interposed. In the manufacturing method, the entire main surface of the high expansion alloy plate and the low expansion alloy plate, the entire main surface of the intermediate layer metal plate, and the entire main surface of the austenitic stainless steel plate and the ferritic stainless steel plate are , irradiating with at least one laser beam, sandwiching an intermediate layer metal plate having an irradiation layer formed by the irradiation on both main surfaces, and placing the irradiation layer surfaces of both metal plates facing each other, and further increasing the high expansion side. A corrosion-resistant bimetal characterized by cold-pressure welding the irradiated layer surface of an austenitic stainless steel plate to the other irradiated layer surface of the alloy plate, and the irradiated layer surface of a ferritic stainless steel plate to the other irradiated layer surface of the low expansion side alloy plate, respectively. This is a method of manufacturing a board.

Preferred Embodiment of the Invention In this invention, the high expansion alloy contains 17wt% to 26wt% Ni, 2.5wt% to 12wL% Cr, and 5wt% to 7wMn.
t%.

Fe alloy containing one type of M, 3 wt% to 7 wt%, or Mn 70 wt% to 80 wt%, Ni 5 wt% to:
Mn alloy with 15 wt% content and balance Cu, low expansion alloy contains Ni35 wt%-50 wt% or Cr13 wt%-1
An Fe alloy containing 8 wt% can be used.

In this invention, the high expansion side Fe alloy has Ni of 1? lol
If it is less than t%, the coefficient of thermal expansion becomes too small;
If it exceeds wt%, the coefficient of thermal expansion becomes too small, which is not preferable. In addition, Mn is less than 5 wt% and Cr is 2.
If the content is less than 5wt% and Mo3wt% is less than 1%, it is unfavorable in terms of the stability of high expansion properties.If Mn exceeds 7w7%, corrosion resistance will deteriorate, and if Cr exceeds 12wt% or Mo is 7wt%. Exceeding this is not preferable because workability deteriorates.

Therefore, the high expansion Fe alloy contains 17 wt% to 26 wt% Ni and 5 wt% to 7 wt% Mn.
% or Cr 2.5wt%-12wt% or Mo
Fe alloy containing one type of 3wt% to 7wt%, especially Ni19-2l-Cr5.0-7.0-Fe alloy (w
t%), Ni 19.0-23 Cr 2.5-5.
0-Fe alloy (wt%), Ni 17.0-20.0-
Cr 10.0-12.0-Fe alloy (wt%), Ni
23-27-Mo 3.0-7.0-Fe alloy (wt%
), Ni 19.0-24.0-Mn 5.0-7.0
-Fe alloy (wt%) is preferred.

In addition, Mn70 is a Mn alloy that can obtain a high coefficient of expansion.
A Mn alloy with wt% to 80wL%, N15wt% to 15wt%, and the balance Cu is preferable.

In addition, the low expansion side Fe alloy contains less than 35 wt% Ni and C
When r is less than 13 wt%, the thermal expansion coefficient becomes too large, and when N1 exceeds 50 wt% and Cr is 18 wt%,
If it exceeds 35wt% to 50wt% of Ni, or Cr.
Fe alloy containing 13wt% to 18wt%, amber alloy, Ni38wt%-Fe alloy, Ni42wt%-F
e alloy and Cr1318wt%-Fe alloy are preferred.

In order to adjust the electrical resistance of the bimetallic plate, the intermediate metal plate may be appropriately selected from Ni alloy or Cu alloy depending on its use.

The outermost austenitic stainless steel plate that is pressed against the high expansion side alloy plate is 18-8 series 5US301, SU
Materials such as S302, SUS304, and SUS316 are preferable.

In addition, as the outermost ferritic stainless steel plate that is pressed against the low expansion side alloy plate, 13% Cr-based 5US430,
The material is preferably SUS 410.

In this invention, the laser beam irradiation method is such that a spot-shaped beam is directed two-dimensionally onto the surface of each material plate to be pressure-welded using a mirror, or a lens or mirror is used to spread the beam and The beam is irradiated all at once in the width direction, uniformly irradiating the entire surface of the surface to be adhered, or the beam is irradiated in a zigzag or meandering manner over the surface to be adhered.
Partial irradiation is performed in a striped manner.

In addition, in this invention, the surface condition of each alloy plate, intermediate layer metal plate, and each stainless steel plate partially irradiated with a laser beam is as described above, with a hardened layer formed by cleaning the irradiated surface and melting and solidifying the extreme surface layer.・The surface of the non-irradiated area is also cleaned due to the thermal influence of the surrounding irradiated area. Therefore, when the material plates to be pressure-welded are cold-welded with the laser beam irradiation layer surfaces facing each other, as described above, the material plates to be pressure-welded are firmly bonded in the irradiated area, and the surfaces of the non-irradiated areas are also clean. As a result, the adhesion between each material is improved and sufficient pressure bonding strength can be obtained.

In this invention, the laser beam irradiation is sufficient as long as it can remove deposits, oil, and moisture from the surface, and preferably 1
Any method may be used as long as it is possible to melt and solidify the extreme surface layer of 0 μm or less. For example, the beam may be focused into a spot and irradiated in a direction perpendicular to the surface of the alloy plate, or the alloy plate may be fused with a laser beam. It is possible to adopt methods such as moving the laser beam in the same or opposite direction along the length of the plate, or moving the laser beam in the longitudinal direction of the plate while vibrating the laser beam in the width direction of the plate.

Alternatively, a method may be adopted in which the laser beam is oscillated from a laser oscillator, focused by a collimator and a lens, and guided to a desired position by an optical fiber for irradiation.

In this invention, the laser beam irradiation conditions are as follows:
Beam power density is 100kW/mm2 to 1500
A range of kW/mm2 is preferred, more preferably 3
00kW/mm2 to 900kW/mm2.

If the power density of the laser beam is less than 100kW/mm2, there will be no surface cleaning effect on the material plate to be welded, and if it exceeds 1500kW/mm2, the surface will become extremely uneven, and as the power density increases, holes will occur in the plate. is generated, which is not desirable.

Further, it is effective if the laser wavelength is 511 m or less, but if it exceeds 2 pm, the absorption effect on the alloy plate decreases, so it is desirable to use a wavelength of 2 pm or less.

Furthermore, in order to improve the irradiation efficiency of the laser beam, before irradiating the Cr surface of the high expansion side alloy plate, both main surfaces of the intermediate layer metal plate, and one main surface of the austenitic and ferritic stainless steel plates with the laser beam, It is preferable to preheat to 200°C to 500°C in a non-oxidizing atmosphere.

DISCLOSURE OF THE INVENTION BASED ON DRAWINGS FIG. 1 is a perspective explanatory view showing irradiation of a laser beam onto an alloy plate according to the present invention. FIGS. 2 and 3 are explanatory diagrams of material plates to be welded by pressure, showing cold welding according to the present invention.

The high expansion side alloy plate (1) coil is unwound and advances toward the laser beam irradiation device (2). The laser beam irradiation device (2) consists of an irradiation box (3) and an oscillation device (4) for irradiating a laser beam onto -, 11m of the passing alloy t112 (1).
3) has a configuration in which the entire alloy plate (1) is surrounded and Ar gas is vented inside, and a laser beam can be irradiated in an Ar gas atmosphere.

For example, in the oscillator (4), the laser beam
The YAG laser oscillates from a laser oscillator, passes through a collimator, is reflected at a required angle by a galvanic mirror (5), is focused by a lens (6), and is then focused at a position a required distance away from the focal point. , alloy plate (
The position of the m lens (6) is adjusted so that the required width of 1) can be irradiated, and there are 4 such irradiation devices,
1) The laser beams are arranged in parallel in the width direction and can irradiate the entire width of the board with a laser beam.

Note that the laser beam generator used in this invention can increase the laser scanning speed by using a polyhedral mirror or a segment mirror instead of the galvanic mirror (5), and can increase the laser scanning speed by using a cylindrical lens. By irradiating the sheet width direction all at once, it is possible to improve the irradiation speed.

The alloy plate (1) was irradiated with a laser beam over the entire width direction or in a zigzag or striped pattern to melt the extreme surface layer; it was solidified, and deposits, oil layers, and moisture on the surface were removed. A laser beam irradiation layer (7), which is a new surface, is formed.

Subsequently, the coil of the high expansion side alloy plate (1), which has been irradiated with a laser beam on the entire surface of the main surface side, is wound back, and the other surface is irradiated with a laser beam in the same manner, and both main surfaces are irradiated with a laser beam. Provide layers.

By the method described above, laser beam irradiation surfaces are provided on both main surfaces of the low-expansion side alloy plate and on one main surface of the austenitic stainless steel plate and the ferritic stainless steel plate to form the required coil.

Next, as shown in FIG. 2, the austenitic stainless steel plate (10) coil that has been irradiated with the laser beam is unwound and moved toward the pressure roll (8), and similarly the high expansion side alloy plate (1) coil, Rewind the low expansion side alloy plate (11) coil and ferritic stainless steel plate (12),
The laser beam irradiation layers are stacked in the above order between the press-welded material plates, facing each other, and simultaneously press-bonded with a press-welding roll (8) to form a bimetal plate (13) of 1 yen each with four layers, and further diffused. Annealing, intermediate cold rolling, and intermediate annealing and finish cold rolling are performed to obtain a corrosion-resistant bimetallic plate according to the present invention.

Due to this pressure welding, the molten solidified layer on each irradiated surface of each press welding material plate (IOXI) (11 x 12) produces fine cracks on the surface due to the influence of internal sublimation deformation, exposing the new internal surface, and forming an austenitic layer. Because the stainless steel plate, high expansion alloy side plate, low expansion alloy side plate, and ferritic stainless steel plate are pressure-welded to each other, the product has superior cleanliness and improved crimp strength compared to conventional mechanically polished surfaces. A bimetallic plate with excellent corrosion resistance can be obtained.

In addition, in the pressure welding method, by interposing a required intermediate layer metal plate having a laser beam irradiation layer on both surfaces between the high expansion side alloy plate (1) and the low expansion side alloy plate (11), a five-layer metal plate can be formed. A corrosion-resistant bimetallic plate of the structure can be obtained.

Therefore, it is necessary to appropriately select the oscillation method of the laser beam, the irradiation output, the distance between the focal point of the fθ lens and the irradiation surface, the moving speed of the irradiated plate, etc., depending on the material and dimensions of the constituent materials of the corrosion-resistant bimetal plate.

Examples Example 1 As an austenitic stainless steel plate, the plate thickness was 1 mm,
A 18% Cr-8% Ni-Fe stainless steel plate (wt%) with a plate width of 300 mm is used, and for the high expansion side alloy plate, a plate of 2.5 mm and a 20% Ni-6% plate with a plate width of 300 mm is used.
A Cr-Fe alloy plate (wt%) is used, and the low expansion side alloy plate has a plate thickness of 2.5 mm, a plate width of 300 mrn, and a 36% Ni-Fe alloy plate.
An alloy plate (wt%) was used.

A 13% Cr-Fe stainless steel plate (wt%) with a plate thickness of 1 mm and a plate width of 300 mm was used as the ferritic stainless steel plate, and the atmospheric gas in the irradiation box was Ar gas. 1) The alloy plate moving speed was 1 m. /min.

The laser irradiation device has an output of 100 W and a frequency of 10 kHz.
Using three switch lasers, the lens focal length was 100 mm, and the wavelength was 1.06 pm, using the same method as the invention shown in FIG. 1 described above.

Laser power density: 500kW/mm2 stripes,
Three beams each having a length of 100 mm were applied in the width direction of each press-welded material plate in succession in the longitudinal direction of the material plate, so that each desired surface was irradiated with the laser beam.

The austenitic stainless steel plate, high expansion alloy side plate, low expansion alloy side plate, and ferritic stainless steel plate were stacked in this order with the irradiated surfaces of each of the pressure welded material plates facing each other, and rolled at a rolling rate of 55% using a pressure roll. Cold pressure welded.

Furthermore, after diffusion annealing, 11 beatings, 11 rolling, and finish rolling, a corrosion-resistant bimetal plate with a 4-layer structure of 0.8 mm thick x 4 layers 1M and 65 mm wide was obtained using a slitter.

For comparison, the same type of austenitic stainless steel sheet, ferritic stainless steel copper sheet, high expansion side alloy sheet, and low expansion side alloy sheet were used. 1% of the conventional mechanical fishing bait was applied to the wire puff polishing using a 0.5 mmΦ wire rotating brush and a moving speed of 15 m/s, followed by cold welding, diffusion annealing, intermediate rolling, and the like under the same conditions as above. After finishing rolling, a corrosion-resistant bimetal plate with a thickness of 0.8 mm and a width of 65 mm was obtained using a slitter.

The crimp strength and appearance properties of the two types of corrosion-resistant bimetal plates obtained were examined, and the results are shown in Table 1.

The crimping strength was determined by a test in which a bimetal plate was crimped to a length of 40 mm in the longitudinal direction, crimped with a crimped part length of 10 mm, and the cross section was made into a T-shape (see Figure 4) so that the bonded material was opened. In other words, 30 test pieces of the same type as the number of laminated layers with t1-formation opened for each laminated surface that will be the surface to be measured were prepared, and they were pulled in a direction perpendicular to the crimped part, and the load was applied when the crimped part peeled off. The crimp strength was set to 11.

As is clear from Table 1, according to the method of the present invention, it is possible to obtain a single-sided bimetallic plate with higher crimp strength and less variation than the conventional method, excellent appearance, and very good quality.

Example 2 As an austenitic stainless steel plate, plate JV 1m
A 18% Cr-8% Ni-Fe stainless steel plate (wt%) with a plate thickness of 2 mm and a plate width of 240 mm is used, and the high expansion side alloy plate is a 5% Mn-23% Ni- plate with a plate thickness of 2 mm and a plate width of 240 mm.
A Fe alloy plate (wt%) was used, and the middle layer was made of 0.5 mm thick, 240 mm wide, and 0.5% Fe-
A Ni alloy plate (wt%) was used.

For the low expansion side alloy, we used a 38% Ni-Fe alloy plate (sail%) with a thickness of 2 mm and a width of 240 mm, and as a ferritic stainless steel plate, we used a 13% Cr-Fe stainless steel plate with a thickness of 1 mm and a width of 240 mm. (wt%), the atmospheric gas in the irradiation box was Ar gas, and the moving speed of the irradiated material plate was 1.2 m/min.

The laser irradiation device has an output of 100 W and a frequency of 10 kHz.
Using three switch lasers, using the same method as in the invention shown in Fig. 1 above, the lens focal length was 100 mm, the wavelength was 1.06 pm, and the laser power density was 500 kW/mm2.
Irradiated field F, ■Three beams of 80mm in the temporary width direction,
A laser beam irradiation surface was formed on both main surfaces of the high expansion alloy side, the low expansion alloy side, and the intermediate layer metal plate, respectively. Similarly, an irradiation surface was formed on one side of each stainless steel 1isI plate.

The irradiated surfaces of each of the press-welded material plates were made to face each other, an austenitic stainless steel plate, a high 11y/bulk side alloy plate,
The intermediate layer metal plate, the low-expansion alloy side plate, and the ferritic stainless steel plate were laminated in this order and cold-welded using a pressure welding roll at a rolling rate of 53%.

Furthermore, after undergoing diffusion annealing, intermediate rolling, and finish rolling,
A five-layer corrosion-resistant bimetal plate having a thickness of 0.6 mm and a width of 40 mm was obtained using a slitter.

For comparison, the same type of austenitic stainless steel plate, ferritic stainless steel plate, high expansion side alloy plate,
Using a low expansion side alloy plate and an intermediate layer metal plate, a 0.5 mmΦ wire rotating brush, [
After performing conventional sand polishing under the wire puff polishing conditions of multi-Jlj speed 15 ml 1 ml, after performing cold welding, diffusion annealing, intermediate rolling, and finish rolling under the above conditions,
A corrosion-resistant bimetal plate with a thickness of 0.6 mm and a width of 40 mm was obtained using a slitter.

The crimp strength and appearance properties of the two types of corrosion-resistant bimetal plates obtained were examined, and the results are shown in Table 2.

As is clear from Table 2, according to the method of the present invention, it is possible to obtain corrosion-resistant bimetallic plates of extremely high quality, which have higher crimp strength and less variation than the conventional method, and have excellent appearance properties.

[Brief explanation of the drawing]

FIG. 1 is a perspective explanatory view showing irradiation of a laser beam onto an alloy plate according to the present invention. FIG. 2 is an explanatory diagram of a press-welded material plate showing cold pressure welding according to the present invention. FIG. 3 is an explanatory diagram of a press-welded material plate showing a pressure 11 strength test method for the press-welded material plate. DESCRIPTION OF SYMBOLS 1... High expansion side alloy plate, 2... Laser beam irradiation device, 3... Irradiation box, 4... Oscillator, 5...
Galvanic mirror, 6... FE lens, 7... Irradiation layer, 8... Press roll, 10... Austenitic stainless steel copper plate, 11... Low expansion side alloy plate, 12... Ferritic stainless steel plate, 13 ...Bimetal plate. Applicant: Sumitomo Special Metals Co., Ltd. Figure 2 Figure 1 October 15, 1988, 1986 Patent Application No. 171155 2, Name of Invention Method for Manufacturing Corrosion-Resistant Bimetal Plate 3, Relationship with the Amendment Person Case Application Address: 5-22 Kitahama, Higashi-ku, Osaka Sumitomoto/Yuki Name: Sumitomo Special Metals Co., Ltd. 4, Agent 5, Detailed description of the invention in the specification subject to amendment, Column for brief description of drawings, Drawings Figures 2 and 3 [Austenitic stainless steel sheet coil] in 1 copy 1, page 3 of the specification, lines 17 to 18 [Austenitic stainless steel sheet coil]
and correct it. 2. In the specification, page 4, line 18, [to improve the pressure welding strength] should be corrected to ``increase the pressure bonding strength.'' 3. In the specification, page 18, line 15, [intermediate rolling, finish rolling] ] is corrected as [intermediate rolling, intermediate annealing, finish rolling J. 4. "Intermediate rolling, finish rolling 1" on page 19, line 5 of the specification is corrected as "
Intermediate rolling, intermediate annealing, finish rolling]. 5. Specification page 19, lines 10 to 17 [The crimp strength was evaluated based on the load applied when the crimped portion was peeled off in the longitudinal direction of the bimetal plate. 1 will be corrected as follows. [The crimp strength is determined by cutting the bimetal plate into a length of 40 mm in the longitudinal direction, and measuring the crimp length of 10 mm as shown in Figure 3a.
A test piece with a T-shaped cross section made by crimping and bonding the mm portions together, for example, an austenitic stainless steel plate (1o) and a high expansion side alloy plate (1), that is, a test piece with a surface to be measured. Thirty test specimens of three types each having an open configuration for each laminated surface were prepared, and the test pieces were pulled in a direction perpendicular to the crimped part, and the crimped strength was evaluated based on the load at which the crimped part peeled off. 6. Change [intermediate rolling, finish rolling] on page 22, line 8 of the specification to [
Intermediate rolling, intermediate annealing, finish rolling]. 76 "Intermediate rolling, finish rolling" on page 22, line 19 of the specification is corrected to "intermediate rolling, intermediate annealing, finish rolling". 8. Between lines 4 and 5 of page 23 of the specification, "crimping strength teeth,
As shown in Figure 3, the bimetal plate is 40 mm long in the longitudinal direction.
After cutting to a length of mm, the 10 stroke length of the crimped part is crimped and laminated together, for example, opened between the high expansion side alloy plate (1) and the middle layer metal plate (14) to form a T-shaped cross section. A test piece with t1 opened for each laminated surface to be measured
Thirty test pieces of each of the four types were prepared, pulled in a direction perpendicular to the crimped part, and the crimped strength was evaluated based on the load at which the crimped part peeled off. ] Add. 9. On page 24 of the specification, lines 2 to 4, [Figure 3 shows the temporary pressure welding materials. [Figures 3a and 3b are explanatory diagrams of test pieces showing a method for testing the crimp strength of press-welded material plates. Correct it to 1. 10Q Brain't II, page 24, line 10 [13...Bimetal plate. ] is corrected as "13...bimetal plate, 14...intermediate metal plate." 11. Figure 2 of the drawing is corrected as shown in the attached sheet. 12. Figure 3 of the drawing is corrected as shown in the attached sheet. Correct. Figure 2 and Figure 3 above.

Claims (1)

[Claims] 1. In a method for manufacturing a bimetallic plate in which an austenitic stainless steel plate, a high expansion alloy plate, a low expansion alloy plate, and a ferritic stainless steel plate are laminated and pressure-welded, one of the austenitic stainless steel plate and the ferritic stainless steel plate is At least one laser beam is irradiated on the entire main surface and on both the main surfaces of the high expansion side alloy plate and the low expansion side alloy plate, and the austenitic stainless steel plate, the high expansion side alloy plate, and the low expansion side alloy plate are A method for manufacturing a corrosion-resistant bimetallic plate, which comprises cold-pressing a plate and a ferritic stainless steel plate, with the surfaces of the irradiated layers formed by the irradiation of each plate facing each other in this order. 2. In a method for manufacturing a bimetallic plate in which a high expansion side alloy plate, a low expansion side alloy plate, and an austenitic stainless steel plate and a ferritic stainless steel plate are laminated and pressure-welded on the outer surface thereof with an interlayer metal plate interposed therebetween, the high expansion side alloy plate At least one laser beam is irradiated onto the entire surface of both main surfaces of the low expansion side alloy plate, the entire surface of both main surfaces of the intermediate layer metal plate, and the entire surface of one main surface of the austenitic stainless steel plate and the ferritic stainless steel plate. , an intermediate layer metal plate having an irradiation layer formed by the irradiation on both main surfaces is sandwiched, the irradiation layer surfaces of both alloy plates are faced to each other, and an austenitic stainless steel plate is placed on the irradiation layer surface of the high expansion side alloy plate. A method for producing a corrosion-resistant bimetallic plate, characterized in that the irradiated layer surface of the ferritic stainless steel plate is opposed to the irradiated layer surface of the low expansion side alloy plate, and the irradiated layer surface of the ferritic stainless steel plate is cold press-welded.