JP3256360B2 - Ni alloy clad stainless steel sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a Ni alloy clad stainless steel sheet in which stainless steel is coated with a Ni alloy having high corrosion resistance.

[0002]

2. Description of the Related Art Japan is surrounded by the sea, and therefore has high humidity, and the corrosion of metals accompanying environmental changes causes a great loss of social resources such as reduced resources and unsightly appearance due to corrosion. It is connected. For this reason, titanium, which is a so-called maintenance-free metal material that has good corrosion resistance, is lightweight and has excellent strength, and does not need to be subjected to surface treatment such as painting, is used as various exterior materials including roof materials and exterior wall materials However, at present it is expensive and not widely used.

[0003] Therefore, a composite material of titanium and steel has been provided, but in order to be used as an exterior material such as a roof material, the steel side must be painted or laminated, and the titanium and steel must be coated. There is a problem that rust is generated on the end face because the corrosion potential is too different. Furthermore, in the case of rolling and pressure bonding, during the heating and hot rolling of the slab, an intermetallic compound of carbide and iron is generated due to the interdiffusion of titanium and C in steel, and a brittle interface is formed, and the adhesion strength is increased. Becomes smaller.

[0004] Further, a composite material in which titanium and stainless steel are pressure-bonded by rolling has been considered, but has not been put to practical use at present. This is because, among stainless steels, the temperature during hot rolling of austenitic stainless steel, which has good corrosion resistance, is not higher than the solution heat temperature, so that deformation resistance is too high and hot rolling becomes extremely difficult. The hot rolling temperature is preferably not less than the transformation point (about 880 ° C.) even for titanium, but a thick and hard oxide film is formed in an oxidizing atmosphere. When this oxide film is included up to the lower oxygen-containing hardened layer, the thickness is several hundreds.
Not only does it lead to the loss of expensive titanium down to μm,
This oxide film is crushed during the next cold rolling to become fine powder, and this powder has a problem that countless fine flaws are formed on the titanium surface. Also, TiC, TiF
Another problem is that there is no effective means for preventing the formation of carbides and intermetallic compounds such as e ₂ and TiFe.

In order to solve this problem, a method of rolling by suppressing the formation of an embrittled layer such as an intermetallic compound by a sandwich structure of a base material, a metal intermediate layer and a laminated material (Japanese Patent Application Laid-Open No.
-170586), or by forming an intermetallic compound between titanium and a base material by the bonding intermediate material by interposing a bonding intermediate material between titanium and the base material and defining an interval between the bonding intermediate material and titanium. Method of avoiding rolling
Further, a method has been proposed in which an Fe-based thin metal is explosively deposited on titanium, and a composite slab is assembled from this and a base material and hot-rolled (Japanese Patent Laid-Open No. 2-295682).

However, the conventional sandwich construction not only increases the material cost but also lowers the productivity.
In addition, rolling in vacuum or under reduced pressure means that
This is economically burdensome. Further, there has been provided a composite material in which titanium is joined to a base stainless steel by a polyester-based adhesive.

However, in this composite material, the thermal expansion coefficient of the composite material and that of the base material are different from each other, so that the composite material shifts due to aging, and the adhesive force deteriorates due to aging. Due to the difference in bending stress between the material and the base material, there is a problem that bending is difficult and welding is impossible.

[0008]

For this reason, the present applicant has developed a titanium-clad stainless steel composite material in which a discarded material is bonded to the titanium layer side of a titanium-clad stainless steel slab in which titanium and stainless steel are bonded by an explosion method. Has been proposed to produce a titanium-clad stainless steel sheet having a beautiful surface with no loss of titanium due to oxidation or hardening by removing the discarded material after hot rolling. -21404). However, this method requires waste materials, increases the number of members, and is not economical.

[0009] On the other hand, despite the fact that Ni alloys are excellent in corrosion resistance, strength and workability, they are not used as roofing materials, outer wall materials and various other exterior materials at the same cost as titanium. There is a cause. The present invention has been made in order to solve the above problems, and the purpose thereof is to increase the bonding strength between the laminated material and the base material,
An object of the present invention is to provide a Ni alloy clad stainless steel sheet which is excellent in bending workability, excellent in rollability, high in productivity, and does not require any discarded material, and has a beautiful surface.

[0010]

According to the first aspect of the present invention, there is provided a Ni alloy clad stainless steel slab in which a Ni alloy as a bonding material and a stainless steel as a base material are joined by an explosion method.
Hot rolling at a temperature of 1,050 to 1,100 ° C,
It is characterized by being annealed at 800 ° C. for a time of 10 to 50 minutes and further cold-rolled. The invention according to claim 2 is characterized in that the main chemical composition of the Ni alloy as the composite material is Ni alloy.
And one or more selected from the group consisting of Cu, Cr and Mo.

According to a third aspect of the present invention, the main alloy composition of the Ni alloy is 60 to 70 wt% of Ni,
-40 wt%.

[0012]

According to the first aspect of the present invention, since the explosion slab has a gentle hardness distribution in the vicinity of the interface, the subsequent hot rolling and cold rolling work conditions can be set widely, and the range of the manufacturing conditions can be widened. There is no worry about interface peeling or shape failure during rolling.
In addition, no waste material is required, hot rolling can be performed in the atmosphere, and the load on the apparatus and the cost is small.

According to the second aspect of the present invention, workability and rollability are improved by containing Cu, and corrosion resistance is further increased by containing Cr and Mo. is there. According to the third aspect, the rollability is significantly improved. Hereinafter, the present invention will be described in detail.

In the present invention, the base material is stainless steel, and any of austenitic steel and ferritic steel can be applied. The carbon content of stainless steel is 0.08w
It is preferably at most t%. If it exceeds 0.08 wt%, carbides serving as an embrittlement layer may be formed at the bonding interface with the Ni alloy. Also, the Ni alloy of the composite material may be of various compositions, but the main chemical composition is Ni,
One or more members selected from the group consisting of Cu, Cr and Mo are suitably employed. In this composition, by containing Cu, the workability and the rolling property are improved, the corrosion resistance is excellent, and the color tone at the time of rusting is good. The corresponding rainbow color can be expressed. Also, C
When u is contained in an amount of 2 to 10% by weight, the hot deformation resistance can be reduced by about 30% as compared with the case of no addition,
Workability is significantly improved. The inclusion of Cr improves the weather resistance and further enhances the corrosion resistance. However, the inclusion of 5 to 20 wt% improves the high-temperature oxidation resistance and increases the corrosion resistance by high-temperature oxidation to 600 wt%. 900 ° C at 12 ° C, 1 wt% at 19 wt%
0 mg / dm ² (no increase in oxidation) up to 010 ° C.
As the content increases, a deep greenish luster is obtained. When Mo is contained, the corrosion resistance is further increased.
The strength of the material can be increased by 50% or more, and when the composite material requires a certain strength, the content can be reduced to 1/3 or less. In addition, a small amount of Al, Si, Fe,
W, Ti, C, etc. may be added as a component. And
When rollability is the main purpose, a Ni-Cr alloy is preferable. In particular, the main chemical composition is Ni 60 to 70 wt%, C
Preferably, u is 30 to 40 wt%. This is because the higher the Ni content, the higher the salt resistance (100 wt.
%) Good, but 2 per unit weight compared to Cu
-8 times more expensive, so Ni content is 60-70w
By setting it in the range of t%, the reduction in salt resistance is reduced to only 11% in spite of the low price, while
By setting the Cu content to 30 to 40% by weight, the workability is improved, so that the hot rolling property is improved. In particular, the color change during long-term use exhibits a design effect as an exterior material and is excellent in color. Becomes The Ni alloy, which is this composite,
It is preferable to use a material having a smooth surface and a clean surface, and a material having a vertical width and a horizontal width larger than that of the base material by, for example, about 50 mm. The thickness of the Ni alloy is 100 μm or more in terms of the product thickness after rolling, and is preferably 1/5 to 1/20 with respect to the base material. 1 /
If it is larger than 5, the proportion of the expensive Ni alloy occupies too large, and there is no economic effect to make the clad steel sheet, and the difference in material properties between the Ni alloy and stainless steel is not reduced, and various shapes are obtained. It is difficult to mold the product. Conversely, if it is smaller than 1/20, the Ni alloy may be locally broken at the time of hot rolling or forming, and the stainless steel of the base material may be exposed.
It tends to be difficult to ensure durability.

In the present invention, the stainless steel as the base material and the Ni alloy as the bonding material are joined by the explosion method. First, the stainless steel slab is finished smoothly by scarfing or the like, and the scale is removed. And use it as a base material. In order to obtain a strong interfacial bonding strength, the stainless steel slab and the Ni alloy as the bonding material are arranged so as to have a certain gap. For example, it is 1 mm. This is detonated with an explosive having an appropriate explosion speed, for example, a detonation speed of 2000 m / sec or less. Next, although depending on the location of the explosive, the Ni alloy clad stainless slab, which is mechanically cut and removed and has an excellent end face shape, since the peripheral portion of the Ni alloy as the bonding material has a shape protruding from the end of the stainless steel slab. To manufacture.

Thereafter, the Ni alloy-clad stainless steel slab is heated and hot-rolled in a reverse or tandem manner in a pass schedule using several stages, for example, five stands, to obtain a hot rolled Ni alloy-clad stainless steel sheet. The heating of the slab is at 900-1200 ° C. for 1-5 hours.
At 900 ° C. or lower, the Ni alloy is not agglomerated and 1200
If the temperature is higher than 0 ° C., the crystal grains become coarse, the grain boundaries become brittle, and grain boundary oxidation occurs. As a result, so-called lumped cracks are caused and rolling becomes impossible. Set the slab heating temperature to 10
When the temperature is set to 00 ° C. or higher, austenitic steel can be rolled.

The hot rolling is important to manage the rolling temperature and the stop temperature, the rolling temperature is from 1,050 to 1,100 ° C..
At 1100 ° C. or higher, the crystal grains are easily coarsened, and it is difficult to make the grains fine by rolling. If the grain size cannot be reduced, the total length of the crystal grain boundaries is small, so that the strength of the material cannot be increased, and it is difficult to continue rolling by repeating the number of passes. If the temperature is lower than 1050 ° C., the deformation resistance is too large, and not only extra power is required for the rolling mill, but also roll flaws and other defects are likely to occur .

The final rolling end temperature is suitably 850 ° C. or higher. At 850 ° C or lower, the deformation resistance further increases,
Further rolling is practically impossible. Hot-rolled steel sheet, it is necessary to annealing before cold Ma圧rolled. Annealing is 7
40 to 800 ° C. for 10 to 50 minutes. If the temperature is 740 ° C. or lower, the hardness is high under the influence of residual stress during hot rolling, the strength and proof stress are too large, and the elongation is too small, so that it is not suitable for subsequent cold rolling. Also, since the purpose is annealing, it is not necessary to raise the temperature, and 800 ° C. or less is sufficient.

The cold rolling is immersed in a nitric hydrofluoric acid-based pickling solution in the same manner as applied to the base stainless steel in order to remove scale formed on the surface of the Ni alloy and stainless steel during hot rolling. Do later. The cold rolling reduction naturally depends on the thickness of the product to be manufactured, and the number of passes also differs.However, if it is necessary to take a cold rolling reduction large enough to cause warpage of the product due to the difference in deformation resistance, the different peripheral speed It is necessary to change the frictional resistance between the roll and the material on the upper and lower surfaces such as rolling.

In this case, the work roll itself should be as small as possible in diameter in terms of securing the rolling ratio, improving the shape, and reducing the energy. Although the surface of the steel sheet is smoothed by cold rolling, the steel sheet after cold rolling may be annealed and temper rolled depending on the application. The Ni alloy clad stainless steel plate manufactured in this manner has high durability and can be suitably used as an exterior material such as a roof material and a wall material.

Next, the present invention will be specifically described based on examples. In the following,% indicating the composition ratio is% by weight. (Example 1) Chemical composition: C: 0.06%, Si: 0.8
0%, Mn: 1.50%, P: 0.03%, S: 0.0
2%, Ni: 8.50%, Cr: 18.80%, Fe:
Bal. , Thickness 30mm, length 2000mm, width 900
mm stainless steel slab was finished smoothly by scarfing and scale was removed to obtain a base material.

Next, a stainless steel slab having a chemical composition of Ni: 66.5%, Cu: 31.5%, Fe: 1.2%
(“MONEL alloy 400” (trade name, manufactured by Daido Incoalloy Co., Ltd.)) with a thickness of 3.0 mm and a height of 2100
mm, a 1000-mm-wide Ni alloy, which is a composite material, is arranged at an interval of 1 mm, and 1500 m / sec.
It was detonated with explosives having the following explosive speeds:

Next, a peripheral portion of the Ni alloy, which is a joining material, protruding from an end of the stainless steel slab is mechanically cut and removed to produce a Ni alloy clad stainless slab. Thereafter, the Ni alloy-clad stainless steel slab is heated to 1100 ° C.
For 3 hours, and hot-rolled in a reverse manner using one stand to obtain a Ni alloy-clad stainless hot-rolled steel sheet. The actual temperature during rolling was controlled to be 1050 to 1100 ° C, and the final temperature was 890 ° C. Rolling rate is 8
8%.

[0024] Then, after the generated scale was <br/> removed during hot rolling, subjected to 30 min anneal treatment at 770 ° C., and then the 6 high cold rolling mill (the work roll diameter 200
mm) Cold rolling was performed using two stands. Rolling oil used mineral oil. The rolling reduction was 75%. Thus, a Ni alloy clad stainless steel sheet having a total rolling reduction of 97% and a product thickness of 1.00 mm was produced. (Example 2) A Ni alloy-clad stainless steel sheet having a total rolling rate of 92% and a product thickness of 2.50 mm in the same manner as in Example 1 except that the hot rolling rate was 82% and the cold rolling rate was 58%. Was manufactured. (Example 3) Chemical composition: C: 0.06%, Si: 0.62%, Mn:
0.63%, P: 0.03%, S: 0.02%, Cr:
17.20%, Fe: Bal. In, thickness 30mm, length 2
A Ni alloy clad stainless steel sheet having a total rolling reduction of 97% and a product thickness of 1.00 mm was produced in the same manner as in Example 1 except that a stainless steel slab having a size of 000 mm and a width of 900 mm was used. (Example 4) A Ni alloy-clad stainless steel sheet having a total rolling rate of 92% and a product thickness of 2.50 mm in the same manner as in Example 3 except that the hot rolling rate was 82% and the cold rolling rate was 58%. Was manufactured. (Example 5) Chemical composition: Ni: 65.5%, Cu: 29.5%, F
e: 1.2%, Al: 2.7%, Ti: 0.6% (“M
ONEL alloy K-500 "(trade name, manufactured by Daido Incoalloy Co., Ltd.) was used, and the total rolling ratio was the same as in Example 1 except that the hot rolling ratio was 86% and the cold rolling ratio was 74%. Is 96% and the product thickness is 1.20mm
Was manufactured. (Example 6) Except that the hot rolling reduction was 80 % and the cold rolling reduction was 70 %, the total rolling reduction was 84 % and the product thickness was as in Example 5.
A 2.00 mm Ni alloy clad stainless steel sheet was manufactured. (Example 7) Chemical composition: Ni: 65.5%, Cu: 29.5%, F
e: 1.2%, Al: 2.7%, Ti: 0.6% (“M
ONEL alloy K-500 (trade name, manufactured by Daido Incoalloy Co., Ltd.), and the total rolling ratio was the same as in Example 3 except that the hot rolling ratio was 80% and the cold rolling ratio was 73%. Is 95% and the product thickness is 1.80mm
Was manufactured. (Example 8) Chemical composition: Ni: 57.0%, Cr: 15.5%, M
o: 16.0%, Fe: 6.0%, W: 4.0%, V:
0.3%, C: 0.01% (“INCO alloy C
-276 "(trade name of Daido Incoalloy Co., Ltd.)
A Ni alloy clad stainless steel sheet having a total rolling reduction of 97% and a product thickness of 1.00 mm was produced in the same manner as in Example 1 except that the i alloy was used. (Example 9) Chemical composition: Ni: 57.0%, Cr: 15.5%, M
o: 16.0%, Fe: 6.0%, W: 4.0%, V:
0.3%, C: 0.01% (“INCO alloy C
-276 "(trade name of Daido Incoalloy Co., Ltd.)
A Ni alloy clad stainless steel sheet having a total rolling reduction of 97% and a product thickness of 1.00 mm was produced in the same manner as in Example 3 except that the i alloy was used. (Example 10) Chemical composition: Ni: 57.0%, Cr: 20.5%, M
o: 14.2%, Fe: 2.3%, W: 3.2%, V:
0.25%, C: 0.01% (“INCONELall
oy 622 "(trade name, manufactured by Daido Incoalloy Co., Ltd.)
A Ni alloy-clad stainless steel sheet having a total rolling reduction of 97% and a product thickness of 1.00 mm was produced in the same manner as in Example 1 except that the Ni alloy was used. (Example 11) Chemical composition: Ni: 57.0%, Cr: 20.5%, M
o: 14.2%, Fe: 2.3%, W: 3.2%, V:
0.25%, C: 0.01% (“INCONELall
oy 622 "(trade name, manufactured by Daido Incoalloy Co., Ltd.)
A Ni alloy-clad stainless steel sheet having a total rolling ratio of 97% and a product thickness of 1.00 mm was produced in the same manner as in Example 3 except that the Ni alloy was used. (Example 12) Chemical composition: Ni: 57.0%, Cr: 20.5%, M
o: 14.2%, Fe: 2.3%, W: 3.9%, C:
0.01% ("INCONEL alloy 686"
A Ni alloy-clad stainless steel sheet having a total rolling ratio of 97% and a product thickness of 1.00 mm was manufactured in the same manner as in Example 1 except that a Ni alloy manufactured by Daido Incoalloy Co., Ltd.) was used. (Example 13) Chemical composition: Ni: 57.0%, Cr: 20.5%, M
o: 14.2%, Fe: 2.3%, W: 3.9%, C:
0.01% ("INCONEL alloy 686"
A Ni alloy-clad stainless steel sheet having a total rolling ratio of 97% and a product thickness of 1.00 mm was produced in the same manner as in Example 3 except that a Ni alloy (trade name, manufactured by Daido Incoalloy Co., Ltd.) was used. (Comparative Example 1) Instead of a stainless steel slab, the chemical composition was C: 0.0
6%, Si: 0.03%, Mn: 0.42%, P: 0.
02%, S: 0.02%, Fe: Bal. And thickness 30
A Ni alloy clad steel sheet having a product thickness of 1.00 mm was manufactured in the same manner as in Example 1 except that a normal steel sheet having a thickness of 2,000 mm, a length of 2,000 mm and a width of 900 mm was used and the total rolling ratio was 97%. (Comparative Example 2) A thickness of 3.0 mm, a length of 2100 mm, and a width of 10 as a composite
Using a JIS Class 1 industrial pure titanium plate of 00 mm,
A titanium clad stainless steel sheet having a product thickness of 1.00 mm was produced in the same manner as in Example 1 except that the total rolling ratio was 97%. (Comparative Example 3) A titanium clad steel sheet having a product thickness of 2.50 mm was manufactured in the same manner as in Comparative Example 2 except that the hot rolling temperature was set to 800 ° C and the total rolling ratio was set to 92%. (Comparative Example 4) As a composite material, a thickness of 3.0 mm, a length of 2100 mm, and a width of 10
Using a JIS Class 1 industrial pure titanium plate of 00 mm,
The product thickness was 2.00 mm in the same manner as in Example 1 except that the hot rolling temperature was 1050 ° C. and the total rolling reduction was 94%.
Was manufactured. (Comparative Example 5) Chemical composition: C: 0.06%, Si: 0.80%, Mn:
1.50%, P: 0.03%, S: 0.02%, Ni:
8.50%, Cr: 18.80%, Fe: Bal. so,
A stainless steel thin plate having a thickness of 0.9 mm, a length of 2000 mm, and a width of 900 mm was used as a base material.

Next, the stainless steel sheet and the chemical composition are N
i: 66.5%, Cu: 31.5%, Fe: 1.2%
(“MONEL alloy 400” (trade name, manufactured by Daido Incoalloy Co., Ltd.)) with a thickness of 0.1 mm and a height of 2100
An Ni alloy thin stainless steel sheet was manufactured by joining together a thin Ni alloy sheet having a thickness of 1000 mm and a width of 1000 mm with a polyester adhesive. (Comparative Example 6) Component: C: 0.06%, Si: 0.80
%, Mn: 1.50%, P: 0.03%, S: 0.02
%, Ni: 8.50%, Cr: 18.80%, Fe: B
al. 0.9mm thick, 2000mm long, 900 wide
mm stainless steel sheet was used as a base material.

Next, a titanium laminated stainless steel plate was manufactured by joining a stainless steel thin plate and a titanium material having a thickness of 3.0 mm, a length of 2,100 mm and a width of 1,000 mm, which was a combination material, with a polyester adhesive. The N thus manufactured
The following qualities were evaluated for an i-alloy-clad stainless steel sheet, a Ni-alloy-clad stainless steel sheet, a titanium-clad stainless steel sheet, and the like. The results are shown in Table 2. 1) Appearance The appearance was visually observed for any abnormality.

：: uniform appearance ×: surface defects (roughness, turning up of Ni alloy or titanium layer, exposure of stainless steel layer, etc.) 2) Peeling test Clad steel sheets of Examples 1 to 13 and Comparative Examples 1 to 4 Was measured by a shear strength measurement test in a state after hot rolling. This is because in the state after cold rolling, the clad steel sheet is too thin to make a test piece for measurement, and the bonding strength between the base material and the composite material is almost determined at the end of hot rolling. It is.

Width 25 mm, length 150 mm (rolling direction)
And two cut notches at 10 mm intervals in the center of the test piece at right angles to the longitudinal direction. One is cut out from the base material side to a depth reaching the boundary with the laminated material, and the other is cut out from the laminated material side to a depth reaching the boundary with the composite material. Therefore, the width 25
mm and a length of 10 mm (= 250 mm ² ) in the original state remains. The test piece was pulled from both sides by a tensile tester at a pulling speed of 10 mm / min, and the peeling strength was measured as the shear strength.

The Ni alloy laminated stainless steel sheet of Comparative Example 5 and the titanium laminated stainless steel sheet of Comparative Example 6
And about Comparative Example 6, width 25mm, length 150mm
In the same manner, two notch notches from the base material and the laminated material to the adhesive layer were inserted into the test piece, and the shear strength was measured in the same manner. Then, the peeled interface was observed.

：: No interfacial peeling between the base material and the mating material was observed. ×: No interfacial peeling between the base material and the mating material was observed. 3) Twice 0T bending test The mating material side of the product was on the inside. After performing 0T bending on the base material, the substrate was subjected to 0T close bending again in the opposite direction, that is, outside, and then returned to a flat plate shape, and the peeling state between the base material and the laminated material was observed from the cross-sectional direction.

：: No abnormality or deterioration was observed before the test. △: Slight peeling occurred between the base material and the laminated material. X: A peeling was clearly observed. 4) Salt Spray Test The test piece after the observation of the twice 0T bending test was immersed in 5% saline (40 ° C.) for 3 weeks, and the progress of peeling at the end face was observed.

：: No abnormality or deterioration was observed before the test. Δ: Some peeling occurred between the base material and the laminated material. X: Degree of clear peeling. 5) Heat cycle test A test specimen of 50 × 150 mm was immersed in a hot silicone oil bath at 120 ° C. for 5 minutes and cooled and held at room temperature (blowing with cool air). The presence or absence of exfoliation at the end face due to stress caused by the expansion coefficient between the laminated materials was observed.

：: No abnormalities or deterioration were observed in the peeling test after the application of the thermal cycle, as in the initial stage. 合 わ せ: Some peeling of the laminated material occurred at the processed part such as bending ×: Cladding layer Table 1 Manufacturing Conditions Base material Laminated material Joining method Product Rolling rate (%) Thickness (mm) Thickness (mm) Thickness (mm) HR CR TR Example 1 30 3 Explosion 1.00 88 75 97 2 30 3 Explosion 2.50 82 58 92 3 30 3 Explosion 1.00 88 75 97 4 30 3 Explosion 2.50 82 58 92 5 30 3 Explosion 1.20 86 74 70 630 3 Explosion 2.00 80 70 84 7 30 3 Explosion 1.80 80 73 95 8 30 3 Explosion 1.00 88 75 97 9 30 3 Explosion 1.00 88 75 97 10 30 3 Explosion 1.00 88 75 97 11 30 3 Explosion 1.00 88 75 97 12 30 3 Explosion 1.00 88 75 97 13 30 3 Explosion 1.00 88 75 97 Comparative Example 1 30 (Fe) 3 Explosion 1.00 88 75 97 2 30 (Fe) 3 (Ti) Explosion 1.00 88 75 97 3 30 (Fe) 3 (Ti) Explosion 2.50 82 58 92 4 30 3 (Ti) Explosion 1.00 88 75 97 5 0.9 0.1 Adhesive 1.00--- 6 0.9 0.1 (Ti) Adhesive 1.00--- Table 2 Quality Evaluation Test Appearance Peeling test Shear strength Bending test Salt spray Heat cycle (kgf / mm ² ) Test Test Example 1 ○ ○ 37 ○ ○ ○ 2 ○ ○ 35 ○ ○ ○ 3 ○ ○ 38 ○ △ ○ 4 ○ ○ 33 ○ △ ○ 5 ○ ○ 36 ○ ○ ○ 6 ○ ○ 33 ○ ○ ○ 7 ○ ○ 34 ○ △ ○ 8 ○ ○ 37 ○ ○ ○ 9 ○ ○ 37 ○ △ ○ 10 ○ ○ 35 ○ ○ ○ 11 ○ ○ 35 ○ △ ○ 12 ○ ○ 36 ○ ○ ○ 13 ○ ○ 36 ○ △ ○ Comparative Example 1 ○ ○ 35 ○ × ○ 2 × × 25 × × −3 × ○ 17 △ × ○ 4 × × 17 △ ○ −5 ○ × 2 × ○ × 6 × × 2 × × × From the results in Table 2, in Comparative Example 1, rust occurred on the base material in the salt spray test. Comparative Example 2,
When titanium is used as a bonding material as in 3 and 4, an oxide film is formed on the titanium layer by a hot rolling process, which is crushed during cold rolling to form countless fine flaws on the surface. Was gone. In Comparative Examples 5 and 6, it can be seen that the bonding strength itself cannot be increased with the adhesive.

On the other hand, it can be seen that the examples of the present invention are excellent in all qualities and can be suitably used as exterior materials such as roof materials and wall materials.

[0035]

According to the first aspect of the present invention, N is a bonding material.
A Ni alloy-clad stainless steel slab in which an i-alloy and a base material stainless steel are joined by an explosion method is subjected to a temperature of 1050.
Hot rolling at ~ 1100 ° C, temperature 740 ~ 800 ° C, time
Since it is annealed for 10 to 50 minutes and further cold rolled,
Since the explosion slab has a gentle hardness distribution near the interface,
The subsequent hot rolling and cold rolling work conditions can be set widely, and the range of manufacturing conditions can be widened. Further, there is no concern about interface peeling or shape defects during rolling. In addition, no waste material is required, hot rolling can be performed in the atmosphere, and the load on the apparatus and the cost is small. Further, the hot rolling temperature is 1050 to 1100 ° C.
Therefore, the crystal grains are refined during hot rolling,
Degree can be sufficiently improved, and deformation resistance is suppressed.
No extra power is required for the rolling mill
Make sure that no defects such as roll flaws occur even if
After hot rolling, then cold rolling
Before annealing, and the annealing temperature is 740 ° C.
800 ° C, sufficient residual stress during hot rolling
To make the hardness, strength and proof stress excessively large.
To ensure sufficient material elongation during cold rolling
It can be.

According to the second aspect of the present invention, the main chemical composition of the Ni alloy as the composite material is one or two or more selected from the group consisting of Ni and Cu, Cr and Mo. The workability and the rolling property are improved by Cu, and the corrosion resistance is further increased by containing Cr and Mo. According to the third aspect, the main chemical composition of the Ni alloy as the composite material is Ni 60 to 70.
Since the content is 30 wt% and the content of Cu is 30 to 40 wt%, the rollability is remarkably improved.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B23K 20/00-20/08

Claims (3)

(57) [Claims] An Ni alloy clad stainless steel slab in which a Ni alloy as a composite material and a stainless steel as a base material are joined by explosion welding is hot rolled at a temperature of 1050 to 1100 ° C.
And annealing at a temperature of 740 to 800 ° C. for a time of 10 to 50 minutes
And a cold-rolled Ni alloy clad stainless steel sheet. 2. The main chemical composition of a Ni alloy as a composite material is one or more selected from the group consisting of Ni and Cu, Cr and Mo.
The Ni alloy clad stainless steel sheet as described. 3. The Ni alloy clad stainless steel sheet according to claim 1, wherein the main chemical composition of the Ni alloy as the composite material is 60 to 70 wt% of Ni and 30 to 40 wt% of Cu.