JPH06100989A - Cr-ni stainless steel sheet free from working surface roughing and its production - Google Patents

Abstract

PURPOSE:To provide a Cr-Ni stainless steel sheet excellent in surface quality by providing a specific composition and allowing specific colonies to be present uniformly in a mixed state. CONSTITUTION:This stainless steel sheet has a structure wherein (C+N) is <=0.09mass% and Md30 defined by equation is 30-60 deg.C. Colonies A, in which the average sizes in a rolling direction and a sheet-width direction are dRD(A) and drD(A), respectively, and principal crystal orientation is {112}<111> and {113}<332>, and colonies B, in which the average sizes in rolling direction and sheet-width direction are dRD(B) and drD(B), respectively, and principal crystal orientation is {110}<111>, {110}<112>, and {110}<001>, are present uniformly in mixed state in the sheet thickness layer part plane parallel to sheet surface of this steel sheet. At this time, dRD(A) or dRD(B) is <=300mum, and drD(A) or drD(B) is <=200mum. By this method, the occurrence of working surface roughing by the manufacturing process by strip continuous casting method can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention casts a slab having a thickness close to the product thickness by a so-called synchronous continuous casting method in which a mold moves in synchronization with the slab, without hot rolling. The present invention relates to a Cr-Ni-based stainless steel thin plate which is directly cold-rolled and has no roughened surface and a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, in order to produce a stainless steel thin plate by a continuous casting method, a casting having a thickness of 100 mm or more is cast while vibrating the casting mold in the casting direction, and the surface of the obtained casting is cleaned. After being heated to 1000 ° C. or higher in a heating furnace, hot rolling was performed by a hot strip mill consisting of a rough rolling mill and a finishing rolling mill to obtain a hot strip having a thickness of several mm.

When the hot strip thus obtained is cold-rolled, the hot strip subjected to strong hot working is softened in order to secure the shape (flatness), material and surface texture required for the final product. The hot-rolled sheet was annealed for this purpose, and the scale on the surface was removed by grinding after the pickling step. In the conventional process, a huge hot rolling facility requires a large amount of energy for heating and processing the material, and it is difficult to say that the manufacturing process is excellent in terms of productivity. Also, the final product is
There were many restrictions in use, such as the need to consider the anisotropy when a texture was achieved and the user added press work or the like.

Therefore, in order to solve the problem that a long hot rolling facility and a large amount of energy and rolling power are required to roll a slab having a thickness of 100 mm or more into a hot strip, recently, continuous casting has been performed. In the process of (1), research on a process for obtaining a slab (thin band) having a thickness equal to or close to that of hot strip is underway. For example, "Iron and Steel"'85, A197 to A256 and "CAMP ISI".
J "vol. 1, 1988, 1670-1705, the process of obtaining hot strip directly by continuous casting is disclosed.

In such a continuous casting process,
The gauge of the slab (strip) to be obtained is 1 to 10 mm
The twin-drum system is under consideration when the gauge is 20 to 50 mm, and the twin-belt system is examined when the gauge of the slab is 20 to 50 mm.

[0006]

In the continuous casting process of this type, a slab close to the final shape is produced,
Intermediate steps such as hot rolling process and heat treatment process are omitted or reduced. Therefore, it is known that the structure of the slab has a great influence on the material and surface properties of the product. As a result of detailed study of the press formability of a thin plate manufactured by the Cr-Ni-based stainless steel plate manufacturing process by continuous strip casting, the present inventors have found that surface defects called roughening of the processed surface are concretely shown below. It turned out to occur.

The roughened surface is remarkably generated when the Cr-Ni type thin plate is subjected to the bulging process under the biaxial stress load, and the undulations parallel to the rolling direction on the surface of the steel plate and the ribs forming a certain angle with the rolling direction. Surface defects. The maximum waviness height of this defect reaches 2 to 6 μm when the pressing degree is high,
This is a serious defect that cannot be found in the thin plate produced by the conventional continuous casting / hot rolling / cold rolling process (hereinafter abbreviated as “conventional method”).

[0008] The roughened surface is a material that significantly impairs the commercial value of strip continuously cast thin plate products for processing applications, and a technique for preventing this has been required. It is an object of the present invention to provide a Cr—Ni-based strip continuously cast stainless steel thin plate having excellent surface quality that does not cause roughened work surface, and a method for manufacturing the same.

[0009]

The present invention firstly comprises the following C
The gist is an r-Ni-based stainless steel plate. That is, C + N is 0.090 mass% or less and Md ₃₀ = 4
13-462 (C + N) -9.2Si-8.1Mn-1
3.7Cr-18.5Mo-9.5 (Ni + Cu) (each component is mass%) has an Md _{30 of 30} to 60 ° C.
And the average dimension in the rolling direction is d _RD (A) on the surface of any plate thickness layer parallel to the plate surface of the steel plate.
And the main crystal orientations whose average dimension in the plate width direction is d _TD (A) are {112} <111>, {113} <332>.
Colony A consisting of and the average size in the rolling direction is d
_RD (B) and the average dimension in the plate width direction is d _TD (B), the main crystal orientations are {110} <111>, {110} <
Both colonies B consisting of 112>, {110} <001> are present in the steel sheet with each other uniformly mixed, and d _RD (A) or d _RD (B) are each 300 μm or less, and d _TD (A) or d _TD (B) is 200μ
A Cr-Ni-based stainless steel plate having a thickness of m or less is featured.

The Cr-Ni type stainless steel sheet of the present invention is a thin strip having a thickness of 10 mm or less at a solidification cooling rate of 100 ° C./sec or more by a continuous casting machine in which the side surface of the mold moves in synchronization with the slab of molten steel. It is provided by a manufacturing method of casting into a slab, cooling from the highest possible temperature to 1200 ° C. at a cooling rate of 50 ° C./sec or more after solidification, and then performing cold rolling and final annealing. The cold rolling in this case has a working rate of 30.
% Or more cold rolling, then 1000-1200 ° C
It may be carried out by a so-called double rolling method, in which an intermediate annealing is applied at the temperature of and then cold rolling is performed to a final plate thickness.

As is generally used, Md ₃₀ is the temperature at which 50% or more of the structure becomes martensite when cold working is performed at 30%. Hereinafter, the present invention will be described in detail. The present inventors investigated the relationship between the average γ grain size of a Cr—Ni-based stainless steel strip continuous cast piece corresponding to SUS304 steel and the height of roughened surface of worked product material. That is, using steels having several compositions having different Md ₃₀ points shown in Table 1, the average γ grain size was varied for each of them.
A 3 mm thick continuous cast piece was manufactured. These were cold-rolled to a thickness of 0.6 mm, then bright-annealed (1190 ° C, held for 20 seconds) and temper-rolled, and then subjected to cylindrical flat bottom overhanging (punching diameter 5
(0 mm, overhang height 10 mm) was performed to measure the height of roughened surface of the flat bottom.

[0012]

[Table 1]

FIG. 1 summarizes the results. That is, (1) in the case of the same composition material in which the Md ₃₀ point shows a constant value, the coarser the average γ grain size of the cast piece, the higher the processed surface roughness of the product, and (2) the higher the Md ₃₀ point, The first finding was that the height of roughened skin was reduced.

Further, FIG. 2 shows the results of examining the relationship between the height of roughened work surface and the average waviness width and average waviness length in a material having an Md ₃₀ point of 30.2 ° C. The swell width is about 20
When it becomes 0 μm (solidification average γ particle size: 100 μm) or more, the rough skin height increases linearly in proportion to the waviness width,
It was also clarified that there is a similar relationship between the length of undulation and the height of rough skin.

The ridge-like surface defects of this kind generated by working, as is known in the example of the ridging phenomenon in α-stainless steel, have a texture developed remarkably in the steel sheet, and several kinds of "specific In many cases, it is caused by the plastic anisotropy, which forms a group of crystal grains composed of crystal orientations (hereinafter referred to as a colony). We have Cr-N
i-type stainless steel strip continuous casting process material, that is, strip slab, cold rolled material, annealed material, product material (as-tempered rolled), detailed texture, metallographic structure, component segregation, etc. The cause of generation of the roughened surface was investigated and clarified as described below.

That is, the roughness of the processed surface of the product is 2.8μ.
As an example, a Cr-Ni-based strip continuous cast piece having a coarse mean γ grain size (about 130 μm) and having a composition in which the Md ₃₀ point of m is 27.3 ° C. will be described below. FIG. 3 shows the crystal orientation distribution (ODF) analysis results of the 1/4 plate thickness layer portion of the product of this material. ψ ₂ = 0 ° (Fig. (A)) and ψ ₂ = 4
As can be seen from the 5 ° (FIG. (B)) cross section, the orientation density is 3.
(A) {112} <111> of 8 and (B) {110} <111> of azimuth density of 3.5 are major azimuths, and these are present in approximately equal amounts (strictly speaking, (A)). Azimuth is {1
12} <111> and {113} <332> in almost the same amount). Also, the roughened surface is within the allowable limit (1.5μ
When the ODF analysis of the conventional process product plate of (m or less) is performed, the orientation density of (A) {112} <111> is 5.5, and the orientation density of (B) {110} <111> is 2.
It was 2. That is, if roughened skin occurs,
(B) It has been found that the orientation density of {110} <111> orientation is relatively increased.

Next, the present inventors have developed a high-intensity monochromatic light (radiant light).
The (110) pole figure by the transmission method was measured by the fine-bundle X-ray method for 0.5 mm × 1.0 mm local regions at a dozen or more adjacent places corresponding to the rough ridge-like undulation pitch of the above-mentioned product with remarkable rough texture. As a result, colonies mainly composed of (A) {112} <111> oriented grains and mainly (B) {110} <111>, {110} <1
It was clarified that colonies composed of 12>, {110} <001> oriented grains are clearly unevenly distributed in different locations adjacent to each other.

At this time, the metal structures of the (A) and (B) oriented colonies were observed, but there was no structural difference between them. In addition, the same measurement was performed on the product plate by the conventional method, but uneven distribution of colonies with a specific orientation was not observed, and (A)
It was confirmed that the (B) -oriented colonies were uniformly dispersed. Further, at this time, the metallographic observation of the sample surface where the (A) and (B) orientation colonies were observed was performed.
And (B) orientation colonies showed no systematic differences. Next, the segregation of components such as Ni and Cr in these regions was examined with an EPMA device capable of two-dimensional element mapping, but no significant difference was observed. From the above results, it is understood that the roughened surface is a phenomenon caused by the crystal orientation.

The {112} and {110} orientations of γ-stainless steel belonging to the face-centered cubic system are uniaxially compressed in parallel to the normal direction of the crystal planes (equivalent to equal biaxial overhanging deformation). It can be assumed) that crystallographically, {112} oriented grains are about 84% of {110} oriented grains.
It is expected to show a yield strength of. In the material (A) {11
2} <111>, {113} <332> oriented grains and (B)
{110} <111>, {110} <112>, {11
When 0} <001> oriented grains form colonies and are nonuniformly present at a coarse region size pitch, it is considered that rough plastic ridges and ridges occur during processing due to their plastic anisotropy.

From this point of view, the present inventors have investigated a crystal orientation topographic X-ray analyzer (X-ray having a beam diameter of 50 μm) in order to clarify the detailed distribution state of the colonies on the product plate surface.
The sample is placed on a rotating sample table with a two-dimensional moving function, and 113 diffracted lines and 22
A device that simultaneously measures the integrated reflection intensity of 0 diffraction line and maps the orientation distribution according to position) with {113} to {112} orientation colonies and {110} in a size area of 10 mm x 10 mm.
The distribution of orientation colonies and the average size of each were analyzed. At this time, assuming that the reflection intensity of the standard sample showing a random azimuth is 1.0, the correspondence with the plate surface position of the X-ray intensity level for each azimuth is schematically shown in FIG.

At this time, the 220 reflection intensity and the 113 reflection intensity change alternately. For example, if the 220 reflection intensity is dominant, the (B) direction colony is set, and if the 113 reflection intensity is dominant, the A direction colony is set. Further, the position where the 220 reflection intensity and the 113 reflection intensity intersect each other was defined as the boundary position of the (A) and (B) oriented colonies. The average dimensions in the rolling direction of colonies A and B measured by this definition are respectively d _RD (A)
And d _RD (B), the average size in the width direction is d
_{Assuming TD} (A) and d _TD (B), the relationship between these values and the roughened surface height of the processed surface is obtained as shown in FIG. That is, both d _RD (A) and d _RD (B) are 300 μm or less, and both d _TD (A) and d _TD (B) are 20
When it is 0 μm or less, the roughened surface height becomes less than the allowable limit (1.5 μm).

As described above, it was found that when the colonies A and B uniformly exist with a size less than a certain critical value, the roughened surface does not occur. The above results showed almost the same tendency at any plate thickness layer portion parallel to the plate surface of the steel plate. The effects of the components of the steel of the present invention will be described below. The steel of the present invention has C + N of 0.09 mass% or less and M
_{d 30 = 413-462 (C + N} ) -9.2Si-8.1
Mn-13.7Cr-18.5Mo-9.5 (Ni + C
u) (each component is mass%) has an Md ₃₀ of 30
It is a Cr-Ni-based stainless steel having a composition of about 60 ° C.

C + N promotes aging cracking accompanying the press working of the product thin plate of the present invention steel, so 0.09 mass%
Below. The relationship between Md ₃₀ and the average γ grain size of the slab and the height of roughened work surface is as shown in FIG. 1, and the reason why such a relationship is observed is summarized below.

The texture of the quenched slab in the present invention is {1
10} <uv0>. That is, the plate surface normal and <001
The> axis is parallel, and the γ-phase crystal grains are rotating around this axis in various directions. When a rapidly cooled slab of a low Md ₃₀ material having an Md ₃₀ point of 30 ° C. or less is cold-rolled, especially when the slab has a coarse grain structure such that the average γ grain size exceeds about 100 μm, unevenness during cold rolling is observed. Deformation is promoted. Further, since the amount of processing-induced martensite generated is relatively small, they are generated in a structurally non-uniform place. Since the martensite phase generated at this time has a BCC crystal structure, this phase shows a so-called α-iron rolling texture by rolling,
The main orientation is {113} <011> α or {332} <113> α. On the other hand, the main orientation of the rolling texture of the γ matrix is {110} <112>. When annealed after cold rolling, the above-mentioned martensite undergoes reverse transformation into a γ matrix. At that time,
The rolling orientation of α iron depends on the K-S orientation relationship, and the γ phase orientations {110} <001>, {110} <112>, {11
0} <111>. Further, from the vicinity of the {110} <112> band structure, which is the rolling direction of the γ phase, {112} <111> or {11} which is the grain growth direction of high temperature annealing.
3} <332> is generated. When the average γ grain size of the slab is coarse, the non-uniformity of deformation during cold rolling is reflected in the localization of cold rolling orientation, which directly affects the annealing texture. As a result, it is considered that {112} oriented colonies and {110} oriented colonies are formed.

On the other hand, even if the same low Md ₃₀ material has a fine grain structure such that the average γ grain size of the slab is less than about 100 μm, the deformation during cold rolling becomes uniform. When such uniform deformation becomes dominant, the texture formation behavior of martensite and γ phase in the early stages of cold rolling and annealing is coarse γ.
If it is almost the same as in the case of grains, martensite is transformed into γ in the vicinity of {112} grains and is generated {11
The frequency of existence of 0} grains increases, and {112} grains become {11
0} grains are eaten and growth is facilitated. As a result, {110}
The development of oriented colonies is suppressed, and a uniform tissue with a relatively developed {112} orientation is formed. Therefore, the roughness of the processed surface in this case is small.

When a rapidly-quenched slab having a composition of Md ₃₀ of about 30 ° C. or more is cold-rolled, the amount of martensite produced during cold-rolling is increased as compared with a low-Md _30- point material, and the martensite is uniformly spread over the entire surface of the cold-rolled structure. Site phase is easily generated. As a result, the texture after annealing develops a relatively large number of {110} orientations,
The development of colonies in which the {112} and {110} orientations are unevenly distributed is suppressed. Especially, the average γ grain size of the cast piece is surely 1
When it is less than 00 μm, the above-mentioned effect works effectively, and the roughened surface becomes very small.

When Md ₃₀ is further raised to about 60 ° C.,
This effect becomes more effective, and the average γ grain size of the slab is 1
Even if the surface roughness is as large as about 50 μm, the roughened surface can be extremely reduced. However, if Md ₃₀ is excessively increased to 60 ° C. or more, the cold workability of the product sheet is deteriorated, so it is necessary to limit this to 60 ° C. or less.

As described in detail above, in the present invention, in order to prevent roughening of the product processed surface, the Md ₃₀ point based on the composition is adjusted within the range of ₃₀ to 60 ° C., and the average γ grain size of the quenched strip slab is adjusted. 150 μm or less, preferably 100 μm
It is necessary to control the following. The present inventors have made various studies on the relationship between the solidification cooling rate of strip slabs, the cooling rate from solidification to 1200 ° C., and the average γ grain size of strip slabs. As a result, the solidification cooling rate of the strip slab of Cr-Ni-based stainless steel having the above composition and having a thickness of 10 mm or less was set to 100 ° C / sec or more, and after solidification, 50 ° C / sec from the highest possible temperature to 1200 ° C. When cooled at a cooling rate of sec or more, the average γ grain size of the obtained cast piece is 100μ.
It was found that it would be less than m.

After being cooled, the strip slab thus produced is subjected to cold rolling and final annealing in the usual manner.
After the final annealing, temper rolling according to a conventional method is performed as necessary. The cold rolling may be performed by one cold rolling step (so-called one-time cold rolling method) from the thickness of the cast slab to the thickness of the final product, or the so-called two times. It may be made by a rolling method. That is, the latter is
Cold rolling is first applied at a working rate of 30% or more, then 1000
After the intermediate annealing is applied at a temperature of up to 1200 ° C, cold rolling is performed to the final plate thickness. The reason for performing cold working of 30% or more is desirable because when the working ratio is less than 30%, the recrystallized structure after the intermediate annealing becomes coarse and colonies that cause roughened work remain in the final product. Because there is no. The intermediate annealing temperature needs to be set within a range from a temperature of 1000 ° C. at which the orientation distribution becomes uniform due to grain growth to a lower limit temperature of 1200 ° C. at which grain coarsening becomes remarkable and colonies remain in the product.

[0030]

【Example】

Example 1 Cr-in which Md ₃₀ based on the composition shown in Table 2 was changed to 5 levels
Ni-based stainless steel (SUS304 steel) was cast by a twin roll type continuous casting machine at a solidification cooling rate of about 300 ° C./sec into a thin strip-shaped slab having a thickness of 2.5 mm.
20 ~ 500 ℃ / sec from 400 ℃ to 1200 ℃
The slabs having various γ grain sizes were obtained by cooling at a cooling rate of. Then, pickling, cold rolling (total rolling rate 76%) and final annealing were performed, and temper rolling was applied to produce a thin plate product. After that, the colony size of the plate surface in the 1/4 plate thickness layer portion of the product was measured by the crystal orientation topography analyzer. Moreover, the cylindrical flat bottom overhanging process of the product (Punch diameter 50 mm,
The overhanging height was 10 mm), and the height of roughened processed surface of the flat bottom was measured. In addition, the workability and aging crackability of the overhanging material were also observed.

[0031]

[Table 2]

The results are shown in Table 3. Md ₃₀ to 30
Regarding the steels of the present invention (Samples 6 and 7) that were heated to ℃ or higher, the processed surface roughness height was all below the allowable limit, which was good, but a comparative example (Sample 8) in which Md ₃₀ was less than 30
The processed surface was poor, and the comparative example (Sample 9) in which Md ₃₀ was 60 ° C. or higher was excellent in processed surface,
The workability was poor. Also, the age cracking property was good for all the samples.

[0033]

[Table 3]

Example 2 The steel of the present invention shown in Table 2 produced under the casting conditions described in Example 1 (Sample 7, average γ grain size of cast slab 106 μm)
Was used to examine the roughness characteristics of the processed surface of the product material by the double rolling method. That is, the slab was pickled, first cold-rolled at a reduction rate of 40%, then subjected to intermediate annealing (1150 ° C., held for 20 seconds), and then cold-rolled to a thickness of 0.6 mm. After that, final annealing annealing and temper rolling were performed, and the roughened surface and other characteristics were examined in the same manner as in Example 1. The results are shown in Table 4. The rough skin was extremely good.

[0035]

[Table 4]

[0036]

As described above, according to the present invention, it is possible to provide a Cr-Ni-based stainless steel thin plate having an excellent surface quality that does not cause roughening of the processed surface by the strip continuous casting manufacturing process.

[Brief description of drawings]

FIG. 1 is a view showing a relationship between a cast slab average γ grain size and a processed surface roughness of a product in comparison with some materials having Md ₃₀ .

FIG. 2 is a diagram showing the relationship between the average waviness width and average waviness length of processed skin roughness and the processed skin roughness height.

FIG. 3 is a diagram showing an analysis result of a crystal orientation distribution (ODF) of a ¼ plate thickness layer portion of a product in which a roughened surface is noticeably observed.

FIG. 4 is a diagram schematically showing a distribution state of colonies.

FIG. 5 is a diagram showing the relationship between the average size of A and B orientation colonies and the height of roughened skin.

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[Procedure amendment]

[Submission date] November 20, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0024

[Correction method] Change

[Correction content]

The texture of the quenched slab in the present invention is {1
0 0} <uv0>. That is, the plate surface normal and <001
The> axis is parallel, and the γ-phase crystal grains are rotating around this axis in various directions. When a rapidly cooled slab of a low Md ₃₀ material having an Md ₃₀ point of 30 ° C. or less is cold-rolled, especially when the slab has a coarse grain structure such that the average γ grain size exceeds about 100 μm, unevenness during cold rolling is observed. Deformation is promoted. Further, since the amount of processing-induced martensite generated is relatively small, they are generated in a structurally non-uniform place. Since the martensite phase generated at this time has a BCC crystal structure, this phase shows a so-called α-iron rolling texture by rolling,
The main orientation is {113} <011> α or {332} <113> α. On the other hand, the main orientation of the rolling texture of the γ matrix is {110} <112>. When annealed after cold rolling, the above-mentioned martensite undergoes reverse transformation into a γ matrix. At that time,
The rolling orientation of α iron depends on the K-S orientation relationship, and the γ phase orientations {110} <001>, {110} <112>, {11
0} <111>. Further, from the vicinity of the {110} <112> band structure, which is the rolling direction of the γ phase, {112} <111> or {11} which is the grain growth direction of high temperature annealing.
3} <332> is generated. When the average γ grain size of the slab is coarse, the non-uniformity of deformation during cold rolling is reflected in the localization of cold rolling orientation, which directly affects the annealing texture. As a result, it is considered that {112} oriented colonies and {110} oriented colonies are formed.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI Technical display location C21D 8/02 D 7412-4K 9/46 Q C22C 38/44 (72) Inventor Shinichi Teraoka Chiba Prefecture 20-1 Shintomi, Futtsu-shi Nippon Steel Corp. Technology Development Division

Claims (3)

[Claims] 1. C + N is 0.090 mass% or less and Md ₃₀ = 413-462 (C + N) -9.2Si-
8.1Mn-13.7Cr-18.5Mo-9.5 (N
i + Cu) (Md ₃₀ defined by mass%)
Has a composition of 30 to 60 ° C., and the average dimension in the rolling direction is d _RD (A) and the average dimension in the sheet width direction is d on an arbitrary plate thickness layer site surface parallel to the plate surface of the steel sheet. _TD (A)
The main crystal orientations are {112} <111>, {11}
3} <332>, the average dimension in the rolling direction is d _RD (B), and the average dimension in the strip width direction is d.
_The main crystal orientation of _TD (B) is {110} <111
>, {110} <112>, and {110} <001> are both present in the steel sheet evenly mixed with each other, and d _RD (A) or d _RD (B) are each 300 μm. It is below, and d _TD (A) or d _TD (B) is 200 μm or less, respectively. 2. C + N is 0.090 mass% or less and Md ₃₀ = 413-462 (C + N) -9.2Si-
8.1Mn-13.7Cr-18.5Mo-9.5 (N
i + Cu) (Md ₃₀ defined by mass%)
Of molten steel having a composition of 30 to 60 ° C. by a continuous casting machine in which the side surface of the mold moves in synchronization with the slab
It is cast into a strip-shaped slab with a thickness of 10 mm or less at a solidification cooling rate of sec or more, and after solidification, it is cooled from the highest possible temperature to 1200 ° C. at a cooling rate of 50 ° C./sec or more, then cold-rolled, and finally. A method for producing a Cr-Ni-based stainless steel sheet having no roughened surface, characterized by performing annealing. 3. The Cr according to claim 2, wherein in the cold rolling, cold rolling with a working rate of 30% or more is performed, and then intermediate annealing is performed at a temperature of 1000 to 1200 ° C., and then cold rolling is performed to a final plate thickness. -A method for manufacturing a Ni-based stainless steel sheet.