JPH01197046A - Production of cr-series stainless steel sheet by using thin thickness casting method - Google Patents

Abstract

PURPOSE:To produce a sheet at low cost by specifying thickness and over- heating temp. of Cr-series stainless steel sheet limiting components. CONSTITUTION:The thin cast sheet having 8-30% Cr, 0.001-0.5% C, 0.001-0.5% N as main components and about 2-4mm thickness is cast at about 1,510-1,600 deg.C. Further, liquids temp. of this composition is 1,480-1,500 deg.C. Annealing and cold-rolling are executed to this and successively finish annealing is executed. Then, condition of the over-heating temp. is 0<=DELTAT<=-45t+200 (wherein DELTAT: over-heating temp. deg.C, (t): thickness of cast sheet mm). Further, it may be applied that suitable contents of Al, Ti, Ni, Zr, B, etc., are added to the above components and the finish annealing is executed under the suitable over-heating temp. By this method, the Cr-series stainless steel sheet can be produced at low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for manufacturing a Cr-based stainless steel thin plate using a thin-wall casting method.

(Prior art) Stainless steel thin plates are disclosed in, for example, Japanese Patent Application Laid-Open No. 55-97430.
As disclosed in the publication, a slab with a thickness of around 200 mm obtained by a continuous casting process is directly rough rolled or heated to a temperature of about 1200°C, and then hot rolled to produce a hot rolled sheet. This is then subjected to hot-rolled plate annealing in a bell-shaped annealing furnace, followed by cold rolling and final annealing to produce a product.

However, when the Cr stainless steel cold-rolled steel sheet manufactured in this manner is subjected to forming processing such as press working, surface irregularities called ridging occur in parallel to the rolling direction.

This phenomenon is thought to be caused by the solidification structure of the slab, that is, coarse columnar crystals.To prevent this, it is possible to improve the solidification structure by changing the composition, casting temperature, electromagnetic stirring, etc., or by hot rolling. Methods such as controlling conditions and heat treatment conditions have been used.

For example, Japanese Patent Application Laid-Open No. 58-32568 proposes a method of completing solidification while maintaining the growth rate of the solidified shell at 0.8 mm/sec or more in the casting process.

On the other hand, a method has been proposed for preventing the occurrence of ridging by reducing the thickness of the cast plate.

For example, Japanese Patent Application Laid-Open No. 62-54017 proposes that the gluing properties of Cr-based stainless steel be improved by casting the plate to a thickness of 30 mm or 10 mm or less and then subjecting it to prescribed cooling, processing, or heat treatment. has been done.

In addition, Japanese Patent Application Laid-open No. 176649/1983 discloses that after casting to a thickness of 5 mm or less using a single roll or twin roll method,
A method has been proposed for producing roving-free ferritic stainless steel by performing annealing, cold rolling, and annealing.

(Problems to be Solved by the Invention) In the conventional technology, when making slabs by continuous casting, the cooling rate is slow, so it is not possible to sufficiently suppress the coarsening of columnar crystals and equiaxed crystals. When using slabs with a plate thickness of about 200 mm, it was difficult to suppress the occurrence of ridging.

On the other hand, in the method of suppressing ridging by making the slab thinner, simply reducing the thickness of the slab lowers the reduction ratio, making it difficult to destroy the solidified structure, and on the contrary, the ridging properties deteriorate.

(Means for Solving the Problems) The present invention solves the problems of the conventional method when manufacturing Cr-based stainless steel thin plates using a thin-wall casting method, and manufactures Cr-based stainless steel thin plates with excellent workability. The object is to provide a method, and the object can be achieved by providing the method as described in the claims. That is, the present invention controls the plate thickness and degree of superheating so as to satisfy a predetermined relational expression when casting thin slabs, and also adds specific elements to control the solidification structure by rolling, This is a method for manufacturing a Cr-based stainless steel thin plate using a thin-wall casting method characterized by performing annealing or rolling treatment followed by cold rolling and final annealing.

The present invention will be explained in detail below.

A first object of the present invention is to provide a method for manufacturing a Cr-based stainless steel thin plate using a thin-wall casting method.

In the production of Cr-based stainless steel "iyJ plate" using the conventional continuous casting method, the cooling rate is slow when making slabs by continuous casting, so it is not possible to sufficiently suppress the coarsening of columnar crystals and equiaxed crystals. Therefore, it was difficult to suppress the occurrence of ridging when such a slab having a plate thickness of about 200 mm was used.

On the other hand, in the method of suppressing ridging by making the slab thinner, simply reducing the thickness of the slab lowers the reduction ratio, making it difficult to destroy the solidified structure, and on the contrary, the ridging properties deteriorate.

The present inventors have developed a Cr-based stainless steel w using a thin-wall casting method.
As a result of repeated research on the manufacturing method of 4 thin plates, we found that in order to improve the gluing characteristics of Cr-based stainless steel FT4 thin plates,
It is necessary to make the size of the colonies (a group of crystal grains with similar orientations) of the finished plate small and randomly dispersed, and to make the crystal grain size relatively small. It was also found that it was necessary to make the grains finer.

In other words, in the thin-wall casting process, it is important to not only refine the structure through rapid cooling but also to increase the equiaxed crystallinity, and for this purpose it is necessary to control the thickness of the cast plate, the degree of superheating, and the composition. becomes.

The solidification rate increases as the plate thickness decreases, and as a result, the solidified structure becomes finer grained. On the other hand, as the degree of superheating decreases, equiaxed crystallization becomes easier. Therefore, the conditions for equiaxed grain formation depend on the plate thickness and degree of superheating. becomes a function of At this time, since the solidification rate is affected by the mold material, copper, iron, etc. with high thermal conductivity are preferable, but other materials with similar thermal conductivity may be used without any problem.

This tendency is common in ordinary Cr-based stainless steels, with Cr: 8 to 30%, C: 0.001 to 0.5%,
When producing thin slabs of Cr-based stainless steel whose main component is N: 0.001 to 0.5% and the remainder is substantially Fe, the degree of superheating is determined between the molten steel temperature and the liquidus temperature of the molten steel components. Defined as the difference between plate thickness and degree of superheating, the relationship between plate thickness and degree of superheating is O≦∆T≦-45t+200 ∆T: degree of superheating (°C) t: slab thickness (mm) An equiaxed fine-grained structure can be obtained.

By the way, in order to equiaxed the solidified composite fibers, it is necessary to generate equiaxed nuclei in the molten steel immediately before solidification. Although the generation of solidification nuclei is promoted by lowering the molten steel temperature, it is considered that if heterogeneous nuclei can be generated, the equiaxed crystallinity can be increased even at a higher degree of superheating. The inventors investigated various elements and found that jV, Ti
, Nb, Zr, B, etc. were found to be effective.

That is, Cr: 8-30%, C: 0.001-0.5
%, N: 0.001 to 0.5% as the main component, AN
? 0.01-0.5%, Ti2 0.01-1:o%
, Nb: 0.01-1.0%, Zr: 0.01-1.0
%, B: 0.0003 to 0.01%, one or more elements are added, and the balance is essentially Fe. The relationship is: 0≦ΔT≦−at+b ΔT: degree of superheat (°C) L: slab thickness (mill) Al: a=40, b=180 Ti: a=35, b=24 O Nb: a=25, b=200 Zr: a=20, b=140 B: a=35, b=200 By casting under conditions that satisfy the following, the desired equiaxed fine grain structure can be obtained. At this time, when several types of elements are added, it is desirable to determine the coefficients by weighting them according to the amounts added.

That is, jV, Ti, Nb, and Zr are added in weight %,
The weight of B is 100 times the weight% of the added amount, and A
Find the ratio of each element to all added elements such as l, Ti, etc.
The coefficients a and b may be calculated according to the ratio.

Here, 7V generates Al z 03, which is considered to become a foreign nucleus. If the amount added is less than 0.01%, the effect will be small, and if it exceeds 0.5%, the effect will be saturated and the economic benefit will be reduced, so it was set to 0.01 to 0.5%.

It is thought that Ti generates TiN, which becomes a foreign nucleus. If the amount added is less than 0.01%, the effect will be small;
If it exceeds 1.0%, the effect will be saturated and the economical benefits will be reduced, and the vortex flow will deteriorate and castability will deteriorate, so the content was set at 0.01 to 1.0%.

Nb generates NbN, NbO, NbOx, etc., which are considered to be foreign nuclei. This addition amount is 0.01%
If it is less than 1.0%, the effect will be small, and if it exceeds 1.0%, the effect will be saturated and the economical benefits will be small, and the eddy flow will deteriorate and the castability will deteriorate, so the content was set at 0.01 to 1.0%.

It is thought that Zr produces ZrzO and ZrN, which become heterogeneous nuclei. If the amount added is less than 0.01%, there will be little effect, and if it exceeds 1.0%, oxides will increase in the molten steel, deteriorating the castability and properties of the finished plate.
01 to 1.0%.

B produces BN, 8203, which is considered to be a foreign nucleus. If the amount added is less than 0.0003%, the effect will be small, and if it exceeds 0.01%, a large amount of boride will be generated in the steel, which will significantly impair hot workability.
It was set at 3 to 0.01%.

The solidified structure of slabs cast under conditions that satisfy these component ranges and conditional expressions has equiaxed crystals with a grain size of 200 μm or less accounting for 50% or more, and Cr stainless steel thin sheets using this as a starting material are , exhibits excellent quenching properties.

Furthermore, by equiaxed crystallizing and fine-graining the solidified structure, deep drawability is also improved. This is because grain refinement increases the grain boundary area that becomes the site of recrystallization nuclei, and equiaxed crystallization randomizes the solidified grain orientation, resulting in (1)
This is because the 00) direction decreases and the 111) direction becomes the main direction.

A second object of the present invention is to prevent cracking and improve deep drawability when manufacturing Cr-based stainless steel thin plates using the thin-wall casting method. Normally, Cr stainless steel has two phases, α phase and γ phase, in the high temperature range.
When cooled as is, the γ phase remains in the α phase as a hard phase. This hard phase inhibits cold rolling properties, causing cold rolling cracks, and also causes a reduction in the deep drawability of the finished sheet.

According to the present invention, the strip obtained by the thin-wall casting method is annealed or rolled up at a temperature of 700° C. or more and 1000° C. or less, and then subjected to the steps after cold rolling.

In this case, annealing is not economically advantageous at temperatures below 700°C because it takes a long time to decompose the hard phase;
At temperatures above 700°C, the γ phase precipitates.
The above temperature is 1000°C or less. Also, for the same reason, winding is performed at a temperature of 700° C. or higher and 100° C. or lower.

Further, the present invention discloses a method in which at least one pass of rolling is performed in a temperature range of 150° C. or higher and 1300° C. or lower, and then annealing or rolling is performed under the above conditions, and then the process is subjected to cold rolling and subsequent steps. There is. The purpose of this is to promote the decomposition of the γ phase by introducing working strain, and at the same time to improve the cold rollability and ductility of the finished sheet by compressing casting defects.

Next, examples of the present invention will be described.

Example 1 Cr-based stainless steel with the components shown in Table 1 was cast using copper and iron molds at a casting temperature of 1510 to 1600°C and a plate thickness of 2 to
A thin slab with a thickness of 4 n++++ was cast, and its structure was observed using an optical microscope. The liquidus temperature of the component is approximately 1480-1500°C.

The results are shown in FIGS. 1(a) to 1(a). The structure of the slab cast in this manner becomes finer as the plate thickness becomes thinner and as the casting temperature becomes lower, and the equiaxed crystallinity also becomes higher. Also, A
! By adding , Ti, Nb, Zr, and B, the range of equiaxed grains shifts to the thick side and high temperature side.

Example 2 Cr-based stainless steel with the components shown in Table 2 was cast using copper and iron molds at a casting temperature of 1510 to 1600°C and a plate thickness of 2 to 300°C.
After casting into a thin slab in the range of 4 mm, it was annealed at 840°C for 4 hours, cold rolled to 80%, and annealed at 875°C for 1 minute to prepare a test material, and then a ridging test was conducted. . The liquidus temperature of the component is approximately 1480-1500℃
It is.

The results are shown in Table 3. Materials with equiaxed crystals and fine grains have good gluing characteristics, while those with the same grain size but with a columnar crystal structure have poor gluing characteristics. In terms of casting conditions, the thinner the plate thickness and the lower the degree of superheating, the better the ridging properties.

This result shows that even when held at 750℃ for 1 hour after casting,
The same result was obtained when 30% hot rolling was performed after casting.

(Effects of the Invention) As detailed above, according to the present invention, a thin Cr-based stainless steel sheet with good cold rollability, ridging properties, and deep drawability can be produced extremely easily and at low cost using a thin-wall casting method. The industrial effect is great.

[Brief explanation of the drawing]

FIGS. 1(a) to 1(h) show the relationship between plate thickness and casting temperature on crystal grain size of Cr-based stainless steel casting material. In the figure, the numbers indicate the crystal grain size in μm, and the symbols indicate that a circle indicates an equiaxed crystal ratio of 50% or more, and a triangle indicates an equiaxed crystal ratio of less than 50%. Figure 1 Clothes 屡 Cmyyt> J! L Shoulder (mm) (,2) (4
') Solder thickness (mm) Plate layer (mm
) (C) (Revised) Figure 1 $4 (mn) Board s<ynm> (e) (f) (?) (Phantom procedural amendment (voluntary) March 9, 1986 1, case display Showa 1963 Patent Application No. 22115 2, Name of the invention: Method for manufacturing Cr-based stainless steel thin plate using thin-wall casting method 3, Relationship with the person making the amendment case Patent applicant: 2-6-3 Otemachi, Chiyoda-ku, Tokyo (665) Nippon Steel Corporation Representative Yutaka Saito 4, Agent 4-1-6, Marunouchi-dori-chome, Chiyoda-ku, Tokyo 100, Subject of amendment explanation(
1)! The scope of claims is amended as shown in the attached sheet. (2) Delete 5 lines "30 mm or more" from the bottom of page 8 of the specification. (3) 5 lines from the bottom of page 15, “Equiaxed crystal” is changed to “Equiaxed crystal ga”
Correct to. (4) Page 16, lines 3-4 r (1oo) The direction is decreasing and 1
11) Correct the direction J to r(100)<OVW>direction decreases.111) <UVW>direction decreases. (5) Claims characterized by "recrystallization and" after "by introduction" on page 17, line 6 (1) Cr: 8-30%, C: 0.001-0
．． 5%, N:O,OO1-0.5% as main components,
The relationship between the plate thickness and the degree of superheating (the degree of superheating is defined as the difference between the temperature of the molten steel and the liquidus temperature of the molten steel components; the same applies hereinafter) for the steel in which the remainder is substantially Fe is 0≦ΔT≦−. 45t+200 ΔT: degree of superheating ("C) t: slab thickness (mm) A thin-walled casting method characterized by subjecting a thin strip cast under conditions satisfying the following conditions to annealing, cold rolling, and then final annealing. Manufacturing method of Cr-based stainless steel thin plate using (2) Cr: 8-30%, C: 0.001-0.5%
, N: 0.001 to 0.5% as the main component, Al
: 0.01-0.5%, Ti: 0.01-1.0%,
Nb: 0.01-1.0%, Zr: 0.01-1.0
%, B: Steel to which one or more elements from 0.0003 to 0.01% are added, and the remainder substantially consists of Fe, where the relationship between plate thickness and degree of superheat is 0≦ΔT≦−at+b ΔT: degree of superheat (℃) t: slab thickness (an) Al: a=40, b=180 Ti: a=35, b=24 O Nb: a=25, b=200 Zr: a-20, b=140 B: Cr-based stainless steel using a thin-wall casting method characterized by annealing and cold rolling a thin strip cast under conditions satisfying the following conditions: a=35, b=200, and then subjecting it to finish annealing. Manufacturing method of thin plate (3) Cr: 8-30%, C: 0.001.~
0.5%, N: 0.0 The main component is O1~0.5%, and the remainder is substantially Fe. The relationship between plate thickness and degree of superheating is 0≦ΔT≦−45t+200 ΔT: Overheating L: Thickness of slab (M)
It is rolled up and cold rolled without annealing in the temperature range of
Method for manufacturing a Cr-based stainless steel thin plate using a thin-walled casting method characterized by subsequent finish annealing (4) Cr: 8 to 30%, C: 0.001 to O
, '5%, N: 0.001-0.5% as main component, A7: 0.01-0.5%, Ti: 0.01-1
．． 0%, Nb: 0.01-1.0%, Zr: 0.01
~1.0%, B: One or more elements from 0.0003 to 0.01% are added, and the remainder is substantially Fe.
The relationship between plate thickness and degree of superheat is 0≦ΔT≦−a
t+b ΔT: Degree of superheat (℃) t: Slab thickness (Sono) iV: a=40, b=180 Ti: a=35, b=24 O Nb: a-25, b=200 Zr: a=20 , b = 140 B : A = 35, b = 200
It is rolled up and cold rolled without annealing in the temperature range of
Method for manufacturing a Cr-based stainless steel thin plate using a thin-wall casting method characterized by subsequent finish annealing (5) Cr: 8-30%, C: 0.001-0
．． 5%, N: 0.001 to 0.5% as the main component,
The remainder of the steel was essentially made of Fe, and was cast under conditions such that the relationship between plate thickness and degree of superheat satisfied the following: O≦∆T≦-45t+200 ∆T: degree of superheat ("C) t: slab thickness (IIIll) Thin ribbon, 150-1300℃
A method for manufacturing a Cr-based stainless steel thin plate using a thin-wall casting method (6), which is characterized by performing at least one pass of rolling in a temperature range of 100 to 1000 ml, rolling it up, annealing, cold rolling, and then final annealing. Cr: 8-30%, C: 0.001-0
．． 5%, N:O,OO1-0.5% as main components,
A! : 0.01-0.5%, Ti: 0.01-1.0
%, Nb: 0.01-1.0%, Zr: 0.01-1
．． 0%, B: Steel to which one or more elements from 0.0003 to 0.01% are added, and the remainder substantially consists of Fe, where the relationship between plate thickness and degree of superheating is 0≦ΔT≦- at+
b ΔT: Degree of superheat (℃) t: Slab thickness (M) jlJ: a=40, b=180 Ti: a=35, b=24 O Nb: a=25, b=200 Zr: a=20Sb = 140 B: A ribbon cast under the conditions satisfying a-35, b = 200 was heated at 150 to 1300°C.
A method for manufacturing a Cr-based stainless steel thin plate using a thin-wall casting method (7), which is characterized by performing at least one pass of rolling in a temperature range of 100 to 1000 ml, rolling it up, annealing, cold rolling, and then final annealing. Cr: 8-30%, C:O, OO1-0.
5%, N: O, OO 1 to 0.5% as the main components, and the remainder substantially Fe. ) t: Thickness of slab
At least one pass of rolling in a temperature range of 700
Manufacturing method of Cr-based stainless steel W4 thin plate using a thin-wall casting method characterized by rolling in a temperature range of ~1000°C, cold rolling without annealing, and then finish annealing (8) Cr: 8-30 %, C: 0.001-0.5%
, N: 0.001 to 0.5% as the main component, N:
0.01-0.5%, Ti: 0.01-1.0%, N
b: 0.01-1.0%, Zr: 0.01-1.0%
, B: Steel to which one or more elements from 0.0003 to 0.01% are added, and the remainder substantially consists of Fe, where the relationship between plate thickness and degree of superheat is 0≦ΔT≦−a t+b ΔT: degree of superheating C) t: slab thickness (mm) Al: a=40, b=180 Ti: a-35, b=24 O Nb: a=25, b=200 Zr: a=20, b = 140 B: A ribbon cast under conditions satisfying a = 35, b = 200 is heated at 700 to 1300°C.
At least one pass of rolling in a temperature range of 700
A method for manufacturing Cr-based stainless steel TF4 thin plate using a thin-wall casting method characterized by rolling in a temperature range of ~1000°C, cold rolling without annealing, and then final annealing.

Claims (8)

[Claims] (1) Cr: 8-30%, C: 0.001-0.5%,
A steel whose main component is N: 0.001 to 0.5%, and the remainder is substantially Fe, is prepared by measuring the plate thickness and degree of superheating (the degree of superheating is defined as the difference between the temperature of the molten steel and the liquidus temperature of the molten steel components). The following relationship is established: 0≦∆T≦-45t+200 ∆T: degree of superheat (°C) t: slab thickness (mm) A method for manufacturing a Cr-based stainless steel thin plate using a thin-wall casting method, which is characterized by performing finish annealing. (2) Cr: 8-30%, C: 0.001-0.5%,
Main component is N: 0.001 to 0.5%, Al: 0.0
1-0.5%, Ti: 0.01-1.0%, Nb: 0.
01-1.0%, Zr: 0.01-1.0%, B: 0.
The relationship between plate thickness and degree of superheat is 0≦∆T≦-at+b ∆T: degree of superheat (°C). ) t: Slab thickness (mm) Al: a=40, b=180 Ti: a=35, b=240 Nb: a=25, b=200 Zr: a=20, b=140 B: a= 35, a method for manufacturing a Cr-based stainless steel thin plate using a thin-wall casting method, characterized in that a thin strip cast under conditions satisfying b=200 is subjected to annealing, cold rolling, and then final annealing. (3) Cr: 8-30%, C: 0.001-0.5%,
The relationship between plate thickness and degree of superheat is as follows: 0≦∆T≦-45t+200 ∆T: degree of superheat (°C) t: Thin strips cast under conditions that satisfy the slab thickness (mm) are heated at 700 to 1000℃.
It is rolled up and cold rolled without annealing in the temperature range of
A method for manufacturing a Cr-based stainless steel thin plate using a thin-wall casting method, which is then subjected to finish annealing. (4) Cr: 8-30%, C: 0.001-0.5%,
Main component is N: 0.001 to 0.5%, Al: 0.0
1-0.5%, Ti: 0.01-1.0%, Nb: 0.
01-1.0%, Zr: 0.01-1.0%, B: 0.
The relationship between plate thickness and degree of superheat is 0≦∆T≦-at+b ∆T: degree of superheat (°C). ) t: Slab thickness (mm) Al: a=40, b=180 Ti: a=35, b=240 Nb: a=25, b=200 Zr: a=20, b=140 B: a= 35, the ribbon cast under conditions satisfying b=200 was heated at 700 to 1000°C.
It is rolled up and cold rolled without annealing in the temperature range of
A method for manufacturing a Cr-based stainless steel thin plate using a thin-wall casting method, which is then subjected to finish annealing. (5) Cr: 8-30%, C: 0.001-0.5%,
The relationship between plate thickness and degree of superheat is as follows: 0≦∆T≦-45t+200 ∆T: degree of superheat (°C) t: Thickness of the slab (mm) The ribbon was cast under the conditions of 150 to 1300℃.
A method for manufacturing a Cr-based stainless steel thin plate using a thin-wall casting method, which is characterized by performing at least one rolling pass in a temperature range of (6) Cr: 8-30%, C: 0.001-0.5%,
Main component is N: 0.001 to 0.5%, Al: 0.0
1-0.5%, Ti: 0.01-1.0%, Nb: 0.
01-1.0%, Zr: 0.01-1.0%, B: 0.
The relationship between plate thickness and degree of superheat is 0≦∆T≦-at+b ∆T: degree of superheat (°C). ) t: Slab thickness (mm) Al: a=40, b=180 Ti: a=35, b=240 Nb: a=2, b=200 Zr: a=20, b=140 B: a= 35, the ribbon cast under conditions satisfying b=200 was heated at 150 to 1300°C.
A method for manufacturing a Cr-based stainless steel thin plate using a thin-wall casting method, which is characterized by performing at least one rolling pass in a temperature range of (7) Cr: 8-30%, C: 0.001-0.5%,
The relationship between plate thickness and degree of superheat is as follows: 0≦∆T≦-45t+200 ∆T: degree of superheat (°C) t: Thickness of the slab (mm) The ribbon was cast under the conditions of 150 to 1300℃.
At least one pass of rolling in a temperature range of 700
A method for manufacturing a Cr-based stainless steel thin plate using a thin-wall casting method characterized by rolling in a temperature range of ~1000°C, cold rolling without annealing, and then final annealing. (8) Cr: 8-30%, C: 0.001-0.5%,
Main component is N: 0.001 to 0.5%, N: 0.01
~0.5%, Ti: 0.01~1.0%, Nb: 0.0
1-1.0%, Zr: 0.01-1.0%, B: 0.0
The relationship between plate thickness and degree of superheat is 0≦∆T≦-at+b ∆T: degree of superheat (°C). ) t: Slab thickness (mm) Al: a=40, b=180 Ti: a=35, b=240 Nb: a=25, b=200 Zr: a=20, b=140 B: a= 35, the ribbon cast under conditions satisfying b=200 was heated at 150 to 1300°C.
At least one pass of rolling in a temperature range of 700
A method for manufacturing a Cr-based stainless steel thin plate using a thin-wall casting method characterized by rolling in a temperature range of ~1000°C, cold rolling without annealing, and then final annealing.