JPH1099911A - Hot rolled austenitic stainless steel sheet excellent in corrosion resistance and adhesibility of scale and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot rolled austenitic stainless steel sheet which is excellent, especially, in corrosion resistance in a part to be worked and, moreover, which has excellent adhesibility of scale that scale peeling at the time of working such as bending and pressing remains at a harmless level and its manufacturing method. SOLUTION: This stainless steel sheet is the hot rolled austenitic stainless steel sheet the thickness of scale on the surface of which is <=1.0μm and whose Ccr ratio (=Ccr /(CFe +Ccr )) which is determined by Fe and Cr contents CFe , Ccr in the scale is >=0.40. At the time of hot rough rolling a slab, executing descaling, executing finish rolling and coiling it into a coil shape, by preferably executing local gas purge to the over-filling part from the finishing rolls, the sheet is held in an atmosphere whose oxygen-content is <=1.0vol.%, coiled at 900 deg.C and the stainless steel sheet is manufactured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot-rolled austenitic stainless steel sheet having excellent corrosion resistance and scale adhesion and a method for producing the same, and more particularly, to the formation of a surface oxide scale during hot rolling is greatly suppressed. The present invention relates to a hot-rolled austenitic stainless steel sheet having excellent corrosion resistance and scale adhesion that can be used without descaling after pickling and the like, and a method for producing the same.

[0002]

2. Description of the Related Art In hot rolling of a steel strip, generally, a steel slab extracted after heating in a heating furnace is removed from a primary scale, and then subjected to a rough rolling facility consisting of several stages of rolling mills to have a thickness of 20 to 40 mm.
Roughly hot-rolled to a semi-finished product called a sheet bar of about mm, and after removing the secondary scale of this sheet bar by a descaling device, finish-rolling by a finishing rolling facility consisting of several rolling mills Then, a step of controlling and cooling the steel strip with a cooling device to prepare a predetermined material, and then winding the steel strip into a coil shape is adopted.

[0003] Since all the steps of hot rolling are carried out in the atmosphere, an oxide film (also simply called scale) is formed on the surface of the hot-rolled steel strip despite the removal of scale before finish rolling. You. When cold-rolling a hot-rolled steel strip having this scale, it peels off during rolling and bites into the steel surface, resulting in a reduction in surface quality. Further, before that, it is usual to remove the scale by mechanically descaling such as shot blast or the like, and this scale removal step is one of the factors for increasing the cost.

[0004] In order to eliminate this cost increase factor, as a hot rolling method aiming at ultra-thin scale, a section passing through a steel strip from the exit side of the final stand of the hot finishing mill to the winding machine is inert gas or reduced. There have been proposed several methods for suppressing the scale formation of the steel strip until it is wound after finishing hot rolling by covering with a box controlled in a neutral gas atmosphere (for example, Japanese Patent Application Laid-Open Nos. 58-53323 and 58-53323). 59-97710, JP-A-61-123403, etc.). These are scales that have been removed before hot rolling and the remaining scale is finally formed between the final rolling and winding, and if it is kept in a non-oxidizing atmosphere during that time, the scale can be made extremely thin. It is based on the technical idea that it can be done.

[0005] However, this method has a disadvantage that it is necessary to supply a large amount of gas for gas sealing in a long section from the exit side of the final rolling mill to the winding machine, and it is difficult to put it into practical use. It is extremely difficult to suppress scale formation to such a thickness that acid washing can be omitted. On the other hand, based on the knowledge that the scale before hot rolling is not removed at the time of hot rolling and is rolled at a rate substantially equal to the rolling reduction, the rolling mill row having a relatively low rolling temperature and therefore a small scale generation speed is used. It has been proposed to increase the rolling reduction in the later stage, spread the scale formed in that stage thinly, and cool and wind the portion after the finish rolling mill on the outgoing side in an inert gas atmosphere (Japanese Unexamined Patent Publication No. -266401). However, according to this, there is a problem in that a large amount of rolling reduction is required in the latter stage of the finish rolling mill having a low temperature, and the addition of a rolling mill is large, thereby limiting the thickness of the finally rollable sheet.

[0006] A method has also been proposed in which the space between the stands of a hot finishing rolling mill is placed in an inert gas atmosphere, and the surface scale is removed near the entry side of the rolling mill and rolling is performed (Japanese Patent Laid-Open No. 4-66203). Reference). However, not only does the amount of inert gas used to place the entire space between the finishing stands in an inert gas atmosphere become enormous, but also the space between the stands is covered with a box. There is a problem that a great deal of labor and time are required for recovery in the event of occurrence of a trouble such as breakage, and the productivity is greatly impaired.

[0007] Furthermore, all of these prior arts are directed to ordinary steel or low carbon steel, and do not relate to stainless steel in which surface quality and corrosion resistance are particularly important. In stainless steel, the amount of scale generated during hot rolling is slightly smaller than that of low carbon steel, etc.
In most cases, it cannot be used as it is, and must be pickled. Since stainless steel has poor descaling properties compared to ordinary steel, it is necessary to customize special pickling equipment.Furthermore, the pickling speed is slower than that of low carbon steel, etc. Manufacturing costs have to be high.

[0008]

As described above, although attempts have been made to reduce the thickness of a hot-rolled steel sheet, there is still no technique that satisfies productivity and cost and is practical. Furthermore, no measures have been taken to reduce the thickness of hot-rolled steel sheets to stainless steel, and no practical example has been found.

[0009] In addition to containing a large amount of expensive metal elements such as Cr and Ni, stainless steel has a poor pickling property as compared with ordinary steel, and requires special pickling equipment. Is also very expensive because productivity is limited due to slow speed. Therefore, even if it has characteristics superior to ordinary steel in terms of corrosion resistance, aesthetics, etc., its use is often limited in terms of cost at present.

[0010] If a hot-rolled steel sheet that does not undergo an acid washing step can be provided for applications in which the surface properties of stainless steel are not regarded as a problem, use restrictions in terms of cost should be greatly eased. However, at present, annealing (generally performed before pickling) -a hot-rolled stainless steel sheet that has not been subjected to pickling (hereinafter referred to as "black scale material" as appropriate), when subjected to bending or pressing, the surface of the steel is processed by processing. There is a problem in that the scale is partially peeled off, and the mold is damaged or dust is generated, thereby deteriorating the working environment. Furthermore, regarding corrosion resistance,
It is inferior to a normal stainless steel pickled plate or cold rolled plate, and there is a problem that the corrosion resistance of a portion that has been subjected to processing such as bending or pressing is particularly poor.

In view of the above-mentioned problems of the prior art, the present invention provides:
The generation of surface oxide scale is greatly suppressed, and compared with the conventional black scale materials, the corrosion resistance of the processed part is particularly excellent, and the scale peeling at the time of processing such as bending and pressing is at a level that does not pose a problem It is an object of the present invention to provide an austenitic stainless hot-rolled steel sheet having improved scale adhesion and a method for producing the same.

[0012]

In order to achieve this object, the present inventors have studied the effects of hot rolling conditions, particularly the hot rolling atmosphere, on the formation of surface oxide scale on hot-rolled stainless steel sheets, especially on hot-rolled austenitic stainless steel sheets. As a result of a detailed study, the formation and growth of oxide scale is greatly affected by the oxygen concentration in the atmosphere at the start of the finish rolling roll, especially in the hot rolling process.In addition, the corrosion resistance and scale adhesion of the black scale material are affected by the scale. A new and important finding that thickness and scale composition are dominant has been obtained.

The present invention has been completed based on such findings.
The scale thickness of the surface is 1.0 μm or less.
The concentrations of Fe and Cr in the scale _Fe, C_CrMade
Where C is defined below_CrThe ratio is 0.40 or more.
Austen with excellent corrosion resistance and scale adhesion
It is a hot rolled stainless steel sheet.

C _Cr ratio = C _Cr / (C _Fe + C _Cr ) In the present invention, the slab is hot-rolled roughly, descaled, finish-rolled, and wound into a coil to finish the slab. Austenitic stainless steel with excellent corrosion resistance and scale adhesion, characterized by maintaining the atmosphere at an oxygen concentration of 1.0 vol% or less and winding up at 900 ° C or less, preferably by local gas purging of the roll roll extruded portion. This is a method for producing a rolled steel sheet.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a description will be given of a research experiment which triggered the present invention. FIG. 1A is a schematic side view of the test rolling mill used in this experiment, and FIG. 1B is a partial schematic plan view of the test rolling mill with the upper rolling roll removed in FIG. After heating in the furnace 1, rolling is performed by the rolling roll 2, and then, after cooling in the cooling water spraying device 3, the material is charged into the soaking furnace 4 and maintained at a uniform temperature, so that the finishing hot rolling process can be simulated. ing. Test material 10 is biting wire 10A
Is rolled down by the rolling rolls 2 from the wire to the start line 10B. Reference numeral 5 denotes a gas nozzle for controlling the atmosphere in the protruding portion (in the vicinity of the protruding line 10B), 6 denotes an oxygen meter for measuring the oxygen concentration in this atmosphere, and 6A denotes an oxygen sensor.

Using this test rolling mill, the relationship between the atmosphere during hot rolling and the surface scale formation behavior was examined. Austenitic stainless steel of 18wt% Cr-8.3wt% Ni was used as a test material. An initial thickness of 10mm was wrapped with a stainless steel foil, and charged into a heating furnace 1 filled with Ar gas and made into a non-oxidizing atmosphere. And heated at 1020 ° C. After heating, just before rolling, remove the test material 10 from the foil and roll
And rolled at a rolling temperature of 1000 ° C. and a reduction of 50% in one pass to change the atmosphere of the extruded portion in various ways. The test material (hot-rolled sheet) 10 after rolling is cooled by a cooling water spray device 3. After cooling by changing the water injection amount, after winding, the atmosphere is adjusted to an oxygen concentration of 3.0 vol% (remainder N ₂ ) equivalent to the atmosphere inside the coil, and maintained in a soaking furnace 4 maintained at various temperatures for 2 hours. The winding conditions were simulated, and the thickness of the scale formed on the surface of the hot-rolled sheet 10 having undergone this process was investigated.

The change of the atmosphere of the biting portion is performed by the oxygen meter 6.
While monitoring the (oxygen sensor 6A is placed at a distance 200mm downstream from chewing out line 10B) oxygen concentration, thereby ejecting N ₂ gas by changing the flow rate from the gas nozzle 5 was carried out by local gas purge . According to this method, the oxygen concentration at the biting portion can be arbitrarily and easily controlled within a range from 0.1 vol% to the atmospheric concentration. The measured value of the oxygen meter 6 did not differ significantly when the distance of the oxygen sensor 6A from the starting line 10B was changed in the range of 50 to 500 mm, but the measured value became higher when the distance was larger than that.

The scale thickness of the hot-rolled sheet was measured by an SEM observation image of a cross section. For example, FIG. 2 is a graph showing the relationship between the concentration of oxygen at the extraction portion and the thickness of the scale when the soaking temperature is 750 ° C. after cooling. It can be seen that the scale thickness can be significantly suppressed by suppressing the oxygen concentration to 1.0 vol% or less.

For example, FIG. 3 is a graph showing the relationship between the soaking temperature after cooling and the scale thickness when the oxygen concentration at the biting portion is controlled to 1.0 vol%. However, the scale growth rate increases and the scale thickness increases, but the effect of the holding temperature is slightly smaller than the effect of the oxygen concentration at the extruded portion. It can be seen that the scale thickness can be suppressed to 1.0 μm or less at a temperature of 900 ° C. or less.

Incidentally, it is assumed that such a phenomenon of suppressing the scale thickness is based on the following mechanism. In other words, in addition to the oxidizing atmosphere and temperature, the strain introduced during rolling also acts as a driving force for scale generation and growth, but the rolled material in which the oxygen concentration in the extruded portion is suppressed recovers from the introduction of strain. It is considered that the rapid generation and growth of the scale was suppressed by passing through a short time zone in which the hot rolling strain before release could act as a driving force, protected by the non-oxidizing atmosphere.

On the other hand, when these scales were analyzed by AES, X-ray diffraction, TEM, etc., the oxides detected were mainly (Fe, Cr) ₂ O ₃ and
Although it was (Fe, Cr) ₃ O ₄ , the Cr concentration in the scale tended to increase under the condition that the oxygen concentration in the extruded portion was 1.0 vol% or less. When the Cr concentration in the scale became a certain value or more, it was found that the scale adhesion and the corrosion resistance of the hot-rolled sheet having the same scale thickness were further improved as shown in the experimental examples described later.

It is considered that the reason why the Cr concentration in the scale is increased as described above is that the oxidation rate of Cr having an oxide generation energy lower than that of Fe increases under conditions of low oxidation ability. The present inventors have developed a technology that can effectively suppress the surface scale of an austenitic stainless steel hot-rolled steel sheet without significantly modifying a conventional hot-rolling facility, based on the above findings obtained in such research experiments. As a result of intensive studies on the relationship between the scale thickness and scale composition of the austenitic stainless steel hot-rolled steel sheet and the scale adhesion and corrosion resistance, it was found that there is a close relationship between the two and the present invention. Was completed.

Next, the reasons for limiting the requirements of the present invention will be described. (1) Scale thickness 1.0 μm or less: The corrosion resistance of austenitic stainless steel hot-rolled steel sheet (black scale material) largely depends on the base alloy composition, but it is also found that the corrosion resistance greatly changes depending on the composition and thickness of the surface scale. That is, when the C _Cr ratio, which is representative of the scale composition, is in a preferred range described below, the corrosion resistance is improved when the scale thickness is reduced, and the effect becomes remarkable at 1.0 μm or less.

The scale adhesion (hard-to-peel off during processing) of the black scale material is also greatly affected by the C _Cr ratio and the scale thickness. When the C _Cr ratio is within a preferred range described later, the scale thickness becomes thinner. The scale adhesion is improved, and the effect becomes remarkable when the scale thickness is 1.0 μm or less. Therefore, in order to remarkably improve both the corrosion resistance and scale adhesion of the scale material, the scale thickness needs to be 1.0 μm or less.
When the scale thickness is 0.5 μm or less, the appearance is a temper color and the surface gloss is further improved. Therefore, the more preferable range of the scale thickness is 0.5 μm or less. Since there is no scale at all, there is no particular need to set a lower limit for the scale thickness. (2) C _Cr ratio 0.40 or more: The corrosion resistance (especially the corrosion resistance of the processed portion) and scale adhesion of the black scale material greatly depend on the C _Cr ratio together with the scale thickness described above, and the scale thickness is 1.0 μm.
When the C _Cr ratio is 0.40 or more at m or less, both corrosion resistance and scale adhesion are improved.

An experimental example supporting this is described below. Specimens A to SUS304 hot-rolled (1.5 mm thick) were pickled and scales were removed once, and then heat-treated in air under the conditions shown in Table 1 to adjust the scale thickness to about 0.7 µm.
D and SUS304 material (10 mm thick) were hot rolled (50% reduction in one pass) and cooled in the same manner as in the above research and experiment, except for the conditions shown in Table 2 using the test rolling equipment shown in FIG. Specimen E, which was soaked to adjust the scale thickness to about 0.7 μm,
Prepare F, and for these test materials, scale thickness,
The C _Cr ratio, corrosion resistance, and scale adhesion during processing were examined. Sample E was hot rolled in air and had a scale thickness of 0.7 μm.
Rolling temperature 600 ° C, winding temperature (C
T) Rolled at 400 ° C, much lower than normal austenitic stainless steel.

The scale thickness was determined by cooling and breaking the sampled plate in liquid nitrogen and observing the cross section by SEM. C
C _Cr and C _Fe for deriving the _Cr ratio were obtained from the peak intensity ratio by AES analysis of the scale of the sample surface. Regarding the corrosion resistance, a 50 mm x 100 mm test piece was bent at an angle of 90 °, and then a salt-dry / wet combined cycle corrosion test (30 cycles) was performed using a 5% NaCl aqueous solution under the conditions shown in Table 3.
After the test, the bent portion and the unprocessed portion were visually observed and evaluated according to the grades shown in Table 4.

The scale adhesion during processing (processed scale adhesion) was evaluated based on the amount of scale peeled during processing. This amount is measured in the gauge part of JIS13B tensile test piece (10mm × 20
mm) from the weight increase (per unit area) before and after applying and removing the adhesive tape that was applied to the front and back surfaces and peeled after 15% tensile processing.
It was determined by subtracting the amount of scale peeling based only on the adhesive strength of the tape, that is, the weight increase (per unit area) before and after sticking and peeling of a 50 mm × 50 mm adhesive tape stuck and peeled on the sample surface.

These test / analysis / evaluation methods are also applied to the examples described later. These results are shown in Tables 1 and 2.

[0029]

[Table 1]

[0030]

[Table 2]

[0031]

[Table 3]

[0032]

[Table 4]

The thickness of the scale is approximately the same for all the test materials.
Although it was 0.7 μm, the C _Cr ratio changed in the range of 0.26 to 0.75. Table 1, as can be seen from Table 2, when the scale thickness is approximately the same regardless of whether the process is a hot-rolled or a heat treatment, descaling weight and corrosion resistance due to processing is dependent on the C _Cr ratio, C _Cr ratio When 0.40 or more, the scale adhesion is improved and the corrosion resistance of the bent portion is also improved.

This is because when the C _Cr ratio is 0.40 or more at a scale thickness of 1.0 μm or less, the adhesion between the scale and the base metal reaches a level at which the scale does not exfoliate even when it is worked. This is presumed to be due to the suppression of adverse effects on steel, that is, the formation of an environment in which crevice corrosion is likely to occur, and the exposure of the base alloy in a state where the passive film is insufficiently developed and easily rusts.

That is, an austenitic stainless hot-rolled steel sheet excellent in both corrosion resistance and scale adhesion is C _Cr
It is necessary to satisfy the ratio ≧ 0.40. (3) Finishing roll roll is kept in an atmosphere with oxygen concentration of 1.0 vol% or less: As described above, in order to suppress scale generation and growth during hot rolling, a large amount of strain introduced by rolling is required. It is effective to place the remaining steel strip immediately after rolling in a non-oxidizing environment. In particular, in order to suppress the scale formation and growth of the austenitic stainless steel during hot rolling to a thickness of 1.0 μm or less and to control the C _Cr ratio to 0.40 or more, the oxygen concentration of the finishing roll is set to 1.0 vol%. Since it is necessary to maintain the following atmosphere, it is defined as described above. Since it is obvious that the oxygen concentration is desirably as low as possible, no particular lower limit is set in the present invention.

As described in the above-mentioned research experiment, the control of the atmosphere in the roll roll extruding portion can be easily performed by local gas purging, so that it is not necessary to provide a long box as in the prior art. As the gas for purging, a non-oxidizing gas such as Ar gas or other inert gas may be used in addition to the N ₂ gas used in the above research and experiment. It is best to control the atmosphere of the extruding portion on the rolling rolls of all the stands of the finishing mill, but it may be omitted for some stands depending on the product. (4) Winding temperature 900 ° C or lower: coil winding temperature after rolling is 9
If the temperature exceeds 00 ° C, even if the scale formation and growth during hot rolling is controlled by controlling the atmosphere in the extruded portion, scale grows during coil cooling and exceeds 1.0 μm in thickness, so the winding temperature is Specify below 900 ° C. The scale thickness 0.5
The winding temperature is desirably set to 800 ° C. or lower in order to control the thickness to less than μm to form a temper color and further improve the surface gloss. Further, the lower limit of the winding temperature is not particularly limited from the viewpoint of scale thickness control, and may be at least the lower limit (approximately 300 ° C.) normally set from the viewpoint of preventing a defective winding shape.

[0037]

EXAMPLE A SUS304 slab having a thickness of 200 mm was heated to 1200 ° C., then roughly rolled into a sheet bar having a thickness of 30 mm by a rough rolling mill, and sent to a finishing rolling facility shown in FIG.
In after descaling, the finishing mill 8 7 stand N ₂ gas nozzle 5 is arranged in the chew out unit oxygen concentration control in each stand outlet side, rolling start temperature 1000 ° C., the rolling end temperature 960 ° C., N ₂ The thickness of the finished plate is varied by adjusting the gas ejection amount to variously change the oxygen concentration at the biting portion as shown in Table 5.
Finish rolling was performed to 1.5 mm, followed by water spray cooling by changing the amount of water with a cooling device (cooling water spraying device) 3 to wind up with a coiler 9 while changing the winding temperature (CT) variously as shown in Table 5. . Note that reference numeral 11 in the drawing denotes a rolling pass line.

Test specimens were taken from the hot-rolled coil (hot-rolled sheet) thus obtained, and the scale thickness, C _Cr ratio, corrosion resistance, and scale adhesion during processing were examined. The test / analysis / evaluation method is as described in the experimental example. In addition, in order to check the corrosion resistance in the state without a scale, the hot-rolled sheet under the condition 2 in Table 5 was pickled and tested.

Table 5 shows the results.

[0040]

[Table 5]

Condition 1 is a conventional example in which the atmosphere control of the extruded portion is not performed, and the scale thickness is the largest at 8.2 μm.
The C _Cr ratio is the smallest at 0.22, and the corrosion resistance and scale adhesion are at the worst levels. Condition 2 is that the oxygen concentration is 3.2 vol%
And Comparative Example higher than the range of the present invention, the scale is thick
Since the thickness was reduced to only 2.2 μm and the C _Cr ratio did not reach the range of the present invention of 0.30, the corrosion resistance was grade 3 as in the conventional example.
Although the scale adhesion is better than the conventional example, it is an insufficient level. Condition 5, the oxygen concentration is higher comparative example than the present invention range but the ℃ coiling temperature 940 in 0.9Vol% and the range of the present invention, C _Cr ratio is the present invention there is scale thickness range of the present invention Since it exceeded the range, the corrosion resistance stopped at a level up to grade 2 at most, and the scale adhesion was not so bad as in condition 2, but did not reach a level without any problem.

The oxygen concentration,
The hot rolled sheets under the conditions 3, 4 and the conditions 6 to 9, which are examples of the present invention in which both the winding temperature is controlled within the range of the present invention, have a scale thickness, C
_Since both _Cr ratios satisfy the requirements of the present invention, the corrosion resistance reaches grade 1 and scale peeling hardly occurs due to processing. As described above, according to the present invention, an austenitic stainless hot-rolled steel sheet having particularly excellent corrosion resistance in a processed portion and excellent scale adhesion during processing can be obtained.

[0043]

According to the present invention, the austenitic stainless steel has a significantly smaller scale thickness between black scale materials compared to the prior art, and therefore has much better corrosion resistance (particularly in the processed portion) and scale adhesion. Rolled steel sheets can be manufactured without significant capital investment and without impairing productivity, which limits the use of conventional steel sheets due to problems with surface properties and corrosion resistance even if they are cost-effective. In addition to being able to provide inexpensive blackscale materials to various fields of use, which had to yield to pickled and cold-rolled sheets, and when using them as cold-rolled materials, Owing to the thinness of the scale, it is inevitable to omit the pickling step or to significantly reduce the pickling load, and a reduction in manufacturing cost can be expected.

[Brief description of the drawings]

1 (a) is a schematic side view of a test rolling mill, and FIG. 1 (b) is a partial schematic plan view of FIG. 1 (a) with an upper rolling roll removed.

FIG. 2 is a graph showing the relationship between the oxygen concentration at the biting portion and the scale thickness.

FIG. 3 is a graph showing a relationship between a soaking temperature after cooling and a scale thickness.

FIG. 4 is a schematic diagram of a finish rolling facility used in an example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heating furnace 2 Rolling roll 3 Cooling device (cooling water spraying device) 4 Soaking furnace 5 Gas nozzle 6 Oxygen meter 6A Oxygen sensor 7 Descaling device 8 Finishing rolling mill 9 Coiler 10 Test material (hot rolled sheet) 10A Biting wire 10B Starting line 11 Rolling pass line

Continued on the front page (51) Int.Cl. ⁶ Identification code FI C21D 6/00 102 C21D 6/00 102B C23F 15/00 C23F 15/00

Claims (3)

[Claims] 1. A scale thickness of the surface is 1.0 μm or less,
An austenitic stainless steel hot-rolled steel having excellent corrosion resistance and scale adhesion, wherein the C _Cr ratio defined below is 0.4 or more, where the concentrations of Fe and Cr in the scale are C _Fe and C _Cr , respectively. steel sheet. Note: C _Cr ratio = C _Cr / (C _Fe + C _Cr ) 2. A hot rolling of the slab, descaling, finishing rolling, and winding into a coil shape, the finishing roll roll extruded portion is kept in an atmosphere having an oxygen concentration of 1.0 vol% or less, A method for manufacturing a hot-rolled austenitic stainless steel sheet having excellent corrosion resistance and scale adhesion, characterized by winding at 900 ° C or lower. 3. The slab is hot-rolled roughly, descaled, finish-rolled and wound into a coil. At the end of the roll, the rolled-out portion of the finish-roll is subjected to local gas purging and an atmosphere having an oxygen concentration of 1.0 vol% or less. A method for producing a hot-rolled austenitic stainless steel sheet having excellent corrosion resistance and scale adhesion, wherein the sheet is wound at 900 ° C or lower.