JP2002282902A - Method for tempering and rolling stainless steel sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for tempering and rolling a stainless steel sheet wherein equivalent surface properties equal to that of a ground coil sheet can be obtained without coil grinding. SOLUTION: This newly invented method for tempering and rolling a stainless steel sheet gives roll roughness in which the content RaL of surface roughness Ra in the roll circumference direction is 0.3 to 0.4 μm and the content RaC of surface roughness Ra in the roll axis direction is 0.3 to 1.0 μm and 1.1 or more times RaL, by making any one of a grinding pad, grindstone and grinding roll 9 contact the surface of the work roll 1a of a tempering and rolling mill 1 in operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for temper rolling a stainless steel sheet.

[0002]

2. Description of the Related Art Generally, a polished stainless steel plate is manufactured by the following steps. Hot rolling → hot rolled sheet annealing pickling → cold rolling → cold rolled sheet annealing pickling → temper rolling → coil polishing (using coil polisher equipment) In the temper rolling process, temper rolling equipment as shown in Fig. 4 The stainless steel sheet after the cold-rolled sheet annealing and pickling is lightly rolled using the method described above to roughly adjust the surface properties to a predetermined level. here,
The stainless steel sheet (coil) S is paid out by the pay-off reel 2, and then the upper and lower work rolls 1 of the temper rolling mill 1.
The rolls are rolled at a small reduction rate of about 2% or less at a and 1b, and then wound up by the tension reel 3.

In the coil polishing step, the temper-rolled steel sheet is mechanically polished using a coil polisher as shown in FIG. 5 to adjust the surface properties to a predetermined grade. As the surface finishing grade, for example, # 320 (made of No. 320 abrasive), HL (hairline) and the like are available. Here, the stainless steel plate (coil) S is paid out by the payoff reel 4, the surface flaw is removed by the flaw removal polishing belt 6a of the flaw removal polishing stand group 6, and then the HL polishing belt 7a of the HL polishing stand group 7 is removed. HL finish polishing. These polishing operations are performed under the application of a grinding oil to maintain the polishing performance of the polishing belt. However, since the stainless steel sheet has corrosion resistance, surface oiling is not necessary, and since the grinding oil adheres to the surface, it becomes a hindrance. Therefore, after the HL finish polishing, the degreasing / cleaning process using the degreasing / cleaning equipment 8 The oil on the surface is removed by the
Is wound up. In the degreasing / cleaning process, generally, an alkaline cleaning agent having a strong detergency is used.

[0004]

In the above prior art,
After the temper rolling step, the coil is polished with a dedicated coil polisher, which has a problem that the production cost is high. In addition, since degreasing and cleaning are performed after polishing, there is a problem in that equipment costs and maintenance costs are required. In addition, degreasing
The alkaline cleaning agent used for cleaning is COD (Chemic
al Oxygen Demand (chemical oxygen demand)
There is a problem that a corresponding water treatment facility is required and the cost is further increased.

An object of the present invention is to solve the above problems of the prior art and to provide a temper rolling method for a stainless steel sheet which can obtain the same surface properties without coil polishing.

[0006]

Means for Solving the Problems The present inventor has conducted intensive studies and experiments in order to solve the above-mentioned problems. It was found that by performing rolling, the same surface properties as those obtained by performing coil polishing after temper rolling were obtained.

[0007] For example, H specified in JIS G 4305 of SUS304 by normal temper rolling → coil polishing.
In the L-finished product, the surface roughness Ra in the L direction (the passing direction or the rolling direction) and the C direction (the direction perpendicular to the passing direction or the rolling direction and the thickness direction) depends on the polishing count of the HL polishing belt used for finish polishing. The values vary within the range L and the range C as shown in FIG. 3, respectively. On the other hand, the temper rolling is performed on the surface of the work roll of the temper rolling mill online while applying a polishing grain with a grindstone of various polishing numbers. S obtained by going
In US304, as shown in FIG. 3, the surface roughness Ra in the L direction and the C direction is such that the surface roughness is within the range L and the range C when polished by the HL polishing belt of the same polishing number, respectively. That is, a product equivalent to the HL finish by coil polishing was obtained.

[0008] The present invention has been made based on such knowledge, and the gist thereof is as follows. (1) In the temper rolling process of a stainless steel sheet, the roll surface component RaL of the surface roughness Ra is 0.3 to 0.4 μm and the roll axial component
A temper rolling method for a stainless steel sheet, wherein a roll roughness is provided so that RaC is 0.3 to 1.0 μm and 1.1 times or more of RaL.

(2) a polishing pad on the surface of the work roll;
The method for temper rolling a stainless steel sheet according to (1), wherein the roll roughness is imparted by bringing any one of a grindstone and a polishing roll into contact. Here, the surface roughness Ra is JIS
B 0601 means the arithmetic average roughness Ra.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the present invention, in the temper rolling step of a stainless steel plate, the roll circumferential component RaL of the surface roughness Ra is 0.3 to 0.4 on the surface of a work roll of a running temper rolling mill. μm, Roll axis component RaC is 0.
Since a roll roughness of 3 to 1.0 μm and 1.1 times or more of RaL is applied, a surface pattern generally called a polished finish, particularly an HL finish, is formed on the steel sheet surface after the temper rolling is completed. Can now be obtained.

When RaL is less than 0.3 μm, the surface roughness in the steel sheet L direction is too small, while when RaL is more than 0.4 μm, the surface roughness in the steel sheet L direction is too large.
Since surface quality equivalent to the finish cannot be obtained, RaL is 0.3 to 0.
Limited to 4 μm. Incidentally, preferably 0.32 ~ 0.37μm
It is. If RaC is less than 0.3 μm, the surface roughness in the direction of the steel sheet C is too small, while if RaC is more than 1.0 μm, the surface roughness in the direction of the steel sheet L is too large.
Since the surface quality equivalent to L finish cannot be obtained, RaC is 0.3 to
Limited to 1.0 μm. Incidentally, preferably 0.5 to 0.8 μ
m.

When the RaC is less than 1.1 times the RaL, the steel sheet L
Since a superfine line pattern continuous in the direction cannot be obtained and a surface quality equivalent to the HL finish cannot be obtained, RaC is limited to 1.1 times or more of RaL. In addition, it is preferably 2-3 times. As a means for providing a predetermined roll roughness to a work roll of a running temper rolling mill online, a polishing pad or a grindstone (preferably an elastic grindstone) having an appropriate polishing number or a polishing roll having the grindstone as a surface layer is used. And the like can be preferably used in contact with the surface of the rotating work roll. It is preferable to apply the roll roughness online during the movement so that the polishing marks applied to the work rolls during the rolling do not disappear.

FIGS. 1 and 2 show an example of an online work roll polishing apparatus suitable for carrying out such a method. FIG. As shown in FIG. 2, the polishing roll 9 is driven to rotate by a drive motor 11, and is pressed against the surface of the work roll 1a by pressing means 12 such as an air cylinder. The pressing means 12 is fixed to a movable carriage 13, and the movable carriage 13 is driven by a movement motor 14 to move in the direction C (= work roll axis direction). According to this apparatus, by moving the polishing roll in the axial direction of the work roll while rotating, the polishing can be performed over the entire length of the work roll, and the polishing number of the polishing roll and the moving speed in the C direction are appropriately set. By doing so, it is possible to impart a roll roughness within the range of the present invention to the work roll.

This apparatus is a dust collector 10 for sucking foreign substances such as polishing debris in order to prevent foreign substances such as polishing debris generated by polishing from dropping onto the steel plate and impairing the surface quality.
(FIG. 1).

[0015]

[Example] SUS304 (plate thickness 1.0 mm) or SUS4
In performing temper rolling at a rolling reduction of 0.5% on a 30 (1.0 mm thick) stainless steel plate, rolling was performed while polishing the work rolls using the online work roll polishing apparatus shown in FIGS. Work roll diameter is 800 mm, rolling speed is
It was 150 mpm. At this time, the roll roughness (work roll surface roughness) was adjusted as shown in Table 1 by changing the polishing count and feed speed (movement speed in the C direction) of the grinding roll. As a result, in the example of the present invention in which the roll roughness was adjusted within the range of the present invention, as shown in Table 1, the steel plate after the temper rolling had the same surface roughness as the HL finish by coil polishing.

[0016]

[Table 1]

[0017]

According to the present invention, since a stainless steel plate having a surface quality equivalent to that of the HL finish can be manufactured in the temper rolling step, the coil polishing step can be omitted.
In addition, there is an excellent effect that a degreasing / cleaning facility required for the coil polishing step is not required.

[Brief description of the drawings]

FIG. 1 is a schematic view showing one example of an online work roll polishing apparatus suitable for carrying out the present invention.

FIG. 2 is a schematic view showing an example of a driving mechanism of a polishing roll.

FIG. 3 is an explanatory view showing that surface conditioning equivalent to a coil polished product can be obtained by temper rolling with online work roll polishing.

FIG. 4 is a schematic view showing a conventional temper rolling method.

FIG. 5 is a schematic view showing an example of a coil polisher facility.

[Explanation of symbols]

 S Steel plate (coil) 1 Temper rolling mill 1a Upper work roll 1b Lower work roll 2 Payoff reel 3 Tension reel 4 Payoff reel 5 Tension reel 6 Scratching polishing stand group 6a Scratching polishing belt group 7 HL polishing stand group 7a HL polishing belt 8 Degreasing / washing equipment 9 Polishing roll 10 Dust collector 11 Drive motor 12 Pressing means 13 Moving carriage 14 Moving motor

Claims (2)

[Claims] In the temper rolling process of a stainless steel sheet, a roll surface component RaL of surface roughness Ra of 0.3 to 0.4 μm and a roll axial component RaC of 0.3 are applied to the surface of a work roll of a running temper rolling mill. A temper rolling method for a stainless steel sheet, characterized by providing a roll roughness of 1.0 μm or more and 1.1 times or more of RaL. 2. The temper rolling method for a stainless steel sheet according to claim 1, wherein any one of a polishing pad, a grindstone, and a polishing roll is brought into contact with the surface of the work roll to impart the roll roughness.