JPH0760897A - Lubricating black steel panel - Google Patents

Abstract

PURPOSE:To improve molding processability and film peel resistance and to keep beautiful appearance by forming a resin film layer obtained under specific conditions on the surface of a steel panel or forming this resin film layer on the surface of a steel panel having a black film or the surface of a chromium treated steel panel. CONSTITUTION:A resin film layer with a thickness of 0.3-5.0mum composed of a resin with a glass transition timp. (Tg) of 40.0 deg.C or higher and containing silica with a particle size of 1-100nm in amt. of 5-50% by wt. of the resin is formed on the surface of a steel panel. Further, a solid lubricant with an m.p. of 100 deg.C or higher characterized by that particles whose particle size is 50-110% of the thickness of the resin film layer are contained in an amt. of 3-50wt.% and the remainder is composed of particles with a particle size corresponding to 5-50% of the thickness of the resin film layer is added to the whole of the resin film in an amt. of 3-40wt.%. A black film is formed on the surface of the steel panel and a chromate film is provided thereon and the resin film layer is further formed on the chromate film.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION This invention relates to home appliances, automobiles,
The present invention relates to a lubricative steel sheet which is excellent in formability, corrosion resistance and film peeling resistance used for building materials and the like, and a lubricity black steel sheet which also has a beautiful appearance.

[0002]

2. Description of the Related Art Various surface-treated steel sheets are used in industrial fields such as automobiles, home electric appliances, and building material products. Most of these are mainly intended to impart excellent corrosion resistance to steel sheets, but in addition to them, surface-treated steel sheets excellent in formability and weldability have also been developed.

One of them is a surface-treated steel sheet (lubricating steel sheet) that can be press-formed without using lubricating oil at the time of forming. For example, Japanese Patent Laid-Open No. 3-16726 discloses a zinc or aluminum alloy. It has a chromate film on a plated steel sheet, and has a resin film containing 10 to 80 parts by weight of silica and 100 parts by weight of a polyolefin wax having an average particle size of 1 to 7 μm with 20 parts by weight or less based on 100 parts by weight of the resin. Lubricating steel sheets with excellent formability have a melting point of JP-A-4-94771.
Disclosed is a lubricative steel sheet having a resin coating containing a solid lubricant having a particle diameter of 3 to 100 μm and a weight ratio of 0.02 to 0.4 with respect to Resin 1 at 120 ° C. and having excellent weldability and corrosion resistance. Further, Japanese Patent Application Laid-Open No. 4-271872 proposes a lubricating steel sheet in which a fluorine-based solid lubricant having a thickness of 0.01 to 2 μm is fixed to a resin with ethylene glycol mononormal hexyl ether.

In these lubricative steel sheets, wax (lubricant) is present on the surface of the resin film in a protruding state, and this lubricant ensures the lubricity during press forming. Since the lubricant is projected on the surface of the resin film, the lubricant adheres to and contaminates the rolls such as the manufacturing line of the lubricating steel plate and the leveler and slit line after the manufacturing. In addition, when the lubricative steel sheet is formed, the lubricant may be peeled off and deposited in the mold, which hinders the formability. Generally, the larger the particle size of the granular wax added to the resin, the better the mold galling resistance of the lubricating steel sheet, but the moldability tends to deteriorate.

On the other hand, a black steel plate having a blackened surface, which is used as it is without coating, has recently been developed and is used particularly in the fields of home electric appliances and office equipment.

For example, the applicant of the present invention has disclosed in Japanese Patent Publication No. Sho 62-30262 and Japanese Patent Publication No. 62-30263 that nitric acid or nitric acid is the main component in a nickel plating layer, an alloyed nickel plating layer or an alloyed cobalt plating layer. A blackened steel sheet having a layer that has been blackened by a mixed acid, etc., or an alkaline aqueous solution (including one that further has an oil coating layer, a chemical conversion coating or an organic coating on the blackened layer) ) And its manufacturing method. Further, JP-A-4-218678 discloses a black steel sheet having a chromate film on a zinc-plated or zinc-based alloy-plated surface and an organic film on which a black dye and a solid lubricant are added. ing.

However, in the case of the former blackened steel sheet, when press forming, galling may occur on the surface of the steel sheet even if oil is applied, and the appearance may be impaired, and the surface of the steel sheet may be damaged during handling. It may be easily damaged and the product value may be impaired. Further, in the latter black steel sheet using the black dye, since the uppermost organic film is colored, the damage of the film during the forming process appears as the deterioration of the appearance after the direct processing.

In the lubricating steel sheet disclosed in the above-mentioned JP-A-3-16726 or JP-A-4-94771, a steel sheet having a black coating is used as a base steel sheet and a resin coating containing a solid lubricant is formed thereon. It is also conceivable to form it into a lubricious black steel plate. However, in this case, the solid lubricant is protruding on the surface of the resin film, the blackness of the steel sheet is lowered, the glossiness is also low, and the protruding solid lubricant is scraped off during handling, so the color tone of that part is reduced. Has a drawback such as a change in the value, and there is a problem in handleability.

[0009]

DISCLOSURE OF THE INVENTION The present invention prevents the adhesion of a lubricant to rolls and the obstruction of forming workability, which occur during the production of a conventional lubricous steel sheet, and the lubricating oil (press A steel sheet that has the same or higher performance than conventional lubricative steel sheets, especially the resin coating layer and this resin coating, where the resin coating will not be damaged and the appearance will not deteriorate even if molding is performed without using (oil) Of the solid lubricant contained in (1) has excellent peeling resistance (hereinafter, these are not distinguished and is referred to as “film peeling resistance”), and high lubricity equivalent to conventional lubricating steel sheets. An object of the present invention is to provide a lubricous black steel sheet having an excellent appearance comparable to that of conventional black steel sheets and having excellent workability.

[0010]

Means for Solving the Problems As a result of repeated studies on the particle size of the solid lubricant contained in the resin coating layer of the lubricity steel sheet, the present inventors have found that the coating layer has a thickness of 50% or more and 110% or more. A solid lubricant having a particle diameter corresponding to the following (hereinafter referred to as a solid lubricant of a large particle diameter group), and a solid lubricant having a particle diameter corresponding to 5% or more and less than 50% of the thickness of the coating layer (Hereinafter, referred to as a solid lubricant of a small particle size group), if the ratio of the solid lubricant of the large particle size group is 3 to 50% by weight of the whole solid lubricant, the resin film layer is good. It was found that the lubricating property is maintained and the film peeling resistance is excellent.

Further, the same study was conducted on a steel sheet having a black coating on the surface, and the gloss and color tone of the lubricating black steel sheet were controlled by controlling the amount of solid lubricant protruding on the surface of the resin coating. If the particle size of the solid lubricant contained in the resin film layer is specified in the same manner as in the case of the above-mentioned lubricative steel sheet, the resin film layer has good lubricity and is excellent in gloss and color tone. I found out that.

The gist of the present invention resides in the following lubrication steel sheets and lubrication black steel sheets:

A resin coating layer is formed on the surface of the steel sheet, and the resin coating layer has a thickness of 0.3 to 5.0 μm, a resin glass transition temperature (Tg) of 40 ° C. or higher, and a silica having a particle diameter of 1 to 100 nm. Is contained in the resin in an amount of 5 to 50% by weight, and further contains the following solid lubricant in an amount of 3 to 40% by weight based on the entire resin film layer.

Solid lubricant: 3 to 50% by weight of the solid lubricant having a melting point of 100 ° C. or more and a particle diameter corresponding to 50% or more and 110% or less of the thickness of the resin coating layer, the remainder being the resin coating. A solid lubricant having a particle size corresponding to 5% to less than 50% of the layer thickness.

A lubricating steel sheet having excellent film peeling resistance, which has a plating film on the surface of the steel plate and further has the resin film layer described above on the plating film.

A lubricating steel sheet having excellent film peeling resistance, which has a plating film on the surface of the steel plate, a chromate film on it, and the resin film layer described above on it.

A lubricity black steel sheet having excellent workability, which has a black coating on the surface of the steel sheet and further has the resin coating layer described above on the black coating.

A lubricity black steel sheet having excellent workability, comprising a black coating on the surface of the steel sheet, a chromate coating on the black coating, and the resin coating layer described above on the chromate coating.

[0019]

The lubricating steel sheet and the lubricating black steel sheet of the present invention will be described in detail below.

In the lubricating steel sheet of the present invention (the above-mentioned invention), the base material steel sheet is SPCC or SPH defined in JIS.
Various steel plates such as cold rolled steel plate represented by C and SUS 304-CP, hot rolled steel plate, cold rolled stainless steel plate and the like can be used according to the application.

The resin constituting the resin coating layer must have a glass transition temperature (Tg) of 40 ° C. or higher. Tg
Is less than 40 ° C., when the steel sheet and the die slide during the forming process (hereinafter simply referred to as “formation”), the strength as a film is insufficient and the mold galling resistance deteriorates.

This resin has a carboxyl group, a hydroxyl group, a sulfonic acid group, in order to secure the adhesiveness with the base material steel plate and the adhesiveness with the coating film when the resin coating layer is further coated. It is desirable to have a polar functional group such as a nitro group. Examples of such resins include acrylic resins, urethane resins, epoxy resins, vinyl acetate resins and the like.

The amount of resin film deposited is 0.3 to 5.0 g per side
/ m ² If it is less than 0.3 g / m ² , the corrosion resistance of this lubricative steel sheet is remarkably low, and it is difficult to secure a film thickness that can prevent contact between the die and the surface of the base steel sheet during processing. On the other hand, if it exceeds 5.0 g / m ² , the lubrication performance of the resin film layer is saturated, and the film is easily peeled off, and the resin peeled off during processing is deposited in the mold and hinders workability.

As the solid lubricant contained in the resin film layer, one having a melting point of 100 ° C. or higher is required, and a fluorine wax such as polyethylene (PE) wax or polytetrafluoroethylene (PTFE) is suitable. is there. This is because the temperature of the material during processing may rise up to about 100 ° C. in actual press molding work, and even under such circumstances, the resin film layer can exhibit sufficient lubricity.

The solid lubricant satisfies the predetermined condition as described above, that is, 50% or more of the thickness of the resin film layer 1
The solid lubricant of the large particle size group having a particle size corresponding to 10% or less accounts for 3 to 50% by weight of the whole solid lubricant, and the balance corresponds to 5% or more and less than 50% of the thickness of the resin coating layer. It is necessary to have a particle size composition that is a small particle size group of solid lubricants having particle sizes.

The upper limit of the particle size of the solid lubricant of the large particle size group is set to 110% of the thickness of the resin film layer, because the amount of the solid lubricant protruding on the film surface increases when it exceeds 110%.
This is because peeling of the coating layer is likely to occur. Further, the lower limit of the particle size of the solid lubricant in the small particle size group is set to 5% of the thickness of the resin film layer in order to prevent deterioration of the lubricity of the resin film layer particularly during deep drawing. . That is,
When the degree of processing is large, such as deep-drawing press working, there is considerable sliding between the die and the resin film layer, which damages the surface of the resin film layer and the solid lubricant in the large particle size group near this surface. As a result, the lubrication effect of the solid lubricant of the large particle size group is hindered, but the solid lubricant of the small particle size group in the resin film is exposed, and deterioration of the lubricity of the resin film layer is suppressed. At this time, if the particle size of the solid lubricant in the small particle size group is less than 5% of the thickness of the resin film, the amount of the lubricant is too small to withstand strong deep drawing.

The content of the solid lubricant in the large particle size group is 50
When the content exceeds the weight%, the presence of this solid lubricant impairs the continuity (integrality) of the resin film layer, and the solid lubricant is easily peeled off or the resin film is easily peeled off. on the other hand,
When the content of the solid lubricant in the large particle size group is small and less than 3%, the lubricity of the resin film is not sufficient, the surface of the resin film layer is easily damaged during processing, and the appearance after processing deteriorates. Remarkable.

When the ratio of the solid lubricant of the large particle size group is within the above range, the solid lubricant is in a state of hardly protruding on the surface of the resin film layer, and even if it is a light processing such as bending. For example, the resin coating layer is hardly damaged, and the solid lubricant of this large particle size group provides sufficient lubricity. On the other hand, when the degree of processing is large, such as deep-drawing press working, fairly strong sliding occurs between the die and the resin film layer, and the solid lubricant of the large particle size group on the surface of the resin film layer and in the vicinity of this surface Is easily damaged, and the lubrication effect of the solid lubricant of the large particle size group is hindered, but the solid lubricant of the small particle size group in the resin film is exposed, and deterioration of lubricity is suppressed. As a result, it is possible to prevent contamination of rolls and the like of the production line, leveler and slit line, obstruction of workability due to deposition of the peeled solid lubricant in the mold, and deterioration of appearance after processing. Further, even when the cut plates of the steel plates are stacked and piled up, the solid lubricants protruding from the surface of the resin film layer do not come into contact with each other and slip, and the steel plates do not collapse.

The content of the solid lubricant in the resin film layer is 3 to
40% by weight. If it is less than 3% by weight, the absolute amount of the solid lubricant in the vicinity of the surface of the resin film layer is small, the lubricity is insufficient, and the appearance after processing is significantly deteriorated. On the other hand, if the content is
When it exceeds 40% by weight, the lubricating effect is saturated, the film-forming property of the resin is impaired, and the corrosion resistance and film strength of the resin film decrease.

Suitable silica contained in the resin coating layer is water-dispersible colloidal silica, organosilica sol dispersed in an organic solvent, or powder type dry silica. Further, the particle size is required to be 1 to 100 nm in order to uniformly disperse it in the resin film.

The content of silica is 5 to 50% by weight based on the resin (dry state). If it is less than 5% by weight, the corrosion resistance, film strength and coating adhesion of the resin film are significantly deteriorated. On the other hand, if the content exceeds 50% by weight, the resin film layer becomes extremely brittle and cracks are likely to be formed on the surface of the film during processing. When silica is added, in order to improve the adhesion between silica and resin, γ-aminopropyltriethoxysilane, vinyltriethoxysilane, γ
-It is desirable to add a silane coupling agent such as glycidoxypropyltrimethoxysilane.

The steel sheet of the invention of 1 is a lubricating steel sheet having the above-mentioned resin film layer on a plated steel sheet.

The plated steel sheet used in this case means zinc (Zn) plating, zinc-iron (Fe) alloy plating,
A steel sheet plated with a zinc-based alloy such as a zinc-nickel (Ni) alloy plating or a zinc-aluminum (Al) alloy plating, or a steel sheet plated by any method such as hot dipping or electroplating . Therefore, the steel sheet used as the base material is a steel sheet that requires anticorrosion treatment by plating, and is, for example, a cold rolled steel sheet or a hot rolled steel sheet represented by JIS such as SPCC and SPHC.

The steel sheet of the invention of 1 is a lubricity steel sheet having a chromate film on a plated steel plate and further having the resin film layer described above thereon.

The amount of the chromate film deposited is metallic chromium (C
It is preferably 10 to 200 mg / m ² in terms of r). 10 mg
If it is less than / m ² , the corrosion resistance is not sufficient, and if it exceeds 200 mg / m ² , the adhesion to the upper resin film layer is hindered. The chromate film may be any of reactive chromate, coating chromate or electrolytic chromate, and silica may be added.

The steel sheet according to the invention is a lubricating black steel sheet having the above-mentioned resin film layer on the steel plate having a black film.

The steel sheet having a black film used in this case is, for example, a method in which zinc (Zn) -cobalt (Co) alloy plating is performed and then anodizing in an ammonium sulfate [(NH ₄ ) ₂ SO ₄ ] aqueous solution. , Zinc-nickel (Ni) alloy plating followed by etching with nitric acid (HNO ₃ ), special plating methods such as black nickel plating, black chrome plating, and methods of applying resin coating containing black pigment, etc. It is a steel sheet having a black film formed by the method used. The steel sheet used as the base material is
Cold rolled steel sheet, hot rolled steel sheet, cold rolled stainless steel sheet (eg, JIS specified SPCC, SPHC, SUS 304-CP)
And so on.

The steel sheet of the invention of 1 is a lubricating black steel sheet having a black coating on a steel sheet, a chromate coating, and the above-mentioned resin coating layer thereon.

The amount of the chromate film adhered is converted into metallic chromium (Cr) as in the case of the above-mentioned lubricating steel sheet.
It is preferably 10 to ²⁰⁰ mg / m ² . If it is less than 10 mg / m ² , the corrosion resistance is not sufficient, and if it exceeds 200 mg / m ² , the adhesion with the upper resin film layer is impaired. The chromate film may be any of reactive chromate, coating chromate or electrolytic chromate, and silica may be added.

In order to produce the lubricating steel sheet of the present invention, the above-mentioned base material steel sheet, plated steel sheet, chromate-treated plated steel sheet, steel sheet having a black coating or steel sheet having a chromate-treated black coating is used. A resin containing silica and a solid lubricant satisfying the above-mentioned predetermined conditions may be applied thereon. As a coating method, a conventionally used method can be applied.

[0041]

Example 1 Each material shown in Table 1 (base steel plate)
On the surface (one side) of the glass transition temperature (Tg) shown in Table 2
A treatment liquid containing silica and a solid lubricant is applied to a polyacrylic resin (Ac), polyurethane resin (Ur) or epoxy resin (Ep) containing a bar coater at a material temperature of 95 ° C for 30 seconds. A baked and lubricated steel plate was produced. As the solid lubricant, polyethylene wax (PE) or fluorine wax (PTFE) was used.

Table 2 shows the thickness of the resin coating layer, the particle size and content of silica, and the melting point, particle size (average particle size) and content of the solid lubricant. The symbols D to H in Table 1
For various types of plated steel sheets in
Chromate treatment liquid containing O ₃ at 10 g / liter and reducing agent added so that Cr ³⁺ / Cr ⁶⁺ = ^1/1 is converted to metallic Cr by spin coating and the adhesion amount becomes 40 mg / m ² . Then, a chromate treatment of drying for 40 seconds under the condition of the maximum material temperature of 80 ° C. was performed in the oven. However, in some cases, the above resin is directly applied to the surface after plating without performing chromate treatment.

With respect to each of the above-mentioned lubricative steel sheets (Nos. 1 to 19 in Table 2), a test piece having a predetermined shape was cut out, and the workability, the appearance after processing and the peeling of the solid lubricant (including the peeling of the resin film) ) Was tested.

Regarding workability, a test for deformation processing was carried out under the following conditions using a deep drawing tester without applying lubricating oil to the test piece, and the limiting drawing ratio (LDR) was obtained. LDR
Is 2.2 or more, the workability is good.

[Press conditions] Wrinkle holding pressure: 1.5 tons Punch diameter: 40 mmφ Die diameter: 44.2 mmφ Molding speed: 200 mm / sec Regarding the appearance after processing and the peeling property of the solid lubricant, apply lubricating oil to the test piece as well. Without processing, after performing processing under the following conditions using a deep drawing tester, the appearance after processing is visually inspected for the degree of damage to the resin film layer, and for the peelability of the solid lubricant, 10 pieces are used. The degree of adhesion of the lubricant to the die (die) after processing was examined.

[Press conditions] Wrinkle holding pressure: 1.5 tons Punch diameter: 40 mmφ Die diameter: 44.2 mmφ Blank diameter: 90 mmφ Drawing rate: 200 mm / sec The test results are shown in Tables 3 to 10. Table 3 shows the SP specified in JIS as the material (base steel plate) for forming the resin film layer.
When a steel plate equivalent to CC (symbol A in Table 1) is used, Table 4 is a JIS SPHC equivalent material (also symbol B), and Table 5 is a JIS SUS 304-CP equivalent material (also symbol C). ) Is used, Table 6 uses a zinc electroplated steel sheet (also symbol D), Table 7 uses a zinc-nickel alloy electroplated steel sheet (also symbol E), and Table 8 shows hot dip galvanized steel sheet. When (also symbol F) is used, Table 9
Is a test result when an alloyed hot dip galvanized steel sheet (also symbol G) is used, and Table 10 is a test result when a hot dip zinc-aluminum alloy plated steel sheet (also symbol H) is used.

In these tables, ⊚ in the "Appearance after processing" column indicates ○ when no damage is observed in the resin film.
Indicates that the resin coating is slightly damaged, Δ indicates that the coating is slightly damaged, and × indicates that the coating is significantly damaged. Also,
In the column of "Peeling property of solid lubricant", ◎ indicates that no adhesion of lubricant was found on the die, ○ indicates that adhesion of lubricant was slightly found on the die, and △ indicates that adhesion of lubricant was slightly high. In this case, x is when a large amount of lubricant is attached.

As is clear from these results, even if any of the materials shown in Table 1 is used, in the lubricous steel sheets (Nos. 8 to 19) which are out of the conditions defined by the present invention, the appearance after processing and the resin film At least one of the peeling properties of No. 10 is poor, and in particular, the particle size of the solid lubricant of the large particle size group is too large, No. 10 and 11, and the mixing ratio of the solid lubricant of the large particle size group is too high. In Nos. 12 and 16, No. 14 in which the particle size of the solid lubricant in the small particle size group is too small, and No. 19 in which the solid lubricant content is too high, the amount of lubricant adhered to the die was Many have poor film peeling resistance.
On the other hand, in the lubricity steel plate (No. 1 to 7) of the present invention,
Good results were obtained regardless of which material was used.

[0049]

Example 2 Each material shown in Table 11 (base steel plate)
After the chromate treatment was applied to the surface (one surface) of the resin, polyacrylic resin (Ac), polyurethane resin (Ur) or epoxy resin (Ep) having a glass transition temperature (Tg) shown in Table 12 was treated with silica. Apply the treatment liquid containing the solid lubricant with a bar coater and adjust the material temperature to 95 ° C.
After baking for 2 seconds, a lubricity black steel plate was produced. As the solid lubricant, polyethylene wax (PE) or fluorine wax (PTFE) was used. Table 12 shows the thickness of the resin coating layer, the particle size and content of silica, and the melting point, particle size (average particle size) and content of the solid lubricant. The chromate treatment contains CrO ₃ at 10 g / liter, and Cr ³⁺
/ Cr ⁶⁺ = ^1/1 chromate treatment solution with reducing agent added is spin coated to convert to metal Cr and the amount deposited is 40
Apply to mg / m ² and apply maximum material temperature in oven
It was carried out by drying for 40 seconds under the condition of 80 ° C.

With respect to the above-mentioned lubricative steel sheets (Nos. 1 to 20 in Table 12), test pieces each having a predetermined shape were cut out, and the color tone, glossiness, workability, appearance after processing and peeling of solid lubricant (resin) (Including peeling of the coating) was tested.

Regarding the color tone, the lightness L value of the film was measured using a color tester (MS-3 manufactured by Suga Test Instruments Co., Ltd.), and regarding the glossiness, the 60-degree specular glossiness was measured with the same color tester. An L value of 12 or less and a 60 ° specular gloss of 22 or more were considered good.

Regarding workability, a limit drawing ratio (LDR) was obtained by conducting a test under the same method and conditions as in Example 1 except that the die diameter was 42.0 mmφ. If the LDR is 2.2 or more, the workability is good.

Regarding the appearance after processing and the releasability of the solid lubricant, after processing was carried out by the same method and conditions as in Example 1 except that the die diameter was 42.0 mmφ, the appearance after processing was the resin film layer. The degree of damage of the solid lubricant was visually inspected, and the peeling property of the solid lubricant was examined by measuring the degree of adhesion of the lubricant to the die (die) after processing 10 pieces.

The test results are shown in Tables 13 and 14. Table 13
Is a zinc-nickel alloy electroplated steel sheet subjected to blackening treatment as a material (base steel sheet) for forming a resin film layer, and Table 14 shows a zinc-cobalt alloy electroplated steel sheet subjected to blackening treatment. It is a test result in the case.

In these tables, ⊚ in the “Appearance after processing” column shows no change in blackness, ◯ indicates a slight decrease in blackness, Δ indicates slightly more film damage,
X indicates when the film damage is large. In addition, in the column of "Removability of solid lubricant", ◎ indicates that no adhesion of lubricant was found on the die, ○ indicates that some adhesion of lubricant was found on the die, and △ indicates that no adhesion of lubricant was found. When the amount is a little large, x is when the adhesion of the lubricant is large.

As is clear from these results, even if any of the materials shown in Table 11 is used, is the lubricity steel sheet (No. 8 to 20) out of the conditions specified in the present invention poor in workability (N
o.14, 17 and 20), inferior in color and gloss (No.10 and 11), and even if there is no problem in their characteristics,
At least one of the appearance after processing and the peeling property of the resin film was poor (No. 8, 9, 12, 13, 16, 18 and
19). In particular, No. 15 was inferior in all the above characteristics. On the other hand, the lubricity steel plate of the present invention (No. 1 to 7)
Then, good results were obtained regardless of which material was used.

[0057]

[Table 1]

[0058]

[Table 2]

[0059]

[Table 3]

[0060]

[Table 4]

[0061]

[Table 5]

[0062]

[Table 6]

[0063]

[Table 7]

[0064]

[Table 8]

[0065]

[Table 9]

[0066]

[Table 10]

[0067]

[Table 11]

[0068]

[Table 12]

[0069]

[Table 13]

[0070]

[Table 14]

[0071]

The lubricating steel sheet of the present invention can be processed without using a lubricating oil during press working, the appearance is not deteriorated after the working, and the solid lubricant added to the resin film layer is used. It is possible to remarkably reduce the contamination of the roll of the production line and the mold during the molding process. This steel sheet is particularly excellent in film peeling resistance (peeling resistance of the resin film layer and the solid lubricant contained in this resin film) and also has excellent corrosion resistance, so it is a material for automobiles, home appliances, building materials, etc. Is suitable as

The lubricating black steel sheet of the present invention has a beautiful appearance and excellent workability, and is particularly suitable as a material for home electric appliances and office equipment.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication C23C 26/00 A C25D 11/38 A

Claims (5)

[Claims] 1. A resin coating layer is provided on the surface of a steel sheet, the resin coating layer having a thickness of 0.3 to 5.0 μm, a resin glass transition temperature (Tg) of 40 ° C. or higher, and a particle diameter of 1 to 100 nm. 5 to 50% by weight of silica with respect to the resin, and 3 to 40% by weight of the following solid lubricant with respect to the entire resin film layer, which is excellent in film peeling resistance. steel sheet. Solid lubricant: Melting point of 100 ℃ or more,
3 to 50% by weight of the whole has a particle size corresponding to 50% or more and 110% or less, and the balance is 5% of the thickness of the resin coating layer.
A solid lubricant having a particle size corresponding to 50% or more and less than 50%. 2. A lubricative steel sheet having excellent film peeling resistance, which has a plating film on the surface of the steel plate and further has the resin film layer according to claim 1 thereon. 3. A steel sheet having a plating film, a chromate film on the plating film, and a resin film layer according to claim 1 on the plating film, which is excellent in film peeling resistance. Lubricating steel plate. 4. A lubricity black steel sheet having excellent workability, comprising a black coating on the surface of the steel sheet, and further having the resin coating layer according to claim 1 thereon. 5. A lubricity excellent in workability characterized by having a black coating on the surface of a steel sheet, a chromate coating on the black coating, and a resin coating layer according to claim 1 on the black coating. Black steel plate.