CN109072447B - Surface-treated steel strip and method for producing surface-treated steel strip - Google Patents

Surface-treated steel strip and method for producing surface-treated steel strip Download PDF

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Publication number
CN109072447B
CN109072447B CN201780023567.2A CN201780023567A CN109072447B CN 109072447 B CN109072447 B CN 109072447B CN 201780023567 A CN201780023567 A CN 201780023567A CN 109072447 B CN109072447 B CN 109072447B
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China
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coating layer
zinc phosphate
steel strip
lubricating
treated steel
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CN201780023567.2A
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CN109072447A (en
Inventor
安井淳
佐藤一宏
西谷宗刚
川西義博
嶋谷佳祐
勅使河原智哉
藤脇健史
田口宽树
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Japan Pakase Seiki Co ltd
Nippon Steel Corp
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Japan Pakase Seiki Co ltd
Nippon Steel and Sumitomo Metal Corp
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    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
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    • C23C22/07—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
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Abstract

The surface-treated steel strip of the present invention comprises: a base steel plate; a zinc phosphate coating layer formed in an island shape on the surface of the base steel sheet and formed of needle-like zinc phosphate crystals; and a lubricating coating layer which covers the surface of the base steel sheet and a part of the zinc phosphate coating layer and contains at least a lubricating component, wherein the area ratio of the zinc phosphate crystals exposed on the surface of the lubricating coating layer is 25% to 90%.

Description

Surface-treated steel strip and method for producing surface-treated steel strip
Technical Field
The present invention relates to a surface-treated steel strip and a method for producing a surface-treated steel strip.
Background
In plastic working of steel sheets, in the working of automobile transmission parts and the like which require multi-step press molding under high surface pressure, in order to prevent seizure or sticking of the steel sheets to a die, the following phosphate soap treatment was performed: phosphate crystals mainly composed of zinc phosphate are deposited on the surface of the steel sheet to form a phosphate coating, and then a reactive soap coating mainly composed of sodium stearate (alkali soap) is applied as an upper layer of the phosphate coating. However, in the phosphate soap treatment, a long chemical reaction time is required for the formation of the phosphate coating and the reactive soap coating, and therefore, the production cost may become high. In addition, the unreacted soap component adheres to the mold as pressurized dross during the pressure molding, and therefore frequent cleaning of the mold becomes important.
Therefore, in order to prevent seizure or sticking in multi-step plastic working such as multi-step press molding under high surface pressure without carrying out a reactive soap treatment which requires a long time, a technique of forming a lubricating film containing a lubricating component as an upper layer of a phosphate film has been disclosed (for example, see patent document 1 below)
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2013-104125
Disclosure of Invention
Problems to be solved by the invention
Here, the treatment disclosed in patent document 1 is often practically performed in a state of a steel strip. When the object to be processed is a steel strip, in the slitting step preceding the multi-step plastic working, it is necessary to send out a steel sheet from the steel strip by pinch rolls. Further, in order to secure the die-sticking resistance in the multi-step press forming, it is important to reduce the static friction coefficient of the steel sheet fed from the steel strip, but if the static friction coefficient is excessively reduced, the steel sheet slides on the pinch roll, and the probability of occurrence of blanking (blank) becomes high. As described above, the roll transfer property (slip resistance) and the mold-sticking resistance in the multi-step press molding under high surface pressure are properties in a back-to-back relationship with each other. In order to continuously perform multi-step plastic working while feeding a steel sheet from a steel strip, it is initially required to satisfy both of the above-mentioned slip resistance and sticking resistance.
Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide a surface-treated steel strip and a method for producing a surface-treated steel strip, which can achieve both of slip resistance and blocking resistance.
Means for solving the problems
The present inventors have conducted intensive studies to solve the above problems, and as a result, have obtained the following findings.
(A) Before forming a lubricating coating layer on the surface of a base steel sheet as a base material, zinc phosphate crystals are deposited in island-like shapes on the surface of the base steel sheet. At this time, the shape of the zinc phosphate crystals is controlled so that a part of the zinc phosphate crystals is exposed (protruded) from the surface of the lubricating coating layer. Thus, a surface-treated steel strip in which the irregularities due to the zinc phosphate crystals are exposed (protruded) from the surface of the lubricating coating layer is finally obtained.
(B) The zinc phosphate crystals have no lubricity, and therefore the coefficient of static friction of the surface-treated steel strip in which irregularities are formed on the surface of the lubricating coating layer by the zinc phosphate crystals is larger than the coefficient of static friction of the lubricating coating layer alone. The static friction coefficient of the surface-treated steel strip is correlated with the area ratio of the zinc phosphate crystals exposed from the surface of the lubricating coating layer (hereinafter, sometimes referred to as the exposed area ratio). That is, the static friction coefficient of the surface-treated steel strip can be controlled by controlling the exposed area ratio of the zinc phosphate crystals.
(C) When the surface-treated steel strip is conveyed while being held between a pair of pinch rolls, a pressure (surface pressure) is applied to the surface-treated steel strip by the pinch rolls, but the pressure is not so high as to crush the zinc phosphate crystals exposed from the lubricating coating layer. In other words, the irregularities of the surface of the lubricating coating layer are not flattened by the pinch roll. Therefore, the static friction coefficient of the surface-treated steel strip below the pinch rolls can be maintained to be constant at a large value. As a result, the slip of the surface-treated steel strip under the pinch rolls is suppressed, and therefore, the slip resistance under the pinch rolls (low surface pressure) is improved.
(D) On the other hand, when the surface-treated steel strip is subjected to multi-stage press molding by a press apparatus provided downstream of the pinch roll, since a very large pressure (surface pressure) is applied to the surface-treated steel strip, the zinc phosphate crystals exposed from the lubricating coating layer are crushed, and the irregularities on the surface of the lubricating coating layer are flattened. Thus, the static friction coefficient of the surface-treated steel strip under the pressurizing device becomes the static friction coefficient inherent in the lubricating coating layer. As a result, the original lubricity (slidability) of the surface-treated steel strip can be exhibited by the press apparatus, and therefore, the die-sticking resistance under the press apparatus (under high surface pressure) is improved.
The present invention has been completed based on the above-described findings, and the gist thereof is as follows.
[1]
A surface-treated steel strip comprising:
a base steel plate;
a zinc phosphate coating layer formed in an island shape on the surface of the base steel sheet and formed of needle-like zinc phosphate crystals; and the combination of (a) and (b),
a lubricating coating layer which covers the surface of the base steel sheet and a part of the zinc phosphate coating layer and contains at least a lubricating component,
the exposed area ratio of the zinc phosphate crystal to the surface of the lubricating coating layer is 25% to 90%.
[2]
The surface-treated steel strip according to item [1], wherein the zinc phosphate crystals have an average particle size in the major axis direction of 25 to 70 μm and an average particle size in the minor axis direction of 3 to 10 μm.
[3]
According to [1]Or [2 ]]The surface-treated steel strip according to any one of the preceding claims, wherein the zinc phosphate coating layer is attached in an amount of 1.5g/m per surface2～15.0g/m2。
[4]
According to [1]～[3]The surface-treated steel strip as claimed in any one of the above items, wherein the amount of the lubricating coating layer adhered is 1.0g/m per one surface2～12.0g/m2。
[5]
According to [1]～[4]The surface-treated steel strip described in any one of the above, wherein the aforementioned lubricating coating layer comprises: SiO 22/M2An alkali metal silicate having a molar ratio of 2 to 5 represented by O (M is an alkali metal); and a polymer wax comprising at least one of a polyethylene wax and a polypropylene wax having an average particle diameter of 0.1 to 3.0 [ mu ] m,
the solid content of the alkali silicate is 60 to 90 mass% and the solid content of the polymer wax is 5 to 40 mass% based on the total solid content of the lubricating coating layer.
[6]
A method of manufacturing a surface treated steel strip comprising the steps of:
a hardening and tempering step, wherein the surface of the base steel plate is hardened and tempered by using a surface conditioner containing colloidal titanium;
a zinc phosphate coating layer forming step of growing needle-like crystals of zinc phosphate into island-like crystals on the surface of the base steel sheet subjected to surface conditioning, and forming a zinc phosphate coating layer on the surface of the base steel sheet; and the combination of (a) and (b),
a lubricating coating layer forming step of applying a lubricating treatment agent containing at least a lubricating component in an amount of 1.0g/m per one surface2～12.0g/m2The method (2) of coating the surface of the base steel sheet and the surface of the zinc phosphate coating layer with the zinc phosphate crystals to form a lubricating coating layer, wherein the area ratio of the zinc phosphate crystals exposed on the surface of the lubricating coating layer is 25% to 90%.
[7]
The method of producing a surface-treated steel strip according to item [6], wherein the base steel sheet is heated in the zinc phosphate coating layer forming step.
[8]
The method for producing a surface-treated steel strip according to item [7], wherein the base steel strip is heated by contacting with steam.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, low-surface-pressure slip resistance and high-surface-pressure blocking resistance, which are back-reflection properties, can be simultaneously achieved.
Drawings
Fig. 1 is an explanatory view of a surface-treated steel strip according to an embodiment of the present invention.
Fig. 2 (a) is an explanatory view schematically showing the structure of a surface-treated steel strip according to the same embodiment.
Fig. 2 (B) is an explanatory view schematically showing the structure of the surface-treated steel strip according to the same embodiment.
FIG. 3A is a front view showing an example of a zinc phosphate treatment bath for forming a zinc phosphate coating layer on the surface of a steel strip. FIG. 3 (B) is a plan view showing an example of a zinc phosphate treatment bath for forming a zinc phosphate coating layer on the surface of a steel strip.
Fig. 4 is a flowchart showing an example of a flow of a method for manufacturing a surface-treated steel strip according to the same embodiment.
Fig. 5 is an explanatory view schematically showing a test method of the mold-sticking resistance.
Fig. 6 is an explanatory view schematically showing a method of testing the slip resistance.
FIG. 7 is an enlarged photograph of a surface-treated steel strip of a comparative example.
FIG. 8 is an enlarged photograph of a surface-treated steel strip of a comparative example.
FIG. 9 is an enlarged photograph of a surface-treated steel strip of an example of the present invention.
FIG. 10 is an enlarged photograph of a surface-treated steel strip of an example of the present invention.
Detailed Description
An example of the embodiment of the present invention will be described below with reference to the drawings. In the present specification and the drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant description thereof is omitted.
(surface-treated Steel strip)
First, a surface-treated steel strip according to an embodiment of the present invention will be described in detail with reference to B in fig. 1 to 2. Fig. 1 is an explanatory view for explaining the surface-treated steel strip of the present embodiment, and a in fig. 2 and B in fig. 2 are explanatory views schematically showing the structure of the surface-treated steel strip of the present embodiment.
As described in detail below, the surface-treated steel strip 10 of the present embodiment is subjected to a high-lubrication treatment on the base steel sheet 101. As schematically shown in fig. 1, the surface-treated steel strip 10 is unwound from a wound state in a coil form by the pinch roll 1 in a slitting step preceding a multi-step plastic working, and is continuously passed in a predetermined passing direction X. The surface-treated steel strip 10 of the through plate is processed into a target product by a multi-step press working using a die 2 conforming to the target product.
As described above, in order to prevent seizure and sticking of the surface-treated steel strip 10 (base steel sheet 101) and the dies 2, which are passed through the steel strip, it is important to reduce the coefficient of static friction of the surface-treated steel strip 10, and it is important that the surface-treated steel strip 10 has a certain degree of coefficient of static friction in order to stably unwind the surface-treated steel strip 10 from a wound state into a coil shape by the pinch roll 1. Therefore, in the surface-treated steel strip 10 of the present embodiment, as shown in fig. 2 a and 2B, the surface treatment described below is performed on the surface of the base steel sheet 101 serving as the base material, and a surface-treated layer composed of 2 layers is formed.
As shown in fig. 2 a and 2B, the surface-treated steel strip 10 of the present embodiment includes: a base steel plate 101 serving as a base material; a zinc phosphate coating layer 103 formed on the base steel sheet 101; and a lubricating coating layer 105 formed on the zinc phosphate coating layer 103. The zinc phosphate coating layer 103 and the lubricating coating layer 105 may be formed on only one surface of the base steel sheet 101 as shown in a of fig. 2, or may be formed on both surfaces of the base steel sheet 101 facing each other as shown in B of fig. 2.
[ base Steel sheet 101]
The base steel sheet 101 is used as a base material of the surface-treated steel strip 10. The base steel sheet 101 of the present embodiment is not particularly limited, and a known steel sheet that can realize the characteristics required for the target product produced by the subsequent multi-step plastic working process can be used. The above-mentioned known steel sheet is not particularly limited in its production method and material, and can be produced from a usual ingot production process through various known processes such as hot rolling, pickling, cold rolling, annealing, and temper rolling. Needless to say, the base steel sheet 101 may be not only a carbon steel sheet but also a special steel sheet such as a stainless steel sheet or a high alloy steel sheet.
As an example of such a base steel sheet 101, a hot-rolled steel sheet having the following chemical components can be given.
A hot-rolled steel sheet as an example of the base steel sheet 101 contains, in mass%, C: 0.070% -0.080%, Si: 0.030-0.080%, Mn: 1.15% -1.30%, P: 0.015% -0.028%, S: 0.000 to 0.040 percent, and the balance of Fe and impurities.
By using such a hot-rolled steel sheet as the base steel sheet 101, the strength of the object to be manufactured can be improved.
[ Zinc phosphate coating layer 103]
The zinc phosphate coating layer 103 plays a role of improving the adhesion between the base steel sheet 101 and the lubricating coating layer 105. The zinc phosphate coating layer 103 is an aggregate of needle-like zinc phosphate crystals composed of needle-like crystals of zinc phosphate deposited by a chemical reaction on the surface of the base steel sheet 101. The precipitated needle-like crystals of zinc phosphate do not completely cover the surface of the steel base plate 101, but remain partially uncovered with the crystals of zinc phosphate, as schematically shown in fig. 2 a and 2B. As a result, the needle-like crystals of zinc phosphate are distributed in island-like shapes on the surface of the base steel sheet 101, and the surface of the base steel sheet 101 where the needle-like crystals of zinc phosphate are not present is present as flat portions. The zinc phosphate coating layer 103 is divided into a plurality of portions on the surface of the base steel sheet 101, and is present in a state independent of each other. In the present invention, the state of the zinc phosphate coating layer 103 which is divided into a plurality of portions on the surface of the base steel sheet 101 and is present in an independent state is referred to as an "island-like" state.
As will be described later, in the zinc phosphate coating layer forming step of forming the zinc phosphate coating layer 103 on the base steel sheet 101 subjected to surface conditioning using a specific surface conditioner, the base steel sheet 101 is heated, and therefore the zinc phosphate coating layer 103 is formed of needle-like crystals of zinc phosphate having a larger ratio of particle sizes in the major axis direction to the minor axis direction. The amount of the zinc phosphate coating layer 103 deposited is preferably 1.5g/m per surface2～15.0g/m2. The amount of the zinc phosphate coating layer 103 deposited is more preferably 3.0g/m per surface2～15.0g/m2. By setting the amount of zinc phosphate coating layer 103 to be deposited within the above range, the lubricating coating layer 105 can be more reliably adhered to the base steel plate 101, and the lubricating coating layer 105 can be more reliably held until the final step of the forming process without the zinc phosphate coating layer 103 disappearing during the forming process under high surface pressure.
The acicular crystals of zinc phosphate constituting the zinc phosphate coating layer 103 of the present embodiment preferably have an average particle size in the major axis direction of 25 to 70 μm and an average particle size in the minor axis direction of 3 to 10 μm. The average particle size of the needle-like crystals of zinc phosphate is more preferably 25 to 50 μm in the major axis direction and 3 to 5 μm in the minor axis direction. The zinc phosphate crystals constituting the zinc phosphate coating layer 103 have the above average particle size, and thus the above adhesion can be more reliably achieved.
The acicular crystal of zinc phosphate constituting the zinc phosphate coating layer 103 of the present embodiment is preferably an acicular crystal having an average particle size ratio of 2.5 or more in the major axis direction and the minor axis direction. By precipitating needle-like crystals of zinc phosphate having such an average particle diameter, adhesion between base steel sheet 101 and lubricating coating layer 105 can be more reliably achieved.
The zinc phosphate coating layer 103 can be formed using a known treatment liquid containing zinc phosphate and capable of precipitating needle-like crystals of zinc phosphate. Such a treatment liquid is not particularly limited, and examples thereof include: a reactive zinc phosphate treatment liquid for plastic working (more specifically, a reactive zinc phosphate treatment liquid for plastic working in which the treatment time for complete covering is 20 seconds or more). In forming the zinc phosphate coating layer 103, the zinc phosphate treatment solution may be brought into contact with the base steel sheet 101 by a spray coating method or a dipping method, or may be subjected to electrolytic treatment in a reaction tank containing the zinc phosphate treatment solution.
In order to deposit zinc phosphate crystals in island-like shapes on the base steel sheet 101, the zinc phosphate treatment may be terminated before the zinc phosphate crystals completely cover the entire surface of the base steel sheet 101. Therefore, the contact time and the electrolysis time of the base steel sheet 101 with the zinc phosphate treatment liquid can be limited to a short time. That is, a commercially available zinc phosphate treatment liquid for plastic working can be used to complete the treatment in a shorter time than the indicated treatment time. Specific treatment time and electrolysis condition can be specified by examining the correspondence between the treatment time (or electrolysis condition) and the amount of deposition in advance, and the treatment time (electrolysis condition) that can achieve the above-mentioned preferable amount of deposition can be specified. In addition, in order to deposit zinc phosphate crystals in island-like shapes on base steel sheet 101, it is also effective to heat base steel sheet 101 in the zinc phosphate coating layer forming step of forming zinc phosphate coating layer 103.
Whether or not the zinc phosphate crystals precipitated by the above-described treatment are island-shaped can be determined by observing the surface of the base steel sheet 101 after the zinc phosphate treatment with a microscope. Specifically, the surface of the zinc phosphate-treated base steel sheet 101 was observed with a Scanning Electron Microscope (SEM), and it was determined that zinc phosphate crystals were formed in island shapes when the area of the flat portion obtained by the two-image processing was 30% or more. The observation of the zinc phosphate crystals may be performed before or after the formation of the lubricating coating layer 105 described later. However, when observation is performed after the formation of the lubricating coating layer 105, SEM observation at a high acceleration voltage is performed in order to observe the zinc phosphate crystals through the lubricating coating layer 105. Specifically, by setting the acceleration voltage to 20kV or more, the crystal of zinc phosphate can be observed through the lubricating coating layer 105, and the area ratio of the flat portion can be obtained. Note that, in the observation before the formation of the lubricating coating layer 105, the zinc phosphate crystals were observed even at a lower acceleration voltage.
Here, when forming the zinc phosphate coating layer 103 on the base steel sheet 101, the surface of the base steel sheet 101 is subjected to a thermal refining treatment using a surface conditioner containing colloidal titanium prior to the above-described zinc phosphate treatment. The zinc phosphate crystals precipitate from the surface of the base steel sheet 101 to which the components of the surface conditioner do not adhere, but the area of the surface of the base steel sheet 101 exposed is suppressed because the colloidal titanium is coarse colloidal particles. As a result, by performing surface conditioning treatment with the surface conditioner containing colloidal titanium, needle-like crystals of zinc phosphate having the above-described preferred average particle size ratio can be more reliably precipitated.
[ lubricating coating layer 105]
As schematically shown in fig. 2 a and 2B, the lubricating coating layer 105 is a layer that is located on the surface of the base steel sheet 101, covers the surface of the base steel sheet 101 and at least a part of the zinc phosphate coating layer 103, and has at least a part of the zinc phosphate crystals exposed on the surface. The lubricating coating layer 105 is a layer containing at least a lubricating component, and is preferably formed of a binder component and a lubricating component.
In the surface-treated steel strip 10 of the present embodiment, by forming the above-described island-shaped zinc phosphate crystals, the lubricating component and the binder component contained in the lubricating coating layer 105 are held between the island-shaped zinc phosphate crystals as schematically shown in fig. 2 a and fig. 2B. When a high surface pressure is applied to the surface of the surface-treated steel strip 10 during multi-step plastic working (for example, multi-step press working), the lubricating component held between the island-like zinc phosphate crystals flows out between the base steel sheet 101 and the die. As a result, the coefficient of static friction of the lubricating coating layer 105 is reduced, and the lubricating performance is exhibited, thereby achieving the anti-sticking property.
The amount of the lubricating coating layer 105 adhered was 1.0g/m per one surface2～12.0g/m2The area ratio (area ratio per unit area) of the zinc phosphate crystals exposed on the surface of the lubricating coating layer 105 is 25% to 90%. When the amount of adhesion of the lubricating coating layer 105 and the area ratio of the zinc phosphate crystals exposed on the surface of the lubricating coating layer 105 are set to the above ranges, the above-described mold adhesion resistance and the above-described roll slip resistance can be achieved together.
The adhesion amount of the lubricating film layer 105 is less than 1.0g/m2In the case of (3), the amount of the lubricating component held as the lubricating coating layer 105 is not sufficient, and sufficient mold adhesion resistance cannot be achieved, which is not preferable. Further, the amount of adhesion of the lubricating coating layer 105 exceeded 12.0g/m2In the case of (3), the amount of the lubricating component held as the lubricating coating layer 105 becomes excessive, and the slip resistance cannot be achieved, which is not preferable. The amount of adhesion of the lubricating coating layer 105 to one surface is more preferably 2.0g/m2～9.0g/m2。
The amount of adhesion of the lubricating coating layer 105 is also affected by the amount of adhesion of the zinc phosphate coating layer 103. That is, when the amount of adhesion of the zinc phosphate coating layer 103 is small, the amount of the lubricating coating layer 105 that can be held is also small, and conversely, when the amount of adhesion of the zinc phosphate coating layer 103 is large, the amount of the lubricating coating layer 105 that can be held is also large. For example, the amount of adhesion of the zinc phosphate coating layer 103 is 1.5g/m2～8.0g/m2In the case of (3), the amount of adhesion of the lubricating coating layer 105 is preferably 1.0g/m2～6.0g/m2On the other hand, the amount of adhesion of the zinc phosphate coating layer 103 exceeds 8.0g/m2And 15.0g/m2In the following cases, the amount of adhesion of the lubricating coating layer 105 is preferably more than 6.0g/m2And is 12.0g/m2About the following.
The amount of the zinc phosphate coating layer 103 adhered was 1.5g/m on one side2～8.0g/m2The amount of the polymer particles adhered can be adjusted to 1.0g/m2～6.0g/m2The left and right lubricating coating layers 105 are suitably adhered to the base steel plate 101, and the zinc phosphate coating layer 103 does not disappear even in the molding process under high surface pressure, and the lubricating coating layers 105 can be held until the final step of the molding process.
On the other hand, in automobile parts such as direct clutches, the parts are subjected to a multi-step circleAfter the barrel is molded, there is a part molded into a tooth shape around it. These members were subjected to repeated slide molding under a higher surface pressure, and therefore the amount of adhesion of the zinc phosphate coating layer 103 was 8.0g/m per surface2In the following case, the zinc phosphate coating layer 103 disappears due to sliding in the middle of molding, and there is a concern that dimensional accuracy of the finished product is lowered and cracks may occur in the middle of molding. In the above case, the amount of adhesion of the zinc phosphate coating layer 103 is preferably more than 8.0g/m2And 15.0g/m2The amount of the lubricating coating layer 105 adhering is more than 6.0g/m2And is 12.0g/m2About the following.
Here, the lubricating coating layer 105 of the present embodiment preferably contains SiO as the binder component2/M2An alkali metal silicate having a molar ratio of 2 to 5 represented by O (M is an alkali metal selected from Li, Na, K, etc.), and a polymer wax comprising at least one of a polyethylene wax and a polypropylene wax having an average particle diameter of 0.1 to 3.0 μ M as the lubricating component.
By using the alkali silicate as a binder component, a lubricating component can be appropriately retained in the coating film, and a strong continuous coating film having excellent heat resistance can be formed on the surface of the steel strip. As a result, the surface-treated steel strip of the present embodiment can exhibit a seizure resistance function of preventing direct contact with the metal of the mold, a rust resistance function derived from the barrier property of the dense alkaline coating, and the like. Here, when the molar ratio is less than 2, the film strength cannot be sufficiently obtained, and the plastic workability is deteriorated, which is not preferable. When the molar ratio exceeds 5, the plastic workability is deteriorated, and the stability of the aqueous alkali silicate solution used for forming the coating film is deteriorated, which is not preferable because of poor practicality. SiO in alkali metal silicate2/M2The molar ratio represented by O is more preferably 3 to 4.
By using the polymer wax as the lubricating component, swelling of the lubricating coating layer 105 can be suppressed, and the plastic workability of the lubricating coating layer 105 can be further improved. Here, when the average particle diameter of the polymer wax is less than 0.1 μm, the oil diffusion from the interface of the polymer wax into the coating film becomes remarkable, and the oil resistance of the coating film is deteriorated, so that it is not preferable, and when the average particle diameter of the polymer wax exceeds 3.0 μm, the dispersion of the polymer wax in the chemical solution is deteriorated, and it is difficult to form a uniform coating film. The average particle diameter of the polymer wax is more preferably 0.5 to 1.5. mu.m. By using the polymer wax having the above-mentioned average particle diameter as the lubricating component, the lubricating component is easily filled into the concave portions of the irregularities of the zinc phosphate crystals, and as a result, the zinc phosphate crystals are easily exposed from the surface of the lubricating coating layer 105.
The solid content of the alkali silicate is preferably 60 to 90 mass% based on the total solid content of the lubricating coating layer 105, and the solid content of the polymer wax is preferably 5 to 40 mass% based on the total solid content of the lubricating coating layer 105.
When the solid content of the alkali silicate is less than 60% by mass, the continuity of the glassy coating formed from the alkali silicate is poor, and the possibility of obtaining a coating strength that can withstand plastic working is reduced, which is not preferable. When the solid content of the alkali silicate exceeds 90 mass%, the strength of the obtained coating film is saturated, which is not preferable because the cost is not favorable. The solid content of the alkali silicate is more preferably 70 to 80 mass% based on the total solid content of the lubricating film layer 105.
When the solid content of the polymer wax is less than 5 mass%, the amount of the lubricating component held by the lubricating coating layer 105 is insufficient, and the possibility of sufficient lubricating performance being exhibited is lowered, which is not preferable. When the solid content of the polymer wax exceeds 40 mass%, the amount of the lubricating component held by the lubricating coating layer 105 becomes excessive, and the possibility of sufficient slip resistance being exhibited is lowered, which is not preferable. The solid content of the polymer wax is more preferably 3 to 10 mass% based on the total solid content of the lubricating coating layer 105.
The lubricating coating layer 105 of the present embodiment can be formed by mixing the above-described lubricating treatment agent of the lubricating component in the solution or dispersion of the binder component and applying the mixture. The solvent used here may be any of water, an organic solvent, and a mixture thereof, and an aqueous solvent (water, or a mixed solvent of water and a water-miscible organic solvent such as alcohol) is preferably used in the working environment. The lubricant coating layer 105 having the solid content can be formed by adding a binder component (for example, an alkali silicate) in an amount of 60 to 90 mass% based on the total solid content of the lubricant treatment agent and a lubricant component (for example, a polymer wax) in an amount of 5 to 40 mass% based on the total solid content of the lubricant treatment agent to the solvent, and appropriately coating and drying the mixture.
In order to improve the dispersibility of the lubricant component, a known surfactant may be added to the lubricant. In order to adjust the viscosity of the lubricating agent, a viscosity modifier may be added within a range that does not affect the coating strength of the lubricating coating layer 105. As the viscosity modifier, a commonly used one can be used, and examples thereof include organic polymer thickeners such as hydroxyethyl cellulose, carboxymethyl cellulose, polyacrylamide, sodium polyacrylate, polyvinylpyrrolidone, and polyvinyl alcohol. In the case of using the viscosity modifier, the content thereof is preferably less than 10 mass% with respect to the total solid content mass of the lubricating coating layer 105.
When the above-mentioned lubricating agent is applied to the base substrate 3 and the zinc phosphate coating layer 103, a known method such as a dipping treatment, a shower ring (shower ring) treatment, or a roll coating treatment can be used. The temperature and the coating time of the lubricating agent are not particularly limited as long as the surfaces of the green sheet 3 and the zinc phosphate coating layer 103 are sufficiently covered with the lubricating agent. The drying temperature of the lubricating treatment agent is also not particularly limited, and may be appropriately set according to the components contained in the lubricating treatment agent.
[ area ratio (25% to 90%) of zinc phosphate crystals exposed on the surface of the lubricating coating layer 105]
In the lubricating coating layer 105 of the present embodiment, as shown in a of fig. 2 and B of fig. 2, a part of the zinc phosphate crystal (zinc phosphate coating layer 103) is exposed to a part of the surface of the lubricating coating layer 105, and thus a decrease in the static friction coefficient of the lubricating coating layer 105 can be favorably suppressed. As a result, the roll resistance when the steel sheet is unwound from the steel strip can be achieved.
When the area ratio of the zinc phosphate crystals exposed to the surface of the lubricating coating layer 105 is less than 25%, the degree of suppression of the reduction in the static friction coefficient of the lubricating coating layer 105 is insufficient, and sufficient slip resistance cannot be achieved, which is not preferable. When the area ratio of the exposed zinc phosphate crystals on the surface of the lubricating coating layer 105 exceeds 90%, the degree of suppression of the reduction in the static friction coefficient of the lubricating coating layer 105 becomes excessive, and sufficient mold adhesion resistance cannot be achieved, which is not preferable. The area ratio of the zinc phosphate crystals exposed on the surface of the lubricating coating layer 105 is more preferably 30% to 60%.
When the amount of adhesion of the lubricating coating layer 105 and the area ratio of zinc phosphate crystals exposed on the surface of the lubricating coating layer 105 are in the above ranges, the coefficient of static friction of the lubricating coating layer 105 of the present embodiment is 0.10 to 0.20. The coefficient of static friction of the lubricating film layer 105 is more preferably 0.12 to 0.15.
By setting the amount of adhesion of the zinc phosphate coating layer 103 within the above-described preferable range, the area ratio of the zinc phosphate crystals exposed to the lubricating coating layer 105 can be set within the above-described range more reliably.
In addition, in order to expose the zinc phosphate crystals (zinc phosphate coating layer 103) to the surface of the lubricating coating layer 105 at an area ratio of 25% to 90%, it is necessary to make the surface area ratio 1.5g/m per surface area2～15.0g/m2The zinc phosphate coating layer 103 of (2) is island-shaped, and for this reason, a method of raising the temperature of the zinc phosphate treatment or extending the treatment time is considered. However, since water is a solvent for the temperature of the zinc phosphate treatment bath, it is substantially difficult to raise the treatment temperature to 100 ℃ or higher, and on the other hand, if the treatment time is prolonged, crystals of the precipitated zinc phosphate coating are densely formed on the steel strip surface, and the zinc phosphate coating layer 103 does not become island-like. In addition, the increase in the temperature of the zinc phosphate treatment bath necessitates an increase in the treatment bath temperatureThe temperature of the body, and therefore, there is a problem in that energy costs increase. Further, when the zinc phosphate treatment is performed in a zinc phosphate treatment bath in which the treatment time is prolonged for a certain period of time, there is also a problem that productivity is lowered.
Therefore, the island-like particles are formed in an island shape at a rate of 1.5g/m per surface2～15.0g/m2As an example of the method for forming the zinc phosphate coating layer 103, the following method is proposed: for the temperature of the zinc phosphate treatment bath, the temperature was locally raised with steam. According to the above method, the amount of adhesion of the zinc phosphate crystals is increased, and the zinc phosphate crystals are further formed into needle-like (sharp) shapes, so that the bulkiness of the zinc phosphate crystals is increased, and the heads of the zinc phosphate crystals are more exposed from the lubricating coating layer. The zinc phosphate crystals themselves do not have slidability at low surface pressure, and therefore the coefficient of static friction becomes large. On the other hand, zinc phosphate crystals are crushed under high surface pressure and contribute to sliding properties together with the lubricating coating layer, and therefore, moldability equivalent to that of the conventional art, that is, mold sticking resistance (simulation by L-shaped press molding), can be maintained at high surface pressure.
Here, it will be used to form the island-like shape with 1.5g/m per side2～15.0g/m2An example of the apparatus for forming the zinc phosphate coating layer 103 is shown in A, B in FIG. 3. The apparatus shown at A, B in fig. 3 is configured as follows: the surface of the base steel sheet 101 passing through the zinc phosphate treatment bath 20 is brought into contact with steam generated in the heater 21. In the zinc phosphate treatment bath 20, steam generated by heating by the heater 21 is stirred by the stirrer 22 and brought into contact with the surface of the base steel sheet 101. When forming the zinc phosphate coating layer 103, local heating is performed in the zinc phosphate treatment bath 20, and if the treatment temperature is increased by bringing the surface of the base steel sheet 101 into contact with steam, the zinc phosphate coating treatment bath 20 as a whole does not become significantly high in temperature, and the zinc phosphate coating layer 103 can be easily formed in an island shape within a short treatment time without impairing productivity. The higher the vapor temperature, the more the formation of the zinc phosphate coating layer 103 is promoted. Therefore, the vapor temperature is preferably 100 ℃ or higher, more preferably 120 ℃ or higher. When the temperature of the steam becomes high, the energy cost increases and the effect thereof is saturated, and therefore, the steam temperature is preferably 200 ℃.
When the surface of the base steel sheet 101 is brought into contact with steam in the zinc phosphate treatment bath 20 in this manner, island-like shapes are formed on the steel strip at 1.5g/m per surface2～15.0g/m2The reason for the zinc phosphate coating is not clear. However, on the surface of the base steel sheet 101, the growth of zinc phosphate crystals starting from the partial growth points of the zinc phosphate crystals is inhibited, and zinc phosphate coatings are formed in island-like shapes, while the zinc phosphate crystals formed in island-like shapes are activated by steam to raise the temperature to 100 ℃ or higher and are brought into contact with the zinc phosphate treatment liquid in the zinc phosphate treatment bath 20, whereby the growth is further promoted, and it is presumed that it is possible to form the zinc phosphate crystals in island-like shapes at 1.5g/m per one surface2～15.0g/m2The zinc phosphate film of (1).
Note that the pattern is formed in island form at 1.5g/m per side2～15.0g/m2The apparatus for forming the zinc phosphate coating layer 103 is not particularly limited. The base steel sheet 101 may be in direct contact with steam, or the base steel sheet 101 may be mixed with a zinc phosphate treatment liquid and then in direct contact with steam. Further, steam generated from a heater 21 provided on the wall surface of the zinc phosphate treatment bath 20 may be stirred in a stirrer 22 so that the steel base plate 101 is simultaneously brought into contact with the zinc phosphate treatment liquid and the steam.
By using the apparatus shown in A, B in FIG. 3, the zinc phosphate coating layer 103 can be formed in an island shape, and the maximum value of the amount of adhesion of the zinc phosphate coating layer 103 by the steam blowing can be 15.0g/m2Left and right. The amount of zinc phosphate coating layer 103 deposited was set to 1.5g/m per surface2～15.0g/m2The lubricating coating layer 105 can be more reliably adhered to the base steel plate 101, and the zinc phosphate coating layer 103 does not disappear even in the molding process under high surface pressure, and the lubricating coating layer 105 can be more reliably held until the final step of the molding process.
The surface-treated steel strip 10 of the present embodiment is described in detail above with reference to fig. 1 to 3.
< method of measuring values of various physical Properties >
Next, a method for measuring various physical property values achieved by the surface-treated steel strip 10 of the present embodiment will be briefly described.
First, the average particle size of the zinc phosphate crystals constituting the zinc phosphate coating layer 103 and the average particle size of the polymer wax contained in the lubricating coating layer 105 can be measured by a known measurement method such as observation of the surface of a steel sheet under a low acceleration voltage by a Field Emission scanning electron Microscope (FE-SEM).
The amount of adhesion to each surface of the zinc phosphate coating layer 103 and the lubricating coating layer 105 can be measured by a known measurement method such as a gravimetric method.
The thickness of the zinc phosphate coating layer 103 and the lubricating coating layer 105 can be measured by observing the cross section of the surface-treated steel strip with an electron microscope such as an SEM, but the thickness of the lubricating coating layer 105 can also be measured by the following method. First, the emission spectrum intensity of the component (e.g., Si) of the lubricating coating layer 105 and the zinc phosphate crystal component (e.g., Zn) was measured with a Glow Discharge Spectrometer (GDS) from the surface along the depth direction of the cross section of the surface-treated steel strip 10. By the above measurement, 2 peaks corresponding to each component can be obtained in the emission spectrum. Here, the thickness corresponding to each 50% value of the peak intensity of 2 components (Si is a 50% value on the base steel sheet side, and Zn is a 50% value on the surface layer side of the steel strip) may be set as the thickness of the lubricating coating layer 105.
The area ratio of the zinc phosphate crystals exposed on the surface of the lubricating coating layer 105 can be obtained by observing the surface of the surface-treated steel strip 10 with an electron microscope such as SEM and specifying the area of the zinc phosphate crystals detected in the field of view by a known method. Here, when the area ratio is specified, it is preferable to observe a plurality of places on the surface of the surface-treated steel strip 10 and calculate the average of the specified area ratios.
The static friction coefficient of the lubricating coating layer 105 can be measured by various test methods such as a round bead pull test described in detail below.
The method for measuring various physical property values of the surface-treated steel strip 10 of the present embodiment has been described above simply. The above-described measurement method is merely an example, and the physical property values may be specified by other known measurement methods.
(method for producing surface-treated Steel strip)
Next, a method for producing the surface-treated steel strip 10 according to the present embodiment will be described with reference to fig. 4. Fig. 4 is a flowchart showing an example of the flow of the method for producing the surface-treated steel strip 10 according to the present embodiment.
In the method of manufacturing the surface-treated steel strip 10 of the present embodiment, first, pretreatment such as degreasing treatment and cleaning treatment is performed on a steel strip wound around a predetermined base steel plate 101 as necessary (pretreatment step S101).
Thereafter, the surface of the base steel sheet 101 is quenched and tempered with a surface conditioner containing colloidal titanium (quenching and tempering step S103). As a result, colloidal titanium having a coarse particle diameter adheres to the surface of the base steel sheet 101.
Next, needle-like crystals of zinc phosphate are precipitated on the surface of the surface-conditioned base steel sheet 101 by the method described above (zinc phosphate coating layer forming step S105). As a result, needle-like crystals of zinc phosphate are deposited in island-like shapes on the surface of base steel sheet 101, and zinc phosphate coating layer 103 is formed. As described above, by performing the deposition of zinc phosphate with the apparatus shown by A, B in fig. 3, the zinc phosphate coating layer 103 can be formed in an island shape.
Next, a lubricating agent is applied to base steel sheet 101 and zinc phosphate coating layer 103, and dried under appropriate drying conditions, thereby forming lubricating coating layer 105 (lubricating coating layer forming step S107). Thereby, the surface-treated steel strip 10 shown in fig. 2 a and 2B can be manufactured.
Thereafter, if necessary, the manufactured surface-treated steel strip 10 may be subjected to a known post-treatment (post-treatment step S109).
An example of the flow of the method for producing the surface-treated steel strip 10 according to the present embodiment is briefly described above with reference to fig. 4.
Examples
Hereinafter, the surface-treated steel strip of the present invention and the method for producing the surface-treated steel strip will be specifically described while showing examples and comparative examples. The following examples are merely examples of the surface-treated steel strip and the method for producing the surface-treated steel strip of the present invention, and the surface-treated steel strip and the method for producing the surface-treated steel strip of the present invention are not limited to the examples described below.
In the following examples, "%" means "% by mass" unless otherwise specified. In the following examples, the amount of adhesion refers to the amount of adhesion per surface.
(1) Zinc phosphate treatment of steel sheet
Zinc phosphate treatment was performed on both surfaces of a cut sheet (300 mm. times.300 mm) of an SPH590 steel sheet (hot-rolled steel sheet having a tensile strength of 590MPa or more) having a thickness of 3.2mm by immersion treatment. In this case, in the present example, steam generated from a heater provided on the wall surface of the apparatus was stirred by a stirrer on both surfaces of the steel sheet in the dipping treatment, and the steel sheet was brought into contact with the steam at 100 to 120 ℃ for 5 seconds. The dipping time was varied from 5 seconds to 120 seconds to adjust the amount of zinc phosphate crystals adhered, thereby obtaining zinc phosphate-treated steel sheets shown in Table 1. The amount of zinc phosphate crystals adhered was determined from the change in the mass of the steel sheet before and after the zinc phosphate treatment.
(2) Formation of lubricating coating
A binder component, a lubricant component, and an extreme pressure additive described below were added to pure water (deionized water), sufficiently stirred to be dispersed, and diluted with pure water so that the amount of solid components became 20%, to prepare a chemical solution used for coating. The chemical solution was applied to the surface of the zinc phosphate-treated steel sheet one by one using a bar coater, and dried at 60 ℃ to form a lubricating coating on the surface, thereby producing a lubricating-treated steel sheet. The amount of adhesion of the lubricating coating was calculated from the change in mass of the steel sheet before and after the formation of the lubricating coating.
Chemical solution (2-1)
A) Binder component
Sodium metasilicate (SiO)2/Na2Molar ratio of O: 4)
acrylic resin (monomer composition: acrylic acid 8%, methacrylic acid 52%, butyl acrylate 40%)
B) Lubricating composition
Organic high molecular compound: polyethylene wax (molecular weight 20000, average particle size 3 μm)
Solid lubricants: molybdenum disulfide (average particle size 2 μm)
Soap: sodium stearate
C) Extreme pressure additive
Esters of phosphorous acid
D) Content of solid component
The solid content of sodium metasilicate relative to the total solid content of the lubricating coating layer: 88 percent
The amount of solid component of the polyethylene wax relative to the amount of total solid component of the lubricating coating layer: 5 percent of
Chemical solution (2-2)
A) Binder component
Sodium metasilicate (SiO)2/Na2Molar ratio of O: 5)
acrylic resin (monomer composition: acrylic acid 8%, methacrylic acid 52%, butyl acrylate 40%)
B) Lubricating composition
Organic high molecular compound: polyethylene wax (molecular weight 2000, average particle diameter 0.5 μm)
Solid lubricants: molybdenum disulfide (average particle size 2 μm)
Soap: sodium stearate
C) Extreme pressure additive
Esters of phosphorous acid
D) Content of solid component
The solid content of sodium metasilicate relative to the total solid content of the lubricating coating layer: 80 percent of
The amount of solid component of the polyethylene wax relative to the amount of total solid component of the lubricating coating layer: 5 percent of
Chemical solution (2-3)
A) Binder component
Sodium metasilicate(SiO2/Na2Molar ratio of O: 2)
acrylic resin (monomer composition: acrylic acid 8%, methacrylic acid 52%, butyl acrylate 40%)
B) Lubricating composition
Organic high molecular compound: polyethylene wax (molecular weight 10000, average grain diameter 1.0 μm)
Solid lubricants: molybdenum disulfide (average particle size 2 μm)
Soap: sodium stearate
C) Extreme pressure additive
Esters of phosphorous acid
D) Content of solid component
The solid content of sodium metasilicate relative to the total solid content of the lubricating coating layer: 60 percent of
The amount of solid component of the polyethylene wax relative to the amount of total solid component of the lubricating coating layer: 30 percent of
(3) Size of crystal
The surface of the zinc phosphate-treated steel sheet was observed by SEM at an acceleration voltage of 5kV and a magnification of 500 times. The area ratio of the zinc phosphate crystals exposed on the surface was as follows: the image was converted into 2-valued image, and the area of the crystal portion was calculated. In addition, 4 or more crystals exposed on the surface were arbitrarily selected, and the lengths of the major axis and the minor axis were measured to calculate the average crystal size as the crystal size of zinc phosphate.
(4) Evaluation method
a-1) resistance to mold sticking
In order to simulate the multi-step plastic working under high surface pressure, as shown schematically in fig. 5, the side surface of the L-bend worked sample of the lubrication-treated steel sheet was subjected to multi-step ironing in the following steps, and the lubrication performance was evaluated. In this case, since the number of forming passes is 2 or less and multi-step forming cannot be performed when the surface of the steel sheet is occluded, a steel sheet in which no occlusion occurs 3 or more times is accepted. The cases where occlusion occurred 2 times or less were denoted as x, and the cases where occlusion did not occur 3 times or more were denoted as o.
a-2) step
Step (1) general rust preventive oil was allowed to adhere in an amount of 1.5g/m2Applied to both sides of the sample.
Step (2) was performed by setting a clearance between the punch and the die so that the thickness became-0.25 (the thickness reduction width became 0.15mm), and performing the first thinning process (L-type forming) on the sample.
And (3) repeating the step (2) of thinning the L-shaped sample until sticking occurs on the surface of the steel plate while further reducing the gap by-0.25 pitch, and determining the number of times of thinning when sticking occurs.
b-1) slip roll resistance
In order to simulate the roll transport resistance under high surface pressure, as shown schematically in fig. 6, the front and back surfaces of the steel sheet were sandwiched by circular beads, and the static friction coefficient was calculated from the load when the steel sheet was drawn. It was confirmed that: when the static friction coefficient is 0.09 or less, a force for feeding out the steel sheet cannot be applied, and it is difficult to perform threading on an actual production line, and when the static friction coefficient exceeds 0.20, a force required for feeding out the steel sheet becomes excessively large, and it is difficult to perform threading on an actual production line. Therefore, a steel sheet having a static friction coefficient of 0.10 or more and 0.20 or less is acceptable. The case where the static friction coefficient is out of the range is denoted by x, and the case where the static friction coefficient is within the range is denoted by o.
b-2) step
Step (1) general rust preventive oil was allowed to adhere in an amount of 1.5g/m2Applied to both sides of the sample.
And (2) pressing the two sides of the steel plate by using a circular edge pressing rib (R5) and clamping the steel plate by using a load of 1[ kN ], drawing the steel plate, and calculating the static friction coefficient during drawing.
[ Table 1]
Figure BDA0001827484530000211
(5) Evaluation results
Table 1 shows the evaluation results of the cases where the lubricating coating was formed on various zinc phosphate-treated steel sheets having different amounts of zinc phosphate crystals adhered thereto.
As shown in Table 1, samples Nos. 2 to 4, 6 to 10, 12 to 15, 17 to 18, and 20, which have preferable zinc phosphate coating layers and lubricating coating layers and satisfy the exposure area ratio of zinc phosphate crystals, exhibited sufficient performance to satisfy both the mold adhesion resistance and the slip roll resistance.
On the other hand, NO.1 and 19 in which the amount of adhesion of the zinc phosphate coating layer is 0 or less than 0 result in a low static friction coefficient and poor mold adhesion resistance and slip roll resistance. Even if the amount of adhesion of the zinc phosphate coating layer and the upper lubricating coating satisfy the preferable conditions, No.11, 24, 29, 30, and 31, in which the average particle diameter in the major axis direction or the average particle diameter in the minor axis direction of the zinc phosphate crystals are outside the range of the present invention, have a low static friction coefficient, resulting in poor slip resistance. No.5 in which zinc phosphate crystals were exposed to a large extent had a poor mold-sticking resistance because the lubricating coating itself was small. No.16 shows a small exposed area ratio of zinc phosphate crystals, and the static friction coefficient was not 0.10 or more.
FIGS. 7 to 10 are enlarged photographs of surface-treated steel strips of comparative examples and examples of the present invention. In the comparative example (No.30) shown in FIG. 7, the amount of the island-shaped zinc phosphate coating layer adhered was 1.9g/m2The major axis was 100 μm, the minor axis was 20 μm, and the amount of adhesion of the lubricating coating layer (chemical solution 2-1) was 3.3g/m2The exposed area ratio of zinc phosphate was 10%, and the amount of the island-like zinc phosphate coating layer adhered was 4.5g/m in the comparative example (No.31) shown in FIG. 82200 μm in major axis and 50 μm in minor axis, and the amount of the lubricating coating layer (chemical solution 2-1) adhered was 3.3g/m2The exposed area ratio of zinc phosphate was 24%. In the inventive example (No.14) shown in FIG. 9, the amount of the island-shaped zinc phosphate coating layer adhered was 8.0g/m2The major axis was 64 μm, the minor axis was 7 μm, and the amount of adhesion of the lubricating coating layer (chemical solution 2-1) was 3.7g/m2The exposed area ratio of zinc phosphate was 80%, and the amount of the island-like zinc phosphate coating layer adhered was 8.0g/m for the inventive example shown in FIG. 102The major axis was 31 μm, the minor axis was 4 μm, and the amount of adhesion of the lubricating coating layer (chemical solution 2-1) was 3.7g/m2The exposed area ratio of zinc phosphate was 60%.
In the present invention example, the temperature of the zinc phosphate treatment bath was locally raised by steam, and the amount of zinc phosphate crystals adhering was increased, and the zinc phosphate crystals were further needle-shaped (sharp shape), so that the bulkiness of the zinc phosphate crystals was improved, and the heads of the zinc phosphate crystals were more exposed from the lubricating coating layer. The zinc phosphate crystals themselves do not have slidability at low surface pressure, and therefore the coefficient of static friction becomes large. On the other hand, zinc phosphate crystals are crushed under high surface pressure, and the formability of zinc phosphate crystals, which is equivalent to conventional formability maintaining high surface pressure, is set to be anti-blocking property (simulation by L-shaped press forming), because the zinc phosphate crystals are crushed together with the lubricating coating layer to contribute to sliding property. In this way, both the slip resistance and the blocking resistance can be achieved.
While preferred embodiments of the present invention have been described in detail with reference to the drawings, the present invention is not limited to the above examples. It is to be noted that various modifications and alterations can be made within the scope of the technical idea described in the claims if the person having ordinary knowledge in the technical field to which the present invention belongs, and it is needless to say that these are also included in the scope of protection of the present invention.
Description of the reference numerals
1 pinch roll
2 mould
10 surface-treated steel strip
20 zinc phosphate treatment bath
21 heating device
22 stirrer
101 base steel plate
103 zinc phosphate coating layer
105 lubricating coating layer

Claims (10)

1. A surface-treated steel strip comprising:
a base steel plate;
a zinc phosphate coating layer formed in an island shape on the surface of the base steel sheet and formed of needle-like zinc phosphate crystals; and the combination of (a) and (b),
a lubricating coating layer that covers the surface of the base steel sheet and a part of the zinc phosphate coating layer and contains at least a lubricating component,
the exposed area ratio of the zinc phosphate crystals on the surface of the lubricating coating layer is 25-90%.
2. The surface-treated steel strip according to claim 1, wherein the zinc phosphate crystals have an average particle diameter in the major axis direction of 25 to 70 μm and an average particle diameter in the minor axis direction of 3 to 10 μm.
3. The surface-treated steel strip according to claim 1, wherein the zinc phosphate coating layer is attached in an amount of 1.5g/m per surface2～15.0g/m2。
4. The surface-treated steel strip according to claim 2, wherein the zinc phosphate coating layer is attached in an amount of 1.5g/m per surface2～15.0g/m2。
5. The surface-treated steel strip as claimed in any one of claims 1 to 4, wherein the amount of adhesion of the lubricating coating layer is 1.0g/m per surface2～12.0g/m2。
6. The surface-treated steel strip as claimed in any one of claims 1 to 4, wherein the lubricating coating layer comprises: SiO 22/M2O is an alkali metal silicate with a molar ratio of 2-5, wherein M is an alkali metal; and a polymer wax comprising at least one of a polyethylene wax and a polypropylene wax having an average particle diameter of 0.1 to 3.0 [ mu ] m,
the solid content of the alkali silicate is 60 to 90 mass% and the solid content of the polymer wax is 5 to 40 mass% based on the total solid content of the lubricating coating layer.
7. The surface-treated steel strip as claimed in claim 5, the lubricating coating layer comprising: SiO 22/M2O is an alkali metal silicate with a molar ratio of 2-5, wherein M is an alkali metal; and, fromA polymer wax comprising at least one of a polyethylene wax and a polypropylene wax having an average particle diameter of 0.1 to 3.0 μm,
the solid content of the alkali silicate is 60 to 90 mass% and the solid content of the polymer wax is 5 to 40 mass% based on the total solid content of the lubricating coating layer.
8. A method of manufacturing a surface treated steel strip comprising the steps of:
a hardening and tempering step, wherein the surface of the base steel plate is hardened and tempered by using a surface conditioner containing colloidal titanium;
a zinc phosphate coating layer forming step of growing needle-like crystals of zinc phosphate into island-like crystals on the surface of the base steel sheet subjected to surface hardening and tempering, and forming a zinc phosphate coating layer on the surface of the base steel sheet; and the combination of (a) and (b),
a lubricating coating layer forming step of applying a lubricating treatment agent containing at least a lubricating component in an amount of 1.0g/m per surface2～12.0g/m2The zinc phosphate coating layer is formed by coating the surfaces of the base steel plate and the zinc phosphate coating layer, so that the area ratio of the zinc phosphate crystals exposed on the surface of the lubricating coating layer is 25 to 90 percent.
9. The method of manufacturing a surface-treated steel strip according to claim 8, wherein in the zinc phosphate coating layer forming step, the base steel strip is heated.
10. The method for producing a surface-treated steel strip according to claim 9, wherein the base steel strip is heated by contacting with steam.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1177020A (en) * 1995-11-13 1998-03-25 株式会社神户制钢所 Lubricating steel plate with excellent chemical treatment properties
JP2005290552A (en) * 2004-03-08 2005-10-20 Nisshin Steel Co Ltd Chemical-conversion-coated steel sheet superior in corrosion resistance, and adhesiveness and adhesivity to paint film
CN101384750A (en) * 2006-02-20 2009-03-11 住友金属工业株式会社 Process for producing hot-dip galvanized steel sheet with zinc phosphate coat
JP2013104125A (en) * 2011-11-16 2013-05-30 Nippon Steel & Sumitomo Metal Corp High lubrication surface-treated steel sheet
CN105143514A (en) * 2013-02-08 2015-12-09 杰富意钢铁株式会社 Surface-treatment solution for zinc or zinc alloy coated steel sheet, zinc or zinc alloy coated steel sheet with surface-treatment film and method of producing same

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001015894A1 (en) * 1999-08-26 2001-03-08 Kawasaki Steel Corporation Surface treated steel sheet
DE60037645T2 (en) * 1999-09-17 2008-12-18 Jfe Steel Corp. SURFACE-TREATED STEEL PLATE AND METHOD FOR THE PRODUCTION THEREOF
TW200504243A (en) * 2003-07-08 2005-02-01 Nippon Paint Co Ltd Inorganic-organic composite-treated zinc-plated steel sheet
JP4344219B2 (en) * 2003-11-11 2009-10-14 新日本製鐵株式会社 Inorganic organic composite-treated zinc-coated steel sheet with excellent corrosion resistance after electrodeposition coating
JP4143019B2 (en) * 2003-11-11 2008-09-03 新日本製鐵株式会社 Inorganic organic composite treated zinc-based plated steel sheet
TW201040315A (en) * 2009-05-01 2010-11-16 China Steel Corp Surface treated steel plate and production method thereof
TWI395833B (en) * 2009-12-18 2013-05-11 China Steel Corp A steel sheet and its preparation method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1177020A (en) * 1995-11-13 1998-03-25 株式会社神户制钢所 Lubricating steel plate with excellent chemical treatment properties
JP2005290552A (en) * 2004-03-08 2005-10-20 Nisshin Steel Co Ltd Chemical-conversion-coated steel sheet superior in corrosion resistance, and adhesiveness and adhesivity to paint film
CN101384750A (en) * 2006-02-20 2009-03-11 住友金属工业株式会社 Process for producing hot-dip galvanized steel sheet with zinc phosphate coat
JP2013104125A (en) * 2011-11-16 2013-05-30 Nippon Steel & Sumitomo Metal Corp High lubrication surface-treated steel sheet
CN105143514A (en) * 2013-02-08 2015-12-09 杰富意钢铁株式会社 Surface-treatment solution for zinc or zinc alloy coated steel sheet, zinc or zinc alloy coated steel sheet with surface-treatment film and method of producing same

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