JPH06116749A - Steel sheet-made parts having contact part with fuel and manufacturing method thereof and steel sheet used therefor - Google Patents

Abstract

PURPOSE:To provide a steel sheet-made parts capable of forming a plating layer even on a defect part in a first plating layer, excellent in corrosion resistance, plastic workability and having contact part with fuel, etc., and its manufacturing method and the steel sheet used for it. CONSTITUTION:On at least one side of the surface of the steel sheet, the plating layer of one kind among Ni, Co and these metal base alloys is formed as a first plating layer. On this first plating layer, a single metal or alloy layer having m.p. lower than the first plating layer forming metal and these metal base alloys is formed as the second plating layer. By using the steel sheet formed with the two plating layers in such a way, the plastic working is executed and successively, by executing heating treatment so that the second layer melts and fluidizes, the parts in which the original steel surface is not exposed is manufactured. By this method, the exposed part of the original steel surface is eliminated and the parts having excellent corrosion resistance and plastic workability can be obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a fuel tank, a canister, a pressure regulator, a fuel filter, a strainer cup, a filler neck, a filler cap, a fuel pump, a delivery tube housing and a delivery tube cup. And a surface of a steel plate component (hereinafter simply referred to as “component”) having a contact portion with a fuel such as an electromagnetic fuel pump casing, which is in contact with a liquid or gaseous fuel, is plated with a metal, an alloy, or the like, and the surface thereof is plated. TECHNICAL FIELD The present invention relates to a component having excellent corrosion resistance capable of preventing corrosion from steel, a method for producing the same, and a steel sheet used for the same.

[0002]

2. Description of the Related Art Conventionally, a large number of the above-mentioned parts have been used in automobiles, for example, but at least the inner surface of a steel plate material is plated with Pb-Sn in order to improve the rust prevention of the contact surface with fuel. , Was common.

[0003]

However, in the case of highly corrosive fuels such as low grade gasoline, sour gasoline, alcohol and alcohol mixed fuel, light oil, heavy oil, P
The b-Sn plating layer has a problem that the pinholes are likely to be corroded by water present in alcohol, alcohol-mixed fuel, etc., organic acid generated by oxidation of gasoline, decomposition of alcohol, and the like. There was a problem that Pb of the layer was corroded.

When the parts are assembled and attached by welding, the Pb-Sn plating layer is melted by the welding heat, but the pinhole is remarkably generated in this welded portion because of poor wettability. There is also a problem that the corrosion resistance is particularly poor in this part.

The present invention solves the above problems, improves the corrosion resistance by covering not only the welded portion but also the pinhole portion existing in the plating layer, and further, even in the plastic working, the contact portion with the fuel is An object of the present invention is to provide a steel plate component having excellent corrosion resistance, a method for manufacturing the same, and a steel plate used therefor.

[0006]

Means for Solving the Problems As a result of repeated studies to solve the above problems and achieve the above objects, the present inventors have found that
A plating layer of Ni, Co, and one of these base alloys is formed, and a metal having a melting point lower than that of the plating layer forming metal or alloy, that is, S, is formed on the plating layer.
The present invention has been completed by finding that the object can be achieved by heat treatment using a steel sheet on which n, Sn-Zn, Ni-P, or another low melting point single metal or alloy is formed. That is, the first embodiment of the present invention has a first plating layer made of a plating layer of Ni, Co, and one of these base alloys on the inner surface of a steel sheet that has been plastically worked, and further, A steel plate component having a contact portion with a fuel or the like, which is formed by forming a single metal or an alloy having a lower melting point than the first plating layer as a second plating layer on the first plating layer,
In the second embodiment, at least one surface of the steel sheet is Ni, C
o, and one of these base alloys should be plated first
After forming as a plating layer, and forming a metal or an alloy having a melting point lower than those of the metal forming the first plating layer on the first plating layer as a second plating layer,
Plastic processing is performed so that the plated surface becomes the contact surface with fuel etc.,
It is a method of manufacturing a steel plate component having a contact portion with a fuel to be heat-treated, and a third embodiment is a steel plate used in the method of manufacturing a steel plate component having a contact portion with a fuel or the like on at least one surface thereof. Ni, Co, and one kind of plating layer of these base alloys are formed as a first plating layer, and a single metal or alloy having a melting point lower than that of the first plating layer is formed on the first plating layer as a second plating layer. A steel plate formed and formed as

The steel sheet used in the present invention may be a steel material used for producing parts having a portion that comes into contact with fuel for automobiles.

Next, the first plating layer has N, which has fewer pinholes than the Pb-Sn plating layer used in the prior art.
i, Co, and one of these base alloys are used,
The film is formed to a thickness of 0.5 to 10 μm by an electrical or chemical plating method that is usually performed as a plating method on a steel sheet. If the thickness of the first plating layer is less than 0.5 μm, the desired corrosion resistance is not exhibited, while if it exceeds 10 μm, cracks are likely to occur during plastic working, and it takes man-hours and is expensive, but the effect is different. There is no. The first
In order to enhance the adhesion of the plating layer to the steel sheet surface, a metal having a good affinity for the first plating layer and the base, such as Ni, Cu and their base alloys, may be formed as the base plating layer by a strike plating method or the like. . At this time, the thickness of the first plating layer is 0.5 including the thickness of the base plating layer.
The thickness is preferably in the range of 10 μm and the thickness of the undercoating layer alone is preferably 1 μm or less.

The second plating layer, which is a low melting point plating layer, has a melting point lower than that of the first plating layer forming metal and these base alloys, Sn, Sn-Zn, Sn-Ni, Ni-P, Ni-.
Formed by electrical or chemical plating method using one kind of single metal or alloy selected from B and Ni-Zn, and apply it to a film thickness of 0.5 to 10 μm on the first plating layer. Is preferred. The thickness of the second plating layer is 0.5
If it is less than μm, it cannot cover the defective parts of the first plating layer such as pinholes and cracks and the corrosion resistance is not exhibited. On the other hand, if it exceeds 10 μm, cracks, pools, and peeling occur, and it takes man-hours and is expensive. Has no difference in effect. Furthermore, the total thickness of the first plating layer and the second plating layer is set to 1 to 15
It is preferably in the range of μm. This has a film thickness of 1 μm
If it is less than 15 μm, it is difficult to exhibit corrosion resistance. On the other hand, if it exceeds 15 μm, there is no difference in effect despite the fact that cracks and peeling are likely to occur in the plating film during plastic working, which requires man-hours and is expensive.

The above-mentioned plastic working is carried out by press working such as drawing, bending, overhanging, caulking, curling and the like.

In the heat treatment step, the second plating layer is melted and fluidized to cover the defective portion of the first plating layer, and when welding is used for fixing, new defects caused by welding heat are generated. 600 to 1200 to cover the welded part and to remove the heat effect near the welded part.
It is preferable to perform the treatment at 5 ° C. for 5 seconds to 15 minutes, and if the temperature is less than 600 ° C., the second plating layer cannot be sufficiently melted and flowed to sufficiently cover the defective portion of the first plating layer.
If the temperature exceeds 0 ° C, the base material is thermally deteriorated due to the growth (coarsening) of crystal grains. Further, if the time is less than 5 seconds, the melting and flow of the second plating layer are insufficient, the defective portion of the first plating layer cannot be sufficiently covered, and the removal of the heat effect when using welding is also insufficient. On the other hand, if it exceeds 15 minutes, the base material is thermally deteriorated due to the growth (coarsening) of the crystal grains, and the productivity is reduced, which is uneconomical. In addition, at 800 to 1200 ° C, 1
More preferably, the heat treatment is performed for 0 seconds to 5 minutes.

That is, according to the present invention, at least one surface of a steel sheet is coated with a first film such as Ni plating having a predetermined thickness according to a conventional method.
The plating layer is applied, and on the first plating layer, for example,
A second plating layer such as a Sn plating layer having a predetermined thickness is formed, and then the steel plate plated in two layers in this manner is cut into a predetermined dimension and plastically worked so that the plating layer surface becomes a contact surface with fuel or the like. And, if necessary, the electric resistance welding method at the edge,
It is welded and fixed by a high-frequency welding method or the like, and is further heat-treated using an atmosphere furnace, a high-frequency heating furnace, or the like to manufacture a part having excellent corrosion resistance on the contact surface with fuel or the like.

[0013]

In general, in these manufacturing steps, pinholes remain in the first plating layer.
In the present invention, even if a pinhole or a crack due to plastic working is present in the first plating layer such as the Ni plating layer, it is formed on the surface side of the steel sheet that comes into contact with fuel etc. by the next heat treatment step. The second plating layer, such as an Sn plating layer having a lower melting point than the first plating layer, melts and flows, and acts to block them. Therefore, a low melting point plating layer which is the second plating layer is formed on the first plating layer such as the Ni plating layer on the contact surface of the component with the fuel, and the contact between the first plating layer and the second plating layer is formed. These two diffusion layers are formed in between, and the low melting point plating layer is melted and covers at least pinholes, cracks and the like. Therefore, the steel material is not exposed, and it protects against corrosion by protecting against moisture and organic acids contained in low grade gasoline, sour gasoline, alcohol and alcohol mixed fuel. Is something that can be done.

Although the above description has been made with respect to parts that come into contact with fuel, the present invention is not limited to this, and can be used in parts that come into contact with engine cooling water, parts that come into contact with compressed air, and parts that come into contact with oil. You can

[0015]

EXAMPLES Next, examples of the present invention will be described.

FIG. 1 is a partially cutaway side view showing a fuel tank according to an embodiment of the present invention, FIG. 2 is a sectional view of a canister housing according to another embodiment, and FIG. 3 is a view of a pressure regulator housing. 2 equivalent view, FIG. 4 is a half cut view of the fuel filter housing, and FIG.
2 of the fuel tank pipe flange, FIG. 6 is a view of the strainer cup corresponding to FIG. 2, and FIG. 7 is a view of the plunger type electromagnetic fuel pump casing corresponding to FIG. Example 1 A strip steel sheet having a thickness of 0.9 mm and a width of 1000 mm (material S
A Ni plating layer having a film thickness of 5 μm was formed as a first plating layer on one surface of PCE) by a conventional method. Then, a Ni-P plating layer as a second plating layer having a film thickness of 3 is formed on the Ni plating layer.
The total thickness of the first and second plating layers is 8 μm.
Formed.

The steel plate plated with these two layers is cut into a predetermined size, and the two upper and lower parts formed by bulging so that the plating layer surface becomes the inner surface are seam-welded in the shape of a hollow, and then heated at 900 ° C. for 90 seconds. It processed and manufactured the fuel tank 1 shown in FIG.

The bent corners 1a and seam welds 1b of the obtained fuel tank were cut, the outer surface and the cut surface were masked, and the four types of corrosion test solutions shown in Table 1 below were used for the tests shown in Table 1. After immersion for a period of time at room temperature, no abnormalities such as the formation of red rust were observed. Also, the first observation result
It was confirmed that a diffusion layer was present between the plating layer and the second plating layer.

[0019]

[Table 1] Example 2 A Ni plating layer having a thickness of 0.5 μ was formed as a first plating layer on one surface of a 0.7 mm-thick steel plate (material SPHC) according to a conventional method.
Then, a Sn plating layer was formed as a second plating layer to a film thickness of 0.5 μm, and the total film thickness of the first and second plating layers was set to 1.0 μm. After that, the product is cut into a predetermined size and formed into a cylindrical shape by bending so that the plating layer surface becomes the inner surface, after welding the joints, the end 2a is expanded by pressing and heat-treated at 800 ° C. for 30 seconds. Two
The canister housing 2 as shown in FIG.

When the outer surface and the end surface of the obtained canister housing were masked and immersed in the same corrosion test solution as in Example 1 at room temperature, the test solution No. 800 hours for Nos. 2 and 3, and No. 300 for 1 and 4
No abnormality such as red rust was observed even after 0 hour. As a result of observation, it was confirmed that a diffusion layer was present between the first plating layer and the second plating layer. Example 3 A 1.0 mm thick steel plate (material SPCD) was subjected to strike Ni plating by 0.3 μm on one side according to a conventional method, and then a Co plating layer was formed as a first plating layer to a film thickness of 5 μm.
Then, a Ni-B plating layer was formed as a second plating layer to a thickness of 0.
It was formed to a thickness of 5 μm, and the total thickness of the underlayer and the first and second plating layers was set to 5.8 μm. After that, cut it to the specified size,
Then, a hole is formed, deep drawing is performed so that the plating layer surface becomes the inner surface, and heat treatment is performed at 1130 ° C. for 450 seconds to braze the two nipples 3a and 3b with copper, and
Melt diffusion treatment was performed to form a pressure regulator housing 3 as shown in FIG.

When the outer surface, the end surface and the nipple of the obtained pressure regulator housing were masked and immersed in each corrosion test solution similar to that in Example 1 at room temperature,
No abnormalities such as red rust were observed at each time. As a result of observation, it was confirmed that a diffusion layer was present between the first plating layer and the second plating layer. Example 4 A 0.4 mm thick steel plate (material SPCD) was subjected to strike Cu plating on one side by a conventional method in a thickness of 0.5 μm, and then a Ni plating layer was formed to a thickness of 4 μm as a first plating layer.
Then, a Sn-Ni plating layer having a film thickness of 1 is formed as a second plating layer.
The thickness of the base layer and the first and second plating layers was 14.5 μm. After that, it is cut into a predetermined size and deep drawn so that the plating layer surface becomes the inner surface.
The housing 4 of the fuel filter as shown in FIG. 4 was formed by heating at 60 ° C. for 60 seconds.

When the outer surface and the end surface of the housing of the obtained fuel filter were masked and immersed in the same corrosion test solution as in Example 1 at room temperature, no abnormalities such as red rust were observed at each time. It was As a result of observation, it was confirmed that a diffusion layer was present between the first plating layer and the second plating layer. Example 5 A Co plating layer having a thickness of 0.5 was formed as a first plating layer on one surface of a steel plate (material: SPCC) having a thickness of 1.2 mm according to a conventional method.
Then, a Ni-B plating layer was formed as a second plating layer to a film thickness of 5 μm, and the total film thickness of the first and second plating layers was set to 5.5 μm. After that, it is cut into a predetermined size to make a hole, press-formed so that the plating layer surface becomes the inner surface, and heat-treated at 1200 ° C. for 240 seconds,
A fuel tank pipe flange 5 as shown in FIG. 5 was formed.

When the outer surface and the end surface of the obtained fuel tank pipe flange were masked and immersed in the same corrosion test solution as in Example 1 at room temperature, abnormalities such as red rust were observed at each time. There wasn't. As a result of observation, it was confirmed that a diffusion layer was present between the first plating layer and the second plating layer. Example 6 A Ni—Co plating layer was formed as a first plating layer to a thickness of 0.5 μm on both surfaces of a steel plate (material SPHC) having a thickness of 0.6 mm, and then Sn— was formed as a second plating layer.
The Zn plating layer was formed to a film thickness of 10 μm, and the total film thickness of the first and second plating layers was set to 10.5 μm. Then, the strainer cup 6 was formed by cutting into a predetermined size and press-working, burring the suction tube side 6a, and curling the mesh side 6b, and then heat-treating at 1000 ° C. for 120 seconds.

When the burring portion of the obtained strainer cup was masked and immersed in each corrosion test solution similar to that used in Example 1 at room temperature, no abnormality such as red rust was observed at each time. As a result of observation, it was confirmed that a diffusion layer was present between the first plating layer and the second plating layer. Example 7 An Ni—B plating layer as a first plating layer having a thickness of 3 μ was formed on one surface of a steel plate (material: SPCC) having a thickness of 0.5 mm according to a conventional method.
Then, a Sn—Ni plating layer was formed as a second plating layer to a film thickness of 2 μm, and the total film thickness of the first and second plating layers was set to 5 μm. After that, it is cut to a predetermined size, then perforated, cylindrically shaped so that the plating layer surface is the inner surface, welded, flanged, drawn, and processed at 1130 ° C for 360
3 nipples 7a, 7 by heat treatment for 2 seconds
While b and 7c were brazed with copper, melt diffusion treatment was performed to form a plunger type electromagnetic fuel pump casing 7 as shown in FIG.

When the outer surface, the end surface and the nipple of the obtained plunger type electromagnetic fuel pump casing were masked and immersed in the same corrosion test solution as in Example 1 at room temperature, red rust was generated at each time. No abnormality was observed. As a result of observation, it was confirmed that a diffusion layer was present between the first plating layer and the second plating layer. Example 8 A Co—Sn plating layer as a first plating layer having a film thickness of 10 μm was formed on one surface of a steel plate (material SPCC) having a thickness of 1.2 mm according to a conventional method, and then Ni—Z as a second plating layer.
The n plating layer was formed to a film thickness of 5 μm, and the total film thickness of the first and second plating layers was set to 15 μm. After that, it was cut into a predetermined size to make a hole, press-formed so that the plating layer surface became the inner surface, and heat-treated at 800 ° C. for 30 seconds to form a fuel tank pipe flange as shown in FIG.

When the outer surface and the end surface of the obtained fuel tank pipe flange were masked and immersed in the same corrosion test solutions as in Example 1 at room temperature, abnormalities such as red rust were observed at each time. There wasn't. As a result of observation, it was confirmed that a diffusion layer was present between the first plating layer and the second plating layer. Example 9 A Ni plating layer having a thickness of 8 μm was formed as a first plating layer on one surface of a steel plate (material SPCD) having a thickness of 1.0 mm according to a conventional method, and then a Sn—Ni plating layer was formed as a second plating layer. It was formed to a thickness of 0.5 μm, and the total thickness of the first and second plating layers was set to 8.5 μm. After that, it is cut to a predetermined size, then perforated, deep-drawn so that the plating layer surface becomes the inner surface, and heat-treated at 1130 ° C for 360 seconds to braze the two nipples and perform the melt diffusion treatment. Then, the pressure regulator housing as shown in FIG. 3 was formed.

When the outer surface, the end surface and the nipple of the obtained pressure regulator housing were masked and immersed in each corrosion test solution similar to that of Example 1 at room temperature,
No abnormalities such as red rust were observed at each time. As a result of observation, it was confirmed that a diffusion layer was present between the first plating layer and the second plating layer. Comparative Example 1 A strip steel sheet having a thickness of 0.9 mm and a width of 1000 mm (material S
A Ni plating layer with a thickness of 5 μm on one side of PCE) by a conventional method.
Formed.

This plated steel plate was cut into a predetermined size, and the upper and lower two parts formed by bulging so that the plated layer surface became the inner surface were seam-welded in the middle to manufacture a fuel tank as shown in FIG. .

When the overhanging curved corners and seam welds of the obtained fuel tank were cut, the outer surface and the cut surface were masked and immersed in each corrosion test solution similar to that of Example 1 at room temperature. At each time, abnormalities such as red rust were observed. Comparative Example 2 Strip-shaped steel sheet having a thickness of 0.9 mm and a width of 1000 mm (material S
A Ni plating layer with a thickness of 5 μm on one side of PCE) by a conventional method.
Formed.

The plated steel sheet is cut to a predetermined size, and the upper and lower two parts formed by bulging so that the plated layer surface becomes the inner surface are seam-welded in the shape of a hollow and 9 ° C. at 900 ° C.
A fuel tank as shown in FIG. 1 was manufactured by heat treatment for 0 seconds.

When the bent corners and seam welds of the obtained fuel tank were cut, the outer surface and the cut surface were masked, and immersed in each corrosion test solution as in Example 1 at room temperature. At each time, abnormalities such as red rust were observed. Comparative Example 3 A Pb—Sn plating layer having a thickness of 6 μm was formed on one surface of a steel plate (material SPCD) having a thickness of 0.4 mm by a conventional method. After that, it was cut into a predetermined size and deep-drawn so that the plated layer surface became the inner surface to form a fuel filter housing as shown in FIG.

When the outer surface and the end surface of the housing of the obtained fuel filter were masked and immersed in the same corrosion test solution as in Example 1 at room temperature, abnormalities such as red rust were observed at each time. . Comparative Example 4 After forming a Co—Sn plating layer with a thickness of 5 μm on one surface of a steel plate (material SPCC) having a thickness of 1.2 mm by a conventional method,
A Ni-B plating layer was formed on the plating layer to a film thickness of 15 μm, and the total film thickness of the two plating layers was set to 20 μm. After that, it was cut into a predetermined size to make a hole, press-formed so that the plating layer surface became the inner surface, and heat-treated at 1000 ° C. for 300 seconds to form a fuel tank pipe flange as shown in FIG.

When the outer surface and the end surface of the obtained fuel tank pipe flange were masked and immersed in the same corrosion test solution as in Example 1 at room temperature, abnormalities such as red rust were observed at each time. It was Comparative Example 5 A Ni plating layer having a thickness of 0.2 μm was formed on one surface of a steel plate (material SPHC) having a thickness of 0.7 mm by a conventional method, and then an Sn plating layer having a thickness of 15 μm was formed on this layer. The total film thickness of the two plating layers was 15.2 μm. After that, it is cut into a predetermined size and is bent into a cylindrical shape so that the plated surface becomes the inner surface, the seams are welded, the ends are expanded by pressing, and heat treatment is performed at 850 ° C. for 30 seconds. The canister housing shown in FIG.

When the outer surface and the end surface of the housing of the obtained canister were masked and immersed in the same corrosion test solutions as in Example 1 at room temperature, abnormalities such as red rust were observed at each time. . Comparative Example 6 A Ni plating layer having a film thickness of 15 μm was formed on one surface of a steel plate (material SPCD) having a thickness of 1.0 mm by a conventional method, and then a Ni—P plating layer having a film thickness of 15 μm was formed on this layer. The total film thickness of the two plating layers was 30 μm. After that, it is cut to a predetermined size, then perforated, deep-drawn so that the plating layer surface becomes the inner surface, and heat-treated at 1130 ° C for 450 seconds to braze the two nipples together with a melt diffusion treatment. Then, a pressure regulator housing as shown in FIG. 3 was formed.

When the outer surface, the end surface and the nipple of the obtained pressure regulator housing were masked and immersed in the same corrosion test solution as in Example 1 at room temperature,
Abnormalities such as red rust were observed at each time.

In the above embodiment, the parts that come into contact with fuel have been described, but the present invention is not limited to this, and parts that come into contact with engine cooling water such as a thermostat and a mechanical seal housing of a water pump, a reservoir tank. It can also be used for parts that come into contact with compressed air, such as oil and air dryer housings, and parts that come into contact with oil, such as oil filter cartridges and oil strainer caps.

[0037]

EFFECTS OF THE INVENTION The present invention has a two-layer structure including a first plating layer and a second plating layer having a lower melting point than the metal of the first plating layer on the inner surface of a steel plate component having a contact portion with fuel. A plating layer is formed and the second plating layer is heat-treated so that it melts and flows, eliminating cracks, pinholes, pools, peeling, etc., and having excellent corrosion resistance and plastic workability. It has an excellent effect that can be obtained.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing a fuel tank according to an embodiment of the present invention.

FIG. 2 is a sectional view of a canister housing according to another embodiment.

[Fig. 3] Fig. 2 of the pressure regulator housing
FIG.

FIG. 4 is a view corresponding to FIG. 2 showing the fuel filter housing in half cut.

FIG. 5 is a view corresponding to FIG. 2 of a pipe flange for a fuel tank.

FIG. 6 is a view corresponding to FIG. 2 of the strainer cup.

FIG. 7 is a diagram of a plunger type electromagnetic fuel pump casing.
FIG.

[Explanation of symbols]

 1 Fuel Tank 1a Curved Corner 1b Seam Weld 2 Canister Housing 2a End 3 Pressure Regulator Housing 3a Nipple 3b Nipple 4 Fuel Filter Housing 5 Fuel Tank Pipe Flange 6 Strainer Cup 6a Suction Tuner Side 6b Mesh side 7 Plunger type electromagnetic fuel pump casing 7a Nipple 7b Nipple 7c Nipple

Claims (10)

[Claims] 1. Ni, C on the inner surface of a steel sheet that has been plastically worked
o, and a first plating layer consisting of one kind of a plating layer of these base alloys, and a second metal plating layer having a melting point lower than that of the first plating layer on the first plating layer. A steel plate component having a contact portion with a fuel, characterized in that 2. A steel plate component having a fuel contact portion according to claim 1, further comprising a diffusion layer between the first plating layer and the second plating layer. 3. The second plating layer formed on the first plating layer comprises Sn, Sn—Zn, Sn—Ni, Ni—P,
A steel plate component having a contact portion with the fuel according to claim 1 or 2, wherein the component is made of one of Ni-B and Ni-Zn. 4. A base plating layer is further interposed between the inner surface and the first plating layer.
A steel plate component having a contact portion with the fuel according to any one of 1. 5. A steel sheet having at least one surface coated with Ni, Co,
And a metal for forming one kind of plating layer among these base alloys as a first plating layer and forming the first plating layer on the first plating layer, or a single metal or an alloy having a lower melting point than these base alloys. A method for producing a steel plate component having a contact portion with a fuel, which comprises forming a second plated layer, plastically working the plated layer surface to be a contact surface with a fuel, and then heat-treating. 6. Sn, Sn—Z on the first plating layer
6. The fuel contact portion according to claim 5, wherein a plating layer made of one of n, Sn-Ni, Ni-P, Ni-B, and Ni-Zn is formed as the second plating layer. Manufacturing method of steel plate parts. 7. A steel plate having a fuel contact portion according to claim 5 or 6, wherein a base plating layer is previously formed on said one surface before forming said first plating layer. Manufacturing method of parts. 7. A steel sheet used in the method for producing a steel sheet component having a fuel contact portion according to claim 5, wherein at least one surface thereof is coated with Ni, Co, and a plating layer of one of these base alloys. A steel plate formed as a first plating layer, and a single metal or an alloy having a lower melting point than the first plating layer is formed as a second plating layer on the first plating layer. 8. The steel sheet used in the method for producing a steel sheet-made component having a contact portion with a fuel according to claim 7, further comprising a diffusion layer between the first plating layer and the second plating layer. 9. The second plating layer is Sn, Sn-Z.
9. A method for manufacturing a steel plate component having a contact portion with a fuel according to claim 7 or 8, characterized in that it is made of one of n, Sn-Ni, Ni-P, Ni-B, and Ni-Zn. steel sheet. 10. A steel plate component having a fuel contact portion according to claim 7, further comprising a base plating layer interposed between the one surface and the first plating layer. Steel plate used for the method.