JP2001342548A - Stainless steel for civil and building construction excellent in fatigue property and adhesion property of coating film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stainless steel for civil and building construction, effectively improved in both fatigue property and adhesion property of coating film. SOLUTION: The stainless steel is characterized in that it is composed of Cr: 8 mass% over and 15 mass% below, C: 0.0025 mass% over and 0.03 mass% below, N:0.0025 mass% over and 0.03 mass% below, S: 0.03 mass% below, Mn: 0.5 mass% over and 3.0 mass% below, Al: 0.5 mass% below, P: 0.04 mass or below, Si: 0.1 mass% over and 2.0 mass% or below, and the balance Fe with inevitably impurities, and furthermore, the arithmetic mean roughness Ra of the surface is 0.2-50 μm and a strain generating the residual compressive stress of 0.01-50 MPa on the outer layer, is also introduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stainless steel for civil engineering and architectural structures which is excellent in fatigue characteristics and coating film adhesion.

[0002]

2. Description of the Related Art Conventionally, as materials for civil engineering and building structures,
Mainly, ordinary steel such as SS400, high-strength steel such as SM490, and materials obtained by painting or plating these steels have been used. However, in recent years, with the diversification of designs, utilization of various materials has begun to be considered.

[0003] Above all, stainless steel excellent in corrosion resistance and design is hardly required to maintain rust, and is therefore a very attractive material from the viewpoint of life cycle cost (LCC).

[0004] In particular, buildings constructed in coastal areas have problems that, in addition to having a short life, maintenance costs for controlling corrosion are increased, and welding is also required in promoting waterfront development. The role of stainless steel as a corrosion-resistant functional material for civil engineering and architectural structures with excellent resistance and corrosion resistance, especially initial rust resistance, is greatly expected.

[0005] Stainless steel is made of SUS4
Precipitation hardening represented by ferritic stainless steel represented by 30, martensitic stainless steel represented by SUS410 steel, austenitic stainless steel represented by SUS304, duplex stainless steel represented by SUS329 steel, and SUS630 Broadly classified into type stainless steel.

Among such various stainless steels, those which have been conventionally studied as materials for civil engineering and building structures are as follows:
It is an austenitic stainless steel with the highest use record including material strength, corrosion resistance, ease of welding, weld toughness and versatility.

Austenitic stainless steel has strength,
It has properties that sufficiently satisfy the properties required for civil engineering and building materials, such as corrosion resistance, fire resistance, and weld toughness.

However, this austenitic stainless steel 1) contains a large amount of alloying elements such as Ni and Cr.
It is much more expensive than ordinary steel, 2) causes stress corrosion cracking, and 3) has a larger coefficient of thermal expansion than ordinary steel, and has relatively low thermal conductivity, so it has a thermal effect during welding. Because it is easy to accumulate the strain due to the material and it is difficult to apply it to members requiring accuracy, etc., it is applied to general-purpose structural materials that used ordinary steel and painted or plated materials Is difficult and the range of application is limited.

For this reason, recently, as a substitute for plated or painted ordinary steel, low Cr having a Cr content of 15 mass% or less has been used.
The application of alloy steel containing steel and its coated steel sheet to steel materials for civil engineering and construction is being studied.

[0010] When stainless steel is used for civil engineering and building structural materials, fatigue characteristics and coating film adhesion are also important selection factors.

As a method for improving the coating adhesion of stainless steel, for example, Japanese Patent Application Laid-Open No. Hei 6-235100 proposes a method for producing stainless steel for resin coating in which anodic electrolysis is performed after bright annealing.

However, in stainless steel for civil engineering and architectural structures, no technique has been disclosed so far for effectively improving both fatigue characteristics and coating film adhesion.

[0013]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems in the prior art, and provides a stainless steel for civil engineering and building structures in which both fatigue characteristics and coating film adhesion are effectively improved. It is in.

[0014]

Means for Solving the Problems The inventors have found that it is useful to improve the surface of a stainless steel plate by shot blasting, brushing, dull roll or the like as means for achieving the above-mentioned object. By performing surface modification, the unevenness (roughness) and residual stress of the surface of the stainless steel plate or steel strip were changed in various ways. After properly setting the steel composition, both the surface roughness and the residual stress of the surface layer were changed. It has been found that, as long as it is properly controlled, both fatigue characteristics and coating film adhesion can be effectively improved without changing the heat treatment conditions, and the present invention has been completed.

That is, the gist of the present invention is as follows. 1. Cr: more than 8 mass%, less than 15 mass% C: more than 0.0025 mass%, less than 0.03 mass% N: more than 0.0025 mass%, less than 0.03 mass% S: less than 0.03 mass% Mn: more than 0.5 mass%, less than 3.0 mass% Al: Less than 0.5% by mass P: Less than 0.04% by mass Si: More than 0.1% by mass and less than 2.0% by mass, and the balance substantially has a composition of Fe and inevitable impurities, and the arithmetic mean roughness (Ra ) Is 0.2 to 50μ
m, and a stainless steel for civil engineering and building structures excellent in fatigue properties and coating film adhesion characterized by introducing a strain that generates a residual compressive stress of 0.01 to 50 MPa in the surface layer.

2. In the above item 1, the composition may further comprise a composition containing one or more selected from Cu: less than 3.0 mass%, Mo: less than 3.0 mass%, and Ni: less than 3.0 mass%. Stainless steel for civil engineering and building structures with excellent paint film adhesion.

3. In 1 or 2 above, one or more selected from Co: 0.01 mass% or more and less than 0.5 mass%, V: 0.01 mass% or more and less than 0.5 mass%, and W: 0.001 mass% or more and less than 0.05 mass% A stainless steel for civil engineering and building structures having excellent fatigue properties and coating film adhesion, characterized in that the composition contains two or more types.

4. In the above 1, 2, or 3, a stainless steel for civil engineering / building structure excellent in fatigue characteristics and coating film adhesion, characterized in that the composition further contains B: 0.0002 to 0.002 mass%.

5. In any one of the above items 1 to 4,
Further, the composition is characterized by containing one or more selected from Ti: less than 0.7 mass%, Nb: less than 0.7 mass%, Ta: less than 0.7 mass%, and Zr: less than 0.5 mass%. Stainless steel for civil engineering and building structures with excellent fatigue properties and coating adhesion.

[0020]

Next, the reason why the chemical composition of stainless steel according to the present invention is limited to the above-mentioned configuration will be described.

Cr: more than 8 mass% and less than 15 mass% Cr is an element effective for improving corrosion resistance. However, if its content is 8 mass% or less, it is difficult to secure sufficient corrosion resistance. Since Cr is a ferrite phase (α phase) stabilizing element,
Addition of 15 mass% or more not only causes a decrease in workability,
Since the stability of the austenite phase (γ phase) is reduced and a predetermined amount of martensite phase cannot be secured at the time of quenching, the strength of the welded portion decreases. Therefore, in the present invention, the Cr content is set to be more than 8 mass% and less than 15 mass%. In addition, the range of the Cr content that is particularly preferable for having both rust resistance, workability, and weldability is 10.0 to 13.5 mass%.

C and N: Both exceed 0.0025 mass%, and
Less than 03 mass% To improve the toughness and workability of the heat-affected zone and to prevent weld cracking, it is effective to reduce C and N as conventionally known. Further, C and N not only have a great effect on the hardness of the martensite phase, but also (Fe, Cr) ₂₃ C ₆ , (F
(Fe, Cr) ₇ C ₃ , (Fe, Cr) ₃ C, (Fe, Cr) ₂ N, (Fe, Cr) and other Fe-Cr-based carbides and nitrides are formed, and in the Cr-deficient phase Since the formation of carbides and the like becomes remarkable when each of the contents of C and N is 0.03 mass% or more, the contents of C and N are each 0.03 mass%.
Less than. However, in the steel composition range of the present invention,
Although the reduction of C and N contents is effective for improving the properties of welds, workability, corrosion resistance, etc., reducing the contents of C and N to 0.0025 mass% or less increases the refining load. Therefore, the contents of C and N are set to be more than 0.0025 mass% and less than 0.03 mass%, respectively. Note that C
And the content of N is more preferably 0.005 to 0.02 mass%.

S: less than 0.03 mass% S combines with Mn to form MnS, and serves as an initial rusting starting point. In addition, S is a harmful element that segregates at crystal grain boundaries and promotes grain boundary embrittlement, so that it is preferable to reduce S as much as possible.
In particular, when the S content is 0.03 mass% or more, the adverse effect becomes remarkable. Therefore, the S content is suppressed to less than 0.03 mass%, and more preferably 0.006 mass% or less.

Mn: more than 0.5 mass% and not more than 3.0 mass% Mn is an austenite phase (γ phase) stabilizing element, and effectively contributes to improvement of weld toughness by changing the structure of the heat affected zone to a martensite structure. Also, Mn is a useful element as a deoxidizing agent like Si, and if the Mn content is 0.5 mass% or less, a sufficient effect as a deoxidizing agent cannot be obtained.
The Mn content was set to exceed 0.5% by mass. On the other hand, an excessive addition exceeding 3.0 mass% causes a reduction in workability and a reduction in corrosion resistance due to the formation of MnS, so the Mn content was limited to 3.0 mass% or less. It is more preferable that the Mn content be in the range of 0.7 to 1.5 mass%.

Al: less than 0.5 mass% Al is not only a useful element as a deoxidizing agent, but also effectively contributes to improving the toughness of the welded portion.
If the content is 0.5 mass% or more, the amount of inclusions increases and mechanical properties deteriorate, so the Al content is limited to less than 0.5 mass%. In addition, Al does not need to be particularly contained in steel.

P: less than 0.04% by mass P not only reduces the hot workability, formability and toughness, but also is a harmful element to the corrosion resistance. Particularly, when the P content is 0.04% by mass or more. Since the effect becomes remarkable, the P content is controlled to be less than 0.04 mass%.
It is more preferable that the P content be 0.025 mass% or less.

Si: more than 0.1 mass% and less than 2.0 mass% Si is a useful element as a deoxidizing agent, but its content is
If the content is less than 0.1 mass%, a sufficient deoxidizing effect cannot be obtained.
Since excessive addition of 2.0 mass% or more causes reduction in toughness and workability, the Si content is set to exceed 0.1 mass% and less than 2.0 mass%. It is more preferable that the Si content be 0.3 to 0.5 mass%.

As described above, the essential components contained in the stainless steel according to the present invention have been described. In the present invention, other various elements described below can be appropriately contained.

Cu: less than 3.0 mass% Cu is an austenite stabilizing element, and is an element that improves corrosion resistance, forms an austenite phase, suppresses grain growth in the heat affected zone, and is effective in improving toughness. is there. However, when the Cu content is 3.0 mass% or more, the susceptibility to embrittlement, particularly hot cracking, tends to increase. Therefore, the Cu content is preferably set to a range of less than 3.0 mass%. It is more preferable that the lower limit of the Cu content is 0.1 mass% at which the effect of improving the corrosion resistance is remarkably exhibited, and the upper limit is 0.6 mass% at which the sensitivity to hot cracking tends to increase.

Mo: less than 3.0 mass% Mo is an element effective for improving the corrosion resistance like Cu. However, when the Mo content is 3.0 mass% or more, the stability of the austenite phase is reduced, and the toughness and workability tend to be reduced. Therefore, the Mo content is preferably set to a range of less than 3.0 mass%. . From the viewpoint of the balance between corrosion resistance and workability, it is more preferable that the Mo content be in the range of 0.1 to 0.5 mass%.

Ni: less than 3.0 mass% Ni is an element that improves ductility and toughness. It is particularly preferable to add Ni when it is necessary to improve the toughness of the heat affected zone. However, if the Ni content is 3.0 mass% or more, the material tends to be hardened and its effect tends to be reduced, so that the Ni content is preferably in the range of less than 3.0 mass%. If it is necessary to significantly improve the rust resistance improvement effect, the Ni content is 0.1 ma.
It is preferable that the content be ss% or more.

Co: 0.01 mass% or more, less than 0.5 mass%
V: 0.01 mass% or more, less than 0.5 mass%, W: 0.001 mass
% Or more and less than 0.05 mass% Co and W are used to improve the initial rust resistance of steel without adding a large amount of expensive Cr, Ni, Mo, etc., or reducing C and N extremely. It is an effective element and can be added as needed. The contents of Co and W are respectively
0.01mass%, 0.01mass%, at which the above-mentioned improvement effect becomes apparent
It is preferably 0.001 mass%. V and W
The content of each is 0.5mass% or more and 0.05mass%
% Or more, the hardening of the material tends to be remarkable due to the precipitation of carbides, so it is preferable to limit the content to less than 0.5 mass% and less than 0.05 mass%, respectively, and the Co content is 0.5 mass% or more. However, it is preferable to limit the amount to less than 0.5 mass% because of the possibility of hardening the steel. still,
More preferably, the Co content is 0.03-0.2 mass%, the content is 0.05-0.2 mass%, and the W content is 0.005-0.02 mass%.
mass%.

B: 0.0002 to 0.002 mass% B is an element effective for improving the hardenability of steel. However, if the B content is less than 0.0002 mass%, the above-mentioned improvement effect cannot be sufficiently obtained, and if the B content exceeds 0.002 mass%, the material tends to be hardened and the toughness and workability tend to be impaired. The content is preferably 0.0002 to 0.002 mass%. It is more preferable that the B content is 0.0005 to 0.001 mass%.

Ti: less than 0.7 mass%, Nb: less than 0.7 mass%, Ta: less than 0.7 mass%, Zr: less than 0.5 mass% Ti, Nb, Ta and Zr are all carbonitride forming elements and It suppresses grain boundary precipitation of Cr carbonitride during heat treatment and heat treatment, and effectively acts to improve corrosion resistance. Also, Ti is an element effective for improving hardenability. However, Ti,
Nb and Ta content is 0.7mass% or more, and Zr content is 0.5ma
If ss% or more, the material tends to harden,
Preferably, the contents of Ti, Nb and Ta are all less than 0.7 mass%, and the Zr content is less than 0.5 mass%. In addition, Ti, N
The preferred ranges of the contents of b, Ta and Zr are all 0.01 to 0.3.
mass%.

The balance Fe and unavoidable impurities The balance other than the above-described steel composition components is Fe and unavoidable impurities. As the inevitable impurities, for example, it is accepted that the O content is in a range of 0.010 mass% or less.

The main feature of the constitution of the present invention is that the arithmetic mean roughness Ra of the steel surface is set to 0.
The purpose is to introduce a strain corresponding to a residual compressive stress of 0.01 to 50 MPa into the steel surface layer in addition to 2 to 50 μm.

Arithmetic mean roughness Ra of the steel surface: 0.2 to 50 μm Since the arithmetic mean roughness Ra of the steel surface has a particularly large effect on coating film adhesion, it is set to 0.2 to 50 μm. That is,
If the arithmetic average roughness Ra of the steel surface is less than 0.2 μm, sufficient coating adhesion cannot be obtained, and if it exceeds 50 μm, the unevenness of the surface becomes severe and the adhesion deteriorates. At the same time, the color tone and unevenness of the painted surface become conspicuous. The arithmetic surface roughness Ra here is JI
It means the arithmetic average roughness Ra defined in SB0601.

Introducing a strain that causes a residual compressive stress of 0.01 to 50 MPa to the steel surface layer Introducing a strain that causes a residual compressive stress of 0.01 to 50 MPa to the steel surface layer is the most important feature in the structure of the present invention. is there.

[0039] The inventors of the present invention have studied to improve the fatigue characteristics, particularly the fatigue strength, and found that the thickness of the plate is 0.01 to 50 MPa in the thickness direction by using a brush, shot blast, dull roll, or the like.
It has been found that by introducing a strain corresponding to the residual compressive stress of steel into the steel surface layer, the fatigue strength is remarkably improved.
That is, the fatigue fracture occurs when a tensile stress is applied, and the stress concentration portion starts as a starting point.
By introducing a strain equivalent to the residual compressive stress of MPa,
They found that stress concentration was reduced and fatigue strength increased, and they succeeded in completing the present invention.
The reason for limiting the residual compressive stress to 0.01 to 50 MPa is as follows.
If the residual compressive stress is less than 0.01 MPa, the stress concentration cannot be sufficiently reduced, and the effect of increasing the fatigue strength will not be remarkable, and if the residual compressive stress is greater than 50 MPa, it will be extremely large. This is because the material hardens. Further, the “steel surface layer” here means a value measured from the plate surface by the X-ray diffraction method, and specifically, it is considered to be a layer having a thickness of about 200 μm including from the steel surface. . Note that the X-ray diffraction method uses a RINT1500 X-ray diffractometer manufactured by Rigaku Denki Co., Ltd., and uses CoKα radiation,
The measurement was performed by the θ-2θ method under the conditions of a voltage of 46 kV and a current of 150 mA.

FIG. 1 shows a fatigue test performed on a stainless steel sheet having a steel composition according to the present invention, and a cyclic stress (MP
a) is a diagram plotting the relationship between the number of repetitions (times) until fatigue fracture, that is, an example showing an SN diagram,
In FIG. 1, "●" indicates data for a stainless steel sheet in which a strain equivalent to a residual compressive stress of 0.80 MPa was introduced by performing shot blasting, and "○" indicates that shot blasting was not performed. The data is for a steel plate (residual compressive stress: 0.002 MPa).

As is clear from FIG. 1, the fatigue properties of the stainless steel sheet into which the residual compressive stress has been introduced are remarkably improved.

Next, an example of a preferred method for producing the stainless steel of the present invention will be described. First, molten steel adjusted to the above-mentioned steel component composition is smelted in a commonly known smelting furnace such as a converter or an electric furnace, and then subjected to a vacuum degassing method (RH method) and a VOD method.
It is preferable that the steel material is refined by a known refining method such as an AOD method, and then cast into a slab or the like by a continuous casting method or an ingot-making method.

Next, the steel material is heated and turned into a hot-rolled steel sheet by a hot rolling process. The heating temperature in the hot rolling step is not particularly limited, but if the heating temperature is too high, the crystal grains become coarse and the toughness and workability deteriorate, so the heating temperature is preferably 1300 ° C. or lower.

In the hot rolling step, it is sufficient that a hot-rolled steel sheet having a desired thickness can be obtained, and the conditions for the hot rolling are not particularly limited. It is preferable from the viewpoint of securing strength and toughness.

However, when workability, ductility, and good surface properties are required, the finishing temperature in hot rolling is preferably 820 ° C. or more and 1000 ° C. or less.

The winding temperature is preferably in the range of 500 to 800 ° C.

After the end of the hot rolling, it is preferable to perform hot-rolled sheet annealing for softening. This hot rolled sheet annealing is performed at an annealing temperature of 600 to 1100 ° C. and a holding time of 0.01 to 20 hours.
It is preferable from the viewpoint of not only softening but also improving workability and securing ductility.

In the case where a martensite structure is formed in the hot-rolled sheet, the temperature range of 600 to 730 ° C. after the hot-rolled sheet is annealed.
Slow cooling at a cooling rate of 50 ° C./h or less is more preferable from the viewpoint of softening.

Thereafter, the scale is removed by pickling or the like,
Further, if necessary, after performing alkali washing, degreasing, washing and drying, the surface of the steel is modified using a brush, shot blast or dull roll, etc., and the roughness of the steel surface and the strain introduced into the steel surface layer are adjusted appropriately. It is preferable to apply the coating after controlling the temperature. The coating is, for example, a baking coating at a temperature range of 180 to 300 ° C. for 15 seconds to 3 minutes. The baking coating includes, for example, a coating containing urethane-modified epoxy resin containing titanium oxide, a rust preventive pigment, etc. 3 μm
Paints containing about 30% of iron phosphide powder in a non-volatile content ratio.

[0050]

EXAMPLE A molten steel having the composition shown in Table 1 was smelted in a converter-secondary refining process and formed into a slab by a continuous casting method.
Re-heated to 30 ° C to make the rolling reduction of the final rough rolling 30 to 45%.
After rough pass rolling, final finishing temperature is 840 ~ 990 ℃
After a 7-pass finish rolling, a 4.2 mm hot-rolled steel sheet is formed. Then, the hot-rolled sheet is annealed and pickled in a normal process, and then the surface of the steel sheet is subjected to a surface modification treatment using shot blast or dull roll. In addition, stainless steel sheets were manufactured in which the surface roughness was changed variously and the residual compressive stress was changed variously in the thickness direction.

[0051]

[Table 1]

For each of the prepared stainless steel plates, the residual compressive stress on the plate surface was measured, and then the stylus method (JIS B 06
01), the surface roughness was measured, and a fatigue test was performed to measure the fatigue strength.

The measurement of the residual compressive stress was carried out by a general X-ray diffraction method (author BDCULLITY, translated by Gentaro Matsumura, Agne Co., Ltd., 1976, ninth edition, p. 435-458).
Line diffraction method (conditions: θ-2θ method, using CoKα ray, voltage 46k
V, current 150mA, RINT1500 X manufactured by Rigaku Corporation
Using a line diffractometer) from the plate surface. However, in this case, sufficient care must be taken in adjusting the sample. That is, when the X-ray diffraction method is used, the unevenness on the surface has a great effect on the reflection of X-rays, so that the unevenness on the surface must be removed. Careful attention was paid here, and the surface layer of the steel sheet was first mechanically fine emery paper (♯80
0 to 1200), and the surface layer was electrolytically polished with 5% perchloric acetic acid (10 ° C.) to remove distortion due to mechanical polishing, and then used for measurement.

The measurement of the surface roughness was carried out by a contact method according to JIS B 0601.

The measurement of the fatigue strength was performed according to JIS Z 2273. The fatigue strength measured here is
It means the fatigue strength for 10 ⁶ times.

In order to evaluate the coating adhesion of the various stainless steel plates, after washing with alkali and degreasing, they were washed with water and dried, and further subjected to a chromate treatment so that the Cr adhesion amount was 30 to 35 mg / m ² . Thereafter, a paint (trade name: Wellcolor P) further containing about 30% of iron phosphide powder having an average particle diameter of 3 μm in a nonvolatile content ratio in addition to a paint containing urethane-modified epoxy resin containing titanium oxide, rust preventive pigment, and the like. A coated steel sheet was manufactured by performing heat coating under a heating coating condition of 280 ° C. for 60 seconds so that the dry basis weight was 17.5 mg / m ² . Thereafter, each coated steel sheet was cross-cut on its surface, immersed in 5 mass% hydrochloric acid (28 ° C.) for 96 hours, washed with water and dried, and then subjected to a peeling test with cellophane tape. The coating film adhesion was evaluated by measuring the maximum width (mm) of the coating peeled off at the cross-cut portion and using the measured value. In the present invention, when the peeling width of the coating film was 5 mm or more, the coating film adhesion was rejected.

The residual stress (MPa) of the surface layer of the steel sheet, the surface roughness (μm) of the steel sheet, and the fatigue strength (MPa) measured by the methods described above
Table 2 shows the results of a) and coating film adhesion (peel width: mm). The numerical values of the residual stress in Table 2 mean that a positive value is a residual compressive stress and a negative value is a residual tensile stress.

[0058]

[Table 2]

From the results shown in Table 2, the invention examples were all
It can be seen that it has great fatigue strength and excellent coating film adhesion. In addition, when compared within the same steel No., it can be seen that the steel sheet having a larger residual compressive stress has a higher fatigue strength than the steel sheet having a smaller residual compressive stress. Incidentally, the same steel No. having a low fatigue strength was underlined in Table 2 to make a comparative example. Further, it can be seen that a steel sheet having a surface roughness of less than 0.2 μm has a large peeling width of the coating film and poor coating film adhesion.

[0060]

According to the present invention, after optimizing the steel composition, the arithmetic average roughness Ra of the steel sheet surface and the residual compressive stress of the steel sheet surface are optimized, whereby the fatigue characteristics and the coating film are improved. It has become possible to provide stainless steel for civil engineering and building structures with excellent adhesion.

[Brief description of the drawings]

FIG. 1 is an SN diagram when a residual compressive stress is introduced into a surface layer of a steel sheet and when it is not introduced.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Susumu Sato 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba

Claims (5)

[Claims] 1. Cr: more than 8 mass%, less than 15 mass% C: more than 0.0025 mass%, less than 0.03 mass% N: more than 0.0025 mass%, less than 0.03 mass% S: less than 0.03 mass% Mn: more than 0.5 mass%, 3.0 mass% or less Al: less than 0.5 mass% P: less than 0.04 mass% Si: contains more than 0.1 mass% and less than 2.0 mass%, with the balance being substantially the composition of Fe and unavoidable impurities, and arithmetic of the surface Average roughness (Ra) 0.2 to 50μ
m, and a stainless steel for civil engineering and building structures excellent in fatigue characteristics and coating film adhesion characterized by introducing a strain that causes a residual compressive stress of 0.01 to 50 MPa to the surface layer. 2. The composition according to claim 1, further comprising one or more selected from Cu: less than 3.0 mass%, Mo: less than 3.0 mass%, and Ni: less than 3.0 mass%. Stainless steel for civil engineering and building structures with excellent fatigue characteristics and excellent coating film adhesion. 3. The method according to claim 1, further comprising: Co: 0.01 mass% or more and less than 0.5 mass%, V: 0.01 mass% or more and less than 0.5 mass%, and W: 0.001 mass% or more and less than 0.05 mass%. A stainless steel for civil engineering and architectural use having excellent fatigue properties and coating film adhesion, characterized in that it has a composition containing one or more selected from the group consisting of: 4. The stainless steel for civil engineering and building structure according to claim 1, wherein the composition further contains B: 0.0002 to 0.002 mass%, and has excellent fatigue characteristics and coating film adhesion. . 5. The method according to claim 1, wherein:
Further, the composition is characterized by containing one or more selected from Ti: less than 0.7 mass%, Nb: less than 0.7 mass%, Ta: less than 0.7 mass%, and Zr: less than 0.5 mass%. Stainless steel for civil engineering and building structures with excellent fatigue properties and coating adhesion.