CN103392023A - Structural steel exhibiting superior weather resistance - Google Patents
Structural steel exhibiting superior weather resistance Download PDFInfo
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- C22C38/00—Ferrous alloys, e.g. steel alloys
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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Abstract
Provided is a low-cost structural steel exhibiting superior weather resistance. Specifically, a structural steel containing, in mass%: 0.1 - 1.00% inclusive of Cu; at least 0.10 - less than 0.6% of Ni; 0.05 - 1.00% inclusive of W; and further containing either or both of 0.005 - 0.200% inclusive of Nb and 0.005 - 0.200% inclusive of Sn. R value = 2.0 mass%. R value = (R1 value + R2 value) 0.5, R1 value = [Cu] 0.2 + [Ni] 3 + [W] 4 + [Nb] 20 + [Sn] 8.5, R2 value = (Log 1.5([W]2 + 0.002) + 16) ((Log2([Nb] 0.1 + 0.001) + 10) + (Log2([Sn] 0.1 + 0.001) + 10) 0.75) 0.5 (whereby [M] represents the content of the element M (mass%), and if none is present, [M] is 0).
Description
Technical field
The present invention relates generally to the steel structure (Steel Structures) in outdoor application such as bridge (Bridge), particularly is suitable as the steel that require the member of weathering resistance (atmospheric corrosion resistance) under near the environment of (coastal environment) contour air-borne salt (air-borne salt) seashore.
Background technology
All the time, use atmospheric corrosion resistant steel (weathering steel) in the steel structures in outdoor application such as bridge.Atmospheric corrosion resistant steel is that high rusty scale (rust layer) covering surfaces of protectiveness that is enriched with the alloying elements such as Cu, P, Cr, Ni in being exposed to the environment of atmosphere (atmospheric environment) by use makes the significantly reduced steel of corrosion speed (corrosion rate).Known: as to utilize its good weathering resistance, use the bridge of atmospheric corrosion resistant steel usually can tolerate the use of decades under the state of non-application (paintless).
But; known: as to wait near seashore in the many environment of air-borne salt amount (amount of air-borne salt); be difficult to generate the high rusty scale of above-mentioned protectiveness; thereby be difficult to obtain practical weathering resistance (hereinafter, the air-borne salt amount is the value of the mensuration of the method by JIS Z2382).
According to non-patent literature 1, (the JIS G3114: in the air-borne salt amount, be only welded construction weathering resistance hot-strip) 0.05mgNaCl/dm of atmospheric corrosion resistant steel in the past
2/ day (hereinafter, uses mdd representation unit (mgNaCl/dm sometimes
2/ day)) following zone can realize that non-application uses.Therefore, wait near seashore in the many environment of air-borne salt amount, to common iron (JIS G3106: Rolled Steel For Welded Structure) implement to use after the anti-corrosive treatment such as application.Need to prove, dm represents decimetre (decimeter).
For application (coating),, along with the time process, film (coating film) occurs deteriorated, thereby needs regular repairing (maintenance and repair).And, also to add the degree of difficulty of the soaring of labour cost (labor cost), application again (recoating).For this reason, at present requirement can be in the situation that the steel that non-application is used, and to can be in the situation that the expectation of the steel that non-application is used is high.
For this present situation, in recent years, as in the situation that near the steel that can use in non-application in contour air-borne salt environment seashore have been developed the steel that contain various alloying elements, particularly contain a large amount of Ni.
For example, in patent documentation 1, disclose and be added with as the Cu of the element that improves weathering resistance and the high-weatherability steel of the Ni more than 1 quality %.
In addition, in patent documentation 2, disclose and be added with the above Ni of 1 quality % and the good steel of weathering resistance of Mo.
In addition, in patent documentation 3, the good steel of weathering resistance that also are added with Cu, Ti except Ni are disclosed.
In addition, in patent documentation 4, the steel for welded structures material that contains a large amount of Ni and contain Cu, Mo, Sn, Sb and P etc. is disclosed.
On the other hand, although do not mention near the weathering resistance in contour air-borne salt environment seashore, but as the ballast tank (ballast tank) of boats and ships etc. uses in the harsh corrosive environment (corrosion environment) that the spray of seawater directly spatters corrosion-resistant steel, the corrosion-resistant steel material for ship and vessel that contains W and Cr and contain Sb, Sn and Ni etc. is disclosed in patent documentation 5.
The prior art document
Patent documentation
Patent documentation 1: No. 3785271 communique of Japanese Patent (Japanese kokai publication hei 11-172370 communique)
Patent documentation 2: No. 3846218 communique of Japanese Patent (TOHKEMY 2002-309340 communique)
Patent documentation 3: No. 3568760 communique of Japanese Patent (Japanese kokai publication hei 11-71632 communique)
Patent documentation 4: Japanese kokai publication hei 10-251797 communique
Patent documentation 5: TOHKEMY 2007-254881 communique
Non-patent literature
Non-patent literature 1: " the Bridge beam へ ying of weathering resistance Steel material is accused Books (the joint research report relevant with the application of weathering resistance steel in bridge) (XX) with To Seki The Ru joint research Reported ", No. 88, in March, 1993, construction province building institute, (company) steel social hall, (company) Japanese bridge are built association
Summary of the invention
Invent problem to be solved
But, while increasing the content of Ni as patent documentation 1,2, have the problem that causes the price increase of steel due to the cost of alloy rising.
In addition, in patent documentation 3, due to take Ti as essential element, therefore a large amount of while adding Ti, toughness is deteriorated sometimes.
In addition,, for as increasing the content of Ni patent documentation 4 and containing for the steel of Cu, Mo, Sn, Sb and P etc., because rising, cost of alloy causes the price increase of steel, and because the content of P is high, so weldability reduces.
In addition, in patent documentation 5, disclosed steel are different due to purposes, so the environment that steel expose is also significantly different, result, and desired corrosion resistance nature is different, does not address near the weathering resistance in contour air-borne salt environment seashore.
The present invention is in view of such situation, even its purpose is to provide cost low and in the air-borne salt amount, be also good structural steel of weathering resistance in the environment of approximately 0.4mdd.
Be used for the method for dealing with problems
In the present invention,, in order addressing the above problem, from the viewpoint of the weathering resistance high air-borne salt environment, the one-tenth of steel to be grouped into and to conduct in-depth research.Found that,, by the compound W of containing and Sn and/or Nb in the base steel containing Cu, Ni, can improve the weathering resistance of steel in high air-borne salt environment.
The steel plate thickness reduction (84 days) that known corrosion in drying and watering cycle corrosion test described later (wet and dry cyclic corrosion test) causes be that the steel plate thickness reduction that causes of the corrosion while exposing 84 days in the actual environment of approximately 0.4mdd is equal in the air-borne salt amount.Therefore, in the present invention, carrying out drying and watering cycle corrosion test described later is the method for the weathering resistance in the environment of approximately 0.4mdd as estimating in the air-borne salt amount.In addition, steel grade No.18 shown in the known table 1 described later that contains in a large number Ni can use in the air-borne salt amount is the environment of approximately 0.4mdd all the time, the average thickness of slab reduction of this steel grade in drying and watering cycle corrosion test described later is 14.0 μ m, therefore in the present invention, whether the evaluation of various steel reaches below 14.0 μ m as benchmark take the average thickness of slab reduction in drying and watering cycle corrosion test described later.
Result, the steel of the steel of the compound W of containing and Nb or the compound W of containing and Sn and weather resisteant steel, ordinary steel in the past, use the weather resisteant steel that the combination of other elements obtains to compare, value based on the steel plate thickness reduction of corrosion test is little, have the good tendency of weathering resistance, in addition, if be the composition after the component content in further restriction, adjusting steel, even, in the situation that with the many steel grade of Ni content, compare, also can obtain the better result of weathering resistance.
, even Ni content also demonstrates the reason of good weathering resistance less like this, be presumed as follows.
That is, Cu, Ni make the rusty scale densification, prevent from promoting the chloride ion of the factor to see through rusty scale and arrive iron-based as corrosion.W near interface and Fe at rusty scale and iron-based in anode portion forms composite oxides, suppresses anodic reaction.In addition, by the formal distribution with the W acid ion, in rusty scale, show the cation selective perviousness, prevent from promoting the chloride ion of the factor to see through rusty scale and arrive iron-based as corrosion.Nb is enriched in the near interface of rusty scale and iron-based in anode portion, suppress anodic reaction, cathodic reaction.Sn and Nb similarly are enriched in the near interface of rusty scale and iron-based in anode portion, suppress anodic reaction, cathodic reaction.But these effects are containing separately sometimes insufficiently, utilize the effect that multiplies each other based on the compound Cu of containing, Ni, W and Nb and/or Sn, and the corrosion-suppressing effect of Cu, Ni, W, Nb, Sn significantly improves.As a result, with the steel grade that contains separately Ni with high-content, compare, obtain the better result of weathering resistance.
Based on this discovery, the inventor further conducts in-depth research the impact that weathering resistance produces with regard to these elements, and has found the weathering resistance index R value shown in following.And find,, by so that the mode that this R value reaches more than 2.0 is regulated Cu, Ni, W, Nb, the Sn component content in steel, can access the good steel of excellent weather resistance and hard.
R value 〉=2.0 quality %
Wherein, R value=(R1 value+R2 value)
0.5
R1 value=[Cu] * 0.2+[Ni] * 3+[W] * 4+[Nb] * 20+[Sn] * 8.5
R2 value=(Log
1.5([W]
2+ 0.002)+16) * ((Log
2([Nb] * 0.1+0.001)+10)+(Log
2([Sn] * 0.1+0.001)+10) * 0.75) * 0.5,
In addition, above-mentioned in, [M] expression element M content (quality %), be made as 0 while not containing element M.
Need to prove, the R1 value is to estimate that from above-mentioned various tests etc. each composition gives separately the effect that weathering resistance improves, and semiempirical infer and the value that makes.In addition, the R2 value is to estimate the value of the effect that multiplies each other of each composition., about the effect that multiplies each other,, owing to observing saturated gradually tendency with respect to addition, therefore consider to represent with logarithmic function, and constant is set, is made on semiempirical ground.About the raising effect to weathering resistance, be thought of as these independent effects and multiply each other the effect sum, thus the formula of induced representation R value of the present invention.
The present invention is based on above discovery and complete, its purport is as described below.
[1] the good structural steel of a kind of weathering resistance, it is characterized in that, in quality %, more than containing C:0.020% and lower than 0.140%, more than Si:0.05% and below 2.00%, more than Mn:0.20% and below 2.00%, more than P:0.005% and below 0.030%, more than S:0.0001% and below 0.0200%, more than Al:0.001% and below 0.100%, more than Cu:0.10% and below 1.00%, more than Ni:0.10% and lower than 0.65%, more than W:0.05% and below 1.00%, and more than containing Nb:0.005% and below 0.200%, Sn:0.005% is above and 0.200% with lower one or both, surplus consists of iron and inevitable impurity, and meet following formula (1):
R value 〉=2.0 quality % ... formula (1)
Wherein, R value=(R1 value+R2 value)
0.5
R1 value=[Cu] * 0.2+[Ni] * 3+[W] * 4+[Nb] * 20+[Sn] * 8.5
R2 value=(Log
1.5([W]
2+ 0.002)+16) * ((Log
2([Nb] * 0.1+0.001)+10)+(Log
2([Sn] * 0.1+0.001)+10) * 0.75) * 0.5,
In addition, above-mentioned in, [M] expression element M content (quality %), be made as 0 while not containing element M.
[2], as the good structural steel of above-mentioned [1] described weathering resistance, it is characterized in that,, in quality %, also contain Cr: over 0.1% and below 1.0%.
[3] as above-mentioned [1] or the good structural steel of [2] described weathering resistance, it is characterized in that, in quality %, also contain be selected from that Co:0.01% is above and 1.00% following, Mo:0.005% is above and 1.000% following, Sb:0.005% is above and 0.200% following, REM:0.0001% is above and 0.1000% with lower more than one.
[4] as the good structural steel of the described weathering resistance of any one in above-mentioned [1]～[3], it is characterized in that, in quality %, also contain be selected from that Ti:0.005% is above and 0.200% following, V:0.005% is above and 0.200% following, Zr:0.005% is above and 0.200% following, B:0.0001% is above and 0.0050% following, Mg:0.0001% is above and 0.0100% with lower more than one.
Need to prove, in this manual, the % of the composition of expression steel is all quality %.In addition, in the present invention, " structural steel that weathering resistance is good " refers to meet in practical in can the high air-borne salt environment below 0.4mdd the structural steel of the high-weatherability of applying.
The invention effect
, according to the present invention, can access the structural steel that cost is low and weathering resistance is good.
In structural steel of the present invention, contain improving the effective element of weathering resistance by compound, thereby can not contain in a large number the expensive element realization low costs such as Ni, can have practical weldability, and can wait near seashore in environment more than the air-borne salt amount and have good weathering resistance.Particularly in the air-borne salt amount, surpass in the high air-borne salt environment of 0.05mdd and have significant effect.But the upper limit expectation of air-borne salt amount is for below 0.4mdd.
Description of drawings
Fig. 1 means the condition of corrosion test and the schematic diagram of circulation.
Embodiment
Below describe the present invention in detail.
More than C:0.020% and lower than 0.140%
C is the element that makes the intensity raising of structural steel, and the intensity in order to ensure regulation, need to contain more than 0.020%.On the other hand, if be more than 0.140%, weldability and toughness are deteriorated.Therefore, C content is set as more than 0.020% and lower than 0.140%.Be preferably more than 0.060% and below 0.100%.
More than Si:0.05% and below 2.00%
Si is as the reductor in when steel-making, and improves and guarantee the element of the intensity of stipulating as the intensity that is used for making structural steel, need to contain more than 0.05%.On the other hand, surpass 2.00% and excessive containing sometimes, toughness and weldability are significantly deteriorated.Therefore, Si content is set as more than 0.05% and below 2.00%.Be preferably more than 0.10% and below 0.80%.
More than Mn:0.20% and below 2.00%
Mn is the element that makes the intensity raising of structural steel, and the intensity in order to ensure regulation, need to contain more than 0.20%.On the other hand, surpass 2.00% and excessive containing sometimes, toughness and weldability are deteriorated.Therefore, Mn content is set as more than 0.20% and below 2.00%.Be preferably more than 0.20% and below 1.50%.
More than P:0.005% and below 0.030%
P is the element that makes the weathering resistance raising of structural steel., in order to obtain this effect, need to contain more than 0.005%.On the other hand, when content surpassed 0.030%, weldability was deteriorated.Therefore, P content is set as more than 0.005% and below 0.030%.Be preferably more than 0.005% and below 0.025%.
More than S:0.0001% and below 0.0200%
When S content surpassed 0.0200%, weldability and toughness were deteriorated.On the other hand, content is reduced to lower than 0.0001% the time, production cost increases.Therefore, S content is set as more than 0.0001% and below 0.0200%.Be preferably more than 0.0003% and below 0.0050%.
More than Al:0.001% and below 0.100%
The necessary element of deoxidation when Al is steel-making., in order to obtain this effect,, as Al content, need to contain more than 0.001%.On the other hand, while surpassing 0.100%, weldability is caused detrimentally affect.Therefore, Al content is set as more than 0.001% and below 0.100%.Be preferably more than 0.010% and below 0.050%.Need to prove,, about Al content, measure acid-soluble Al.
More than Cu:0.10% and below 1.00%
Thereby having by making the miniaturization of rust grain form fine and close rusty scale, Cu makes the effect of the weathering resistance raising of structural steel.This effect is 0.10% can obtain when above at content.On the other hand, while surpassing 1.00%, can cause following the Cu addition to increase and the cost rising of generation.Therefore, Cu content is set as more than 0.10% and below 1.00%.Be preferably more than 0.20% and below 0.50%.
Need to prove, patent documentation 5 relates to corrosion-resistant steel material for ship and vessel.The life-span that the protection against corrosion of the ballast tank of boats and ships is filmed (being generally speaking 10 years) is half of the life-span of boats and ships (20 years), kept erosion resistance by carrying out Repair Coatings in remaining 10 years, consider from such present situation, the purpose of patent documentation 5 described corrosion-resistant steel material for ship and vessel is, directly be splashed at seawater or its spray under the harsh corrosive environment on the ballast tank etc. of boats and ships, in the situation that be not subjected to the condition of surface of steel to affect the good erosion resistance of performance, can extend until time of Repair Coatings and then reduce the Repair Coatings operation.On the other hand, structural steel of the present invention is applied to the steel structure in outdoor application such as bridge, its purpose is, in the situation that non-application can be near seashore etc. is approximately used in the high air-borne salt environment of 0.4mdd, compare with the described steel of patent documentation 5, use the environment of steel and purpose significantly different.Therefore, for the described steel of patent documentation 5, do not need to contain Cu, but for the present invention, thereby need to contain Cu, form fine and close rusty scale the weather resisteant of steel is improved.Therefore, as mentioned above, in the present invention, contain the Cu more than 0.10%.
More than Ni:0.10% and lower than 0.65%
Thereby having by making the miniaturization of rust grain form fine and close rusty scale, Ni makes the effect of the weathering resistance raising of structural steel., in order fully to obtain this effect, need to contain more than 0.10%.On the other hand, Ni is 0.65% when above, can cause following the Ni consumption to increase and the cost that produces rises.Therefore, Ni content is set as more than 0.10% and lower than 0.65%.Be preferably more than 0.15% and below 0.50%.
More than W:0.05% and below 1.00%, more than Nb:0.005% and below 0.200% and/or more than Sn:0.005% and below 0.200%
W is important condition in the present invention, by there is simultaneously, has the effect that the weathering resistance of steel in high air-borne salt environment significantly improved with Nb and/or Sn.In addition, follow the anodic reaction of steel, stripping WO
4 2-And with WO
4 2-Formal distribution in rusty scale, the electrostatic means of using thus prevents from promoting the chloride ion of the factor see through rusty scale and arrive iron-based as corrosion.In addition, contain the compound precipitation of W at steel surface, suppress thus the anodic reaction of steel.In order fully to obtain these effects, W need to contain more than 0.05%.On the other hand, while surpassing 1.00%, can cause following the W addition to increase and the cost rising of generation.Therefore, W content is set as more than 0.05% and below 1.00%.Be preferably more than 0.10% and below 0.70%.
Nb is important condition in the present invention, by there is simultaneously, has the effect that the weathering resistance of steel in high air-borne salt environment significantly improved with W.In addition, be enriched in the near interface of rusty scale and iron-based in anode portion, suppress anodic reaction, cathodic reaction.In order fully to obtain these effects, Nb need to contain more than 0.005%.On the other hand, while surpassing 0.200%, can cause toughness drop.Therefore, Nb content is set as more than 0.005% and below 0.200%.Be preferably more than 0.010% and below 0.050%.
Sn is important condition in the present invention, by there is simultaneously, has the effect that the weathering resistance of steel in high air-borne salt environment significantly improved with W.In addition, form the oxide film thereon that contains Sn at steel surface, suppress anodic reaction, the cathodic reaction of steel, the weathering resistance of structural steel is improved.In order fully to obtain these effects, Sn need to contain more than 0.005%.On the other hand, while surpassing 0.200%, can cause the ductility of steel, toughness deteriorated.Therefore, Sn content is set as more than 0.005% and below 0.200%.Be preferably more than 0.010% and below 0.050%.
In addition, if contain in Nb and Sn at least any one, just can realize effect of the present invention.But,, if contain Nb and Sn, have the effect that further significantly improves weathering resistance.The reason of effect that contains Nb and Sn is also indefinite, but think because, in drying process and moistening process environment repeatedly, the condition that Nb and Sn significantly bring into play effect (for example, the environment such as salt concentration in temperature, relative humidity or rust) difference, therefore by Nb and Sn complement each other separately effect and further significantly improve weathering resistance.
In addition, also has following advantage: on the basis of guaranteeing the mechanical properties of steel, weldability etc., in the situation that do not make the deteriorated addition that can reduce respectively Nb, Sn of weathering resistance.For this reason, containing Nb and Sn is preferred invention mode.
Surplus is Fe and inevitable impurity., at this,, as inevitable impurity, can allow that N:0.010% is following, O:0.010% following, below Ca:0.0010%.In addition, when the Ca that contains as inevitable impurity exists in a large number in steel, make the toughness of welding heat affected zone deteriorated, therefore be preferably below 0.0010%.
Except the mentioned component element, can also add as required following alloying element.
Cr: over 0.1% and below 1.0%
Thereby Cr improves the element of weather resisteant by making the miniaturization of rust grain form fine and close rusty scale, and in order fully to obtain this effect, content need to surpass 0.1%.On the other hand, while surpassing 1.0%, can cause weldability to reduce.Therefore, contain sometimes, Cr content is for surpassing 0.1% and below 1.0%, is preferably more than 0.2% and below 0.7%.
In addition, in the present invention,, for following reason, can contain and be selected from more than one in Co, Mo, Sb and REM.
More than Co:0.01% and below 1.00%
Co is distributed in whole rusty scale, thereby have by making the miniaturization of rust grain form fine and close rusty scale, makes the effect of the weathering resistance raising of structural steel., in order fully to obtain this effect, need to contain more than 0.01%.On the other hand, while surpassing 1.00%, can cause following the Co consumption to increase and the cost rising of generation.Therefore, contain sometimes, Co content is more than 0.01% and below 1.00%, is preferably more than 0.10% and below 0.50%.
More than Mo:0.005% and below 1.000%
Mo follows the anodic reaction stripping MoO of steel
4 2-, and MoO
4 2-Be distributed in rusty scale, prevent from thus promoting the chloride ion of the factor to see through rusty scale and arrive iron-based as corrosion.In addition, contain the compound precipitation of Mo at steel surface, suppress thus the anodic reaction of steel., in order fully to obtain these effects, need to contain more than 0.005%.On the other hand, while surpassing 1.000%, can cause following the Mo consumption to increase and the cost rising of generation.Therefore, contain sometimes, Mo content is more than 0.005% and below 1.000%, is preferably more than 0.100% and below 0.500%.
More than Sb:0.005% and below 0.200%
Sb is by the anodic reaction that suppresses steel and suppresses cathodic reaction and namely produce the element that H-H reaction improves the weathering resistance of structural steel., in order fully to obtain this effect, need to contain more than 0.005%.On the other hand, while surpassing 0.200%, can cause toughness deteriorated.Therefore, contain sometimes, Sb content is more than 0.005% and below 0.200%, is preferably more than 0.020% and below 0.060%.
More than REM:0.0001% and below 0.1000%
REM is distributed in whole rusty scale, thereby have by making the miniaturization of rust grain form fine and close rusty scale, makes the effect of the weathering resistance raising of structural steel., in order fully to obtain this effect, need to contain more than 0.0001%.On the other hand, while surpassing 0.1000%, its effect is saturated.Therefore, contain sometimes, REM content is more than 0.0001% and below 0.1000%, is preferably more than 0.0010% and below 0.0350%.
In addition, in the present invention,, for following reason, can contain and be selected from more than one in Ti, V, Zr, B and Mg.
More than Ti:0.005% and below 0.200%
Ti is for improving the required element of intensity., in order fully to obtain this effect, need to contain more than 0.005%.On the other hand, while surpassing 0.200%, can cause toughness deteriorated.Therefore, contain sometimes, Ti content is more than 0.005% and below 0.200%, is preferably more than 0.010% and below 0.100%.
More than V:0.005% and below 0.200%
V is for improving the required element of intensity., in order fully to obtain this effect, need to contain more than 0.005%.While on the other hand, surpassing 0.200%, effect is saturated.Therefore, contain sometimes, V content is more than 0.005% and below 0.200%, is preferably more than 0.010% and below 0.100%.
More than Zr:0.005% and below 0.200%
Zr is for improving the required element of intensity., in order fully to obtain this effect, need to contain more than 0.005%.While on the other hand, surpassing 0.200%, effect is saturated.Therefore, contain sometimes, Zr content is more than 0.005% and below 0.200%, is preferably more than 0.010% and below 0.100%.
More than B:0.0001% and below 0.0050%
B is for improving the required element of intensity., in order fully to obtain this effect, need to contain more than 0.0001%.On the other hand, while surpassing 0.0050%, can cause toughness deteriorated.Therefore, contain sometimes, B content is more than 0.0001% and below 0.0050%, is preferably more than 0.0010% and below 0.0050%.
More than Mg:0.0001% and below 0.0100%
Thereby Mg fixes to improving the effective element of toughness of welding heat affected zone the S in steel., in order fully to obtain this effect, need to contain more than 0.0001%.On the other hand, while surpassing 0.0100%, the amount of the inclusion in steel increases, and causes on the contrary the deteriorated of toughness.Therefore, contain sometimes, Mg content is more than 0.0001% and below 0.0100%, is preferably more than 0.0020% and below 0.0050%.
In addition, for the effect of the weather resisteant in high salt time-sharing environment that fully is improved, hereinafter the R value of definition needs to meet the scope of regulation.
R value 〉=2.0 quality %
Wherein, R value=(R1 value+R2 value)
0.5
R1 value=[Cu] * 0.2+[Ni] * 3+[W] * 4+[Nb] * 20+[Sn] * 8.5
R2 value=(Log
1.5([W]
2+ 0.002)+16) * ((Log
2([Nb] * 0.1+0.001)+10)+(Log
2([Sn] * 0.1+0.001)+10) * 0.75) * 0.5
In addition, above-mentioned in, [M] expression element M content (quality %), be made as 0 while not containing element M.
Above-mentioned R value means the index of the weathering resistance of steel, and in order to obtain good weathering resistance in high salt time-sharing environment, the R value is set as more than 2.0.
The structural steel that weathering resistance of the present invention is good can obtain in the following manner: utilize the melting means such as converter (steel converter), electric furnace (electric furnace) to carry out melting by the steel that ordinary method will have the mentioned component composition, to carry out hot rolling (hot rolling) by the steel billet (slab) that common continuous casting (continuous casting), cogging method obtain, make thus the steel such as slab (steel plate), shaped steel (shaped steel), steel sheet (steel sheet), bar steel (bar steel).Heating, rolling condition can suitably be determined according to desired material, also can make up controlled rolling (controlled rolling), accelerate cooling (accelerated cooling) or reheat (reheating) such thermal treatment etc.
In addition,, by using the structural steel obtain the in the above described manner structural member as steel structure, wait the steel structure that has good weathering resistance in the many environment of air-borne salt amount near can being formed in seashore.
Embodiment
The steel of chemical constitution shown in table 1 is carried out melting, carry out hot rolling (hot rolling) after being heated to 1150 ℃, air cooling (air cooling), to room temperature (room temperature), is manufactured experimently into the steel plate of thickness 6mm.Then, cut the test film (test specimen) of 35mm * 35mm * 5mm from resulting steel plate.For test film, effects on surface carries out ground finish (grinding processing), so that surfaceness (surface roughness) Ra is below 1.6 μ m, with adhesive tape (tape) sealing (seal), the mode take the area of surperficial exposed division (exposed area) as 25mm * 25mm is also with the surface rubber belt sealing with end face (edge face), the back side (back side).
, for the test film that obtains in the above described manner, carry out the drying and watering cycle corrosion test as the method for estimating the weathering resistance in the 0.4mdd environment, and measure the thickness of slab reduction.Drying and watering cycle corrosion test method and thickness of slab reduction measuring method are as follows.
The drying and watering cycle corrosion test
, for above-mentioned test film, as shown in Figure 1, carry out humiture circulation adhering on single side surface under state salty.In the humiture circulation, with the drying process of 40 ℃ of temperature, relative humidity 40%RH be set as 11 hours, be set as 1 hour transit time, with temperature, be then that 25 ℃, relative humidity are that the moistening operation of 95%RH is set as 11 hours, be set as 1 hour transit time,, take 24 hours as a circulation, carried out for 12 weeks (84 circulations).About adhering to of salinity, before starting, the humiture circulation carries out with every seven humiture circulation times (before the drying process of humiture circulation), carry out altogether 12 times.At this moment, the specified amount of the artificial seawater solution of preparation is applied to the surface of test film, makes the salt component that is attached on surface of steel plate reach 1.4mg/dm
2.
The mensuration of thickness of slab reduction
After the drying and watering cycle corrosion test, add distilled water (distilled water) to make it reach 1L in 37% hydrochloric acid (hydrochloric acid) 500mL, vulkacit H (hexamethylene tetramine) 3.5g, ヒ PVC ロ Application (inhibitor (inhibitor) that ア イ コ ー ケ ミ カ Le company makes) 3mL, make deruster, test film is impregnated in this deruster, and is taking off the rear gravimetry of rust.Need to prove, the mensuration of weight is according to the method for record in the 145th corrosion-protection against corrosion symposium " high precision int of corrosive wear evaluation method ".In addition, obtain the poor of resulting weight and initial stage weight, and, divided by the area of the subjects face of test film, calculate thus the average thickness of slab reduction of test film single face.
The corrosion test result that obtains by the way is grouped into one-tenth, is illustrated in together with the R value in table 1-1～table 1-6.
By table 1-1～table 1-6 as can be known, in the R value was the inventive example more than 2.0, the thickness of slab reduction was 11.8～13.9 μ m, has good weathering resistance.
On the other hand, in the comparative example of the scope of stipulating in departing from the present invention, the R value is lower than 2.0, and the thickness of slab reduction is 14.3～17.7 μ m, and larger than the inventive example, weathering resistance is poor.
Claims (4)
1. structural steel, in quality %, more than containing C:0.020% and lower than 0.140%, more than Si:0.05% and below 2.00%, more than Mn:0.20% and below 2.00%, more than P:0.005% and below 0.030%, more than S:0.0001% and below 0.0200%, more than Al:0.001% and below 0.100%, more than Cu:0.10% and below 1.00%, more than Ni:0.10% and lower than 0.65%, more than W:0.05% and below 1.00%, and more than containing Nb:0.005% and below 0.200%, Sn:0.005% is above and 0.200% with lower one or both, surplus consists of iron and inevitable impurity, and meet following formula (1):
R value 〉=2.0 quality % ... formula (1)
Wherein, R value=(R1 value+R2 value)
0.5
R1 value=[Cu] * 0.2+[Ni] * 3+[W] * 4+[Nb] * 20+[Sn] * 8.5
R2 value=(Log
1.5([W]
2+ 0.002)+16) * ((Log
2([Nb] * 0.1+0.001)+10)+(Log
2([Sn] * 0.1+0.001)+10) * 0.75) * 0.5,
In addition, above-mentioned in, [M] expression element M content (quality %), be made as 0 while not containing element M.
2. structural steel as claimed in claim 1, wherein,, in quality %, also contain Cr: over 0.1% and below 1.0%.
3. structural steel as claimed in claim 1 or 2, wherein, in quality %, also contain be selected from that Co:0.01% is above and 1.00% following, Mo:0.005% is above and 1.000% following, Sb:0.005% is above and 0.200% following, REM:0.0001% is above and 0.1000% with lower more than one.
4. structural steel as described in any one in claim 1～3, wherein, in quality %, also contain be selected from that Ti:0.005% is above and 0.200% following, V:0.005% is above and 0.200% following, Zr:0.005% is above and 0.200% following, B:0.0001% is above and 0.0050% following, Mg:0.0001% is above and 0.0100% with lower more than one.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011039222A JP5120472B2 (en) | 2011-02-25 | 2011-02-25 | Structural steel with excellent weather resistance |
| JP2011-039222 | 2011-02-25 | ||
| PCT/JP2012/055297 WO2012115280A1 (en) | 2011-02-25 | 2012-02-24 | Structural steel exhibiting superior weather resistance |
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| Publication Number | Publication Date |
|---|---|
| CN103392023A true CN103392023A (en) | 2013-11-13 |
| CN103392023B CN103392023B (en) | 2015-09-30 |
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|---|---|
| JP (1) | JP5120472B2 (en) |
| KR (2) | KR20130123431A (en) |
| CN (1) | CN103392023B (en) |
| MY (1) | MY153633A (en) |
| WO (1) | WO2012115280A1 (en) |
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| CN103451537B (en) * | 2013-08-16 | 2016-04-27 | 江苏省沙钢钢铁研究院有限公司 | A kind of low temperature weather steel plate of high welding performance and production method thereof |
| WO2015029994A1 (en) * | 2013-08-29 | 2015-03-05 | 新日鐵住金株式会社 | STEEL IN WHICH Cu-Sn COEXIST, AND METHOD FOR MANUFACTURING SAME |
| JP6128102B2 (en) * | 2014-11-22 | 2017-05-17 | Ｊｆｅスチール株式会社 | Method for evaluating delayed fracture characteristics of metal material and metal material |
| JP6601258B2 (en) * | 2016-02-22 | 2019-11-06 | 日本製鉄株式会社 | Corrosion-resistant steel for ballast tanks |
| JP6658412B2 (en) * | 2016-09-06 | 2020-03-04 | Ｊｆｅスチール株式会社 | Structural steel materials and structures with excellent coating durability |
| JP6772942B2 (en) * | 2017-04-18 | 2020-10-21 | 日本製鉄株式会社 | Corrosion resistant steel for ballast tanks |
| JP7415140B2 (en) | 2019-11-25 | 2024-01-17 | 日本製鉄株式会社 | steel material |
| CN111394558B (en) * | 2020-03-12 | 2021-12-03 | 唐山不锈钢有限责任公司 | Steel belt for automobile hollow stabilizer bar and production method thereof |
| JP7192824B2 (en) * | 2020-03-31 | 2022-12-20 | Ｊｆｅスチール株式会社 | Structural steel materials and structures with excellent fire resistance and paint corrosion resistance |
| CN113621867B (en) * | 2021-08-06 | 2022-03-18 | 联峰钢铁（张家港）有限公司 | Method for optimizing production of low-cost 20CrMoA round steel by reducing VD (vacuum distillation) process and combining components |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004360063A (en) * | 2003-05-15 | 2004-12-24 | Sumitomo Metal Ind Ltd | Steel material superior in beach weather resistance, and structure using it |
| JP2006118011A (en) * | 2004-10-22 | 2006-05-11 | Sumitomo Metal Ind Ltd | Steel having excellent seaside weather resistance and structure |
| JP2010163643A (en) * | 2009-01-14 | 2010-07-29 | Jfe Steel Corp | Structural steel material having excellent weatherability |
-
2011
- 2011-02-25 JP JP2011039222A patent/JP5120472B2/en active Active
-
2012
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004360063A (en) * | 2003-05-15 | 2004-12-24 | Sumitomo Metal Ind Ltd | Steel material superior in beach weather resistance, and structure using it |
| JP2006118011A (en) * | 2004-10-22 | 2006-05-11 | Sumitomo Metal Ind Ltd | Steel having excellent seaside weather resistance and structure |
| JP2010163643A (en) * | 2009-01-14 | 2010-07-29 | Jfe Steel Corp | Structural steel material having excellent weatherability |
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|---|---|
| KR20150067771A (en) | 2015-06-18 |
| JP2012177143A (en) | 2012-09-13 |
| KR20130123431A (en) | 2013-11-12 |
| MY153633A (en) | 2015-03-03 |
| WO2012115280A1 (en) | 2012-08-30 |
| CN103392023B (en) | 2015-09-30 |
| JP5120472B2 (en) | 2013-01-16 |
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