CN102575327A - Steel material for structures having excellent weather resistance and steel structure - Google Patents
Steel material for structures having excellent weather resistance and steel structure Download PDFInfo
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Abstract
Disclosed are: a low-cost steel material for structures, which has excellent weather resistance; and a steel structure. Specifically disclosed is a steel material for structures, which contains, in mass%, 0.020% or more but less than 0.140% of C, 0.05-2.00% (inclusive) of Si, 0.20-2.00% (inclusive) of Mn, 0.005-0.030% (inclusive) of P, 0.0001-0.0200% (inclusive) of S, 0.001-0.100% (inclusive) of Al, 0.10-1.00% (inclusive) of Cu, 0.10% or more but less than 0.65% of Ni and 0.05-1.00% (inclusive) of W and additionally contains either 0.005-0.200% (inclusive) of Nb and/or 0.005-0.200% (inclusive) of Sn, with the balance made up of iron and unavoidable impurities.
Description
Technical field
The present invention relates generally to the steel structure (Steel Structures) that bridge (bridge) etc. uses out of doors, particularly be suitable near the many environment of (coastal environment) the air suspension salinity (air-borne salt) of the etc.ing seashore down use, requirement has the steel and the steel structure of the member of weathering resistance (atmospheric corrosion resistance).
Background technology
All the time, in the steel structure that bridge etc. uses out of doors, use weathering steel (weathering steel).Weathering steel is a kind of like this steel; Be exposed under the atmospheric environment (atmospheric environment); The protectiveness high rusty scale (rust layer) of weathering steel through there are alloying element multiviscosisty such as Cu, P, Cr, Ni to form in surface coverage, corrosion speed (corrosion rate) significantly reduces.So known because its excellent weathering resistance is the bridge that uses weathering steel durable decades under the state of no application (paintless) usually.
Yet near known seashore, the grade in the many environment of air suspension salt component (amount of air-borne salt) is difficult to generate the high rusty scale of above-mentioned protectiveness, is difficult to obtain practical weathering resistance.
According to non-patent literature 1, existing weathering steel (JIS G 3114: welded construction is used the weathering resistance hot-strip) can be 0.05mgNaCl/dm at air suspension salt component only
2/ day (the following mdd representation unit (mgNaCl/dm that uses sometimes
2/ day)) use of following zone with having application.Therefore, waiting near the seashore under the many environment of air suspension salt component, common iron (JIS G 3106: Rolled Steel For Welded Structure) implement anticorrosive measure such as application and use.Need to prove that dm is meant decimetre (decimeter).
Concerning application (coating), (coating film) deterioration of filming of process in time needs scheduled maintenance (maintenance and repair).In addition, (labor cost) is high for human cost, application again (recoating) difficulty.For above-mentioned reasons, needing at present not to have the steel that application is used, high to expectation that can not have the steel that application uses.
In view of above-mentioned present situation, in recent years, as having developed the steel that contain a large amount of multiple alloying element, especially Ni waiting steel that no application is used under the many environment of air suspension salinity near the seashore.
For example, in patent documentation 1, disclose and be added with the high weather resistance steel material of the above Ni of Cu and 1 weight % as the element that improves weathering resistance.
In addition, in patent documentation 2, the excellent steel of weathering resistance that are added with above Ni of 1mass% and Mo are disclosed.
In addition, in patent documentation 3, the excellent steel of weathering resistance that except Ni, also are added with Cu, Ti are disclosed.
In addition, in patent documentation 4, disclose and contained a large amount of Ni, contain the steel for welded structures material of Mo, Sn, Sb, P etc. in addition.
On the other hand; Though do not mention near the weathering resistance that seashore, waits in the many environment of air suspension salinity; But, disclose in the patent documentation 5 and contained W and Cr, contain the corrosion-resistant steel material for ship and vessel of Sb, Sn, Ni etc. in addition as the corrosion-resistant steel that the harsh corrosive environment (corrosion environment) that directly stands the seawater spittle at the ballast tank (ballast tank) of boats and ships etc. uses down.
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 1: about the joint research report (XX) of the application of weather-proof steel on bridge, No. 88, build and economize building institute in March, 1993, (society) steel social hall, (society) Japanese bridge is built association
Summary of the invention
Yet, of patent documentation 1,2, when increasing the content of Ni, there is the problem that rises and cause price of steel product to rise by cost of alloy.
In addition, in patent documentation 3, though Ni content is controlled at lower level, and add Cu, Ti, the present invention adds element to other and explores.
In addition, of patent documentation 4, concerning the content that increases Ni, contain Cu, Mo, Sn, Sb, P etc. steel, cause price of steel product to raise by the increase of cost of alloy, and because the content of P is high, thereby weldableness reduces.
In addition, patent documentation 5 disclosed steel are owing to the purposes difference, so the corrosion resistance nature that requires is different, for waiting weathering resistance under the air suspension salinity environment how also undeclared near the seashore.
In view of the foregoing, the object of the present invention is to provide the structural steel and the steel structure of low cost, weathering resistance excellence.
In order to solve above-mentioned problem, the present invention is from the viewpoint consideration of the many environment weathering resistances down of air suspension salinity, the one-tenth of steel is grouped into furthers investigate.The result finds, through compound W of containing and Sn and/or Nb in the base steel that contains Cu, Ni, can improve the weathering resistance of the steel under the many environment of air suspension salinity.
Fig. 1 is the result that the steel enforcement drying and watering cycle corrosion test (wet and dry cyclic corrosion test) with composition shown in the table 1 is obtained.The drying and watering cycle corrosion test is carried out as follows: choose the test film of 35mm * 35mm * 5mm from above-mentioned steel, next, for the test film of choosing; Artificial seawater solution (diluted solution of artificial seawater) surface of coated test sheet in drying process (dry process) with preparation; Once in a week, make that the salt component of surface attachment is 0.2mdd, the drying process of 40 ℃ of temperature, relative humidity (relative humidity) 40%RH is 11 hours; The moistening operation of 25 ℃ of temperature, relative humidity 95%RH (wet process) is 11 hours; Be 1 hour transit time, with 24 hours be 1 circulation (cycle), carried out for 12 weeks (84 circulations); Next; Test film impregnated in hydrochloric acid (hydrochloric acid), to add to be had in the aqueous solution of vulkacit H (hexamethylenetetramine), and (derusting), gravimetry then eliminate rust.Thickness of slab reduction among Fig. 1 (unit is μ m) is the average thickness of slab reduction of test film single face, obtains as follows: obtain the poor of above-mentioned weight that obtains and initial weight, with the surface-area of this value divided by the subjects part of test film.And then, carry out 3 same tests for a kind of steel grade, in Fig. 1, use symbol ● represent the MV of said 3 mensuration, with error bar (error bar) expression peak and minimum value (minimum and maximum values).
Need to prove; Can know based on present understanding,, be about 0.5mdd if the salt component 0.2mdd that adheres in this corrosion test is scaled air suspension salt component; When air suspension salt component is about 0.5mdd, be equivalent to wait the many environment of air suspension salt component near the seashore.
In addition; When utilizing extrapotation to obtain the etching extent after 100 years by the average thickness of slab reduction that obtains through test; The average thickness of slab reduction that obtains during this corrosion test is 14 μ m when following, and the average thickness of slab reduction after 100 years is below the 0.5mm, does not have the generation of exfoliated rust.
Usually; The known standard that could be applied to not have the bridge of application weathering steel is that the thickness of slab reduction after 100 years is below the 0.5mm, therefore, various steel is carried out this corrosion test; If the average thickness of slab reduction that obtains is below the 14 μ m, just can be applicable to not have the bridge of the weathering steel of application.
As stated, in Fig. 1, be the steel below the 14 μ m to average thickness of slab reduction, be judged to be the weathering resistance excellence.
Result by Fig. 1 can know; The steel (steel grade D) of compound W of containing and Nb or the compound steel (steel grade C) that contains W and Sn in base steel (steel grade R); Average thickness of slab reduction is less than 14 μ m; (steel grade A, B, E～P) compare, weathering resistance is especially excellent with the combination of existing weathering steel (steel grade Q), ordinary steel (steel grade S), other elements.In addition, when the many steel grade T of steel grade C, D and Ni content were compared, the weathering resistance of steel grade C, D was superior to the weathering resistance of steel grade T.
As stated, although steel grade C, D Ni content are few, show excellent weathering resistance, reason is inferred as follows.
Steel grade C, D are the steel that Ni content is few, contain Cu, the compound W of containing, Nb and/or Sn.Cu, Ni make the rusty scale densification, prevent that promoting the chloride ion of the factor to see through rusty scale as corrosion arrives bottom iron plate.W suppresses anodic reaction in anode portion, at the near interface formation of rusty scale and bottom iron plate and the composite oxides of Fe.In addition, be distributed in rusty scale with the form of W acid ion, thereby present the cation selective perviousness, prevent that promoting the chloride ion of the factor to see through rusty scale as corrosion arrives bottom iron plate.Nb suppresses anodic reaction, cathodic reaction in anode portion, in the near interface multiviscosisty of rusty scale and bottom iron plate.Sn and Nb likewise in anode portion, in the near interface generation multiviscosisty of rusty scale and bottom iron plate, suppress anodic reaction, cathodic reaction.But above-mentioned effect is containing insufficiently sometimes separately, infers when the compound Cu of containing, Ni, W and Nb and/or Sn, produces synergy, thereby significantly improves the corrosion inhibition effect of Cu, Ni, W, Nb, Sn.
Especially; The steel (steel grade X) that will in the steel (steel grade U) of the compound Cu of containing, Ni, W, contain the steel (steel grade V, W) of Nb or Sn and in above-mentioned steel grade U, contain Nb and Sn is when comparing; Compare with the weathering resistance of steel grade V, W, the weathering resistance of steel grade X is especially excellent.
As steel grade C, D, V, and W, as long as contain among Nb and the Sn at least any, just can play effect of the present invention.But, shown in steel grade X, can know if contain Nb and Sn then have the effect that improves weathering resistance more significantly.
The present invention is based on above-mentioned discovery completion.Main points of the present invention are following.
[1] the excellent structural steel of a kind of weathering resistance is characterized in that, in quality %, contains following composition:
0.020％≤C＜0.140％、
0.05％≤S≤2.00％、
0.20％≤Mn≤2.00％、
0.005％≤P≤0.030％、
0.0001％≤S≤0.0200％、
0.001％≤Al≤0.100％、
0.10％≤Cu≤1.00％、
0.10％≤Ni＜0.65％、
0.05％≤W≤1.00％，
Also contain a kind or 2 kinds in the following composition:
0.005％≤Nb≤0.200％、
0.005％≤Sn≤0.200％，
Surplus is iron and unavoidable impurities.
[2] like the excellent structural steel of above-mentioned [1] described weathering resistance, it is characterized in that,, also contain following composition in quality %:
0.005%≤Nb≤0.200% draw
0.005％≤Sn≤0.200％。
[3] like the excellent structural steel of above-mentioned [1] or [2] described weathering resistance, it is characterized in that, in quality %, also contain: 0.1%＜Cr≤1.0%.
[4] like the excellent structural steel of each described weathering resistance in above-mentioned [1]～[3], it is characterized in that,, also contain and be selected from the following composition more than one in quality %:
0.01％≤Co≤1.00％、
0.005％≤Mo≤1.000％、
0.005％≤Sb≤0.200％、
0.0001％≤REM≤0.1000％。
[5] like the excellent structural steel of each described weathering resistance in above-mentioned [1]～[4], it is characterized in that,, also contain and be selected from the following composition more than one in quality %:
0.005％≤Ti≤0.200％、
0.005％≤V≤0.200％、
0.005％≤Zr≤0.200％、
0.0001％≤B≤0.0050％、
0.0001％≤Mg≤0.0100％。
[6] like the excellent structural steel of each described weathering resistance in above-mentioned [1]～[5], it is characterized in that the welding crack sensibility index Pcm that defines with following formula (1) is below the 0.25 quality %,
Pcm＝[C]+[Si]/30+[Mn]/20+[Cu]/20+[Ni]/60+[Cr]/20+[Mo]/15+[V]/10+5×[B]......(1)
Wherein, [C], [S], [Mn], [Cu], [Ni], [Cr], [Mo], [V], [B] represent each constituent content (quality %).
[7] a kind of steel structure is to use in above-mentioned [1], [6] the excellent structural steel of each described weathering resistance to obtain.
Need to prove that in this specification sheets, the % of the composition of expression steel is all in quality %.In addition, among the present invention, " weathering resistance is excellent " be meant, satisfy in the practicality can be below 0.5mdd the many environment of air suspension salinity in the structural steel of the high weather resistance used.
According to the present invention, can obtain the structural steel and the steel structure of low cost, weathering resistance excellence.Structural steel of the present invention contains for improving the weathering resistance effective elements through compound; Thereby can be under the low situation of the element cost that does not contain high price such as Ni in a large number; Have practical weldableness, and waiting the weathering resistance that has excellence under the many environment of air suspension salt component near the seashore.Especially, surpass at air suspension salt component under the air suspension salinity environment how of 0.05mdd, have significant effect.But, be limited to below the 0.5mdd on the expectation air suspension salt component or the salt component that adheres on be limited to below the 0.2mdd.
Description of drawings
[Fig. 1] is the steel grade of expression shown in the table 1 (figure of steel grade No.A～X) and the relation of average thickness of slab reduction.
[Fig. 2] is the condition and the round-robin mode chart of expression corrosion test.
Embodiment
The present invention below at length is described.
0.020％≤C＜0.140％，
C is the element that improves structural steel intensity, and the intensity in order to ensure regulation is necessary to contain more than 0.020%.On the other hand, 0.140% when above, weldableness and toughness deterioration.Therefore, making C content is 0.020%≤C＜0.140%.Preferably in 0.060～0.100% scope.
0.05％≤Si≤2.00％
Si is as the reductor of system during steel, and the element as the intensity that improves structural steel intensity, guarantees to stipulate is necessary to contain more than 0.05%.On the other hand, 2.00% ground is excessive to contain sometimes the remarkable deterioration of toughness and weldableness when surpassing.Therefore, making Si content is 0.05%≤Si≤2.00%.Preferably in 0.10～0.80% scope.
0.20％≤Mn≤2.00％
Mn is the element of the intensity of raising structural steel, and the intensity in order to ensure regulation is necessary to contain more than 0.20%.On the other hand, 2.00% ground is excessive to contain sometimes toughness and weldableness deterioration when surpassing.Therefore, making Mn content is 0.20%≤Mn≤2.00%.Preferably in 0.20～1.50% scope.
0.005％≤P≤0.030％
P is the element of the weathering resistance of raising structural steel.In order to obtain above-mentioned effect, be necessary to contain more than 0.005%.On the other hand, surpass 0.030% and contain sometimes the weldableness deterioration.Therefore, making P content is 0.005%≤P≤0.030%.Preferably in 0.005～0.025% scope.
0.0001％≤S≤0.0200％
When containing S and surpass 0.0200%, weldableness and toughness deterioration.On the other hand, when S content is reduced to less than 0.0001% the time, production cost increases.Therefore, making S content is 0.0001%≤S≤0.0200%.Preferably in 0.0003～0.0050% scope.
0.001％≤Al≤0.100％
Al is the needed element of deoxidation when the system steel.In order to obtain above-mentioned effect, contain more than 0.001% in respect of necessity with Al content.On the other hand, surpass at 0.100% o'clock, weldableness is had detrimentally affect.Therefore, making Al content is 0.001%≤Al≤0.100%.Preferably in 0.010～0.050% scope.Need to prove,, measure sour solvable Al for Al content.
0.10％≤Cu≤1.00％
Cu forms fine and close rusty scale through making the miniaturization of rust grain, has the effect of the weathering resistance that improves structural steel.Content can obtain above-mentioned effect 0.10% when above.On the other hand, surpass at 1.00% o'clock, along with the Cu consumption increases and causes cost to rise.Therefore, making Cu content is 0.10%≤Cu≤1.00%.Preferably in 0.20～0.50% scope.
Need to prove that patent documentation 5 is relevant with corrosion-resistant steel material for ship and vessel.It is the half the of ship's life (20 years) that the protection against corrosion of ship ballast water case is coated with membrane lifetime (being generally 10 years); Kept erosion resistance through keeping in repair application in remaining 10 years; Because present situation as stated, so the purpose of corrosion-resistant steel material for ship and vessel of record is in the patent documentation 5, at the ballast tank of boats and ships etc., directly stand under the harsh corrosive environment of seawater or its spittle; Under the situation of the condition of surface that does not influence steel; The erosion resistance that performance is excellent, can extend to the maintenance application during, and then reduce the operation of maintenance application.Relative therewith; Structural steel of the present invention is applicable to the steel structure that bridge etc. uses out of doors; Its purpose is; Waiting near the seashore under the many environment of air suspension salinity, the thickness of slab reduction after 100 years is below the 0.5mm, aspect environment that uses steel and the purpose a great difference is being arranged with the steel of putting down in writing in the patent documentation 5.Therefore, need not contain Cu in the steel that patent documentation 5 is put down in writing, need contain Cu in the present invention, form fine and close rusty scale, improve the weathering resistance of steel.Therefore, as stated, contain the Cu more than 0.10% among the present invention.
0.10％≤Ni＜0.65％
Ni forms fine and close rusty scale through making the miniaturization of rust grain, has the effect of the weathering resistance that improves structural steel.In order to obtain this effect fully, need contain more than 0.10%.On the other hand, be 0.65% when above, along with the Ni consumption increases and causes cost to rise.Therefore, making Ni content is 0.10%≤Ni＜0.65%.Preferably in 0.15～0.50% scope.
0.05%≤W≤1.00%, 0.005%≤Nb≤0.200% and/or 0.005%≤Sn≤0.200%
W is an important document important among the present invention, through coexisting with Nb and/or Sn, has the effect of the weathering resistance that significantly improves the steel in the many environment of air suspension salinity.In addition, be accompanied by the anodic reaction of steel, WO
4 2-Stripping, in rusty scale with WO
4 2-Form distributes, thereby static prevents to corrode the chloride ion that promotes the factor and sees through rusty scale arrival bottom iron plate.In addition, the compound precipitation through containing W suppresses the anodic reaction of steel in steel surface.In order to obtain above-mentioned effect fully, need contain more than 0.05%.On the other hand, surpass at 1.00% o'clock, along with the W consumption increases and causes cost to rise.Therefore, making W content is 0.05%≤W≤1.00%.Preferably in 0.10～0.70% scope.
Nb is an important document important among the present invention, the effect of the weathering resistance that significantly improves the steel in the many environment of air suspension salinity through coexisting with W, having.In addition, in anode portion, in the near interface generation multiviscosisty of rusty scale and bottom iron plate, suppress anodic reaction, cathodic reaction.In order to obtain above-mentioned effect fully, need contain more than 0.005%.On the other hand, surpass at 0.200% o'clock, cause toughness to reduce.Therefore, making Nb content is 0.005%≤Nb≤0.200%.Preferably in 0.010～0.030% scope.
Sn is important important document among the present invention, the effect of the weathering resistance that significantly improves the steel in the many environment of air suspension salinity through coexisting with W, having.In addition,, suppress anodic reaction, the cathodic reaction of steel, thereby improve the weathering resistance of structural steel through forming the sull that contains Sn at steel surface.In order to obtain above-mentioned effect fully, need contain more than 0.005%.On the other hand, surpass at 0.200% o'clock, cause the ductility and the toughness deterioration of steel.Therefore, making Sn content is 0.005%≤Sn≤0.200%.Preferably in 0.010～0.050% scope.
In addition, as long as contain among Nb and the Sn at least any, can realize effect of the present invention.But,, then can have the effect that improves weathering resistance more significantly if contain Nb and Sn.Reason for the effect that contains Nb and Sn; Though it is indeterminate; But think because following reason produces: under the environment that repeats drying process and moistening operation, Nb and Sn significantly bring into play effect condition (for example temperature, relative humidity or become rusty in environment such as salt concentration) different, therefore; Nb and Sn have complementary action to effect each other, thereby improve weathering resistance more significantly.
In addition, except that the mechanical properties of guaranteeing steel, weldableness etc., also have following advantage, promptly under the situation that does not make the weathering resistance deterioration, can reduce the addition of Nb, Sn respectively.For the foregoing reasons, containing Nb and Sn is preferred version of the present invention.
Surplus is Fe and unavoidable impurities.
As unavoidable impurities, can allow below the N:0.010% here,, below the O:0.010%, below the Ca:0.0010%.In addition, when the Ca that contains as unavoidable impurities exists in a large number, make the toughness deterioration of welding heat affected zone in steel, therefore be preferably below 0.0010%.
Except the mentioned component element, can add following alloying element as required.
0.1％＜Cr≤1.0％
Cr is through making the element of the fine and close rusty scale of rust grain miniaturization formation, raising weathering resistance, in order to obtain above-mentioned effect fully, being necessary to contain Cr with the amount above 0.1%.On the other hand, surpass at 1.0% o'clock, cause weldableness to reduce.Therefore, when containing Cr, making Cr content is 0.1%＜Cr≤1.0%.Preferably in 0.2～0.7% scope.
In addition, among the present invention, based on following reason, can contain be selected among Co, Mo, Sb and the REM more than a kind.
0.01％≤Co≤1.00％
Co is distributed in whole rusty scale, forms fine and close rusty scale through making the miniaturization of rust grain, has the effect of the weathering resistance that improves structural steel.In order to obtain above-mentioned effect fully, be necessary to contain more than 0.01%.On the other hand, surpass at 1.00% o'clock, along with the Co consumption increases and causes cost to rise.Therefore, when containing Co, making Co content is 0.01%≤Co≤1.00%.Preferably in 0.10～0.50% scope.
0.005％≤Mo≤1.000％
For Mo, be accompanied by the anodic reaction MoO of steel
4 2-Stripping, MoO
4 2-Be distributed in the rusty scale, see through rusty scale arrival bottom iron plate thereby prevent to corrode the chloride ion that promotes the factor.In addition, the compound precipitation through containing Mo is in steel surface, and suppresses the anodic reaction of steel.In order fully to obtain above-mentioned effect, need contain the Mo more than 0.005%.On the other hand, surpass at 1.000% o'clock, along with the Mo consumption increases and causes cost to rise.Therefore, when containing Mo, making Mo content is 0.005%≤Mo≤1.000%.Preferably in 0.100～0.500% scope.
0.005％≤Sb≤0.200％
Sb is through the anodic reaction that suppresses steel, suppresses to improve as the evolving hydrogen reaction of cathodic reaction the element of the weathering resistance of structural steel simultaneously.In order fully to obtain above-mentioned effect, need contain the Sb more than 0.005%.On the other hand, surpass at 0.200% o'clock, cause the toughness deterioration.Therefore, when containing Sb, making Sb content is 0.005%≤Sb≤0.200%.Preferably in 0.010～0.050% scope.
0.0001％≤REM≤0.1000％
REM is distributed in whole rusty scale, forms fine and close rusty scale through making the miniaturization of rust grain, has the effect of the weathering resistance that improves structural steel.In order fully to obtain above-mentioned effect, need contain the REM more than 0.0001%.On the other hand, surpass at 0.1000% o'clock, above-mentioned effect is saturated.Therefore, when containing REM, making REM content is 0.0001%≤REM≤0.1000%.Preferably in 0.0010～0.0100% scope.
In addition, among the present invention, based on following reason, can contain be selected among Ti, V, Zr, B and the Mg more than a kind.
0.005％≤Ti≤0.200％
Ti is in order to improve the needed element of intensity.In order fully to obtain above-mentioned effect, need contain the Ti more than 0.005%.On the other hand, surpass at 0.200% o'clock, cause the toughness deterioration.Therefore, when containing Ti, making Ti content is 0.005%≤Ti≤0.200%.Preferably in 0.010～0.100% scope.
0.005％≤V≤0.200％
V is in order to improve the needed element of intensity.In order fully to obtain above-mentioned effect, need contain the V more than 0.005%.On the other hand, surpass at 0.200% o'clock, effect is saturated.Therefore, when containing V, making V content is 0.005%≤V≤0.200%.Preferably in 0.010～0.100% scope.
0.005％≤Zr≤0.200％
Zr is in order to improve the needed element of intensity.In order fully to obtain above-mentioned effect, need contain the Zr more than 0.005%.On the other hand, surpass at 0.200% o'clock, effect is saturated.Therefore, when containing Zr, making Zr content is 0.005%≤Zr≤0.200%.Preferably in 0.010～0.100% scope.
0.0001％≤B≤0.0050％
B is in order to improve the needed element of intensity.In order fully to obtain above-mentioned effect, need contain the B more than 0.0001%.On the other hand, surpass at 0.0050% o'clock, cause the toughness deterioration.Therefore, when containing B, making B content is 0.0001%≤B≤0.0050%.Preferably in 0.0005～0.0020% scope.
0.0001％≤Mg≤0.0100％
Mg is to the S in the fixing steel, improves the toughness effective elements of welding heat affected zone.In order fully to obtain above-mentioned effect, need contain the Mg more than 0.0001%.Another surpasses at 0.0100% o'clock face to face, and the amount increase of steel inclusion causes the toughness deterioration on the contrary.Therefore, when containing Mg, making Mg content is 0.0001%≤Mg≤0.0100%.Preferably in 0.0005～0.0020% scope.
Below the Pcm:0.25 quality %
In addition, the low temperature cracking when preventing to weld, and the preheating temperature when making welding procedure is below 50 ℃ the time, in order to reach level no problem in the actually operating, the welding crack sensibility index Pcm of preferred following formula definition is below the 0.25 quality %.Be preferably the scope below the 0.20 quality %.
Pcm＝[C]+[Si]/30+[Mn]/20+[Cu]/20+[Ni]/60+[Cr]/20+[Mo]/15+[V]/10+5×[B]
Need to prove that [C], [Si], [Mn], [Cu], [Ni], [Cr], [Mo], [V], [B] represent the content (quality %) of each element.
The structural steel that weathering resistance of the present invention is excellent can obtain as follows: utilize ordinary method that the steel with mentioned component composition is carried out melting with converter (steel converter), electric furnace melting equipments such as (electric furnace), the slab (slab) that utilizes common continuous casting (continuous casting) or cogging method and obtain is carried out hot rolling (hot rolling) make Plate Steel (steel plate) or shaped steel (shaped steel), tole (steel sheet), bar steel steel such as (bar steel).Heating, rolling condition can suitably confirm according to desired material, also can carry out controlled rolling (controlled rolling), quicken the combination of the thermal treatment etc. of cooling (accelerated cooling) or reheat (reheating).
In addition, through using the structural steel obtain as stated structural member, can be formed on the steel structure that has excellent weathering resistance under near the many environment of the air suspension salt component that waits the seashore as steel structure.
Embodiment
The steel of the chemical constitution shown in the his-and-hers watches 2 carries out melting, after being heated to 1150 ℃, carries out hot rolling (hot rolling), and air cooling (air cooling) is manufactured experimently into the steel plate of thick 6mm to room temperature (room temperature).Next, choose the test film (test specimen) of 35mm * 35mm * 5mm from the steel plate that obtains.Ground finish (grinding processing) is carried out on the test film surface made that surfaceness (surface roughness) Ra is below the 1.6 μ m; With adhesive tape (tape) sealing (seal) end face (edge face), the back side (back side), the surface also seals with adhesive tape and makes that the area of surperficial exposed division (exposed area) is 25mm * 25mm.
For the test film that obtains as stated, carry out weathering test (wet and dry cyclic corrosion test), estimate weathering resistance.
As the weathering resistance evaluation test, simulate the corrosion test of the inner environment of beam environment, that drenched with rain (girder) the most harsh in the works such as bridge that are considered to actual.The condition of corrosion test is described below.Carry out the drying process 11 hours of 40 ℃ of temperature, relative humidity 40%RH, then, through 1 hour transit time; Then; Carry out the moistening operation 11 hours of 25 ℃ of temperature, relative humidity 95%RH, then, through 1 hour transit time; Amounting to 24 hours is 1 circulation, the humiture circulation of simulation actual environment.In addition, in drying process that the artificial seawater solution coat of preparation is surperficial in test film, be coated with once weekly, making attached to the lip-deep salt component of test film is 0.2mdd.Under these conditions, through carrying out 84 round-robin tests 12 weeks.The condition of above-mentioned corrosion test and circulation schematically are shown in Fig. 2.In addition, after corrosion test finishes, test film impregnated in the aqueous solution that in hydrochloric acid, adds vulkacit H and form, eliminate rust, gravimetry is then obtained the poor of the weight that obtains and initial weight, obtains the average thickness of slab reduction of single face.If above-mentioned average thickness of slab reduction is below the 14 μ m, then be evaluated as the weathering resistance excellence.
In addition, for above-mentioned test film, estimate weldableness (weldability).As evaluation method; Implement the y-shaped welding crack test (y-siit weld cracking test) of the cold crack susceptibility (cold cracking susceptibility) of research weld part, obtain the preheating temperature (preheating temperature) that prevents welding crack (prevention of weld cracking).When the above-mentioned preheating temperature that prevents welding crack was high, it was poor to be evaluated as weldableness.
The result of the corrosion test that obtains according to the method described above and the evaluation result of weldableness together are shown in table 2 with becoming to be grouped into.
In the present invention's example (steel grade No.1～25), the thickness of slab reduction is 11.8～13.8 μ m, has excellent weathering resistance.Wherein, No.25 has excellent weathering resistance, but because Pcm surpasses 0.25 quality %, thus the preheating temperature that prevents welding crack up to 100 ℃, weldableness is poor.
Especially, contain the steel grade No.7 of Nb and Sn, with Cu, Ni, W and, the addition of Nb or Sn about equally, a kind of steel grade No.2,5 of containing among Nb or the Sn compares, weathering resistance further improves significantly.Likewise, contain the steel grade No.8 of Nb and Sn, compare with steel grade 1,4, weathering resistance further improves significantly.Likewise, contain the steel grade No.11 and 12 of Nb and Sn, compare with steel grade 10, weathering resistance improves.
On the other hand,, can know that the thickness of slab reduction is 14.3～17.7 μ m, compare that weathering resistance is far short of what is expected with example of the present invention for the comparative example that exceeds the scope of stipulating among the present invention (steel grade No.26～42).In addition, for comparative example (steel grade No.41 and No.42), the thickness of slab reduction is 14.0 μ m, 12.5 μ m, and weathering resistance is excellent, but owing to contain a large amount of Ni, so cost of alloy rises, the price of steel is high.In addition, for comparative example steel grade No.42 because Pcm surpasses 0.25 quality %, thus the preheating temperature that prevents welding crack up to 100 ℃, weldableness is poor.
[table 1]
[table 2-1]
[table 2-2]
[table 2-3]
Claims (7)
1. structural steel, in quality %, contain following composition:
0.020％≤C＜0.140％、
0.05％≤S≤2.00％、
0.20％≤Mn≤2.00％、
0.005％≤P≤0.030％、
0.0001％≤S≤0.0200％、
0.001％≤Al≤0.100％、
0.10％≤Cu≤1.00％、
0.10％≤Ni＜0.65％、
0.05％≤W≤1.00％，
Also contain a kind or 2 kinds in the following composition:
0.005％≤Nb≤0.200％、
0.005％≤Sn≤0.200％，
Surplus is iron and unavoidable impurities.
2. structural steel as claimed in claim 1, wherein, in quality %, also contain following composition:
0.005%≤Nb≤0.200% draw
0.005％≤Sn≤0.200％。
3. according to claim 1 or claim 2 structural steel wherein, in quality %, also contains: 0.1%＜Cr≤1.0%.
4. like each described structural steel in the claim 1～3, wherein,, also contain and be selected from the following composition more than one in quality %:
0.01％≤Co≤1.00％、
0.005％≤Mo≤1.000％、
0.005％≤Sb≤0.200％、
0.0001％≤REM≤0.1000％。
5. like each described structural steel in the claim 1～4, wherein,, also contain and be selected from the following composition more than one in quality %:
0.005％≤Ti≤0.200％、
0.005％≤V≤0.200％、
0.005％≤Zr≤0.200％、
0.0001％≤B≤0.0050％、
0.0001％≤Mg≤0.0100％。
6. like each described structural steel in the claim 1～5, the welding crack sensibility index Pcm that defines with following formula (1) is below the 0.25 quality %,
Pcm＝[C]+[Si]/30+[Mn]/20+[Cu]/20+[Ni]/60+[Cr]/20+[Mo]/15+[V]/10+5×[B]......(1)
Wherein, [C], [Si], [Mn], [Cu], [Ni], [Cr], [Mo], [V], [B] represent the content of each element in quality %.
7. steel structure is to use that each described structural steel obtains in the claim 1～6.
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| JP2009-226164 | 2009-09-30 | ||
| JP2009226164 | 2009-09-30 | ||
| JP2010187057 | 2010-08-24 | ||
| JP2010-187057 | 2010-08-24 | ||
| PCT/JP2010/067310 WO2011040621A1 (en) | 2009-09-30 | 2010-09-28 | Steel material for structures having excellent weather resistance and steel structure |
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| US (1) | US20120183431A1 (en) |
| EP (1) | EP2484790B1 (en) |
| JP (1) | JP5691350B2 (en) |
| KR (1) | KR20120040733A (en) |
| CN (1) | CN102575327A (en) |
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| CN107557685A (en) * | 2017-08-30 | 2018-01-09 | 武汉钢铁有限公司 | 440MPa levels ship corrosion-resisting steel and its production method under low temperature environment |
| CN108165874A (en) * | 2017-12-07 | 2018-06-15 | 安徽科汇钢结构工程有限公司 | Produce the metal material of tubular truss |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006118011A (en) * | 2004-10-22 | 2006-05-11 | Sumitomo Metal Ind Ltd | Steel having excellent seaside weather resistance and structure |
| CN1809648A (en) * | 2003-06-19 | 2006-07-26 | 住友金属工业株式会社 | Steel product excellent in characteristics of resistance to fatigue crack extension and method for production thereof |
| JP2007270198A (en) * | 2006-03-30 | 2007-10-18 | Sumitomo Metal Ind Ltd | Method for producing steel material excellent in weatherability and coating-peeling resistance |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02263948A (en) * | 1989-04-04 | 1990-10-26 | Nippon Steel Corp | Steel material for structural purpose having excellent fire resistance |
| JP3579557B2 (en) * | 1996-12-13 | 2004-10-20 | 新日本製鐵株式会社 | H-section steel for tunnel support and method of manufacturing the same |
| US20090274573A1 (en) * | 2006-12-25 | 2009-11-05 | Kei Miyanishi | Machine Structural Steel Excellent in Machinability and Strength Properties |
-
2010
- 2010-09-28 MY MYPI2012000778A patent/MY156959A/en unknown
- 2010-09-28 EP EP10820733.3A patent/EP2484790B1/en not_active Not-in-force
- 2010-09-28 KR KR1020127005703A patent/KR20120040733A/en active Search and Examination
- 2010-09-28 US US13/498,348 patent/US20120183431A1/en not_active Abandoned
- 2010-09-28 WO PCT/JP2010/067310 patent/WO2011040621A1/en active Application Filing
- 2010-09-28 CN CN2010800441019A patent/CN102575327A/en active Pending
- 2010-09-29 JP JP2010217989A patent/JP5691350B2/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1809648A (en) * | 2003-06-19 | 2006-07-26 | 住友金属工业株式会社 | Steel product excellent in characteristics of resistance to fatigue crack extension and method for production thereof |
| JP2006118011A (en) * | 2004-10-22 | 2006-05-11 | Sumitomo Metal Ind Ltd | Steel having excellent seaside weather resistance and structure |
| JP2007270198A (en) * | 2006-03-30 | 2007-10-18 | Sumitomo Metal Ind Ltd | Method for producing steel material excellent in weatherability and coating-peeling resistance |
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| CN105229189A (en) * | 2013-05-10 | 2016-01-06 | 杰富意钢铁株式会社 | Steel for welded structures material |
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Also Published As
| Publication number | Publication date |
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| EP2484790A1 (en) | 2012-08-08 |
| MY156959A (en) | 2016-04-15 |
| JP5691350B2 (en) | 2015-04-01 |
| US20120183431A1 (en) | 2012-07-19 |
| WO2011040621A1 (en) | 2011-04-07 |
| JP2012067377A (en) | 2012-04-05 |
| EP2484790A4 (en) | 2016-11-30 |
| KR20120040733A (en) | 2012-04-27 |
| EP2484790B1 (en) | 2018-05-23 |
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