CN107002197A - The structural steel having excellent weather resistance - Google Patents

The structural steel having excellent weather resistance Download PDF

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Publication number
CN107002197A
CN107002197A CN201580066830.7A CN201580066830A CN107002197A CN 107002197 A CN107002197 A CN 107002197A CN 201580066830 A CN201580066830 A CN 201580066830A CN 107002197 A CN107002197 A CN 107002197A
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China
Prior art keywords
steel
less
content
weather resistance
excellent weather
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CN201580066830.7A
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Inventor
三浦进
三浦进一
鹿毛勇
小森务
三田尾真司
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JFE Steel Corp
JFE Engineering Corp
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NKK Corp
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Building Environments (AREA)

Abstract

The present invention provides low cost and the structural steel having excellent weather resistance.It is a kind of structural steel having excellent weather resistance, contains C in terms of quality %：0.01% less than 0.20%, Si：0.05%~1.00%, Mn：0.20%~2.00%, P：0.001%~0.050%, S：0.0001%~0.0200%, Al：0.005%~0.050%, Cu：0.010%~0.500%, Nb：0.005%~0.100%, Sn：0.005%~0.300%, also, solid solution Nb amounts are 0.002%~0.080%, remainder is made up of iron and the impurity that can not be kept away.

Description

The structural steel having excellent weather resistance
Technical field
The present invention relates to structural steel.More particularly to be suitable as requiring air salt fog comparision contents are few and corrosivity not The structural steel of the part of weatherability under too high environment.
Background technology
In the past, atmospheric corrosion resistant steel was used in the open air of bridge etc. is using steel structure.Atmospheric corrosion resistant steel is in atmospheric corrosion ring In border, the high rusty scale of protectiveness that surface is thickened by alloying elements such as Cu, P, Cr, Ni is covered and what corrosion rate was remarkably decreased Steel.It is known because of its excellent weatherability, tens of years are stood in the state of without application using the bridge of atmospheric corrosion resistant steel Use.
Atmospheric corrosion resistant steel is in U.S.'s exploitation, the works applied to building etc. in generation nineteen thirty.Thereafter also it is introduced into Japan, manufactures atmospheric corrosion resistant steel, applied to bridge etc..Therefore, after atmospheric corrosion resistant steel is developed by the U.S., obtain a large amount of by every country The achievement of introduction.In addition, the significant various countries of economic development using BRICS as representative, the maintenance of presently implemented infrastructure, especially It is that it maintains the increase of administration fee to be considered as problem.For example, because use atmospheric corrosion resistant steel is without application bridge, with application bridge phase Than can lower suppress maintenance cost, so being also desirable that the application of atmospheric corrosion resistant steel in above-mentioned various countries.In view of economical at these Develop the use of significant various countries, it is necessary to consider the cost degradation of steel.For example, the key element of the steel as low cost, can be lifted Go out cost of alloy low.Additionally, it is believed that these various countries have than broader territory, the remote region of the distance from coastline is air The poor environment of salt fog is more.Therefore, it is desirable to air salt fog comparision contents are few and corrosivity less high environment under being capable of nothing The steel used to application.
So far, as the gimmick for the weatherability for improving steel, for example, patent document 1 discloses addition Cu and 1 matter Measure more than % Ni high-weatherability steel.In addition, patent document 2 discloses that addition more than 1 mass % Ni's and Mo is weather-proof The excellent steel of property.In addition, patent document 3 discloses that in addition to Ni, adding Cu, Ti steel having excellent weather resistance.In addition, Patent document 4 discloses that containing a large amount of Ni, the steel for welded structures material also containing Cu, Mo, Sn, Sb, P etc..In addition, patent document 5 disclose the steel of the excellent corrosion resistance added with Sn.
Prior art literature
Patent document
Patent document 1:Japanese Unexamined Patent Publication 11-172370 publications
Patent document 2:Japanese Unexamined Patent Publication 2002-309340 publications
Patent document 3:Japanese Unexamined Patent Publication 11-71632 publications
Patent document 4:Japanese Unexamined Patent Publication 10-251797 publications
Patent document 5:Japanese Unexamined Patent Publication 2012-255184 publications
The content of the invention
However, as shown in patent document 1,2 and 3, in the case of the content for increasing Ni, existing because the rising of cost of alloy is drawn The price for playing steel rises the problem of point.In addition, as shown in patent document 4, increase Ni and P content and containing Cu, Mo, Sn, In Sb etc. steel, because the rising of cost of alloy causes the price of steel to rise, and because P content is high, weldability reduction. In addition, existing as described in Patent Document 5 in the case of increase Sn content because the rising of cost of alloy causes in the price of steel Rise and encourage hot short problem points.
The invention that the present invention is in view of the above fact and completed, its object is to provide a kind of low cost and have excellent weather resistance Structural steel.
In order to solve above-mentioned problem, the composition composition for steel from the viewpoint of weatherability has made intensive studies. Its result is found by containing Cu, and then contains micro Nb, Sn, and then strict control Nb solid solution capacity, can improve steel Weatherability.So, although the detailed reason of the excellent weatherability of display is unclear, but is estimated as follows：Cu is by making rust Particle miniaturization and be densified rusty scale so that not only prevent as corrosion promotive factor oxygen, chloride ion pass through rusty scale Substrate is reached, and by the way that the anode reaction of steel is thickened and suppressed near substrate surface.Nb passes through near substrate surface It is thickened and suppresses the anode reaction of steel, cathode reaction.Especially for raising weatherability, it is important that Nb is in steel with solid solution State is present.In addition, Sn is same with Nb, the anode reaction of steel, cathode reaction are suppressed by being thickened near substrate surface. But, presumption is if individually these effects are insufficient containing if, by containing Cu, Nb, Sn are compound and significantly improving corrosion resistance.
Idea of the invention is as shown below.
[1] a kind of structural steel having excellent weather resistance, contains C in terms of quality %：0.01% less than 0.20%, Si：0.05%~1.00%, Mn：0.20%~2.00%, P：0.001%~0.050%, S：0.0001%~0.0200%, Al：0.005%~0.050%, Cu：0.010%~0.500%, Nb：0.005%~0.100%, Sn：0.005%~ 0.300%, also, solid solution Nb amounts are 0.002%~0.080%, remainder is made up of iron and the impurity that can not be kept away.
[2] structural steel having excellent weather resistance recorded according to [1], wherein, also contain Ge in terms of quality %： 0.0005%~0.0100%.
[3] structural steel having excellent weather resistance recorded according to [1] or [2], wherein, also contain Ta in terms of quality %： 0.001%~0.100%.
[4] structural steel having excellent weather resistance recorded according to any one of [1]~[3], wherein, in terms of quality % also Contain Ni：0.01%~0.50%.
[5] structural steel having excellent weather resistance recorded according to any one of [1]~[4], wherein, in terms of quality % also Containing selected from Mo：0.005%~0.500%, Co：0.01%~0.50%, W：0.005%~0.500%, Sb：0.005%~ 0.200%th, Sc：0.001%~0.200%, Sr：0.001%~0.200%, Se：In 0.001%~0.200% it is a kind of with On.
[6] structural steel having excellent weather resistance recorded according to any one of [1]~[5], wherein, in terms of quality % also Containing selected from V：0.005%~0.200%, Zr：0.005%~0.200%, B：In 0.0001%~0.0050% it is a kind of with On.
[7] structural steel having excellent weather resistance recorded according to any one of [1]~[6], wherein, in terms of quality % also Containing selected from REM：0.0001%~0.0100%, Ca：0.0001%~0.0100%, Mg：In 0.0001%~0.0100% More than one.
During the weatherability referred in embodiment described later that had excellent weather resistance in the present invention is evaluated, average thickness of slab decrement is 20.0 below μm.
According to the present invention, the structural steel being had excellent weather resistance.Contained in the structural steel of the present invention by compound Have and effective element is improved to weatherability, make its low cost and with excellent weatherability.
Embodiment
The present invention is described in detail below.It should illustrate, in the following description, each element of composition of steel composition The unit of content is that " quality % " unless otherwise specified, is only represented with " % ".
C：0.01% less than 0.20%
C is the element for the intensity for improving structural steel, in order to ensure specific intensity, it is necessary to contain more than 0.01%. On the other hand, if more than 0.20%, then weldability and toughness deterioration.Therefore, C content be set to 0.01% less than 0.20%.
Si：0.05%~1.00%
Si makes the rust grain miniaturization of rusty scale and forms fine and close rusty scale, the effect with the weatherability for improving steel.In addition, The effect of fracture with steel surface when preventing hot rolling.In order to obtain these effects, it is necessary to contain more than 0.05%.Content Preferably more than 0.10%, more preferably more than 0.15%.On the other hand, if it exceeds 1.00% surplus contains, then toughness and Weldability is significantly deteriorated.Therefore, Si contents are set to less than 1.00%.Content is preferably less than 0.80%, and more preferably 0.60% Below.
Mn：0.20%~2.00%
Mn is the element for the intensity for improving structural steel, in order to ensure specific intensity, it is necessary to contain more than 0.20%. Content is preferably more than 0.40%.On the other hand, if it exceeds 2.00% surplus contains then toughness and weldability deterioration.Therefore, Mn contents are set to less than 2.00%.Preferably less than 1.70%.
P：0.001%~0.050%
P is the element for the weatherability for improving structural steel.To obtain the effect above, it is necessary to contain more than 0.001%.Contain Amount is preferably more than 0.003%, more preferably more than 0.005%.On the other hand, if it exceeds 0.050% contains then weldability Deterioration.Content is preferably less than 0.030%, and more preferably less than 0.020%.
S：0.0001%~0.0200%
S is if it exceeds 0.0200% contains then weldability and toughness deterioration.Content is preferably less than 0.0100%, more preferably For less than 0.0050%.On the other hand, if making content decrease below 0.0001%, production cost increase.Content is preferred For more than 0.0003%, more preferably more than 0.0005%.
Al：0.005%~0.050%
The element needed for deoxidation when Al is steel processed.In order to obtain the effect above, needed as Al content containing 0.005% More than.Preferably more than 0.010%.On the other hand, if it exceeds 0.050% produces harmful effect to weldability.Content is excellent Elect less than 0.040% as.
Cu：0.010%~0.500%
Cu is important key element in the present invention, by making it be coexisted with Nb and Sn, with the weatherability for significantly improving steel Effect.Cu suppresses the anode reaction of steel by the thickening near rusty scale-substrate interface.In addition, with by making rusty scale Rust grain miniaturization and formed densification rusty scale come suppress as corrosion promotive factor the basad transmission of chloride ion effect Really.These effects are by making content be obtained for more than 0.010%.Content is preferably more than 0.020%, more preferably more than 0.035%.On the other hand, if it exceeds 0.500% causes with the increased cost increase of Cu usage amounts.Therefore, Cu contents It is set to less than 0.500%.Preferably less than 0.300%, more preferably less than 0.200%, more preferably 0.150% with Under.
Nb：0.005%~0.100%
Nb is important key element in the present invention, by making it be coexisted with Cu and Sn, with the weatherability for significantly improving steel Effect.Nb pays nearly thickening in anode portion at the interface of rusty scale and substrate, suppresses anode reaction, cathode reaction.In order to abundant These effects are obtained, it is necessary to contain more than 0.005%.Content is more preferably more than 0.008%, more preferably more than 0.010%. On the other hand, if it exceeds 0.100%, then the reduction of toughness is caused.Therefore, Nb contents are set to less than 0.100%.More preferably Less than 0.050%, more preferably less than 0.030%.
Solid solution Nb amounts：0.002%~0.080%
Weatherability is improved for the addition by Nb, it is important that be set on the basis of above range by content, then Solid solution capacity in Nb steel is set to appropriate scope.In order that the Nb in steel plays above-mentioned weatherability and improves effect, Nb is needed Will the dissolution in rusty scale with the form of oxyacid or oxide with the corrosion of steel.On the other hand, it is known that Nb carbonitrides Typically slightly solubility material, is difficult to the dissolution in rusty scale under above-mentioned form.Therefore, if Nb formation carbonitrides, subtract Few solid solution Nb amounts on its periphery, therefore reduce the raising effect of weatherability.If solid solution Nb amounts are less than 0.002%, can not Fully obtain the raising effect of weatherability.Therefore, solid solution Nb amounts are set to more than 0.002%.Solid solution Nb amounts be preferably 0.005% with On, more preferably 0.008%.On the other hand, manufacturing cost increases if solid solution Nb amounts are more than 0.080%.Therefore, solid solution Nb Amount is set to less than 0.080%.Preferably less than 0.040%, more preferably less than 0.025%.
Sn：0.005%~0.300%
Sn is important key element in the present invention, by making it be coexisted with Cu and Nb, with the weatherability for significantly improving steel Effect.Sn is thickened in rusty scale and the near interface of substrate, suppresses anode reaction, the cathode reaction of steel.In addition, by making rust Layer rust grain miniaturization and suppress as corrode promotive factor chloride ion transmission.In order to fully obtain these effects, Need containing more than 0.005%.Content is preferably more than 0.010%, and more preferably more than 0.020%.On the other hand, if super Crossing 0.300% then causes the deterioration of the ductility of steel, toughness.In addition, causing the increased cost increase with Sn consumptions.Cause This, Sn contents are set to less than 0.300%.Preferably less than 0.100%, more preferably less than 0.045%, more preferably Less than 0.035%.
Remainder is Fe and the impurity that can not be kept away.The impurity that can not here as keep away, for example, can allow N：0.010% Below, O：Less than 0.010%.
Indispensable element more than, steel of the present invention obtain the characteristic as purpose.It should illustrate, must except above-mentioned Need outside element, the present invention can contain following element as needed.
Ge：0.0005%~0.0100%
Ge has the effect by making it coexist and significantly improve the weatherability of steel with Cu, Nb, Sn.Ge is in anode portion It is thickened in rusty scale and the near interface of substrate, suppresses anode reaction and cathode reaction.In order to fully obtain these effects, contain More than 0.0005%.Content is preferably more than 0.0010%.On the other hand, if it exceeds 0.0100% is likely to result in steel Toughness is deteriorated.Therefore, Ge contents are set to less than 0.0100%.Content is preferably less than 0.0050%.
Ta：0.001%~0.100%
Ta has the weatherability by making itself and Cu, Nb and Sn, (also containing Ge sometimes) coexist and significantly improve steel Effect.Ta is thickened in anode portion in rusty scale and the near interface of substrate, suppresses anode reaction and cathode reaction.Obtained in order to abundant To these effects, contain more than 0.001%.Content is preferably more than 0.002%.On the other hand, if it exceeds 0.100% has Cause the possibility of the deterioration of the toughness of steel.Therefore, Ta contents are set to less than 0.100%.Preferably less than 0.050%, more preferably For less than 0.014%.
Ni：0.01%~0.50%
Ni has the effect by coexisting and significantly improving the weatherability of steel with Cu, Nb, Sn, (also containing Ge, Ta sometimes) Really.Ni have by will become rusty grain miniaturization and formed densification rusty scale, so as to improve the effect of the weatherability of structural steel.For Fully obtain the effect, contain more than 0.01%.Content is preferably more than 0.02%, and more preferably more than 0.03%.It is another Aspect, if it exceeds 0.50% containing then causing with Ni consumptions increased cost increases.Therefore, Ni contents are set to 0.50% Below.Preferably less than 0.10%, more preferably less than 0.08%.
The present invention is based on following reason, can contain more than a kind in Mo, Co, W, Sb, Sc, Sr, Se.
Mo：0.005%~0.500%
Mo is with the anode reaction of steel, MoO4 2-Dissolution, the MoO in rusty scale4 2-Distribution, so as to prevent from promoting as corrosion The chloride ion for entering the factor reaches substrate through rusty scale.In addition, by precipitating the compound containing Mo in steel surface, suppressing The anode reaction of steel.In order to fully obtain these effects, contain more than 0.005%.Content is preferably more than 0.010%, more Preferably more than 0.020%.On the other hand, if it exceeds 0.500% causes with the increased cost increase of Mo consumptions.Cause This, containing in the case of, Mo contents are set to less than 0.500%.Preferably less than 0.100%, more preferably 0.080% with Under.
Co：0.01%~0.50%
Co rusty scale be distributed, with by will become rusty grain miniaturization and formed densification rusty scale, so as to improve the weather-proof of steel The effect of property.In order to fully obtain the effect above, contain more than 0.01%.On the other hand, if it exceeds 0.50% causes companion With the increased cost increase of Co consumptions.Therefore, containing in the case of, Co contents are set to less than 0.50%.
W：0.005%~0.500%
W is with the anode reaction of steel with WO4 2-Form dissolution, prevent from being used as corrosion by being distributed in rusty scale and promote The chloride ion of the factor reaches substrate through rusty scale.In addition, suppressing steel by precipitating the compound containing W in steel surface The anode reaction of material.Effect is improved in order to fully obtain these corrosion resistances, contains more than 0.005%.Content is preferably More than 0.050%.On the other hand, if it exceeds 0.500% causes with the increased cost increase of W consumptions.Therefore, containing In the case of having, W content is set to less than 0.500%.Preferably less than 0.200%.
Sb：0.005%~0.200%
Sb is the anode reaction by suppressing steel and suppresses to improve the resistance to of steel as the hydrogen reaction of formation of cathode reaction The element of time property.In order to fully obtain the effect above, contain more than 0.005%.Content is preferably more than 0.010%.The opposing party Face, is likely to result in the deterioration of toughness if surplus is containing Sb.Therefore, in the case of containing Sb, content is set to 0.200% Below.Preferably less than 0.080%.
Sc：0.001%~0.200%
Sc be rusty scale be distributed and will become rusty grain miniaturization and formed densification rusty scale, suppress corrosion promotive factor through rust Layer, so as to improve the element of the corrosion resistance of steel.In order to fully obtain the effect above, contain more than 0.001%.Content is preferably More than 0.005%.On the other hand, the deterioration of toughness is likely to result in if surplus is containing Sc.Therefore, in the situation containing Sc Under, content is set to less than 0.200%.Preferably less than 0.100%.
Sr：0.001%~0.200%
Sr is the anode reaction dissolution with steel, pH cushioning effect is played near substrate interface, so as to reduce steel The element of the anode reaction speed of material.In order to fully obtain the effect above, contain more than 0.001%.Content is preferably 0.005% More than.On the other hand, the deterioration of toughness is likely to result in if surplus is containing Sr.Therefore, in the case of containing Sr, content It is set to less than 0.200%.Preferably less than 0.100%.
Se：0.001%~0.200%
Se be with steel anode reaction in the form of oxyacid dissolution and in rusty scale be distributed, so as to prevent as corruption The chloride ion for losing promotive factor reaches substrate through rusty scale.In order to fully obtain the effect above, contain more than 0.001%. Content is preferably more than 0.005%.On the other hand, the deterioration of toughness is likely to result in if surplus is containing Se.Therefore, containing In the case of having Se, content is set to less than 0.200%.Preferably less than 0.100%.
The present invention based on it is following the reasons why can be containing more than a kind in V, Zr, B.
V：0.005%~0.200%
V is the element useful to improving intensity.In order to fully obtain the effect, contain more than 0.005%.On the other hand, If it exceeds 0.200% effect saturation.Therefore, containing in the case of, V content is set to less than 0.200%.
Zr：0.005%~0.200%
Zr is the element useful to improving intensity.In order to fully obtain the effect, contain more than 0.005%.On the other hand, If it exceeds 0.200% effect saturation.Therefore, containing in the case of, Zr contents are set to less than 0.200%.
B：0.0001%~0.0050%
B is the element useful to improving intensity.In order to fully obtain the effect, contain more than 0.0001%.On the other hand, If it exceeds 0.0050% deterioration for being likely to result in toughness.Therefore, containing in the case of, B content is set to 0.0050% Below.
The present invention based on it is following the reasons why can be containing more than a kind in REM, Ca, Mg.
REM：0.0001%~0.0100%
REM has the effect that：Rusty scale distribution, by will become rusty grain miniaturization and formed densification rusty scale, so as to improve The weatherability of steel.In order to fully obtain the effect, contain more than 0.0001%.On the other hand, if it exceeds 0.0100% The effect saturation.Therefore, containing in the case of, REM contents are set to less than 0.0100%.
Ca：0.0001%~0.0100%
Ca is to fix the S in steel and the effective element of the toughness raising to welding heat affected zone.In order to be fully somebody's turn to do Effect, contains more than 0.0001%.On the other hand, if it exceeds the amount increase of the field trash in 0.0100% steel.Have on the contrary The deterioration of toughness may be caused.Therefore, containing in the case of, Ca contents are set to less than 0.0100%.
Mg：0.0001%~0.0100%
Mg is to fix the S in steel and the effective element of the toughness raising to welding heat affected zone.In order to be fully somebody's turn to do Effect, contains more than 0.0001%.On the other hand, if it exceeds the amount increase of the field trash in 0.0100% steel, has on the contrary The deterioration of toughness may be caused.Therefore, containing in the case of, Mg contents are set to less than 0.0100%.
The structural steel of the present invention can be used for works.As the works, for example, have bridge, steel tower, lamp stand, Build mine agricultural industry machinery, tank, elevated flume, vehicle, container etc..
The structural steel having excellent weather resistance of the present invention is using usual by the steel to will be constituted with mentioned component Continuously casting, the obtained steel billet of cogging method carry out hot rolling, be manufactured into the steel of slab, shaped steel, sheet metal, rod iron etc. and obtain 's.Hereinafter, illustrated for the preferred manufacture method of steel of the present invention.For the following description, temperature is steel billet, steel plate Surface temperature.
The heating-up temperature of steel billet is related to solid solution capacity in Nb steel.By the way that billet heating temperature is set into more than 1000 DEG C, Solid solution capacity in Nb steel can be ensured necessary amount, its result can improve corrosion resistance.But, if it exceeds 1200 DEG C add Hot steel billet, it is likely that cause excessive oxide skin to generate the reduction and the increase of energy consumption of caused yield rate.Therefore, Billet heating temperature is set to 1000 DEG C~1200 DEG C.Preferably 1050 DEG C less than 1150 DEG C.
Then, the hot rolling that the temperature more than 700 DEG C terminates is implemented to the steel billet of heating, desired size shape is made Steel plate.If final rolling temperature is less than 700 DEG C, it is likely that the amount of precipitation of Nb carbonitrides caused by strain induced precipitate Increase and the Nb solid solution capacities reduction in steel.Therefore, final rolling temperature is set to more than 700 DEG C.It is preferably more than 800 DEG C, more excellent Elect more than 900 DEG C as.
Hot rolling terminate after cooling condition, can material as requested suitably determine, it is possible to implement air cooling or acceleration Cooling.In addition, when reheat heat treatment, relation reheating temperature preferably is set into 850 DEG C~more than 950 DEG C, during by stove Between be set to 5 minutes~120 minutes.The cooling velocity of quenching after reheating is not particularly limited.In addition, carrying out temper When, temperature is preferably set to 450 DEG C~680 DEG C.
The content of each element can be using spark discharge ICP Atomic Emission Spectrophotometer method, fluorescent x-ary analysis, luminous point of ICP Optical analysis and ICP mass analyses, combustion method etc. are tried to achieve.Particularly Ge, Sc, Sr content are preferred to use ICP quality analyses Method is determined.
Solid solution Nb amounts are to take the Nb contents (total Nb amounts) in steel to be evaluated with separating out the difference of Nb amounts.Separate out Nb amounts be Sample is subjected to constant current decomposition in 10vol% acetylacetone,2,4-pentanediones -1mass% tetramethyl ammonium chlorides-methanol solution, will be extracted residual Slag is carried out after alkali fusion, acid decomposition, and the Nb in solution is quantified using ICP ICP Atomic Emission Spectrophotometers method.
Embodiment 1
Embodiment described below.The technical scope of the present invention is not limited by following embodiment.For following embodiment, Using table 1-1 and table 1-2 as table 1, table 2-1 and table 2-2 are regard as table 2.
The steel of chemical composition shown in table 1 is subjected to melting, by heating steel billet to 1000 DEG C~1200 DEG C, most finish to gauge is carried out The hot rolling of 800~950 DEG C of temperature processed, is air-cooled to room temperature and prepares the steel plate that thickness is 12mm.
It should illustrate, for steel No.83, by heating steel billet to 950 DEG C, carry out the hot rolling of final 680 DEG C of rolling temperature, it is empty It is cooled to room temperature, prepares the steel plate that thickness is 12mm.
Then, 35mm × 35mm × 5mm test film is gathered from obtained steel plate.Turn into 1.6 μm with surface roughness Ra Following mode carries out grinding to the surface of test film, and its end face, the back side carried out into rubber belt sealing, and by surface also with The mode that the area of surface exposed division turns into 25mm × 25mm has carried out rubber belt sealing.
For by test film derived above, carrying out drying and watering cycle corrosion test, weatherability is evaluated.
As the evaluation test of weatherability, simulation belongs to not drenching with rain for the works such as actual bridge most severe environment Crossbeam internal environment corrosion test.The condition of corrosion test is as shown below：40 DEG C of temperature, relative humidity 40%RH it is dry Drying process 1 hour, then, will be set to after 1 hour transfer time, and temperature is 25 DEG C, and relative humidity is 95%RH wetting process 3 Hour, then it will be set to transfer time 1 hour, using total 6 hours as 1 circulation.In addition, will be to be attached to test film surface Salt component turn into the weekly table for being coated on test film in the 0.3mdd artificial seawater solution that adjusts of mode, drying process Face.The experiment of 224 circulations is carried out under conditions of more than.
After corrosion test terminates, test film is impregnated in the de- rust of aqueous solution progress that hexa is added in hydrochloric acid After determine weight, calculate the difference of obtained weight and weight at initial stage, obtain the average thickness of slab decrement (μm) of one side.If this is put down Equal thickness of slab decrement is less than 20.0 μm, then is evaluated as weather resisteant excellent.
Etching extent (average thickness of slab decrement) is shown in table 2.
Table 2-1
Steel No. Etching extent (μm)
1 18.9 Example
2 18.3 Example
3 19.2 Example
4 19.4 Example
5 18.0 Example
6 19.6 Example
7 18.4 Example
8 19.3 Example
9 18.4 Example
10 19.1 Example
11 18.8 Example
12 18.6 Example
13 19.0 Example
14 18.7 Example
15 18.9 Example
16 19.1 Example
17 18.7 Example
18 19.2 Example
19 18.4 Example
20 19.0 Example
21 18.9 Example
22 18.8 Example
23 18.6 Example
24 18.8 Example
25 19.0 Example
26 18.5 Example
27 19.0 Example
28 18.5 Example
29 23.6 Comparative example
30 22.4 Comparative example
31 21.3 Comparative example
32 18.3 Example
33 18.0 Example
34 19.0 Example
35 18.2 Example
36 18.1 Example
37 18.6 Example
38 18.5 Example
39 19.0 Example
40 19.0 Example
41 18.7 Example
42 19.0 Example
43 18.4 Example
44 18.9 Example
45 18.7 Example
46 18.4 Example
Table 2-2
Steel No. Etching extent (μm)
47 18.3 Example
48 18.6 Example
49 18.5 Example
50 18.4 Example
51 18.2 Example
52 18.4 Example
53 18.1 Example
54 18.1 Example
55 18.0 Example
56 18.2 Example
57 18.5 Example
58 18.1 Example
59 18.1 Example
60 18.5 Example
61 18.3 Example
62 18.3 Example
63 18.4 Example
64 17.9 Example
65 18.6 Example
66 18.4 Example
67 18.0 Example
68 17.9 Example
69 17.8 Example
70 18.7 Example
71 18.6 Example
72 17.9 Example
73 18.2 Example
74 17.9 Example
75 18.4 Example
76 18.5 Example
77 18.6 Example
78 18.2 Example
79 18.3 Example
80 18.0 Example
81 18.1 Example
82 17.7 Example
83 21.2 Comparative example
84 20.5 Comparative example
As shown in table 2, it is known that steel No.1~28 of the present invention, 32~82 average thickness of slab decrement are less than 20.0 μm, tool There is excellent weatherability.On the other hand, steel No.29~31 and 83~84 are compared, average thickness of slab decrement is more than 20.0 μm, with this Invention steel is poor compared to weatherability.

Claims (7)

1. a kind of structural steel having excellent weather resistance, it is characterised in that contain C in terms of quality %：0.01% less than 0.20%th, Si：0.05%~1.00%, Mn：0.20%~2.00%, P：0.001%~0.050%, S：0.0001%~ 0.0200%th, Al：0.005%~0.050%, Cu：0.010%~0.500%, Nb：0.005%~0.100%, Sn： 0.005%~0.300%, also, solid solution Nb amounts are 0.002%~0.080%, remainder is iron and the impurity that can not be kept away.
2. the structural steel according to claim 1 having excellent weather resistance, wherein, also contain Ge in terms of quality %： 0.0005%~0.0100%.
3. the structural steel according to claim 1 or 2 having excellent weather resistance, wherein, also contain Ta in terms of quality %： 0.001%~0.100%.
4. according to the structural steel according to any one of claims 1 to 3 having excellent weather resistance, wherein, in terms of quality % also Contain Ni：0.01%~0.50%.
5. according to the structural steel according to any one of claims 1 to 4 having excellent weather resistance, wherein, in terms of quality % also Containing selected from Mo：0.005%~0.500%, Co：0.01%~0.50%, W：0.005%~0.500%, Sb：0.005%~ 0.200%th, Sc：0.001%~0.200%, Sr：0.001%~0.200%, Se：In 0.001%~0.200% it is a kind of with On.
6. according to the structural steel according to any one of claims 1 to 5 having excellent weather resistance, wherein, in terms of quality % also Containing selected from V：0.005%~0.200%, Zr：0.005%~0.200%, B：In 0.0001%~0.0050% it is a kind of with On.
7. according to the structural steel according to any one of claims 1 to 6 having excellent weather resistance, wherein, in terms of quality % also Containing selected from REM：0.0001%~0.0100%, Ca：0.0001%~0.0100%, Mg：In 0.0001%~0.0100% More than one.
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