WO2011040621A1 - Acier pour des structures possédant une excellente résistance aux intempéries et structure en acier - Google Patents

Acier pour des structures possédant une excellente résistance aux intempéries et structure en acier Download PDF

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WO2011040621A1
WO2011040621A1 PCT/JP2010/067310 JP2010067310W WO2011040621A1 WO 2011040621 A1 WO2011040621 A1 WO 2011040621A1 JP 2010067310 W JP2010067310 W JP 2010067310W WO 2011040621 A1 WO2011040621 A1 WO 2011040621A1
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steel
less
weather resistance
steel material
content
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PCT/JP2010/067310
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Japanese (ja)
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三浦進一
鹿毛勇
村瀬正次
星野俊幸
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Ｊｆｅスチール株式会社
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Priority to US13/498,348 priority Critical patent/US20120183431A1/en
Priority to CN2010800441019A priority patent/CN102575327A/zh
Priority to EP10820733.3A priority patent/EP2484790B1/fr
Publication of WO2011040621A1 publication Critical patent/WO2011040621A1/fr

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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
    • 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
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
    • 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
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • 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

Definitions

  • the present invention relates to steel structures (Steel Structures) used mainly outdoors such as bridges, and in particular, weather resistance in an environment of high air-borne salt such as coastal environment (air-born salt) (
  • the present invention relates to a steel material and a steel structure that are suitable as a member that requires an atmospheric corrosion resistance.
  • weathering steel has been used.
  • Weatherproof steel is corrosion-induced by covering the surface with a highly protective rust layer enriched with alloy elements such as Cu, P, Cr, Ni, etc. in an atmosphere exposure environment (atmospheric environment). rate) is a steel material with a significant reduction. Due to its excellent weather resistance, it is known that bridges using weather resistant steel often withstand service for decades while still being paintless.
  • Non-Patent Document 1 conventional weathering steel (JIS G 3114: weathering hot rolled steel for welded structure) has an incoming salt content of 0.05 mg ⁇ NaCl / dm 2 / day (hereinafter, unit (mg (NaCl / dm 2 / day) may be expressed in mdd) Only in the following areas, it can be used without painting.
  • Patent Document 1 discloses a high weather resistance steel material to which Cu and 1 wt% or more of Ni are added as a weather resistance improving element.
  • Patent Document 2 discloses a steel material having excellent weather resistance to which 1 mass% or more of Ni and Mo are added.
  • Patent Document 3 discloses a steel material excellent in the weather resistance which added Cu and Ti in addition to Ni.
  • Patent Document 4 discloses a steel material for welded structure containing a large amount of Ni and additionally containing Mo, Sn, Sb, P and the like.
  • Patent Document 5 discloses a marine corrosion resistant steel material containing W and Cr and additionally containing Sb, Sn, Ni, and the like.
  • Japanese Patent No. 3785271 Japanese Patent Laid-Open No. 11-172370
  • Japanese Patent No. 3846218 Japanese Patent Laid-Open No. 2002-309340
  • Japanese Patent No. 3568760 Japanese Patent Laid-Open No. 11-71632
  • Patent Documents 1 and 2 when the Ni content is increased, there is a problem that the price of the steel material increases due to an increase in alloy cost.
  • Patent Document 3 the Ni content is kept low and Cu and Ti are added.
  • other additive elements were searched.
  • Patent Document 4 in steel materials that increase the Ni content and contain Cu, Mo, Sn, Sb, P, etc., the price of the steel materials increases due to an increase in alloy costs, and further, the inclusion of P Due to the high amount, weldability decreases.
  • the steel materials disclosed in Patent Document 5 have different uses, the required corrosion resistance is different, and the weather resistance in the environment of high incoming salt content such as the vicinity of the coast is not described.
  • an object of the present invention is to provide a structural steel material and a steel structure that are low in cost and excellent in weather resistance.
  • the component composition of steel materials has been intensively studied from the viewpoint of weather resistance in an environment with high flying salt content.
  • the weather resistance of the steel material in an environment with high flying salinity is improved by compositely containing W and Sn and / or Nb in the base steel containing Cu and Ni.
  • FIG. 1 shows the results of a wet and dry cyclic corrosion test for steel materials having the components shown in Table 1.
  • a 35 mm ⁇ 35 mm ⁇ 5 mm test piece was collected from the steel material, and then the artificial seawater solution (adjusted so that the amount of salt attached to the surface was 0.2 mdd with respect to the collected test piece ( Once the diluted solution of artificial water is applied to the surface of the test piece during the drying process once a week, the drying process is performed at a temperature of 40 ° C. and a relative humidity of 40% RH for 11 hours. Wet process at 25 ° C.
  • the test piece was immersed in an aqueous solution to which min (hexamethylenetetramine) was added and derusted to measure the weight.
  • the plate thickness reduction amount (unit: ⁇ m) in FIG. 1 is the average plate thickness reduction amount on one side of the test piece. The difference between the weight obtained above and the initial weight is obtained, and that value is used as the test target of the test piece. It is the value divided by the surface area of the part. Further, the same test was performed three times for each steel type, and the average value of the three measurements was indicated by a symbol ⁇ in FIG. 1, and the maximum value and the minimum value (minimum and maximum values) were error bars. Is shown.
  • the attached salt content of 0.2 mdd in this corrosion test is about 0.5 mdd when converted to the amount of incoming salt.
  • the average thickness reduction amount obtained in the period of this corrosion test is 14 ⁇ m or less, 100 years
  • the subsequent reduction in the average plate thickness is 0.5 mm or less where there is no occurrence of layered peeling rust.
  • the standard of applicability of unpainted weathering steel to bridges is known to have a thickness reduction of 0.5 mm or less after 100 years.
  • the average thickness reduction amount obtained is 14 ⁇ m or less, it can be applied to uncoated weather-resistant steel bridges. From the above, in FIG. 1, it was determined that the weather resistance was excellent with respect to a steel material having an average thickness reduction amount of 14 ⁇ m or less.
  • the average thickness reduction amount of the steel (steel grade D) containing W and Nb in combination with the base steel (steel grade R) or steel containing W and Sn (steel grade C) is less than 14 ⁇ m.
  • the value is small and the weather resistance is much better than the conventional weatherproof steel (steel grade Q), ordinary steel (steel grade S), and combinations of other elements (steel grades A, B, E to P). I understand.
  • the weather resistance of steel types C and D is superior to that of steel type T.
  • Steel types C and D are steels in which the Ni content is reduced, Cu is contained, and W, Nb and / or Sn are combined.
  • Cu and Ni densify the rust layer and prevent chloride ions, which are corrosion promoting factors, from passing through the rust layer and reaching the iron core.
  • W forms a complex oxide of Fe in the vicinity of the interface between the rust layer and the ground iron in the anode portion, and suppresses the anode reaction.
  • Nb is concentrated near the interface between the rust layer and the ground iron in the anode part to suppress the anode reaction and the cathode reaction.
  • Sn is concentrated near the interface between the rust layer and the ground iron in the anode part, and suppresses the anode reaction and the cathode reaction.
  • [3] A structural steel material excellent in weather resistance, characterized in that, in the above [1] or [2], Cr: more than 0.1% and 1.0% or less. [4] In any one of the above [1] to [3], in addition, by mass, Co: 0.01% to 1.00%, Mo: 0.005% to 1.000%, Sb: A structural steel material excellent in weather resistance, comprising at least one selected from 0.005% to 0.200% and REM: 0.0001% to 0.1000%.
  • all% which shows the component of steel is the mass%.
  • excellent weather resistance is a structural steel material that practically satisfies the high weather resistance applicable in a high flying salinity environment of 0.5 mdd or less.
  • the structural steel material of the present invention has a practical weldability at a low cost without containing a large amount of an expensive element such as Ni by containing a combination of elements effective for improving weather resistance, It can have excellent weather resistance in an environment with a large amount of incoming salt, such as in the vicinity. In particular, it has a remarkable effect in a high flying salt environment where the flying salt amount exceeds 0.05 mdd.
  • the upper limit of the incoming salt content is 0.5 mdd or less, or the upper limit of the adhered salt content is 0.2 mdd or less.
  • C 0.020% or more and less than 0.140%
  • C is an element for improving the strength of the structural steel material, and it is necessary to contain 0.020% or more in order to ensure a predetermined strength.
  • the C content is 0.020% or more and less than 0.140%.
  • it is 0.060 to 0.100% of range.
  • Si 0.05% or more and 2.00% or less Si must be contained in an amount of 0.05% or more as a deoxidizer during steelmaking and as an element for improving the strength of structural steel materials and ensuring a predetermined strength. is there. On the other hand, if it exceeds 2.00% and it contains excessively, toughness and weldability will deteriorate significantly. Therefore, the Si content is 0.05% or more and 2.00% or less. Preferably it is 0.10 to 0.80% of range.
  • Mn 0.20% or more and 2.00% or less
  • Mn is an element that improves the strength of the structural steel material, and it is necessary to contain 0.20% or more in order to ensure a predetermined strength.
  • the Mn content is 0.20% or more and 2.00% or less. Preferably it is 0.20 to 1.50% of range.
  • P 0.005% to 0.030%
  • P is an element that improves the weather resistance of the structural steel. In order to acquire such an effect, it is necessary to contain 0.005% or more. On the other hand, if it exceeds 0.030%, weldability deteriorates. Therefore, the P content is 0.005% or more and 0.030% or less. Preferably it is 0.005 to 0.025% of range.
  • the S content is set to be 0.0001% or more and 0.0200% or less. Preferably it is 0.0003 to 0.0050% of range.
  • Al 0.001% or more and 0.100% or less
  • Al is an element necessary for deoxidation during steelmaking. In order to acquire such an effect, it is necessary to contain 0.001% or more as Al content. On the other hand, if it exceeds 0.100%, the weldability is adversely affected. Therefore, the Al content is set to be 0.001% or more and 0.100% or less. Preferably it is 0.010 to 0.050% of range. In addition, Al content measured acid-soluble Al.
  • Cu 0.10% or more and 1.00% or less
  • Cu has an effect of forming a dense rust layer by refining rust grains and improving the weather resistance of the structural steel material. Such an effect is obtained when the content is 0.10% or more.
  • the Cu content is set to 0.10% or more and 1.00% or less. Preferably it is 0.20 to 0.50% of range.
  • Patent Document 5 relates to a marine corrosion resistant steel material.
  • the corrosion-resistant steel material for ships described in Patent Document 5 exhibits excellent corrosion resistance without being affected by the surface condition of the steel material in a severe corrosive environment where seawater or its splashes such as a ballast tank of a ship is directly applied, and is repaired. The purpose is to reduce the work of repair painting.
  • the structural steel material of the present invention is applied to steel structures used outdoors such as bridges, and the thickness reduction after 100 years is 0.5 mm or less in a high-flying salinity environment such as near the coast.
  • the purpose is to be different from the steel material described in Patent Document 5 in terms of the environment and purpose of using the steel material. Therefore, although it is not necessary to contain Cu in the steel material of patent document 5, in this invention, it is necessary to contain Cu, to form a dense rust layer, and to improve the weather resistance of steel materials. Therefore, as above-mentioned, in this invention, Cu shall contain 0.10% or more.
  • Ni 0.10% or more and less than 0.65%
  • Ni has an effect of forming a dense rust layer by refining rust grains and improving the weather resistance of the structural steel material. In order to obtain this effect sufficiently, it is necessary to contain 0.10% or more. On the other hand, if it is 0.65% or more, an increase in Ni consumption will be caused. Therefore, the Ni content is 0.10% or more and less than 0.65%. Preferably it is 0.15 to 0.50% of range.
  • W 0.05% to 1.00%
  • Nb 0.005% to 0.200%
  • / or Sn 0.005% to 0.200% W
  • W is an important requirement in the present invention.
  • Nb 0.005% to 0.200%
  • Sn 0.005% to 0.200%
  • W is an important requirement in the present invention.
  • WO42 ⁇ is eluted with the anode reaction of the steel material and distributed as WO42 ⁇ in the rust layer, so that the chloride ions of the corrosion promoting factor permeate the rust layer and reach the ground iron. Prevent it.
  • the precipitation of a compound containing W on the steel material surface suppresses the anode reaction of the steel material.
  • the W content is 0.05% or more and 1.00% or less. Preferably it is 0.10 to 0.70% of range.
  • Nb is an important requirement in the present invention.
  • Nb has an effect of remarkably improving the weather resistance of the steel material in a high flying salinity environment.
  • the anode portion is concentrated near the interface between the rust layer and the ground iron to suppress the anode reaction and the cathode reaction.
  • it is necessary to contain 0.005% or more.
  • the toughness is reduced. Therefore, the Nb content is 0.005% or more and 0.200% or less. Preferably it is 0.010 to 0.030% of range.
  • Sn is an important requirement in the present invention, and coexisting with W has an effect of remarkably improving the weather resistance of the steel material in a high flying salinity environment. Moreover, the weather resistance of structural steel materials is improved by forming an oxide film containing Sn on the steel material surface and suppressing the anode reaction and cathode reaction of the steel materials. In order to obtain these effects sufficiently, it is necessary to contain 0.005% or more. On the other hand, if it exceeds 0.200%, the ductility and toughness of the steel are deteriorated. Therefore, the Sn content is set to be 0.005% or more and 0.200% or less. Preferably it is 0.010 to 0.050% of range.
  • the effect of this invention can be show
  • Nb and Sn contain at least any 1 type.
  • both Nb and Sn are contained, there is an effect of improving the weather resistance more remarkably.
  • the reason for the effect of containing both Nb and Sn is not clear, but in an environment where the drying process and the wetting process are repeated, conditions under which Nb and Sn exhibit a remarkable effect (for example, temperature, relative humidity, or rust). It is considered that Nb and Sn complemented each effect to improve the weather resistance more remarkably because the environment (such as the salt concentration in the inside) is different.
  • Nb and Sn are added amounts of Nb and Sn without deteriorating the weather resistance.
  • containing both Nb and Sn is a preferred invention form.
  • the balance is Fe and inevitable impurities.
  • N 0.010% or less
  • O 0.010% or less
  • Ca 0.0010% or less are acceptable as inevitable impurities.
  • Ca contained as an unavoidable impurity is present in a large amount in steel, the toughness of the weld heat affected zone is deteriorated, so 0.0010% or less is preferable.
  • Cr more than 0.1% and 1.0% or less
  • Cr is an element that forms a dense rust layer by refining rust grains and improves weather resistance. In order to sufficiently obtain this effect, It is necessary to contain it exceeding 0.1%. On the other hand, if it exceeds 1.0%, the weldability is lowered. Therefore, when it contains, Cr content shall be 0.1% or more and 1.0% or less. Preferably it is 0.2 to 0.7% of range.
  • Co 0.01% or more and 1.00% or less
  • Co is distributed over the entire rust layer, and has the effect of improving the weather resistance of the structural steel by forming a fine rust layer by refining the rust grains. In order to sufficiently obtain such an effect, it is necessary to contain 0.01% or more. On the other hand, if it exceeds 1.00%, the cost increases with the increase in Co consumption. Therefore, when it contains, Co content shall be 0.01% or more and 1.00% or less. Preferably it is 0.10 to 0.50% of range.
  • Mo 0.005% or more and 1.000% or less Mo is dissolved in the anodic reaction of the steel material, and MoO42 ⁇ is distributed in the rust layer. To prevent it from reaching the railway. Moreover, the anode reaction of steel materials is suppressed because the compound containing Mo precipitates on the steel material surface. In order to obtain these effects sufficiently, it is necessary to contain 0.005% or more. On the other hand, if it exceeds 1.000%, the cost will increase with the increase in Mo consumption. Therefore, when it contains, Mo content shall be 0.005% or more and 1.000% or less. Preferably it is 0.100 to 0.500% of range.
  • Sb 0.005% or more and 0.200% or less
  • Sb is an element that suppresses the anode reaction of the steel material and improves the weather resistance of the structural steel material by suppressing the hydrogen generation reaction that is a cathode reaction. In order to obtain such effects sufficiently, it is necessary to contain 0.005% or more. On the other hand, if it exceeds 0.200%, the toughness is deteriorated. Therefore, when it contains, Sb content shall be 0.005% or more and 0.200% or less. Preferably it is 0.010 to 0.050% of range.
  • REM 0.0001% or more and 0.1000% or less REM is distributed over the entire rust layer, and by forming fine rust layers by refining rust grains, it has the effect of improving the weather resistance of structural steel materials. In order to obtain this effect sufficiently, it is necessary to contain 0.0001% or more. On the other hand, if it exceeds 0.1000%, the effect is saturated. Therefore, when it contains, REM content shall be 0.0001% or more and 0.1000% or less. Preferably, it is in the range of 0.0010 to 0.0100%.
  • Ti 0.005% or more and 0.200% or less
  • Ti is an element necessary for increasing the strength. In order to obtain this effect sufficiently, it is necessary to contain 0.005% or more. On the other hand, if it exceeds 0.200%, the toughness is deteriorated. Therefore, when it contains, Ti content shall be 0.005% or more and 0.200% or less. Preferably it is 0.010 to 0.100% of range.
  • V 0.005% to 0.200%
  • V is an element necessary for increasing the strength. In order to obtain this effect sufficiently, it is necessary to contain 0.005% or more. On the other hand, if it exceeds 0.200%, the effect is saturated. Therefore, when it contains, V content shall be 0.005% or more and 0.200% or less. Preferably it is 0.010 to 0.100% of range.
  • Zr 0.005% or more and 0.200% or less
  • Zr is an element necessary for increasing the strength. In order to obtain this effect sufficiently, it is necessary to contain 0.005% or more. On the other hand, if it exceeds 0.200%, the effect is saturated. Therefore, when it contains, Zr content shall be 0.005% or more and 0.200% or less. Preferably it is 0.010 to 0.100% of range.
  • B 0.0001% or more and 0.0050% or less B is an element necessary for increasing the strength. In order to obtain this effect sufficiently, it is necessary to contain 0.0001% or more. On the other hand, if it exceeds 0.0050%, the toughness is deteriorated. Therefore, when it contains, B content shall be 0.0001% or more and 0.0050% or less. Preferably it is 0.0005 to 0.0020% of range.
  • Mg 0.0001% or more and 0.0100% or less
  • Mg is an element effective for fixing S in steel and improving the toughness of the heat affected zone. In order to obtain this effect sufficiently, it is necessary to contain 0.0001% or more. On the other hand, if it exceeds 0.0100%, the amount of inclusions in the steel increases, leading to deterioration of toughness. Therefore, when it contains, Mg content shall be 0.0001% or more and 0.0100% or less. Preferably it is 0.0005 to 0.0020% of range.
  • the crack sensitivity index Pcm is preferably 0.25% by mass or less. Preferably it is 0.20 mass% or less of range.
  • Pcm [C] + [Si] / 30 + [Mn] / 20 + [Cu] / 20 + [Ni] / 60 + [Cr] / 20 + [Mo] / 15 + [V] / 10 + 5 ⁇ [B] [C], [Si], [Mn], [Cu], [Ni], [Cr], [Mo], [V], [B]: the content (% by mass) of each element.
  • the structural steel material excellent in weather resistance according to the present invention is obtained by melting a steel having the above composition by a conventional method using a melting means such as a steel converter or an electric furnace, and performing normal continuous casting.
  • the heating and rolling conditions may be appropriately determined according to the required material, and a combination of heat treatment such as controlled rolling, accelerated cooling, or reheating is also possible.
  • the structural steel material obtained as described above as a structural member of a steel structure, it is possible to obtain a steel structure having excellent weather resistance in an environment with a large amount of incoming salt such as the vicinity of the coast.
  • the weather resistance test (wet and dry cyclic corrosion test) was done, and the weather resistance was evaluated.
  • a corrosion test simulating the environment inside a girder without rain which is considered to be the most severe environment in structures such as actual bridges, was performed.
  • the conditions of the corrosion test are as follows. Drying process at 40 ° C and relative humidity 40% RH for 11 hours, then transition time is 1 hour, then temperature is 25 ° C and relative humidity is 95% RH at 11 hours, then transitions to 1 hour Time was taken to make one cycle for a total of 24 hours, simulating the actual temperature and humidity cycle.
  • the artificial seawater solution adjusted so that the amount of salt adhering to a test piece surface might be set to 0.2 mdd was apply
  • 84 cycles of tests were conducted in 12 weeks.
  • the conditions and cycle of the corrosion test are schematically shown in FIG.
  • the test piece was immersed in an aqueous solution of hexamethylenetetramine in hydrochloric acid and derusted, and then the weight was measured. The difference between the obtained weight and the initial weight was determined to determine the average plate on one side. The amount of thickness reduction was determined. When this average thickness reduction amount was 14 ⁇ m or less, it was evaluated that the weather resistance was excellent.
  • the weldability of the test piece was evaluated.
  • a y-slit weld cracking test is performed to check the cold cracking susceptibility of the welded portion, and a preheating temperature for prevention of weld cracking (prevention of cracking). )
  • the weld crack prevention preheating temperature was high, it was evaluated that the weldability was poor.
  • Table 2 shows the results of the corrosion test and the weldability evaluation obtained together with the component compositions.
  • steel types No. 1 to 25 the thickness reduction amount is 11.8 to 13.8 ⁇ m, and it has excellent weather resistance.
  • No. 25 has excellent weather resistance
  • Pcm exceeded 0.25% by mass, so the weld crack prevention preheating temperature was as high as 100 ° C., and the weldability was poor.
  • No. 7 is a steel grade No. 7 in which the added amount of Nb or Sn is substantially the same as Cu, Ni, W and contains one of Nb or Sn. Compared with 2 and 5, the weather resistance is remarkably improved.
  • steel type No. 1 containing both Nb and Sn. 8 is significantly more weather resistant than steel types 1 and 4.
  • steel type No. 1 containing both Nb and Sn. 11 and 12 have improved weather resistance compared to steel type 10.
  • the thickness reduction amount is 14.3 to 17.7 ⁇ m, which is greatly inferior in weather resistance compared to the present invention examples.
  • the comparative examples (steel types No. 41 and No. 42) have excellent weather resistance of 14.0 ⁇ m and 12.5 ⁇ m in thickness reduction, but they contain a lot of Ni, so the alloy cost increases. However, the price of steel is high. Comparative steel grade No. Since Pcm exceeded 0.25 mass%, the weld crack prevention preheating temperature was as high as 100 degreeC, and 42 was inferior to weldability.

Abstract

L'invention concerne un acier peu onéreux destiné à des structures, qui possède une excellente résistance aux intempéries, et une structure en acier. En particulier, l'invention concerne un acier destiné à des structures contenant, en % en poids, 0,020 % ou plus mais moins de 0,140 % de C, de 0,05 à 2,00 % (inclus) de Si, de 0,20 à 2,00 % (inclus) de Mn, de 0,005 à 0,030 % (inclus) de P, de 0,0001 à 0,0200 % (inclus) de S, de 0,001 à 0,100 % (inclus) d'Al, de 0,10 à 1,00 % (inclus) de Cu, 0,10 % ou plus mais moins de 0,65 % de Ni et de 0,05 à 1,00 % (inclus) de W, et comprenant en outre de 0,005 à 0,200 % (inclus) de Nb et/ou de 0,005 à 0,200 % (inclus) de Sn, le reste étant constitué de fer et d'impuretés inévitables.
PCT/JP2010/067310 2009-09-30 2010-09-28 Acier pour des structures possédant une excellente résistance aux intempéries et structure en acier WO2011040621A1 (fr)

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US13/498,348 US20120183431A1 (en) 2009-09-30 2010-09-28 Structural steel material and steel structure with high corrosion resistance
CN2010800441019A CN102575327A (zh) 2009-09-30 2010-09-28 耐气候性优异的结构用钢材及钢结构物
EP10820733.3A EP2484790B1 (fr) 2009-09-30 2010-09-28 Acier pour des structures possédant une excellente résistance aux intempéries et structure en acier

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JP6094669B2 (ja) * 2013-05-10 2017-03-15 Ｊｆｅスチール株式会社 溶接構造用鋼材
JP5720867B1 (ja) 2013-08-29 2015-05-20 新日鐵住金株式会社 Ｃｕ−Ｓｎ共存鋼およびその製造方法
EP3067148B1 (fr) * 2013-11-07 2022-09-07 JFE Steel Corporation Procédé de soudage par friction-malaxage pour feuille d'acier à haute résistance
JP6549254B2 (ja) * 2015-05-28 2019-07-24 ポスコＰｏｓｃｏ 硫酸及び塩酸複合耐食性に優れた熱延鋼板及びその製造方法
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CN107557685B (zh) * 2017-08-30 2019-03-26 武汉钢铁有限公司 低温环境下440MPa级船舶用耐蚀钢及其生产方法
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JP7415140B2 (ja) 2019-11-25 2024-01-17 日本製鉄株式会社 鋼材
JP7192824B2 (ja) * 2020-03-31 2022-12-20 Ｊｆｅスチール株式会社 耐火性および塗装耐食性に優れた構造用鋼材および構造物
CN112593158B (zh) * 2020-12-11 2021-11-30 湖南华菱涟源钢铁有限公司 690MPa耐低温超高强耐候钢板及制备方法

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US10602057B1 (en) 2014-07-07 2020-03-24 Snap Inc. Supplying content aware photo filters

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EP2484790A1 (fr) 2012-08-08
EP2484790B1 (fr) 2018-05-23
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JP2012067377A (ja) 2012-04-05
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