JP2002053929A - Highly weather resistance steel - Google Patents
Highly weather resistance steelInfo
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- JP2002053929A JP2002053929A JP2000235474A JP2000235474A JP2002053929A JP 2002053929 A JP2002053929 A JP 2002053929A JP 2000235474 A JP2000235474 A JP 2000235474A JP 2000235474 A JP2000235474 A JP 2000235474A JP 2002053929 A JP2002053929 A JP 2002053929A
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、耐候性鋼材に係わ
り、とくに海浜地域など塩分の多い環境で使用可能な海
浜耐候性に優れた鋼材に関する。ここでいう海浜耐候性
とは、海浜地域の大気中で使用した場合の耐候性をい
う。なお、本発明でいう鋼材は、厚鋼板、薄鋼板、棒
鋼、形鋼等を含むものとする。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weather-resistant steel material, and more particularly to a steel material having excellent beach weather resistance which can be used in a salty environment such as a beach area. The term “shore weather resistance” as used herein refers to weather resistance when used in the air in a beach area. In addition, the steel material referred to in the present invention includes a thick steel plate, a thin steel plate, a bar steel, a shaped steel, and the like.
【０００２】[0002]
【従来の技術】鋼中に、Ｐ，Cu，Cr，Ni等の合金元素を
添加し大気中における耐食性を向上させた耐候性鋼は、
橋梁等の構造物に広く利用されている。耐候性鋼は、屋
外において腐食の原因である酸素、水を通しにくい安定
さびと呼ばれるさびを数年で形成し、その後の腐食を抑
制している。このため、耐候性鋼は防錆塗料の塗布が不
要であり、いわゆる裸使用が可能な安価な高耐食性材料
である。2. Description of the Related Art Weather-resistant steels having improved corrosion resistance in the atmosphere by adding alloying elements such as P, Cu, Cr, Ni, etc. to steels,
Widely used for structures such as bridges. Weather-resistant steel forms a rust called stable rust, which is hard to penetrate oxygen and water, which cause corrosion outdoors, in a few years, and suppresses subsequent corrosion. For this reason, the weather-resistant steel does not need to be coated with a rust-preventive paint, and is a so-called inexpensive and highly corrosion-resistant material that can be used naked.
【０００３】一方、近年、建設省から耐候性鋼の適用指
針（「耐候性鋼の橋梁への適用に関する共同研究報告著
（ＸＸ）」、1993.3, 建設省土木研究所、（社）鋼材倶
楽部、（社）日本橋梁建設協会発行）が公表され、飛来
塩分量が0.05mg/dm2/day以上の地域、すなわち海浜地域
では、従来の耐候性鋼（JIS G 3114：溶接構造用耐候性
熱間圧延鋼材）は無塗装で使用できないことになってい
る。[0003] On the other hand, in recent years, a guideline for applying weather resistant steel from the Ministry of Construction (“Joint Research Report on Application of Weather Resistant Steel to Bridges (XX)”, 1993.3, Ministry of Construction, Public Works Research Institute, Steel Club, Published by the Japan Bridge Construction Association), in areas where the amount of incoming salt is 0.05 mg / dm 2 / day or more, that is, in coastal areas, conventional weathering steel (JIS G 3114: weathering hot for welded structures) Rolled steel) cannot be used without painting.
【０００４】したがって、海浜地域などの塩分の多い環
境下では、普通鋼材にフタル酸樹脂、塩化ゴム、タール
エポキシ樹脂等の塗装を行って対処している。しかしな
がら、河口付近の海浜地域に建設される橋梁は腐食が著
しく再塗装の要求が高いが、長大橋が多く、しかも再塗
装作業が困難な場合が多い。このようなことから、依然
として無塗装で使用できる鋼材への要望が高い。[0004] Therefore, in a salty environment such as a beach area, a measure is taken by coating a common steel material with a phthalic acid resin, a chlorinated rubber, a tar epoxy resin or the like. However, bridges constructed near the estuary are strongly corroded and require high repainting, but there are many long bridges and repainting is often difficult. For these reasons, there is still a high demand for steel materials that can be used without painting.
【０００５】さらに、海岸地帯といっても、場所により
飛来する塩分量は大きく相違する。鋼材の腐食は飛来塩
分量が多くなるにしたがい激しくなるため、耐食性と経
済性の観点からは、飛来塩分量に応じた耐候性鋼材が必
要となる。また、橋梁といっても、使用される場所によ
り鋼材の腐食環境は同一とは限らない。たとえば、桁外
部では、降雨、結露水および日照に曝される。一方、桁
内部では、結露水のみに曝され雨掛かりはない。一般
に、飛来塩分量が多い環境では、桁外部より桁内部の方
が腐食が激しいと言われている。[0005] Further, even in the coastal zone, the amount of salt coming in varies greatly depending on the location. Corrosion of the steel material becomes more severe as the amount of incoming salt increases, and therefore, from the viewpoint of corrosion resistance and economy, weather-resistant steel materials corresponding to the amount of incoming salt are required. In addition, even if it is a bridge, the corrosion environment of steel materials is not always the same depending on the place where it is used. For example, outside the girder, it is exposed to rain, dew condensation, and sunshine. On the other hand, the inside of the girder is exposed only to dew condensation water and there is no rainfall. Generally, in an environment where the amount of incoming salt is large, it is said that corrosion inside the girder is more severe than outside the girder.
【０００６】このような問題に対し、例えば特開平６−
136557号公報には、硫酸クロム水溶液あるいは硫酸銅水
溶液を塗布し、水分乾燥後さらに有機樹脂被覆を行う鋼
材の表面処理方法が提案されている。さらに、特開平８
−13158 号公報には、アルミニウムイオンを含む水溶液
を塗布し、水分乾燥後さらに有機樹脂被膜を形成する鋼
材の表面処理方法が提案されている。しかしながら、特
開平６−136557号公報および特開平８−13158 号公報に
記載された技術では、安定さびが短期間で形成される
が、工程が複雑であるうえ使用する表面処理剤が高価で
あるなどの問題を残しており、表面処理を必要としない
耐候性鋼材の開発が要望されていた。To solve such a problem, see, for example,
Japanese Patent Publication No. 136557 proposes a method for surface treatment of a steel material in which an aqueous solution of chromium sulfate or an aqueous solution of copper sulfate is applied, dried with water, and further coated with an organic resin. Further, Japanese Unexamined Patent Application Publication No.
Japanese Patent Application No. -13158 proposes a method for surface treatment of steel materials in which an aqueous solution containing aluminum ions is applied, and after moisture drying, an organic resin film is formed. However, in the techniques described in JP-A-6-136557 and JP-A-8-13158, stable rust is formed in a short period of time, but the process is complicated and the surface treatment agent used is expensive. Therefore, development of a weather-resistant steel material that does not require surface treatment has been demanded.
【０００７】この点、特開昭63−255341号公報には、耐
塩害性に優れた溶接構造用耐食性鋼板が提案されてい
る。この鋼板は、Ｐ：0.04〜0.15wt％、Cu：0.1 〜0.5w
t ％、Cr：３〜10wt％、Al：0.02〜1.0wt ％含有し、海
塩粒子が関与する腐食環境下でも無塗装使用に耐え得る
とされている。しかし、この鋼板は、Ｐ含有量が高く靱
性の低下、溶接性の低下が大きいという問題があった。In this respect, Japanese Patent Application Laid-Open No. 63-255341 proposes a corrosion-resistant steel sheet for welded structures having excellent salt damage resistance. This steel sheet has a P: 0.04 to 0.15 wt%, Cu: 0.1 to 0.5 w
It contains t%, Cr: 3-10 wt%, and Al: 0.02-1.0 wt%, and is said to be able to withstand unpainted use even in a corrosive environment involving sea salt particles. However, this steel sheet has a problem that the P content is high and the toughness and weldability are greatly reduced.
【０００８】また、特開平３−158436号公報には、海浜
耐候性構造用鋼が提案され、この鋼は、Ｐを多量添加す
ることなく、Mn、Cu、Cr、Ni、Moの含有量を調整するこ
とにより海浜地帯で優れた耐候性を示し、鋼板への塗装
を省略できるとされている。しかし、この鋼は、Crの含
有量が高く、靱性、溶接性の低下という問題が残されて
いた。Japanese Unexamined Patent Publication (Kokai) No. 3-158436 proposes a seaside weathering structural steel which can reduce the content of Mn, Cu, Cr, Ni, and Mo without adding a large amount of P. It is said that by adjusting it, it shows excellent weather resistance in the beach area, and it is possible to omit painting on steel plates. However, this steel has a high Cr content, and there remains a problem that toughness and weldability are reduced.
【０００９】また、特開平10-251797 号公報には、Ｃ：
0.15％以下、Si：0.7 ％以下、Mn：0.2 〜1.5 ％、Ｐ：
0.03〜0.15％、Ｓ：0.02％以下、Al：0.01〜0.1 ％、C
r：0.1 ％以下、Ni：0.4 〜４％、Cu：0.4 ％以下、M
o：0.05〜１％と、さらにSn：0.01〜0.5 ％、Sb：0.01
〜３％のうちの１種または２種を含有する、0.05mg/dm2
/day以上10mg/dm2/day未満の塩分が飛来する環境におい
て高い耐候性を有する溶接構造用鋼が提案されている。
しかし、特開平10-251797 号公報に記載された鋼は、強
度確保のためにＣを比較的高く含有し、さらに強度向上
と耐食性確保のために、Ｐを0.03％以上含有しており、
靱性、溶接性に難点がある。Japanese Patent Application Laid-Open No. 10-251797 discloses that C:
0.15% or less, Si: 0.7% or less, Mn: 0.2 to 1.5%, P:
0.03 to 0.15%, S: 0.02% or less, Al: 0.01 to 0.1%, C
r: 0.1% or less, Ni: 0.4 to 4%, Cu: 0.4% or less, M
o: 0.05 to 1%, Sn: 0.01 to 0.5%, Sb: 0.01
0.05 mg / dm 2 containing one or two of 〜3%
A welded structural steel having high weather resistance in an environment where salt content of not less than / day and less than 10 mg / dm 2 / day comes has been proposed.
However, the steel described in Japanese Patent Application Laid-Open No. 10-251797 contains a relatively high amount of C for securing strength, and further contains 0.03% or more of P for improving strength and ensuring corrosion resistance.
Difficulties in toughness and weldability.
【００１０】[0010]
【発明が解決しようとする課題】本発明は、上記した従
来技術の問題に鑑み、海浜地域などの塩分が多く、雨掛
かりがない環境下でも、靱性および溶接性を損なわずに
優れた海浜耐候性を保持し、塗装、表面処理などを必要
としない海浜耐候性に優れた高耐候性鋼材を提供するこ
とを目的とする。SUMMARY OF THE INVENTION In view of the above-mentioned problems of the prior art, the present invention provides an excellent beach weather resistance without impairing the toughness and weldability even in an environment with a lot of salt such as a beach area and no rain. It is an object of the present invention to provide a highly weather-resistant steel material having excellent beach weather resistance, which maintains the properties and does not require painting, surface treatment, and the like.
【００１１】[0011]
【課題を解決するための手段】本発明者らは、上記した
課題を達成するために、耐候性鋼材に形成されるさび層
について鋭意研究した。その結果、本発明者らは、耐候
性鋼材に形成されるさび層について、つぎのような知見
を得た。耐候性鋼材の初期にできるさび層はγ−FeOOH
やFe3O4 が主体である。数年の乾湿繰り返し腐食反応に
よって、さび層はγ−FeOOH やFe3O4 が減少し、Ｘ線回
折レベルでの非晶質さびが主体となる。また、このさび
層はTEM （透過型電子顕微鏡）観察レベルでも結晶系を
特定できない非晶質さびが多くを占め、このような状態
のさびとすることが耐候性の点で好ましい。Means for Solving the Problems In order to achieve the above-mentioned object, the present inventors have intensively studied a rust layer formed on a weather-resistant steel material. As a result, the present inventors have obtained the following knowledge about the rust layer formed on the weathering steel. The rust layer formed at the beginning of weathering steel is γ-FeOOH
And Fe 3 O 4 are the main components. The rust layer is reduced by γ-FeOOH and Fe 3 O 4 due to repeated wet and dry corrosion reactions for several years, and the rust layer is mainly composed of amorphous rust at the X-ray diffraction level. The rust layer is mainly composed of amorphous rust whose crystal system cannot be specified even at a TEM (transmission electron microscope) observation level, and such a rust layer is preferably used in view of weather resistance.
【００１２】しかしながら、海浜地域で暴露された耐候
性鋼材に形成されるさび層では、さび粒子として、TEM
観察レベルで笹状のγ−FeOOH あるいはα−FeOOH が主
体となっている。これら笹状のさび粒子の形成は、さび
層に空隙を生成するため、さび層が水、酸素、Clイオン
を通し易い構造となる。したがって、海浜耐候性を改善
するためには、これら笹状のさび粒子の形成を抑制した
さび層とすることが肝要であることを知見した。However, in a rust layer formed on a weather-resistant steel material exposed in a beach area, TEM particles are used as rust particles.
At the observation level, γ-FeOOH or α-FeOOH in the shape of bamboo is predominant. The formation of these bamboo-like rust particles creates voids in the rust layer, so that the rust layer has a structure that allows easy passage of water, oxygen, and Cl ions. Therefore, it was found that it is important to form a rust layer in which the formation of these bamboo-like rust particles is suppressed in order to improve the beach weatherability.
【００１３】そこで、本発明者らは、笹状のさび粒子の
形成を抑制する方策について鋭意研究した。その結果、
鋼中にSbを添加することによって、笹状のさび粒子の形
成が抑制され、TEM 観察レベルでも非晶質さび主体のさ
び層となることを見いだした。また、本発明者らは、Ｃ
含有量を極低炭素域に低減し、さらにＰ含有量を0.030
％以下、好ましくは0.025 ％未満と低Ｐ化することによ
り、耐候性鋼材の溶接性、とくに大入熱溶接における溶
接性が顕著に改善されるという新規な知見を得た。Therefore, the present inventors have made intensive studies on measures to suppress the formation of rust-like rust particles. as a result,
We found that the addition of Sb to steel suppressed the formation of bamboo-like rust particles and resulted in an amorphous rust-based rust layer even at the TEM observation level. In addition, the present inventors
Reduce the content to an extremely low carbon range, and further reduce the P content to 0.030
%, Preferably less than 0.025%, a new finding is obtained that the weldability of weathering steel, especially in large heat input welding, is significantly improved.
【００１４】本発明は、上記した知見に基づき、さらに
検討を加えて完成されたものである。すなわち、本発明
は、質量％で、Ｃ：0.001 〜0.025 ％、Si：0.60％以
下、Mn：0.1 〜3.0 ％、Ｐ：0.005 〜0.030 ％、Ｓ：0.
01％以下、Al：0.10％以下、Cu：0.1 〜1.5 ％、Ni：0.
1 〜6.0 ％、Sb：0.005 〜1.0 ％を含み、残部Fe及び不
可避的不純物からなる組成を有することを特徴とする高
耐候性鋼材である。The present invention has been completed based on the above findings and further studies. That is, in the present invention, C: 0.001 to 0.025%, Si: 0.60% or less, Mn: 0.1 to 3.0%, P: 0.005 to 0.030%, S: 0.
01% or less, Al: 0.10% or less, Cu: 0.1 to 1.5%, Ni: 0.
A highly weatherable steel material containing 1 to 6.0% and Sb: 0.005 to 1.0%, and having a composition of balance Fe and inevitable impurities.
【００１５】また、本発明では、前記組成に加えてさら
に、質量％で、Mo：0.005 〜0.5 ％、Ｗ：0.005 〜1.0
％、Co：0.005 〜1.0 ％のうちから選ばれた１種または
２種以上を含有することが好ましく、また本発明では、
前記各組成に加えてさらに、質量％で、Nb：0.005 〜0.
20％、Ti：0.005 〜0.20％、Ｖ：0.005 〜0.20％、Ｂ：
0.0001〜0.0050％のうちから選ばれた１種または２種以
上を含有することが好ましく、また、本発明では、前記
各組成に加えてさらに、質量％で、REM ：0.02％以下、
Ca：0.02％以下のうちから選ばれた１種または２種を含
有することが好ましい。In the present invention, in addition to the above composition, Mo: 0.005 to 0.5%, W: 0.005 to 1.0 in mass%.
%, Co: preferably contains one or more selected from 0.005 to 1.0%.
In addition to each of the above compositions, Nb: 0.005 to 0.5% by mass.
20%, Ti: 0.005 to 0.20%, V: 0.005 to 0.20%, B:
It is preferable to contain one or more selected from 0.0001 to 0.0050%. In the present invention, REM: 0.02% or less by mass% in addition to each of the above-mentioned compositions.
It is preferable to contain one or two kinds selected from Ca: 0.02% or less.
【００１６】[0016]
【発明の実施の形態】本発明鋼材の成分限定理由につい
て説明する。以下、質量％は単に％と記す。 Ｃ：0.001 〜0.025 ％ Ｃは、強度を増加する元素であり、所望の強度を確保す
るためには、0.001 ％以上の含有を必要とするが、0.02
5 ％を超えて含有すると、靱性、溶接性が劣化する。そ
こで、Ｃは0.001 〜0.025 ％の範囲に限定した。DESCRIPTION OF THE PREFERRED EMBODIMENTS The reasons for limiting the components of the steel material of the present invention will be described. Hereinafter, mass% is simply described as%. C: 0.001% to 0.025% C is an element that increases the strength. To secure the desired strength, the content of 0.001% or more is required.
If the content exceeds 5%, toughness and weldability deteriorate. Therefore, C is limited to the range of 0.001 to 0.025%.
【００１７】Si：0.60％以下 Siは、脱酸剤として作用し、さらに鋼の強度を増加させ
る元素であるが、0.60％を超えて多量に含有すると、靱
性および溶接性を劣化させる。このため、Siは0.60％以
下に限定した。なお、好ましくは0.10〜0.30％である。 Mn：0.1 〜3.0 ％ Mnは、鋼の強度および靱性の増加に大きく寄与する元素
であり、所望の強度を確保するために、本発明では0.1
％以上の含有を必要とするが、3.0 ％を超えて多量に含
有すると靱性、溶接性に悪影響を及ぼす。このため、Mn
は0.1 〜3.0 ％の範囲に限定した。なお、寒冷地等で高
靱性が要求される場合には、低Mn化が効果的であり、0.
10〜0.50％とするのが好ましい。Si: 0.60% or less Si is an element which acts as a deoxidizing agent and further increases the strength of steel. However, if contained in a large amount exceeding 0.60%, toughness and weldability are deteriorated. For this reason, Si was limited to 0.60% or less. In addition, it is preferably 0.10 to 0.30%. Mn: 0.1 to 3.0% Mn is an element that greatly contributes to the increase in strength and toughness of steel. In order to secure a desired strength, in the present invention, Mn is 0.1 to 3.0%.
% Or more is required, but a large amount exceeding 3.0% adversely affects toughness and weldability. For this reason, Mn
Was limited to the range of 0.1 to 3.0%. In the case where high toughness is required in a cold region or the like, lowering the Mn content is effective.
It is preferably set to 10 to 0.50%.
【００１８】Ｐ：0.005 〜0.030 ％ Ｐは、さび粒子を緻密化し耐候性を向上させる元素であ
り、本発明では0.005％以上の含有を必要とする。しか
し、0.030 ％を超えて含有すると、溶接性が顕著に劣化
する。このため、Ｐは0.005 〜0.030 ％の範囲に限定し
た。本発明では、Ｃ含有量を極低炭素域に低減し、さら
にＰ含有量を0.030 ％以下、好ましくは0.025 ％未満と
低Ｐとすることにより、大入熱溶接における溶接性が顕
著に改善される。なお、好ましくは0.005 〜0.020 ％で
ある。P: 0.005 to 0.030% P is an element that densifies rust particles and improves weather resistance. In the present invention, the content of 0.005% or more is required. However, when the content exceeds 0.030%, the weldability is significantly deteriorated. Therefore, P is limited to the range of 0.005 to 0.030%. In the present invention, the weldability in large heat input welding is remarkably improved by reducing the C content to an extremely low carbon region and further reducing the P content to 0.030% or less, preferably less than 0.025%. You. The content is preferably 0.005 to 0.020%.
【００１９】Ｓ：0.01％以下 Ｓは、耐候性を劣化させ、さらに溶接性、靱性を劣化さ
せるため、本発明では、Ｓはできるだけ低減するのが好
ましいが、0.01％までは許容できる。なお、好ましくは
0.005 ％以下である。 Al：0.10％以下 Alは、脱酸剤として添加するが、0.10％を超えて含有す
ると溶接性に悪影響を及ぼす。このため、Alは0.10％を
上限とした。なお、好ましくは0.010 〜0.050％であ
る。S: 0.01% or less S deteriorates weather resistance and further deteriorates weldability and toughness. Therefore, in the present invention, S is preferably reduced as much as possible, but up to 0.01% is acceptable. Preferably,
0.005% or less. Al: 0.10% or less Al is added as a deoxidizing agent, but if it exceeds 0.10%, it adversely affects weldability. Therefore, the upper limit of Al content is 0.10%. Incidentally, the content is preferably 0.010 to 0.050%.
【００２０】Cu：0.1 〜1.5 ％ Cuは、さび粒子を緻密化し耐候性を向上させる元素であ
り、本発明では0.1 ％以上の含有を必要とする。一方、
1.5 ％を超えて含有すると、熱間加工性を阻害するとと
もに、耐候性向上の効果も飽和し、含有量に見合う効果
が期待できず、経済的に不利となる。このため、Cuは0.
1 〜1.5 ％の範囲に限定した。なお、好ましくは0.10〜
0.60％である。Cu: 0.1-1.5% Cu is an element that densifies rust particles and improves weather resistance. In the present invention, the content of 0.1% or more is required. on the other hand,
When the content exceeds 1.5%, the hot workability is impaired, and the effect of improving the weather resistance is saturated, and an effect commensurate with the content cannot be expected, which is economically disadvantageous. Therefore, Cu is 0.
Limited to the range of 1-1.5%. In addition, preferably 0.10 ~
0.60%.
【００２１】Ni：0.1 〜6.0 ％ Niは、さび粒子を緻密化し耐候性を向上させる元素であ
り、本発明では、0.1％以上の含有を必要とする。一
方、6.0 ％を超えて含有しても、効果が飽和し含有量に
見合う効果が期待できず、経済的に不利となる。このた
め、Niは0.1 〜6.0 ％の範囲とした。なお、飛来塩分量
が多い場合には、2.0 ％以上とするのが好ましく、飛来
塩分量が少ない場合には2.0 ％未満とするのが好まし
い。Ni: 0.1 to 6.0% Ni is an element that densifies rust particles and improves weather resistance. In the present invention, the content of 0.1% or more is required. On the other hand, if the content exceeds 6.0%, the effect saturates and an effect commensurate with the content cannot be expected, which is economically disadvantageous. Therefore, Ni is set in the range of 0.1 to 6.0%. When the amount of incoming salt is large, the content is preferably 2.0% or more. When the amount of incoming salt is small, the content is preferably less than 2.0%.
【００２２】Sb：0.005 〜1.0 ％ 本発明では、最も重要な元素である。Sbは、さび層で、
笹状のさび粒子の形成を抑制し、さび層を非晶質さび主
体とする効果を有する。このような効果は、0.005 ％以
上の含有で認められるが、1.0 ％を超えて含有しても、
効果が飽和し含有量に見合う効果が認められない。この
ため、Sbは0.005 〜1.0 ％の範囲に限定した。なお、好
ましくは0.005 〜0.7 ％である。Sb: 0.005 to 1.0% Sb is the most important element in the present invention. Sb is a rust layer,
It has the effect of suppressing the formation of rust-like rust particles and making the rust layer mainly composed of amorphous rust. Such an effect is recognized at a content of 0.005% or more, but even when the content exceeds 1.0%,
The effect is saturated and no effect commensurate with the content is observed. Therefore, Sb is limited to the range of 0.005 to 1.0%. Incidentally, the content is preferably 0.005 to 0.7%.
【００２３】Mo：0.005 〜0.5 ％、Ｗ：0.005 〜1.0
％、Co：0.005 〜1.0 ％のうちから選ばれた１種または
２種以上 Mo、Ｗ、Coはいずれも、耐候性を向上させる元素であ
り、必要に応じ１種または２種以上を選択して含有でき
る。 Mo：0.005 〜0.5 ％ Moは、耐候性を向上させ、さらに強度を増加させる元素
であるが、0.005 ％未満の含有ではその効果が少ない。
一方、0.5 ％を超えて含有しても効果が飽和し含有量に
見合う効果が認められず、経済的に不利となる。このた
め、Moは0.005〜0.5 ％の範囲に限定するのが好まし
い。なお、靱性の観点から、0.005 〜0.35％の範囲とす
るのがより好ましい。Mo: 0.005 to 0.5%, W: 0.005 to 1.0
%, Co: one or two or more selected from 0.005 to 1.0% Mo, W, and Co are elements that improve the weather resistance, and one or two or more are selected as necessary. Can be contained. Mo: 0.005 to 0.5% Mo is an element which improves the weather resistance and further increases the strength, but the effect is small when the content is less than 0.005%.
On the other hand, if the content exceeds 0.5%, the effect is saturated and no effect commensurate with the content is recognized, which is economically disadvantageous. For this reason, Mo is preferably limited to the range of 0.005 to 0.5%. From the viewpoint of toughness, the content is more preferably in the range of 0.005 to 0.35%.
【００２４】Ｗ：0.005 〜1.0 ％ Ｗは、耐候性を向上させ、さらに強度を増加させる元素
であるが、0.005 ％未満の含有ではその効果が少ない。
一方、1.0 ％を超えて含有しても効果が飽和し含有量に
見合う効果が認められず、経済的に不利となる。このた
め、Ｗは0.005〜1.0 ％の範囲に限定するのが好まし
い。なお、経済性の観点から、0.005 〜0.6 ％の範囲と
するのがより好ましい。W: 0.005 to 1.0% W is an element which improves the weather resistance and further increases the strength, but the effect is small when the content is less than 0.005%.
On the other hand, if the content exceeds 1.0%, the effect saturates and no effect commensurate with the content is recognized, which is economically disadvantageous. For this reason, W is preferably limited to the range of 0.005 to 1.0%. From the viewpoint of economy, the content is more preferably in the range of 0.005 to 0.6%.
【００２５】Co：0.005 〜1.0 ％ Coは、耐候性を向上させる元素であるが、0.005 ％未満
の含有ではその効果が少ない。一方、1.0 ％を超えて含
有しても効果が飽和し含有量に見合う効果が認められ
ず、経済的に不利となる。このため、Coは0.005 〜1.0
％の範囲に限定するのが好ましい。なお、経済性の観点
から、0.005 〜0.6 ％の範囲とするのがより好ましい。Co: 0.005 to 1.0% Co is an element that improves the weather resistance, but its effect is small when the content is less than 0.005%. On the other hand, if the content exceeds 1.0%, the effect saturates and no effect commensurate with the content is recognized, which is economically disadvantageous. Therefore, Co is 0.005 to 1.0
% Is preferable. From the viewpoint of economy, the content is more preferably in the range of 0.005 to 0.6%.
【００２６】Nb：0.005 〜0.20％、Ti：0.005 〜0.20
％、Ｖ：0.005 〜0.20％、Ｂ：0.0001〜0.0050％のうち
から選ばれた１種または２種以上 Nb、Ti、Ｖ、Ｂは、鋼材の強度を増加させる元素であ
り、必要に応じ１種または２種以上を含有できる。Nb、
Ti、Ｖは、いずれも0.005 ％以上の含有で、Ｂは、0.00
01％以上の含有で効果が認められるが、Nb、Ti、Ｖはそ
れぞれ0.20％を超えて、Ｂは0.0050％を超えて含有して
も効果が飽和し、含有量に見合う効果が期待できなくな
り、経済的に不利となる。このため、Nb、Ti、Ｖはいず
れも0.005 ％〜0.20％、Ｂは0.0001〜0.0050％の範囲に
限定するのが好ましい。Nb: 0.005 to 0.20%, Ti: 0.005 to 0.20
%, V: 0.005 to 0.20%, and B: 0.0001 to 0.0050% Nb, Ti, V, and B are elements that increase the strength of the steel material. It may contain one or more species. Nb,
Ti and V each contain 0.005% or more, and B contains 0.005% or more.
The effect is recognized at the content of 01% or more, but the effect is saturated even if the content of Nb, Ti, and V exceeds 0.20%, and the content of B exceeds 0.0050%, and the effect corresponding to the content cannot be expected. At an economic disadvantage. Therefore, it is preferable that Nb, Ti, and V are all limited to the range of 0.005% to 0.20%, and B is limited to the range of 0.0001 to 0.0050%.
【００２７】REM ：0.02％以下、Ca：0.02％以下のうち
から選ばれた１種または２種 REM 、Caは、溶接性を向上させる元素であり、必要に応
じ選択して含有できる。このような効果は、REM 0.001
％以上、Ca0.001 ％以上の含有で顕著に認められるよう
になるが、REM 、Caとも0.02％を超える多量の含有は、
鋼材の清浄度を劣化させる。このため、REM ：0.02％以
下、Ca：0.02％以下の限定するのが好ましい。One or two kinds of REM and Ca selected from REM: 0.02% or less and Ca: 0.02% or less are elements that improve weldability, and can be selectively contained as necessary. Such an effect has a REM of 0.001
% And Ca 0.001% or more, but the content of REM and Ca in excess of 0.02% is large.
Deterioration of the cleanliness of steel. For this reason, it is preferable to limit REM: 0.02% or less and Ca: 0.02% or less.
【００２８】上記した成分以外の残部は、Fe及び不可避
的不純物である。不可避的不純物として、Cr：0.05％以
下、Ｎ：0.010 ％以下、Ｏ：0.010 ％以下が許容でき
る。Crは、耐候性を向上させる元素といわれてきたが、
耐候性を向上させるのは、塩分の少ない環境下における
場合であり、本発明が目的とする海浜地域のような塩分
の多い環境では、逆に耐候性を劣化させる元素である。
このため、本発明では敢えて添加しないが、0.05％まで
は許容できる。The balance other than the above components is Fe and inevitable impurities. As inevitable impurities, Cr: 0.05% or less, N: 0.010% or less, and O: 0.010% or less are acceptable. Cr has been said to be an element that improves weather resistance,
The element that improves the weather resistance is in an environment with a low salt content, and is an element that deteriorates the weather resistance in an environment with a high salt content such as a beach area, which is the object of the present invention.
For this reason, it is not intentionally added in the present invention, but up to 0.05% is acceptable.
【００２９】本発明鋼材は、転炉、電気炉等、通常公知
の溶製方法で溶製され、連続鋳造法あるいは造塊法によ
り鋼素材とされる。また、溶製方法は、真空脱ガス精錬
等を実施してもよい。ついで、これら鋼素材は、加熱炉
等で加熱され、あるいは加熱なしで直接、熱間圧延によ
り所望の形状に圧延される。The steel material of the present invention is smelted by a commonly known smelting method such as a converter or an electric furnace, and is made into a steel material by a continuous casting method or an ingot-making method. In addition, the smelting method may be vacuum degassing refining or the like. Next, these steel materials are heated in a heating furnace or the like, or are directly rolled into a desired shape by hot rolling without heating.
【００３０】[0030]
【実施例】表１に示す化学成分の鋼を転炉で溶製し、連
続鋳造法でスラブとした。ついで、これらスラブを加熱
し、熱間圧延により25mm×2500mm幅の厚鋼板とした。こ
れら厚鋼板について、引張特性、靱性および溶接性を調
査した。引張特性は、各厚鋼板の全厚（Ｃ方向）からJI
S 4 号引張試験片を採取し、JIS Z 2241の規定に準拠し
て、降伏強さYS、引張強さTS、伸びElを測定した。EXAMPLES Steel having the chemical composition shown in Table 1 was melted in a converter and made into a slab by a continuous casting method. Next, these slabs were heated and hot-rolled into thick steel plates having a width of 25 mm × 2500 mm. The tensile properties, toughness and weldability of these thick steel plates were investigated. Tensile properties are determined by JI from the total thickness (C direction) of each steel plate.
S4 No. 4 tensile test pieces were sampled, and the yield strength YS, tensile strength TS, and elongation El were measured in accordance with the provisions of JIS Z 2241.
【００３１】靱性は、各厚鋼板の1/2T（Ｃ方向）からJI
S 4 号衝撃試験片を採取し、JIS Z2242の規定に準拠し
て、試験温度−５℃でシャルピー衝撃試験を実施し、吸
収エネルギー vＥ-5を求めた。溶接性は、各厚鋼板から
試験片を採取し、入熱100kJ/cm溶接熱影響部１mm相当の
再現熱サイクルを付与したのち、試験温度−５℃におけ
るシャルピー衝撃試験を実施し、吸収エネルギー vＥ-5
を求めた。The toughness is determined by JI from 1 / 2T (C direction) of each thick steel plate.
The S4 impact test piece was sampled and subjected to a Charpy impact test at a test temperature of −5 ° C. in accordance with the provisions of JIS Z2242 to determine an absorbed energy vE− 5 . Weldability was determined by taking a test piece from each thick steel plate, applying a reproducible heat cycle equivalent to 1 mm of the heat-affected zone at a heat input of 100 kJ / cm, and conducting a Charpy impact test at a test temperature of -5 ° C. -Five
I asked.
【００３２】また、各厚鋼板から、５mm×50mm×100mm
の腐食試験片を採取し、ショットブラスト後、大気暴露
試験に供し、海浜耐候性を評価した。大気暴露試験は、
飛来塩分量0.8mg/dm2/day （JIS Z 2381ガーゼ法により
測定）の海岸地帯を選定し、雨掛かりのない条件で、そ
れぞれ試験片の地鉄面を水平上向きに設置し、１年間暴
露した。暴露試験後、地鉄表面に形成されたさび層を除
去し、試験片の重量減少量を測定し、板厚減少量に換算
した。Also, from each thick steel plate, 5 mm × 50 mm × 100 mm
Was subjected to an air exposure test after shot blasting to evaluate the beach weather resistance. Atmospheric exposure tests
A coastal zone with a flying salt content of 0.8 mg / dm 2 / day (measured by the JIS Z 2381 gauze method) was selected, and the test piece was exposed horizontally for one year, with the ground steel surface of the test piece placed horizontally and without rain. did. After the exposure test, the rust layer formed on the surface of the base iron was removed, the weight loss of the test piece was measured, and the result was converted to the thickness loss.
【００３３】それらの結果を表２に示す。Table 2 shows the results.
【００３４】[0034]
【表１】 [Table 1]
【００３５】[0035]
【表２】 [Table 2]
【００３６】本発明例は、いずれも強度、靱性および溶
接性ともに優れ、かつ板厚減少量が29〜45μｍと、従来
例（鋼板No.12 ）の143 μｍにくらべて著しく減少して
おり、本発明鋼材が優れた耐候性を有していることが分
かる。一方、本発明範囲の下限からSb含有量が外れる比
較例（鋼板 No.８、No.10 ）は、板厚減少量が、それぞ
れ102 、145 μｍと、大きく、耐候性が劣化している。
比較例（鋼板No. ９）は、Sb含有量が1.25％と多いにも
かかわらずSb含有量が0.89％と少ない本発明例（鋼板 N
o.３）と同じ板厚減少量を示し、Sbの効果が本発明範囲
を高く外れると飽和していることを示している。なお、
Ｐ含有量が本発明の範囲を外れて高い比較例（鋼板 No.
11）の板厚減少量は、26μｍと非常に少ない値を示して
いるが、靱性、溶接性が劣化している。All of the examples of the present invention are excellent in strength, toughness and weldability, and the thickness reduction is 29 to 45 μm, which is remarkably reduced compared to the conventional example (steel No. 12) of 143 μm. It turns out that the steel material of the present invention has excellent weather resistance. On the other hand, in the comparative examples (steel sheets No. 8 and No. 10) in which the Sb content deviates from the lower limit of the range of the present invention, the sheet thickness reduction amounts are as large as 102 and 145 μm, respectively, and the weather resistance is deteriorated.
The comparative example (steel sheet No. 9) is an example of the present invention (steel sheet N) in which the Sb content is as low as 0.89% even though the Sb content is as high as 1.25%.
The same thickness reduction as in o.3) is shown, indicating that the effect of Sb is saturated when the effect deviates from the range of the present invention. In addition,
Comparative Example in which the P content is high outside the range of the present invention (steel sheet No.
The thickness reduction of 11) is a very small value of 26 μm, but the toughness and weldability are deteriorated.
【００３７】また、比較例（鋼板No.15 ）は、それぞれ
Ｃ、Ｐが本発明の範囲を外れており、溶接性が劣化して
いる。また、比較例（鋼板No.13 、No.14 ）は、それぞ
れCu、Niが本発明の範囲を外れており、耐候性が劣化し
ている。In the comparative example (steel sheet No. 15), C and P are out of the range of the present invention, and the weldability is deteriorated. In the comparative examples (steel sheets No. 13 and No. 14), Cu and Ni were out of the range of the present invention, and the weather resistance was deteriorated.
【００３８】[0038]
【発明の効果】以上の説明から明らかなごとく、本発明
によれば、海浜地域など塩分が多い環境下で、耐候性を
保持できる耐候性鋼材を提供できる。これら鋼材を橋梁
などの構造物へ適用すると、塗装、表面処理等の省略が
可能となり、保守費用の削減という経済的効果も期待で
き、産業上格段の効果を奏する。As apparent from the above description, according to the present invention, it is possible to provide a weather-resistant steel material capable of maintaining weather resistance in an environment having a high salt content such as a beach area. When these steel materials are applied to structures such as bridges, painting, surface treatment, etc. can be omitted, and the economical effect of reducing maintenance costs can be expected, which is extremely advantageous in industry.
Claims (4)
ることを特徴とする高耐候性鋼材。1. In mass%, C: 0.001 to 0.025%, Si: 0.60% or less, Mn: 0.1 to 3.0%, P: 0.005 to 0.030%, S: 0.01% or less, Al: 0.10% or less, Cu: A highly weather-resistant steel material comprising 0.1 to 1.5%, Ni: 0.1 to 6.0%, and Sb: 0.005 to 1.0%, and having a composition of balance Fe and inevitable impurities.
o：0.005 〜0.5 ％、Ｗ：0.005 〜1.0 ％、Co：0.005
〜1.0 ％のうちから選ばれた１種または２種以上を含有
することを特徴とする請求項１に記載の高耐候性鋼材。2. The composition according to claim 1, further comprising:
o: 0.005 to 0.5%, W: 0.005 to 1.0%, Co: 0.005
The highly weather-resistant steel material according to claim 1, wherein the steel material contains one or more selected from a range of 1.0% to 1.0%.
b：0.005 〜0.20％、Ti：0.005 〜0.20％、Ｖ：0.005
〜0.20％、Ｂ：0.0001〜0.0050％のうちから選ばれた１
種または２種以上を含有することを特徴とする請求項１
または２に記載の高耐候性鋼材。3. The composition according to claim 1, further comprising:
b: 0.005 to 0.20%, Ti: 0.005 to 0.20%, V: 0.005
~ 0.20%, B: 0.0001 ~ 0.0050%
2. The composition according to claim 1, wherein said composition contains at least one species.
Or the highly weather-resistant steel material according to 2.
M ：0.02％以下、Ca：0.02％以下のうちから選ばれた１
種または２種を含有することを特徴とする請求項１ない
し３のいずれかに記載の高耐候性鋼材。4. The composition according to claim 1, further comprising:
1 selected from M: 0.02% or less, Ca: 0.02% or less
The highly weather-resistant steel material according to any one of claims 1 to 3, wherein the steel material contains one or two kinds.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004360064A (en) * | 2003-05-15 | 2004-12-24 | Sumitomo Metal Ind Ltd | Steel material superior in beach weather resistance, and structure using it |
| JP2006118011A (en) * | 2004-10-22 | 2006-05-11 | Sumitomo Metal Ind Ltd | Steel having excellent seaside weather resistance and structure |
| JP2007302970A (en) * | 2006-05-12 | 2007-11-22 | Nhk Spring Co Ltd | Steel material with film having excellent corrosion resistance and corrosion fatigue resistance, and its production method |
| WO2008062985A1 (en) * | 2006-11-21 | 2008-05-29 | Posco | Cold rolled steel sheet having excellent in-plane anisotropy and workability and method of manufacturing the same |
| JP2013028852A (en) * | 2011-07-29 | 2013-02-07 | Jfe Steel Corp | Marine structure made of steel material |
| CN114774777A (en) * | 2022-03-28 | 2022-07-22 | 包头钢铁（集团）有限责任公司 | Preparation method of rare earth treated weathering structural steel Q355NH |
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| JPH1121623A (en) * | 1997-07-07 | 1999-01-26 | Nkk Corp | Manufacture of steel product for welded structure, having excellent atmospheric corrosion resistance and low yield ratio |
| JPH11315344A (en) * | 1998-04-30 | 1999-11-16 | Kawasaki Steel Corp | High coastal weather resistant steel |
| JP2001164335A (en) * | 1999-12-06 | 2001-06-19 | Nippon Steel Corp | High workability and good weldability sulfuric acid dew point corrosion resistant steel sheet |
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| JPS5479115A (en) * | 1977-12-07 | 1979-06-23 | Nippon Steel Corp | Steel for corrosion resistant expanded metal |
| JPS56139655A (en) * | 1980-04-01 | 1981-10-31 | Nippon Steel Corp | Low alloy steel with pitting corrosion resistance |
| JPH0925536A (en) * | 1995-07-06 | 1997-01-28 | Sumitomo Metal Ind Ltd | Acid dew point corrosion resistant steel |
| JPH10251797A (en) * | 1997-03-10 | 1998-09-22 | Nkk Corp | Steel for welded structure, excellent in atmospheric corrosion resistance and its production |
| JPH1121623A (en) * | 1997-07-07 | 1999-01-26 | Nkk Corp | Manufacture of steel product for welded structure, having excellent atmospheric corrosion resistance and low yield ratio |
| JPH11315344A (en) * | 1998-04-30 | 1999-11-16 | Kawasaki Steel Corp | High coastal weather resistant steel |
| JP2001164335A (en) * | 1999-12-06 | 2001-06-19 | Nippon Steel Corp | High workability and good weldability sulfuric acid dew point corrosion resistant steel sheet |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004360064A (en) * | 2003-05-15 | 2004-12-24 | Sumitomo Metal Ind Ltd | Steel material superior in beach weather resistance, and structure using it |
| JP4677714B2 (en) * | 2003-05-15 | 2011-04-27 | 住友金属工業株式会社 | Steel materials for bridges with excellent beach weather resistance and structures using the same |
| JP2006118011A (en) * | 2004-10-22 | 2006-05-11 | Sumitomo Metal Ind Ltd | Steel having excellent seaside weather resistance and structure |
| JP4586489B2 (en) * | 2004-10-22 | 2010-11-24 | 住友金属工業株式会社 | Steel and structures with excellent beach weather resistance |
| JP2007302970A (en) * | 2006-05-12 | 2007-11-22 | Nhk Spring Co Ltd | Steel material with film having excellent corrosion resistance and corrosion fatigue resistance, and its production method |
| WO2008062985A1 (en) * | 2006-11-21 | 2008-05-29 | Posco | Cold rolled steel sheet having excellent in-plane anisotropy and workability and method of manufacturing the same |
| JP2013028852A (en) * | 2011-07-29 | 2013-02-07 | Jfe Steel Corp | Marine structure made of steel material |
| CN114774777A (en) * | 2022-03-28 | 2022-07-22 | 包头钢铁（集团）有限责任公司 | Preparation method of rare earth treated weathering structural steel Q355NH |
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