JP2500947B2 - Manufacturing method of high strength steel wire for suspension structure - Google Patents
Manufacturing method of high strength steel wire for suspension structureInfo
- Publication number
- JP2500947B2 JP2500947B2 JP852491A JP852491A JP2500947B2 JP 2500947 B2 JP2500947 B2 JP 2500947B2 JP 852491 A JP852491 A JP 852491A JP 852491 A JP852491 A JP 852491A JP 2500947 B2 JP2500947 B2 JP 2500947B2
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- Prior art keywords
- steel wire
- plating
- wire
- strength
- hot
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Description
【発明の詳細な説明】Detailed Description of the Invention
【０００１】[0001]
【産業上の利用分野】本発明は、吊橋、斜張橋等の吊構
造に使用される耐食性、直線性、ならびに耐クリープ性
に優れた引張強さ２００ｋｇｆ／ｍｍ2以上の高強度鋼
線の製造方法に関する。BACKGROUND OF THE INVENTION The present invention relates to a high strength steel wire having a tensile strength of 200 kgf / mm 2 or more excellent in corrosion resistance, linearity and creep resistance, which is used for a suspension structure such as a suspension bridge and a cable-stayed bridge. It relates to a manufacturing method.
【０００２】[0002]
【従来の技術】吊橋や斜張橋等の吊構造に使用される鋼
線は、通常、ＪＩＳ Ｇ３５０２に規定されるピアノ線
材にパテンティングを行った後、伸線し、その後、溶融
Ｚnめっきを施す方法で製造されている。2. Description of the Related Art A steel wire used for a suspension structure such as a suspension bridge or a cable-stayed bridge is usually formed by patenting a piano wire material specified in JIS G3502, drawing the wire, and then subjecting it to hot-dip Zn plating. It is manufactured by the application method.
【０００３】しかし、近年、橋梁の長大化傾向が進展す
るのにともない、ケーブル（パラレルワイヤストラン
ド、以下、ＰＷＳと称する）の軽量化、すなわち、使用
される鋼線（ＰＷＳワイヤ）の高強度化が要望されるよ
うになった。However, in recent years, along with the tendency of lengthening bridges, the weight of cables (parallel wire strands, hereinafter referred to as PWS) is reduced, that is, the strength of steel wires (PWS wires) used is increased. Has come to be requested.
【０００４】これに対処するため、従来、特開昭６３−
４０１６号公報が開示されている。これは、限定成分の
線材を、ローラーダイス引抜きまたは冷間圧延を行った
後、断面減少率４０％以下の孔ダイス伸線を行って超高
張力鋼線を得る方法である。しかし、この方法では、寸
法精度の厳しい場合には適用が困難であり、また、Ｚn
めっき厚みの不均一が生じるため耐食性が劣化する。In order to deal with this, it has hitherto been disclosed in Japanese Unexamined Patent Publication No. 63-
Japanese Patent No. 4016 is disclosed. This is a method in which a wire rod having a limited component is subjected to roller die drawing or cold rolling, and then hole die wire drawing with a cross-section reduction rate of 40% or less is performed to obtain an ultra-high tensile steel wire. However, this method is difficult to apply when the dimensional accuracy is severe, and Zn
Corrosion resistance deteriorates due to uneven plating thickness.
【０００５】一方、鋼線の耐食性を向上させるために、
従来のＺnめっきに代り各種のＺn−Ａl合金めっきが開
発されている。たとえば、特公昭５５−２６７０２号公
報にはＺn−Ａl、特公昭５４−３３２２３号公報にはＺ
n−Ａl−Ｍg、特公平１−２４２２１号公報にはＺn−Ａ
l−ミッシュメタル、特開昭５６−１１２４５２号公報
にはＺn−Ａl−Ｎaなどが公表されている。これらは、
いずれも従来の溶融Ｚnめっき法と同様、溶融状態(約４
５０℃)の合金めっき浴中に鋼線を浸漬することにより
めっきする方法である。しかし、これらの方法では、め
っき時に伸線加工により強化された鋼線は軟化し、目標
強度が得られない。On the other hand, in order to improve the corrosion resistance of the steel wire,
Various Zn-Al alloy platings have been developed in place of the conventional Zn plating. For example, Japanese Patent Publication No. 55-26702 discloses Zn-Al and Japanese Patent Publication No. 54-33223 discloses Z-Al.
n-Al-Mg, Japanese Patent Publication No. 1-24211 discloses Zn-A.
1-Misch metal, Japanese Patent Laid-Open No. 56-112452 discloses Zn-Al-Na and the like. They are,
Both are in the molten state (about 4
It is a method of plating by immersing a steel wire in an alloy plating bath at 50 ° C. However, with these methods, the steel wire reinforced by the wire drawing process during plating softens, and the target strength cannot be obtained.
【０００６】ケーブル施工上、ＰＷＳワイヤには高い直
線性が要求されているにもかかわらず、従来、溶融めっ
き後に矯正加工を施すことはできなかった。それは、矯
正加工により鋼線の耐クリープ性が劣化し、架設後のケ
ーブルの常温クリープが増大するためである。これを防
止する手段としては、矯正後のめっき鋼線を２５０℃以
上でブルーイングすることが考えられる。しかし、Ｚn
めっき鋼線を２００℃以上の高温にさらすことは、脆い
Ｚn−Ｆe合金層を発達させ、その結果、めっき密着性お
よび耐食性が著しく劣化するため、この方法は実際には
行われていない。[0006] Although high straightness is required for PWS wires in cable construction, it has hitherto been impossible to carry out straightening after hot dipping. This is because the straightening process deteriorates the creep resistance of the steel wire and increases the room temperature creep of the cable after installation. As a means for preventing this, it is considered that the plated steel wire after straightening is blued at 250 ° C. or higher. However, Zn
This method has not been practiced since exposing the coated steel wire to a high temperature of 200 ° C. or higher causes a brittle Zn—Fe alloy layer to develop, resulting in a marked deterioration in plating adhesion and corrosion resistance.
【０００７】[0007]
【発明が解決しようとする課題】以上述べたように、従
来の技術では、耐食性、直線性、ならびに耐クリープ性
に優れた高強度溶融めっき鋼線を製造することは不可能
であった。本発明の目的は、上記従来法の問題点を解決
することにより、従来より高強度のＰＷＳワイヤの製造
方法を提供とすることにある。As described above, it has been impossible to manufacture a high-strength hot-dip galvanized steel wire excellent in corrosion resistance, linearity, and creep resistance by the conventional techniques. An object of the present invention is to provide a method of manufacturing a PWS wire having a higher strength than conventional methods by solving the problems of the conventional methods.
【０００８】[0008]
【課題を解決するための手段および作用】本発明は、重
量比でＣ：０.７５〜１.０％，Ｓi：０.１５〜１.３
％，Ｍn：０.３〜１.０％、必要に応じてＣr：０.１〜
１.０％，Ｖ：０.０２〜０.３０％の１種ないし２種お
よびまたはＡl、Ｔiの１種ないし２種をそれぞれ０.１
％以下含有し、残余をＦeおよび不可避的不純物からな
る鋼線を、重量比でＡlを２〜１２％含有するＺn浴を用
いて溶融めっきしたのち矯正し、その後、２５０〜３７
０℃でブルーイングすることを特徴とする吊構造用高強
度鋼線の製造方法である。According to the present invention, C: 0.75 to 1.0% by weight and Si: 0.15 to 1.3 by weight.
%, Mn: 0.3-1.0%, Cr: 0.1-if necessary
1.0%, V: 0.02 to 0.30% of 1 or 2 kinds and / or Al or Ti of 1 or 2 kinds of 0.1 respectively.
% Or less and the balance of Fe and unavoidable impurities is hot-dipped with a Zn bath containing 2 to 12% by weight of Al and then straightened, and then 250 to 37
It is a method for producing a high-strength steel wire for a hanging structure, which is characterized by bluing at 0 ° C.
【０００９】以下に、本発明を詳細に説明する。はじめ
に、本発明の成分限定理由について説明する。Ｃは強度
を上げるための有効かつ経済的な元素であり、本発明の
最も重要な元素の一つである。Ｃ含有率を上げるに伴
い、パテンティング後の強度ならびに伸線時の加工硬化
量が増大する。したがって、伸線加工により高強度鋼線
を得るためには、Ｃ含有率は高い方が有利であり、本発
明では、０.７５％以上とする。一方、Ｃ含有率が１.０
％を超えた場合、初析セメンタイトの発生防止に特別な
配慮を要するため、Ｃ含有率の上限は１.０％とする。The present invention will be described in detail below. First, the reasons for limiting the components of the present invention will be described. C is an effective and economical element for increasing strength and is one of the most important elements of the present invention. As the C content increases, the strength after patenting and the amount of work hardening during wire drawing increase. Therefore, in order to obtain a high-strength steel wire by wire drawing, a higher C content is advantageous, and in the present invention, it is 0.75% or more. On the other hand, the C content is 1.0
If it exceeds 0.1%, special consideration is required to prevent the occurrence of pro-eutectoid cementite, so the upper limit of the C content is made 1.0%.
【００１０】Ｓiは、脱酸剤として０.１５％以上添加す
る。一方、Ｓiは合金元素としてフェライトに固溶し、
顕著な固溶強化作用を示す。また、フェライト中のＳi
は伸線後の溶融亜鉛めっきやブルーイング工程における
鋼線の強度低下を低減させる効果を有するため、高強度
鋼線の製造には不可欠な元素である。しかし、１.３％
を超えると、めっき後の矯正工程において鋼線の延性が
低下するため、１.３％を上限とする。Si is added as a deoxidizing agent in an amount of 0.15% or more. On the other hand, Si dissolves in ferrite as an alloy element,
It exhibits a remarkable solid solution strengthening effect. In addition, Si in ferrite
Is an essential element for the production of high-strength steel wire because it has the effect of reducing the strength reduction of the steel wire in the hot-dip galvanizing after wire drawing and the bluing process. However, 1.3%
If it exceeds 1.0%, the ductility of the steel wire will deteriorate in the straightening step after plating, so 1.3% is made the upper limit.
【００１１】Ｍnも脱酸剤として０.３％以上添加する。
また、Ｍnは焼入性向上効果が大きいため、線径が大き
い場合には、Ｍn含有率を上げることにより、断面内の
均一性を高めることが可能であり、伸線後の鋼線の延性
向上に有効である。しかし、１.０％を超えると中心偏
析部にマルテンサイトが生成し、伸線加工性が劣化する
ため１.０％を上限とする。Mn is also added as a deoxidizing agent in an amount of 0.3% or more.
Further, since Mn has a large effect of improving the hardenability, it is possible to increase the uniformity in the cross section by increasing the Mn content ratio when the wire diameter is large, and the ductility of the steel wire after drawing is increased. It is effective for improvement. However, if it exceeds 1.0%, martensite is generated in the central segregated portion, and the wire drawability deteriorates, so the upper limit is 1.0%.
【００１２】Ｃrは、パーライトのラメラー間隔を低減
し、線材の強度と伸線加工性を向上させるため、必要に
応じて０.１％以上添加する。０.１％未満ではその効果
が十分でなく、一方、１.０％を超えると変態に要する
時間が長くなり、設備の大型化、あるいは、生産能率の
低下をきたすため、１.０％を上限とする。[0012] Cr is added in an amount of 0.1% or more, if necessary, in order to reduce the lamellar spacing of pearlite and improve the strength and wire drawing workability of the wire. If it is less than 0.1%, the effect is not sufficient. On the other hand, if it exceeds 1.0%, the time required for transformation becomes long, the equipment becomes large, or the production efficiency decreases, so 1.0% is required. The upper limit.
【００１３】Ｖは、Ｍnと同様、焼入れ性を向上させる
ため、線径が大きい場合の強化には効果的である。ま
た、炭窒化物を形成して析出硬化によりパーライトを強
化する。この目的のために必要に応じて０.０２％以上
添加する。しかし、Ｖ添加によりパーライト変態が遅延
し、マルテンサイトやベイナイトが生成しやすくなるた
め、また、Ｖ炭窒化物の析出硬化作用が飽和するため、
０.３％を上限とする。V, like Mn, improves the hardenability and is effective for strengthening when the wire diameter is large. It also forms carbonitrides and strengthens pearlite by precipitation hardening. For this purpose, 0.02% or more is added if necessary. However, the addition of V delays the pearlite transformation, facilitates the formation of martensite and bainite, and saturates the precipitation hardening action of V carbonitride.
The upper limit is 0.3%.
【００１４】オーステナイト域で高速かつ高減面率の線
材圧延した後、直ちに冷却する場合には、再加熱パテン
ティングの場合に比べて、オーステナイト結晶粒は細か
くなる傾向を有す。しかし、線材の絞り値や鋼線の延性
をより一層向上させたい場合には、Ａl、Ｔiの１種ない
し２種以上を０.１％以下添加する。これらの元素はい
ずれも炭化物や窒化物を生成しやすく、このため、オー
ステナイト粒を細粒化し、線材の延性を向上する効果が
強い。しかし、０.１％を超えて添加しても、その効果
は飽和するのみならず、非金属介在物が増加するため、
０.１％を上限とする。When the wire rod is rolled at a high speed and with a high area reduction rate in the austenite region and immediately cooled, the austenite crystal grains tend to be finer than in the case of reheating patenting. However, in order to further improve the drawing value of the wire and the ductility of the steel wire, one or more of Al and Ti are added in an amount of 0.1% or less. All of these elements easily generate carbides and nitrides, and therefore have the effect of making austenite grains finer and improving the ductility of the wire. However, even if added over 0.1%, the effect not only saturates, but also non-metallic inclusions increase,
The upper limit is 0.1%.
【００１５】次に、溶融Ｚnめっき浴組成の限定理由に
ついてのべる。Ｚn−Ａl合金の耐食性はＡl濃度に依存
し、Ａl濃度が高い方が良好な耐食性を示す。したがっ
て、十分な耐食性向上効果を得るためには２％以上含有
せしめる必要がある。一方、１２％を超えると添加効果
が飽和してくるうえ、融点上昇によりめっき温度が高く
なり、鋼線強度および捻回値の低下をまねく。これよ
り、Ｚn−Ａl合金のＡl濃度の下限を２％、上限を１２
％とする。なお、Ｚn−Ａl二元系合金以外にも、前記従
来技術に示したところの、Ｚn−Ａlをベースとする各種
合金を使用することも可能である。Next, the reasons for limiting the composition of the hot-dip Zn plating bath will be described. The corrosion resistance of the Zn-Al alloy depends on the Al concentration, and the higher the Al concentration, the better the corrosion resistance. Therefore, in order to obtain a sufficient effect of improving the corrosion resistance, it is necessary to contain 2% or more. On the other hand, if it exceeds 12%, the effect of addition is saturated, and the melting point rises, the plating temperature rises, and the steel wire strength and the twisting value decrease. From this, the lower limit of the Al concentration in the Zn-Al alloy is 2% and the upper limit is 12.
%. In addition to the Zn-Al binary alloy, it is possible to use various alloys based on Zn-Al as shown in the above-mentioned prior art.
【００１６】めっき後の鋼線には矯正加工を施す。矯正
の目的は、めっき鋼線の直線性を向上させること、およ
び、以下に述べるブルーイングとの複合効果によりＰＷ
Ｓ鋼線のクリープ値を低減させることである。矯正は、
通常のローラー型矯正機ないしは回転こま式矯正機を用
いて行う。Straightening is applied to the steel wire after plating. The purpose of straightening is to improve the linearity of the plated steel wire, and to combine PW with the brewing effect described below.
It is to reduce the creep value of S steel wire. Correction
It is carried out by using a normal roller type straightening machine or a rotary top type straightening machine.
【００１７】矯正後の鋼線にはブルーイングを施す。ブ
ルーイングの目的は、矯正により導入された転位を固定
してＰＷＳ鋼線の降伏強度を高めること、および、クリ
ープひずみを減らすことである。ブルーイング温度は、
２５０℃未満では転位の固定が不十分であり、３００〜
３５０℃が好ましい。一方、３７０℃を超えるとめっき
層が軟化し、３８２℃以上ではめっき層の一部が融解す
る。したがって、ブルーイング温度の下限は２５０℃、
上限は３７０℃とする。なお、本発明法のＡl濃度範囲
のＺn−Ａl合金を使用して溶融めっきを行った場合、通
常の溶融Ｚnめっきの場合とは異なり、Ｚn−Ｆe合金層
の発達はみられず、また、めっき表面光沢もほとんど変
化しない。本発明法により製造された鋼線が、溶融Ｚn
めっき鋼線に比べて良好な耐食性を示す理由は、耐食性
に優れためっき組成であることに加え、上述したよう
に、めっき層の熱的安定性が高いことによる。The steel wire after straightening is subjected to bluing. The purpose of bluing is to fix dislocations introduced by straightening to increase the yield strength of PWS steel wire and to reduce creep strain. The brewing temperature is
If the temperature is less than 250 ° C., the dislocation is insufficiently fixed,
350 ° C. is preferred. On the other hand, when the temperature exceeds 370 ° C, the plating layer softens, and when the temperature is 382 ° C or higher, part of the plating layer melts. Therefore, the lower limit of bluing temperature is 250 ° C,
The upper limit is 370 ° C. Incidentally, when hot dip plating is performed using a Zn-Al alloy in the Al concentration range of the method of the present invention, unlike the case of normal hot dip Zn plating, no Zn-Fe alloy layer development is observed, and Plating surface gloss is almost unchanged. The steel wire produced by the method of the present invention is
The reason why the plated steel wire has better corrosion resistance than the plated steel wire is that the plating composition has excellent corrosion resistance and, as described above, the thermal stability of the plated layer is high.
【００１８】[0018]
【実施例】以下に、実施例として、直径５ｍｍ、引張強
さ２００ｋｇｆ／ｍｍ2級および２２０ｋｇｆ／ｍｍ2級
の高張力ＰＷＳ鋼線の製造結果を示す。表１に示す化学
成分の鋼より製造された直径１３ｍｍの線材をパテンテ
ィング後伸線し直径４.９６ｍｍの鋼線とした。これを
酸洗、溶融Ｚnめっきしたのち矯正し、その後、流動層
炉を用いてブルーイングを行った。めっき付着量はいず
れも３００〜３２０ｇ／ｍ2である。EXAMPLES As examples, the production results of high-strength PWS steel wire having a diameter of 5 mm and a tensile strength of 200 kgf / mm 2 class and 220 kgf / mm 2 class are shown below. A wire rod having a diameter of 13 mm manufactured from the steel having the chemical composition shown in Table 1 was drawn after patenting to obtain a steel wire having a diameter of 4.96 mm. This was pickled, hot dip Zn plated, straightened, and then subjected to bluing using a fluidized bed furnace. The plating adhesion amount is 300 to 320 g / m 2 in all cases.
【００１９】ＰＷＳ鋼線の評価方法のうち、クリープひ
ずみの測定は次の条件で行った。 応力＝鋼線の実引張強さ×０.６０ 温度＝３５℃ 時間＝５００ｈ また、耐食性の評価は、ＪＩＳ Ｚ２３７１に規定され
た塩水噴霧試験により行い、赤錆発生時間を溶融Ｚnめ
っき鋼線と比較した。結果を下記の数１で定義する耐食
性倍率として定量化した。Among the evaluation methods for PWS steel wire, the creep strain was measured under the following conditions. Stress = Actual tensile strength of steel wire × 0.60 Temperature = 35 ° C. Time = 500 h In addition, corrosion resistance was evaluated by a salt spray test specified in JIS Z2371, and the red rust generation time was compared with that of hot-dip galvanized steel wire. did. The result was quantified as the corrosion resistance magnification defined by the following formula 1.
【００２０】[0020]
【数１】 [Equation 1]
【００２１】[0021]
【表１】 [Table 1]
【００２２】[0022]
【表１】続 [Table 1] Continuation
【００２３】目標とする強度レベルは、ＣrあるいはＶ
の添加されていないもの(Ａ，Ｂ，Ｆ群)は２００ｋｇｆ
／ｍｍ2級、添加されているもの(Ｃ，Ｄ，Ｅ，Ｇ群)は
２２０ｋｇｆ／ｍｍ2級である。目標とする延性は、捻
回値(１００ｄ)で２０回以上、また、耐食性は耐食性倍
率で３以上である。The target intensity level is Cr or V
200 kgf without addition of (A, B, F groups)
/ Mm 2 class, those added (C, D, E, G groups) are 220 kgf / mm 2 class. The target ductility is 20 times or more at the twist value (100d), and the corrosion resistance is 3 or more at the corrosion resistance magnification.
【００２４】表１で、Ａ群はＣ含有量、Ｂ群はＳi含有
量、Ｃ群はＣr含有量、Ｄ群はＶ含有量の影響を示した
ものである。Ｅ−１はＣrおよびＶの両元素が添加され
ている。Ａ−１はＣ量不足のため目標強度に到達してい
ない。一方、Ａ−６は初析セメンタイトが発生したた
め、鋼線の捻回値が大幅に低下した。同様に、Ｂ群で、
Ｓiを１.４３％含有するＢ−４は、鋼線の捻回値が低
い。Ｃr含有量が１％を超えるＣ−６は、パテンティン
グ材の中心偏析部に少量のマルテンサイトが生成したた
め、鋼線の捻回値が著しく劣化した。Ｄ群でＶを０.３
８％含有するＤ−４の捻回値が低いのも同様の理由によ
る。In Table 1, the effects of the C content in the A group, the Si content in the B group, the Cr content in the C group, and the V content in the D group are shown. Both elements Cr and V are added to E-1. A-1 does not reach the target strength because the amount of C is insufficient. On the other hand, in A-6, proeutectoid cementite was generated, so that the twist value of the steel wire was significantly reduced. Similarly, in group B,
B-4, which contains 1.43% Si, has a low twist value of the steel wire. With C-6 having a Cr content of more than 1%, a small amount of martensite was generated in the central segregation portion of the patenting material, so that the twist value of the steel wire was significantly deteriorated. V of 0.3 in group D
The reason why the twist value of D-4 containing 8% is low is also due to the same reason.
【００２５】Ｆ群はＺnめっき浴中のＡl濃度の影響を示
したものである。Ｆ−１は通常のＺnめっきである。Ｆ
−２は、Ａl濃度が２％未満であるため、耐食性倍率が
３に達していない。Ａl濃度の上昇により、はじめ耐食
性は向上するが、やがて飽和する傾向を示す。しかし、
Ｆ−５は、Ａl濃度が最も高く、めっき温度が５００℃
に達したため、鋼線強度が目標値以下となり、さらに捻
回特性も劣化した。Group F shows the influence of Al concentration in the Zn plating bath. F-1 is a normal Zn plating. F
In the case of -2, the Al concentration is less than 2%, so the corrosion resistance magnification does not reach 3. Corrosion resistance is initially improved by increasing Al concentration, but it tends to be saturated soon. But,
F-5 has the highest Al concentration and the plating temperature is 500 ° C.
As a result, the strength of the steel wire fell below the target value, and the twisting characteristics deteriorated.
【００２６】Ａ〜Ｇ群の各試料で、本発明法のＡl濃度
範囲でめっきされたものは、いずれも溶融Ｚnめっきの
３倍以上という優れた耐食性を示す。Each of the samples of groups A to G plated in the Al concentration range of the method of the present invention exhibits excellent corrosion resistance, which is 3 times or more that of hot-dip Zn plating.
【００２７】Ｇ群はブルーイング温度の影響を示したも
のである。ブルーイング温度が２５０℃未満のＧ−１は
捻回値が低く、かつ、クリープひずみも大きい。Group G shows the influence of the brewing temperature. G-1 having a bluing temperature of less than 250 ° C. has a low twist value and a large creep strain.
【００２８】矯正の効果は、ローラー型矯正機を使用し
た場合についてはＡ−２とＡ−３、Ａ−４とＡ−５に、
回転こま型矯正機を使用した場合についてはＣ−２とＣ
−３、Ｃ−４とＣ−５に比較して示した。いずれの矯正
機を使用しても、本発明法である矯正後ブルーイングを
付加する方法によれば、ＰＷＳ鋼線のクリープひずみは
顕著に低下するのみならず、直線性も大幅に改善され
る。The effect of straightening is as follows: A-2 and A-3, A-4 and A-5 when using a roller type straightening machine.
C-2 and C when using a rotary top straightener
-3, C-4 and C-5. Whichever straightening machine is used, the method of adding bluing after straightening, which is the method of the present invention, not only significantly reduces the creep strain of the PWS steel wire, but also significantly improves the linearity. .
【００２９】[0029]
【発明の効果】以上の説明から明らかなように、本発明
によれば、耐食性、直線性、ならびに耐クリープ性に優
れた、引張強さ２００ｋｇｆ／ｍｍ2級および２２０ｋ
ｇｆ／ｍｍ2級の吊構造用高強度鋼線（ＰＷＳ）の製造
が可能である。As is apparent from the above description, according to the present invention, the tensile strength is 200 kgf / mm 2 grade and 220 k, which is excellent in corrosion resistance, linearity and creep resistance.
It is possible to manufacture gf / mm 2 class high strength steel wire (PWS) for suspension structures.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ２３Ｃ 2/28 Ｃ２３Ｃ 2/28 // Ｃ２２Ｃ 18/04 Ｃ２２Ｃ 18/04 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI Technical indication C23C 2/28 C23C 2/28 // C22C 18/04 C22C 18/04
Claims (4)
〜１.３％，Ｍn：０.３〜１.０％，残余Ｆe及びび不可
避的不純物からなる鋼線を、重量比でＡlを２〜１２％
含有するＺn浴を用いて溶融めっきした後、矯正し、２
５０〜３７０℃でブルーイングすることを特徴とする吊
構造用高強度鋼線の製造方法。1. C: 0.75 to 1.0%, Si: 0.15
~ 1.3%, Mn: 0.3-1.0%, steel wire consisting of residual Fe and inevitable impurities, Al in the weight ratio of 2-12%
After hot-dip galvanizing using the contained Zn bath, straightening, 2
A method for producing a high-strength steel wire for a hanging structure, which comprises bluing at 50 to 370 ° C.
〜１.３％，Ｍn： ０.３〜１.０％，にＣr：０.１〜
１.０％， Ｖ：０.０２〜０.３０％の１種又は２種を
含有し残部Ｆe及び不可避的不純物からなる鋼線を、重
量比でＡlを２〜１２％含有するＺn浴を用いて溶融めっ
きした後、矯正し、２５０〜３７０℃でブルーイングす
ることを特徴とする吊構造用高強度鋼線の製造方法。2. C: 0.75-1.0%, Si: 0.15
To 1.3%, Mn: 0.3 to 1.0%, Cr: 0.1 to
A steel wire containing 1.0%, V: 0.02 to 0.30% of 1 type or 2 types and the balance Fe and unavoidable impurities, and a Zn bath containing 2 to 12% of Al by weight ratio. A method for producing a high-strength steel wire for a suspended structure, comprising hot-dip-plating, straightening, and bluing at 250 to 370 ° C.
〜１.３％，Ｍn：０.３〜１.０％にＡl、Ｔiの１種又は
２種を０.１％以下含有し残部Ｆe及び不可避的不純物か
らなる鋼線を、重量比でＡlを２〜１２％含有するＺn浴
を用いて溶融めっきした後、矯正し、２５０〜３７０℃
でブルーイングすることを特徴とする吊構造用高強度鋼
線の製造方法。3. C: 0.75 to 1.0%, Si: 0.15
Steel wire containing Al and Ti of 0.1 or less in an amount of up to 1.3% and Mn of 0.3 to 1.0% and the balance Fe and inevitable impurities is Al in a weight ratio. Hot-dip galvanizing using a Zn bath containing 2 to 12%
A method for manufacturing a high-strength steel wire for a suspended structure, which is characterized by blueing.
〜１.３％，Ｍn：０.３〜１.０％にＣr：０.１〜１.０
％， Ｖ：０.０２〜０.３０％の１種又は２種、及びＡ
l、Ｔiの１種又は２種を０.１％以下含有し残部Ｆe及び
不可避的不純物からなる鋼線を、重量比でＡlを２〜１
２％含有するＺn浴を用いて溶融めっきした後、矯正
し、２５０〜３７０℃でブルーイングすることを特徴と
する吊構造用高強度鋼線の製造方法。4. C: 0.75 to 1.0%, Si: 0.15
To 1.3%, Mn: 0.3 to 1.0%, Cr: 0.1 to 1.0
%, V: 0.02 to 0.30% of one or two kinds, and A
a steel wire containing 0.1% or less of 1 or 2 of Ti and Ti and the balance Fe and unavoidable impurities, and Al in a weight ratio of 2 to 1
A method for producing a high-strength steel wire for a suspended structure, comprising hot-dip-plating using a Zn bath containing 2%, straightening, and bluing at 250 to 370 ° C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP852491A JP2500947B2 (en) | 1991-01-28 | 1991-01-28 | Manufacturing method of high strength steel wire for suspension structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP852491A JP2500947B2 (en) | 1991-01-28 | 1991-01-28 | Manufacturing method of high strength steel wire for suspension structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04246125A JPH04246125A (en) | 1992-09-02 |
| JP2500947B2 true JP2500947B2 (en) | 1996-05-29 |
Family
ID=11695534
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP852491A Expired - Lifetime JP2500947B2 (en) | 1991-01-28 | 1991-01-28 | Manufacturing method of high strength steel wire for suspension structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2500947B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2447389A4 (en) * | 2009-06-25 | 2016-08-17 | Nippon Steel & Sumitomo Metal Corp | High-strength zn-al-plated steel wire for bridges which has excellent corrosion resistance and fatigue properties, and process for production thereof |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4185997B2 (en) * | 1999-10-21 | 2008-11-26 | 株式会社ジェイテクト | Manufacturing method of bearing parts |
| KR101420281B1 (en) * | 2012-10-09 | 2014-08-14 | 고려제강 주식회사 | Wirerope and manufacturing method thereof |
| CN112458356B (en) * | 2020-10-15 | 2022-02-01 | 中天钢铁集团有限公司 | Phi 14mm wire rod for 1860MPa bridge cable galvanized steel wire and preparation method |
-
1991
- 1991-01-28 JP JP852491A patent/JP2500947B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2447389A4 (en) * | 2009-06-25 | 2016-08-17 | Nippon Steel & Sumitomo Metal Corp | High-strength zn-al-plated steel wire for bridges which has excellent corrosion resistance and fatigue properties, and process for production thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04246125A (en) | 1992-09-02 |
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