KR101987656B1 - High strength steel wire and the method for manufacturing the same - Google Patents

High strength steel wire and the method for manufacturing the same Download PDF

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KR101987656B1
KR101987656B1 KR1020170175389A KR20170175389A KR101987656B1 KR 101987656 B1 KR101987656 B1 KR 101987656B1 KR 1020170175389 A KR1020170175389 A KR 1020170175389A KR 20170175389 A KR20170175389 A KR 20170175389A KR 101987656 B1 KR101987656 B1 KR 101987656B1
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steel wire
high strength
strength
wire
strength steel
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KR1020170175389A
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Korean (ko)
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이충열
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주식회사 포스코
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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/06Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C1/00Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D9/00Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/525Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Abstract

According to the present invention, provided are a high strength steel wire and a manufacturing method thereof. A strength of the high strength steel wire is increased in consideration of various factors affecting the strength of the steel wire, and at the same time, the steel wire has excellent fresh processability which suppresses a generation of delamination by optimizing a first fresh processing amount, a heat processing temperature, and a second fresh processing amount. The high strength steel wire according to one embodiment of the present invention comprises: the steel wire including 0.90-0.98 wt% of C, 0.3-0.8 wt% of Mn, 1.0-1.6 wt% of Si, 0.2-0.6 wt% of Cr, and the remaining balance of Fe and other unavoidable impurities; and an aluminum cladding layer provided on a surface of the steel wire. Here, the high strength steel wire has a twist count of more than 30.

Description

고강도 강선 및 그 제조방법{HIGH STRENGTH STEEL WIRE AND THE METHOD FOR MANUFACTURING THE SAME}High strength steel wire and manufacturing method thereof {HIGH STRENGTH STEEL WIRE AND THE METHOD FOR MANUFACTURING THE SAME}

본 발명은 우수한 신선가공성을 갖는 고강도 강선 및 그 제조방법에 관한 것이다.The present invention relates to a high-strength steel wire having excellent drawability and a manufacturing method thereof.

일반적으로, 고강도 강선을 얻기 위해 여러 가지 방법이 사용될 수 있다.In general, several methods can be used to obtain high strength steel wire.

우선 소재 자체의 강도를 증가시키는 방법이 사용될 수 있다. 즉 고강도 강선을 얻기 위한 방법의 하나로서, 강의 강도를 높이는 강화원소를 다량 첨가하여 소재 자체의 강도를 증가시키는 방법이 사용될 수 있다. 이러한 강화 원소의 대표적인 예로는 탄소를 들 수 있다. 탄소 함량이 증가할 경우 선재 내부에는 경질상인 시멘타이트의 분율이 증가하고 펄라이트 조직의 라멜라 간격이 조밀해져 소재의 강도가 향상되게 된다. 탄소 이외에도 다양한 합금원소를 첨가하는 기술이 제안되어 왔다.First, a method of increasing the strength of the material itself may be used. That is, as one of the methods for obtaining a high strength steel wire, a method of increasing the strength of the material itself by adding a large amount of reinforcing elements to increase the strength of the steel. Representative examples of such reinforcing elements include carbon. As the carbon content increases, the fraction of hard cementite increases in the wire rod and the lamellar spacing of the pearlite structure is densified, thereby improving the strength of the material. In addition to carbon, a technique of adding various alloying elements has been proposed.

다른 방법으로 가공경화율을 증가시키는 방법이 사용될 수 있다. 강선 등은 압연된 선재를 신선 및 열처리하여 제조한다. 상기 선재의 신선가공시 가공경화율을 증가시킴으로써 강도가 대폭 향상될 수 있다. 즉, 신선가공시 가공경화율을 증가시키면 라멜라 간격이 미세화되고 가공경화계수가 증가하며, 전위의 집적도가 증가하게 되어 강선의 강도는 증가하게 된다.Alternatively, a method of increasing the work hardening rate may be used. Steel wire is manufactured by drawing and heat-treating the rolled wire. The strength can be greatly improved by increasing the work hardening rate during the wire drawing of the wire rod. That is, when the work hardening rate is increased during lamination, the lamellar spacing becomes finer, the work hardening coefficient increases, and the degree of integration of dislocations increases, thereby increasing the strength of the steel wire.

또 다른 방법으로 강선의 신선변형율을 증가시킴으로써 강도가 향상될 수 있다. 이 때, 소재의 신선변형율은 소재의 연성에 밀접한 관계가 있는 것으로서 소재 자체가 신선가공시 단선이 일어나지 않고 용이하게 가공될수록 강도향상에 유리하다.Alternatively, strength can be improved by increasing the strain rate of the steel wire. At this time, the fresh strain of the material is closely related to the ductility of the material, and the material itself is advantageous in improving strength as it is easily processed without breaking wires during fresh processing.

전술한 방법들은 모두 독립적으로 작용하는 것이 아니라 상호 연관되어 강선의 강도를 변화시키는 것이므로, 이들을 독립적으로 제어하여 강선의 강도를 향상시키는 것은 한계가 있다. Since the above-described methods do not all act independently, but are related to each other to change the strength of the steel wire, there is a limit to improving the strength of the steel wire by controlling them independently.

본 발명은 강선의 강도에 미치는 여러 인자들을 종합적으로 고려하여 강도를 상승시키고, 이와 동시에 1차 신선가공량, 열처리 온도, 2차 신선가공량을 최적화하여 디라미네이션의 발생을 억제시킨 우수한 신선가공성을 갖는 고강도 강선 및 그 제조방법을 제공하고자 한다.The present invention improves the strength in consideration of various factors affecting the strength of the steel wire comprehensively, and at the same time excellent wire workability that suppresses the occurrence of delamination by optimizing the primary drawing amount, heat treatment temperature, secondary drawing amount It is intended to provide a high strength steel wire having and a method of manufacturing the same.

본 발명의 일 실시예에 따른 고강도 강선은 중량%로, C: 0.90~0.98%, Mn: 0.3~0.8%, Si: 1.0~1.6%, Cr: 0.2~0.6%, 잔부 Fe 및 기타 불가피한 불순물을 포함하는 강선; 및 상기 강선 표면에 마련된 알루미늄 클래딩 층;을 포함하고, 30회 이상의 비틀림 횟수를 갖는다.High-strength steel wire according to an embodiment of the present invention by weight, C: 0.90-0.98%, Mn: 0.3-0.8%, Si: 1.0-1.6%, Cr: 0.2-0.6%, balance Fe and other unavoidable impurities Liner containing; And an aluminum cladding layer provided on the surface of the steel wire and having a twist number of 30 or more times.

또한, 상기 고강도 강선은 1800Mpa 이상의 인장강도를 가질 수 있다.In addition, the high strength steel wire may have a tensile strength of 1800 Mpa or more.

본 발명의 일 실시예에 따른 고강도 강선의 제조방법은 중량%로, C: 0.90~0.98%, Mn: 0.3~0.8%, Si: 1.0~1.6%, Cr: 0.2~0.6%, 잔부 Fe 및 기타 불가피한 불순물을 포함하는 선재를 변형율 1.4~1.65의 범위로 1차 신선 가공하여 강선을 얻는 단계; 상기 강선을 300~400℃에서 열처리하는 단계; 및 0.3~0.7의 범위로 2차 신선 가공하는 단계;를 포함한다.Method for producing a high strength steel wire according to an embodiment of the present invention in weight%, C: 0.90-0.98%, Mn: 0.3-0.8%, Si: 1.0-1.6%, Cr: 0.2-0.6%, balance Fe and other Obtaining a steel wire by first drawing the wire including an unavoidable impurity in a strain of 1.4 to 1.65; Heat-treating the steel wire at 300 to 400 ° C; It includes; and the secondary fresh processing in the range of 0.3 ~ 0.7.

또한, 상기 열처리가 수행된 강선의 표면에 알루미늄 클래딩 층을 형성하는 단계;를 더 포함할 수 있다.The method may further include forming an aluminum cladding layer on a surface of the steel wire on which the heat treatment is performed.

본 발명에 따르면, 고강도화의 걸림돌로 작용하고 있는 디라미네이션 발생을 억제시키고 비틀림특성 또한 우수할 뿐만 아니라, 신선한계를 증대시킬 수 있어 궁극적으로 고강도를 갖는 강선을 제공할 수 있다.According to the present invention, it is possible not only to suppress the generation of delamination acting as a stumbling block for high strength and to improve the torsional characteristics, but also to increase the fresh system, thereby providing a steel wire having ultimately high strength.

이하에서는 본 발명의 실시예를 상세히 설명한다. 이하의 실시예는 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자에게 본 발명의 사상을 충분히 전달하기 위해 제시하는 것이다. 본 발명은 여기서 제시한 실시예만으로 한정되지 않고 다른 형태로 구체화될 수도 있다. 또한 어떤 부분이 어떤 구성요소를 "포함"한다고 할 때, 이는 특별히 반대되는 기재가 없는 한 다른 구성요소를 제외하는 것이 아니라 다른 구성요소를 더 포함할 수 있는 것을 의미한다. 단수의 표현은 문맥상 명백하게 예외가 있지 않는 한, 복수의 표현을 포함한다.Hereinafter, embodiments of the present invention will be described in detail. The following examples are presented to fully convey the spirit of the present invention to those skilled in the art. The invention is not limited to the examples presented herein but may be embodied in other forms. In addition, when a part is said to "include" a certain component, which means that it may further include other components, except to exclude other components unless otherwise stated. Singular expressions include plural expressions unless the context clearly indicates an exception.

본 발명의 일 실시예는 중량%로, C 중량%로, C: 0.90~0.98%, Mn: 0.3~0.8%, Si: 1.0~1.6%, Cr: 0.2~0.6%, 잔부 Fe 및 기타 불가피한 불순물을 포함하는 선재; 및 선재 표면에 마련된 알루미늄 클래딩 층;을 포하하고, 30회 이상의 비틀림 횟수를 갖는 고강도 강선을 제공한다.One embodiment of the present invention in weight percent, C weight percent, C: 0.90-0.98%, Mn: 0.3-0.8%, Si: 1.0-1.6%, Cr: 0.2-0.6%, balance Fe and other unavoidable impurities Wire rod comprising a; And an aluminum cladding layer provided on the wire surface, and provides a high strength steel wire having a twist count of 30 or more times.

본 발명의 일 실시예는 상기 합금 조성의 선재를 이용하여, 하기의 제조방법에 따라 고강도 강선을 제공한다.One embodiment of the present invention by using the wire of the alloy composition, to provide a high strength steel wire according to the following manufacturing method.

본 발명의 일 실시예에 따른 고강도 강선의 제조방법은 중량%로, C: 0.90~0.98%, Mn: 0.3~0.8%, Si: 1.0~1.6%, Cr: 0.2~0.6%, 잔부 Fe 및 기타 불가피한 불순물을 포함하는 선재를 변형율 1.4~1.65의 범위로 1차 신선 가공하여 강선을 얻는 단계; 상기 강선을 300~400℃에서 열처리하는 단계; 및 0.3~0.7의 범위로 2차 신선 가공하는 단계;를 포함한다.Method for producing a high strength steel wire according to an embodiment of the present invention in weight%, C: 0.90-0.98%, Mn: 0.3-0.8%, Si: 1.0-1.6%, Cr: 0.2-0.6%, balance Fe and other Obtaining a steel wire by first drawing the wire including an unavoidable impurity in a strain of 1.4 to 1.65; Heat-treating the steel wire at 300 to 400 ° C; It includes; and the secondary fresh processing in the range of 0.3 ~ 0.7.

이하, 본 발명의 실시예에 따른 합금성분 원소 함량의 수치한정 이유에 대하여 설명한다. 이하에서는 특별한 언급이 없는 한 단위는 중량%이다.Hereinafter, the reason for numerical limitation of the alloying element content according to the embodiment of the present invention will be described. In the following, the unit is% by weight unless otherwise specified.

C의 함량은 0.9 내지 0.98%이다.The content of C is 0.9 to 0.98%.

C는 강선의 강도를 향상시키기 위해 첨가되는 원소이다. C의 함량이 0.90%미만인 경우에는 강도의 향상 효과가 불충분하고, 0.98%를 초과하는 경우에는 강도 향상은 얻어지지만 연성이 감소하므로 C의 함량은 0.90~0.98%의 범위를 갖는 것이 바람직하다.C is an element added to improve the strength of the steel wire. If the content of C is less than 0.90%, the effect of improving strength is insufficient. If the content of C is more than 0.98%, the strength is obtained, but the ductility decreases. Therefore, the content of C is preferably in the range of 0.90 to 0.98%.

Mn의 함량은 0.3 내지 0.8%이다.The content of Mn is 0.3 to 0.8%.

Mn은 소입성을 증가시키는데 효과적인 원소이나 중심편석이 심한 원소로서 0.8%를 초과할 경우 저온조직을 유발할 가능성이 매우 크며, 0.3%미만으로 첨가되는 경우 첨가의 효과가 충분히 달성될 수 없다. 따라서, 상기 Mn의 함량은 0.3~0.8%의 범위를 갖는 것이 바람직하다.Mn is an element effective for increasing the hardenability or a severe elemental segregation, which is very likely to cause low-temperature tissues when exceeding 0.8%, and when added below 0.3%, the effect of addition cannot be sufficiently achieved. Therefore, the content of Mn is preferably in the range of 0.3 ~ 0.8%.

Si의 함량은 1.0 내지 1.6%이다.The content of Si is 1.0 to 1.6%.

Si는 고용강화 효과와 함께 펄라이트 층상을 안정화시켜 강도 및 연성을 증가시키는 성분이다. 전술한 효과를 얻기 위해, Si의 함량은 1.0%초과의 범위를 갖는 것이 바람직하다. 다만, Si의 함량이 1.6%를 초과하는 경우에는 연성을 급격히 감소시켜 신선가공성을 악화시킨다. 따라서, 상기 Si의 함량은 1.0~1.6%의 범위를 갖는 것이 바람직하다.Si is a component that increases the strength and ductility by stabilizing the pearlite layer with a solid solution strengthening effect. In order to obtain the above-mentioned effect, the content of Si preferably has a range of more than 1.0%. However, when the content of Si exceeds 1.6%, the ductility is rapidly reduced to deteriorate the fresh workability. Therefore, the content of Si preferably has a range of 1.0 to 1.6%.

Cr의 함량은 0.2 내지 0.7%이다.The content of Cr is 0.2 to 0.7%.

Cr은 펄라이트의 층상 조직을 미세화함으로써 강도와 연성을 향상시키는 성분으로서, 0.2%미만으로 첨가되는 경우 충분한 층상조직의 미세화 효과가 없어 강도 및 연성 향상 효과가 미흡하다. Cr의 함량이 0.7%를 초과하는 경우에는 항온변태속도를 느리게 하여 생산성을 악화시킨다. 따라서, 상기 Cr의 함량은 0.2~0.7%의 범위를 갖는 것이 바람직하다.Cr is a component that improves strength and ductility by miniaturizing the layered structure of pearlite. When it is added at less than 0.2%, Cr does not have sufficient effect of miniaturization of the layered structure and thus insufficient strength and ductility improvement effect. When the content of Cr exceeds 0.7%, the constant temperature transformation rate is slowed down and the productivity is deteriorated. Therefore, the content of Cr is preferably in the range of 0.2 ~ 0.7%.

이하, 본 발명의 제조방법에 대하여 상세히 설명한다.Hereinafter, the manufacturing method of the present invention will be described in detail.

우선, 상기와 같은 조성을 갖는 선재를 신선가공에 적합하도록 하기 위하여, 상기 신선가공 전에 상기 선재를 LP(Lead Partenting)열처리하는 것이 바람직하다. 상기 LP열처리는 고온으로 열처리된 선재를 납욕에 담금질함으로써 신선가공에 적합한 조직으로 변태시키는 공정을 의미한다.First, in order to make the wire rod having the composition described above suitable for drawing, it is preferable to heat-treat the wire rod (LP) before the drawing. The LP heat treatment refers to a process of transforming the wire heat-treated at high temperature into a structure suitable for fresh processing by quenching in a lead bath.

LP열처리를 거친 선재의 강도를 증가시키기 위해 1차신선가공하여 강선을 얻는다. 선재의 신선가공 시, 선재의 변형율이 1.4~1.65%의 범위를 만족하도록 신선가공을 제어할 수 있다. 선재의 변형율이 1.4% 미만인 경우 본 발명이 달성하고자 하는 강도를 얻을 수 없으며, 1.65%를 초과하는 경우에는 지나친 가공경화로 인하여 강선의 단선이 잘 일어나게 되는 단점이 있다.Steel wire is obtained by primary drawing to increase the strength of LP heat treated wire rod. When drawing wire, drawing can be controlled so that the strain rate of wire is within 1.4 ~ 1.65%. When the strain of the wire is less than 1.4%, the present invention cannot obtain the strength to be achieved, and when it exceeds 1.65%, there is a disadvantage in that wire breakage occurs well due to excessive work hardening.

전술한 1차 신선가공 후에는 300~400℃의 온도 범위에서 강선에 대한 열처리를 수행한다. 열처리 온도가 300℃ 미만일 경우, 강선에 에이징(aging)이 발생하여 전위의 이동이 어려워짐으로써 신선가공성이 저하되는 단점이 있다. 열처리 온도가 400℃를 초과할 경우, 강선의 펄라이트 조직내에 포함된 판상의 시멘타이트가 구상으로 변화되어 인장강도가 떨어진다. 따라서, 상기 열처리 온도는 300~400℃의 범위를 갖는 것이 바람직하다.After the primary drawing, the heat treatment is performed on the steel wire in the temperature range of 300 ~ 400 ℃. If the heat treatment temperature is less than 300 ° C, aging occurs in the steel wire, which makes it difficult to transfer dislocations, thereby degrading the drawability. When the heat treatment temperature exceeds 400 ° C., the plate-like cementite contained in the pearlite structure of the steel wire is changed into a spherical shape and the tensile strength drops. Therefore, it is preferable that the said heat processing temperature has a range of 300-400 degreeC.

열처리 이후, 강선의 고강도화를 위해 2차 신선가공이 수행된다. 상기 신선가공 시 강선의 변형율이 0.3~0.7%의 범위를 만족하도록 신선가공이 제어될 수 있다. 변형율이 0.3% 미만인 경우 본 발명이 달성하고자 하는 강도를 얻을 수 없으며, 0.7%를 초과하는 경우에는 변형 시 크랙이 발생하여 디라미네이션이 발생한다.After the heat treatment, secondary drawing is performed to increase the strength of the steel wire. During the drawing process, the drawing process can be controlled so that the strain of the steel wire satisfies the range of 0.3 ~ 0.7%. If the strain rate is less than 0.3%, the strength to be achieved by the present invention cannot be obtained. If the strain rate is greater than 0.7%, cracking occurs when the strain occurs, thereby causing delamination.

개시된 실시예는 전술한 열처리를 거친 강선의 표면에 알루미늄 클래딩(cladding) 층을 형성하기 위한 알루미늄 클래딩 공정을 수행할 수 있다. 개시된 실시예에 따른 강선은 ACSR(Aluminum Conductors Steel Reinforced)과 같은 가공송전선의 중심 강선으로 사용될 수 있다. 일반적인 ACSR의 경우, 중심 강선을 송전 기능을 수행하는 알루미늄 도선이 감싸는 구조를 갖는데, 일반적으로 중심 강선은 그 표면에 아연 도금층을 포함한다. 이러한 일반적인 ACSR의 경우, 중심 강선의 아연 도금층과 알루미늄 도선 사이에 부식이 발생하는 문제점이 있다. 개시된 실시예에 따른 고강도 강선은 열처리를 거친 후 그 표면에 알루미늄 클래딩 층이 형성됨으로써, ACSR 중심 강선으로 사용될 경우, 알루미늄 도선과의 사이에서 발생하는 부식을 방지할 수 있다.The disclosed embodiment may perform an aluminum cladding process for forming an aluminum cladding layer on the surface of the steel wire subjected to the aforementioned heat treatment. The steel wire according to the disclosed embodiment may be used as a center steel wire of overhead transmission lines such as aluminum conductors steel reinforced (ACSR). In the case of a typical ACSR, the center wire has a structure surrounded by an aluminum conductor that performs a power transmission function. In general, the center wire includes a zinc plated layer on its surface. In the case of such a general ACSR, there is a problem that corrosion occurs between the galvanized layer of the center steel wire and the aluminum conductor. The high-strength steel wire according to the disclosed embodiment is formed after the heat treatment, the aluminum cladding layer is formed on the surface of the high-strength steel wire, when used as an ACSR center steel wire, it is possible to prevent the corrosion between the aluminum wire.

열처리 후 강선의 표면에 알루미늄 클래딩 층이 형성되면, 2차 신선가공은 알루미늄 클래딩 층이 형성된 강선에 대해 수행될 수 있다.After the heat treatment, if the aluminum cladding layer is formed on the surface of the steel wire, secondary drawing may be performed on the steel wire on which the aluminum cladding layer is formed.

전술한 바와 같이, 개시된 실시예는 상기 1차 신선가공 후에 열처리를 행하여, 디라미네이션 발생을 억제하고, 비틀림특성을 향상시킬 수 있다. 보다 상세하게, 개시된 실시예는 상기 1차 신선가공 후에 열처리를 행함으로써, 강선의 비틀림 횟수를 30회이상으로 증가시킬 수 있고, 연선 가공시 강선의 디라미네이션의 발생을 방지할 수 있으며, 강선의 인장강도 또한 1800MPa 이상으로 확보할 수 있으므로, 개시된 실시예에 따른 강선은 상기 특성들이 요구되는 강선에 매우 바람직하게 적용될 수 있다.As described above, in the disclosed embodiment, heat treatment may be performed after the primary drawing, thereby suppressing delamination and improving torsion characteristics. In more detail, the disclosed embodiment can increase the number of times the twisting of the steel wire to more than 30 times by performing the heat treatment after the primary wire drawing, it is possible to prevent the occurrence of delamination of the steel wire in the twisted wire processing, the tension of the steel wire Since the strength can also be secured to 1800 MPa or more, the steel wire according to the disclosed embodiment can be very preferably applied to the steel wire in which the above characteristics are required.

이하, 실시예를 통해 본 발명을 보다 상세히 설명한다. 다만, 하기 실시예는 본 발명을 상세히 설명하기 위한 예시일 뿐, 본 발명의 권리범위를 한정하지 않는다.Hereinafter, the present invention will be described in more detail with reference to Examples. However, the following examples are merely examples for describing the present invention in detail, and do not limit the scope of the present invention.

<실시예><Example>

하기 표 1의 성분범위를 가진 잉고트를 1000℃에서 열간압연하여 선재를 제조한 뒤, 하기 표 2의 조건으로 신선가공 및 열처리하여 강선을 제조하였다. 상기와 같이 제조된 발명재 1 내지 5와 비교재 1 및 2의 기계적 특성을 측정하고, 그 결과를 하기 표 2에 나타내었다.The ingot having a component range of the following Table 1 was hot-rolled at 1000 ° C to manufacture a wire, and then drawn and heat-treated under the conditions of Table 2 to produce a steel wire. Mechanical properties of Inventive Materials 1 to 5 and Comparative Materials 1 and 2 prepared as described above were measured, and the results are shown in Table 2 below.

구분division 성분(중량%)Ingredient (% by weight) CC SiSi MnMn CrCr 선재Wire rod 0.920.92 1.31.3 0.50.5 0.30.3

Figure 112017126675290-pat00001
Figure 112017126675290-pat00001

상기 표 2에 나타난 바와 같이, 본 발명에 부합되는 성분범위와 제조조건으로 제조된 발명재 1 내지 5는 1800Mpa 이상의 고강도를 가질 뿐만 아니라, 동시에 비틀림 특성 또한 우수하고, 특히 디라미네이션이 발생하지 않았음을 알 수 있다. 개시된 실시예에 따른 고강도 강선의 제조방법의 경우, 기존 제조방법보다 1차 신선가공량을 증가시킨 반면, 2차 신선 가공량을 감소시킴으로써 전술한 특징들을 획득할 수 있었다. 이는, 열처리 시 시효현상이 발생하면 전위의 이동이 힘들어지는데 상대적으로 열처리후의 2차 신선 가공량을 감소시킴으로써 시효현상을 억제할 수 있기 때문이다. 또한, 발명예 3의 경우 비교예 2에 비해 열처리 온도를 증가시켜 시효현상을 억제시킴으로써 디라미네이션 발생을 억제시킬수 있었다.As shown in Table 2, Inventions 1 to 5 prepared in the component range and manufacturing conditions according to the present invention not only has a high strength of 1800Mpa or more, but also has excellent torsional properties, and in particular, no lamination occurs. It can be seen. In the case of the method of manufacturing a high strength steel wire according to the disclosed embodiment, the above-described characteristics can be obtained by increasing the primary drawing amount compared to the existing manufacturing method, while reducing the secondary drawing amount. This is because, when the aging phenomenon occurs during heat treatment, dislocation shifting becomes difficult, because the aging phenomenon can be suppressed by relatively reducing the amount of secondary wire processing after the heat treatment. In addition, in the case of Inventive Example 3, it was possible to suppress the delamination by increasing the heat treatment temperature compared to Comparative Example 2 to suppress the aging phenomenon.

상술한 바에 있어서, 본 발명의 예시적인 실시예들을 설명하였지만, 본 발명은 이에 한정되지 않으며 해당 기술 분야에서 통상의 지식을 가진 자라면 다음에 기재하는 특허청구범위의 개념과 범위를 벗어나지 않는 범위 내에서 다양한 변경 및 변형이 가능함을 이해할 수 있을 것이다.As described above, the exemplary embodiments of the present invention have been described, but the present invention is not limited thereto, and a person skilled in the art does not depart from the spirit and scope of the following claims. It will be understood that various changes and modifications are possible in the following.

Claims (4)

중량%로, C: 0.90~0.98%, Mn: 0.3~0.8%, Si: 1.0~1.6%, Cr: 0.2~0.6%, 잔부 Fe 및 기타 불가피한 불순물을 포함하는 강선; 및
상기 강선 표면에 마련된 알루미늄 클래딩 층;을 포함하고,
30회 이상의 비틀림 횟수를 갖는 고강도 강선.
By weight, steel wire comprising C: 0.90-0.98%, Mn: 0.3-0.8%, Si: 1.0-1.6%, Cr: 0.2-0.6%, balance Fe and other unavoidable impurities; And
And an aluminum cladding layer provided on the steel wire surface.
High strength steel wire with 30 or more twist times.
제1항에 있어서
1800Mpa 이상의 인장강도를 갖는 것을 특징으로 하는 고강도 강선.
The method of claim 1
High strength steel wire, characterized in that it has a tensile strength of 1800Mpa or more.
중량%로, C: 0.90~0.98%, Mn: 0.3~0.8%, Si: 1.0~1.6%, Cr: 0.2~0.6%, 잔부 Fe 및 기타 불가피한 불순물을 포함하는 선재를 변형율 1.4~1.65%의 범위로 1차 신선 가공하여 강선을 얻는 단계;
상기 강선을 300~400℃에서 열처리하는 단계; 및
변형율 0.3~0.7%의 범위로 2차 신선 가공하는 단계;를 포함하는 고강도 강선의 제조방법.
By weight, wires containing C: 0.90-0.98%, Mn: 0.3-0.8%, Si: 1.0-1.6%, Cr: 0.2-0.6%, balance Fe and other unavoidable impurities range from 1.4-1.65% Primary drawing to obtain a steel wire;
Heat-treating the steel wire at 300 to 400 ° C; And
Method of producing a high strength steel wire comprising the; step of secondary drawing in the range of 0.3 ~ 0.7% strain.
제3항에 있어서,
상기 열처리가 수행된 강선의 표면에 알루미늄 클래딩 층을 형성하는 단계;를 더 포함하는 고강도 강선의 제조방법
The method of claim 3,
Forming an aluminum cladding layer on the surface of the steel wire subjected to the heat treatment; manufacturing method of high strength steel wire further comprising
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CN112427483A (en) * 2020-09-29 2021-03-02 天津市新天钢中兴盛达有限公司 14AC-1825 MPa-grade high-strength aluminum-clad steel wire and manufacturing method thereof
KR20230024117A (en) 2021-08-11 2023-02-20 주식회사 포스코 Excellent strenght steel wire and the method for manufacturing the same

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KR20080051671A (en) * 2006-12-06 2008-06-11 주식회사 포스코 Manufacturing method of the high strength wire for bridge cable having excellent torsional property
JP2012190615A (en) * 2011-03-09 2012-10-04 Nisshin Steel Co Ltd Aluminum coated thin steel wire for heat-resistant electric wire
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KR20080051671A (en) * 2006-12-06 2008-06-11 주식회사 포스코 Manufacturing method of the high strength wire for bridge cable having excellent torsional property
JP2012190615A (en) * 2011-03-09 2012-10-04 Nisshin Steel Co Ltd Aluminum coated thin steel wire for heat-resistant electric wire
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112427483A (en) * 2020-09-29 2021-03-02 天津市新天钢中兴盛达有限公司 14AC-1825 MPa-grade high-strength aluminum-clad steel wire and manufacturing method thereof
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