KR100471807B1 - Method of heat treatment of steel wire for car wire clamp - Google Patents

Method of heat treatment of steel wire for car wire clamp Download PDF

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KR100471807B1
KR100471807B1 KR10-2001-0070868A KR20010070868A KR100471807B1 KR 100471807 B1 KR100471807 B1 KR 100471807B1 KR 20010070868 A KR20010070868 A KR 20010070868A KR 100471807 B1 KR100471807 B1 KR 100471807B1
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steel wire
heat treatment
treatment
bluing
wire
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KR10-2001-0070868A
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KR20030039807A (en
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하성용
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현대자동차주식회사
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    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/525—Heat 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Coating With Molten Metal (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Abstract

본 발명은 자동차 와이어 클램프용 강선의 열처리 방법에 관한 것으로, 더욱 상세하게는 강선을 인발 후 아연 도금 과정을 수행한 다음, 블루잉 처리 또는 수소취성 제거 처리 과정으로 열처리하는 방법에 관한 것으로서, 종래의 강선을 인발 후 블루잉 처리 및 아연 도금 후 수소취성 제거 처리로 이루어진 열처리 방법에 비해 기계적 강도를 향상시킬 수 있을 뿐만 아니라, 열처리 공정 생략에 따른 원가 절감 및 물류 이동상의 문제 해결할 수 있다.The present invention relates to a method for heat treatment of a steel wire for automotive wire clamp, and more particularly, to a method of heat-treating a steel wire after drawing and performing a galvanizing process, followed by a bluing treatment or a hydrogen embrittlement removal treatment process. Compared to the heat treatment method consisting of the bluing treatment after drawing the steel wire and the hydrogen embrittlement removal treatment after galvanizing, it is possible not only to improve the mechanical strength, but also to solve the problem of cost reduction and logistics mobility due to the omission of the heat treatment process.

Description

자동차 와이어 클램프용 강선의 열처리 방법{Method of heat treatment of steel wire for car wire clamp} Method of heat treatment of steel wire for car wire clamp

본 발명은 자동차 와이어 클램프용 강선의 열처리 방법에 관한 것으로, 더욱 상세하게는 강선을 인발 후 아연 도금 과정을 수행한 다음, 블루잉 처리 또는 수소취성 제거 처리 과정으로 열처리하는 방법에 관한 것이다.The present invention relates to a heat treatment method for a steel wire clamp for automotive wire clamps, and more particularly, to a method of heat-treating a steel wire after drawing and performing a galvanizing process, followed by a bluing process or a hydrogen embrittlement removing process.

종래 자동차 부품에서 스프링 특성을 요하는 와이어 클램프(wire clamp)는 SWP 재의 강선을 사용하며, 상기 강선의 소재, 열처리 방법 및 표면처리 방법에 따라 그 기계적 강도가 다르게 나타난다.Wire clamps that require spring characteristics in conventional automotive parts use steel wires of SWP material, and their mechanical strengths vary according to materials, heat treatment methods, and surface treatment methods of the steel wires.

종래 강선의 제조 방법은 도 1에 나타낸 바와 같이, 강선을 인발한 후 블루잉 처리하고, 아연 도금 후 수소취성 제거 처리하는 과정으로 이루어져 있다.As shown in FIG . 1 , a conventional steel wire manufacturing method includes a process of drawing a steel wire and then bluing it, and removing hydrogen embrittlement after zinc plating.

상기 블루잉 처리는 180∼210℃에서 30∼120 분 열처리하며, 이와 같이 저온에서의 가열은 강선의 국부적인 변형을 제거하며, 시효경화 현상에 의한 탄성 한계를 상승 시키며 또한 피로 특성을 현저하게 개선하는 과정이다The bluing treatment is heat-treated at 180 to 210 ° C. for 30 to 120 minutes, and thus heating at low temperature eliminates local deformation of the steel wire, raises the elastic limit due to aging hardening and significantly improves the fatigue characteristics. It's a process

또한, 아연 도금 후 수소취성 제거 처리는 190∼210℃에서 60∼180 분 동안 열처리를 실시하였다.In addition, the hydrogen embrittlement removal treatment after zinc plating was subjected to a heat treatment at 190 to 210 ℃ for 60 to 180 minutes.

종래의 자동차용 강선의 제조 방법은 상기 두 과정의 열처리 과정을 모두 실시해야 하므로 제조원가가 높아지며, 또한 강선 제조공장과 아연 도금 공장은 보통 다른 공장이므로 물류 이동상의 문제가 발생한다.In the conventional method for manufacturing automotive steel wire, the manufacturing cost is increased because both heat treatment processes of the above process are performed, and the steel wire manufacturing plant and the galvanizing plant are usually different plants, which causes problems in logistics mobility.

하기 표 1은 강선을 블루잉 열처리 한 후의 기계적 강도를 나타낸 것이다. Table 1 shows the mechanical strength after heat treatment of the steel wire.

블루잉 열처리 후 기계적 강도 측정Mechanical strength measurement after bluing heat treatment 열처리온도Heat treatment temperature 열처리시간(분)Heat treatment time (minutes) 인장강도(㎏f/㎟)Tensile Strength (㎏ f / ㎠) 항복강도(㎏f/㎟)Yield strength (㎏ f / ㎠) 신율(%)% Elongation 원소재Raw materials 183.3183.3 140.2140.2 3.53.5 180℃180 ℃ 120120 198.1198.1 187.9187.9 1.91.9 180℃180 ℃ 180180 197.5197.5 182.4182.4 2.42.4 200℃200 ℃ 3030 198.5198.5 168.7168.7 2.62.6 200℃200 ℃ 6060 198.3198.3 184.8184.8 2.52.5 250℃250 ℃ 3030 196.0196.0 185.8185.8 2.32.3 250℃250 ℃ 6060 195.0195.0 181.9181.9 4.44.4

상기 표 1에 따르면, 180℃에서 2 시간 또는 3 시간 열처리하여 기계적 강도를 측정한 결과 다른 온도 범위보다 더욱 우수하게 측정되었으며, 특히 상기 온도는 수소취성 제거 처리 온도 및 시간과 동일하며, 또한 수소취성 제거 처리와 비교하여 기계적 강도도 유사하게 측정된다.According to Table 1 , the mechanical strength was measured by heat treatment at 180 ° C. for 2 hours or 3 hours, which was better than other temperature ranges. In particular, the temperature was the same as the hydrogen embrittlement removal treatment temperature and time, and also hydrogen embrittlement. Compared with the removal treatment, the mechanical strength is similarly measured.

이로 인해 원가적 측면에서 종래의 강선을 인발 후 블루잉 열처리를 삭제하고, 아연 도금 후 특정한 조건에서 수소취성 제거 처리 또는 블루잉 열처리 수행이 가능해진다.This eliminates the bluing heat treatment after drawing the conventional steel wire in terms of cost, and enables hydrogen embrittlement removal treatment or bluing heat treatment under specific conditions after zinc plating.

이에 본 발명자들은 상기한 문제점을 해결하고 간단한 공정을 통해 기계적 물성이 우수한 자동차용 강선을 개발하고자 연구한 결과, 종래의 강선 제조 방법에서 두 과정의 열처리 방법의 온도 및 시간이 서로 유사하여 강선을 인발 후 블루잉 처리를 생략하고, 아연 도금 후 열처리를 최적의 조건으로 블루잉 처리 또는 수소취성 제거 처리 과정으로 실시하여 자동차 와이어 클램프용 강선을 제조하였고, 상기 제조된 자동차 와이어 클램프용 강선이 기계적 강도 향상은 물론 열처리 공정 생략에 따른 원가 절감 및 물류 이동상의 문제를 해결할 수 있음을 알아내어 본 발명을 완성하였다.Therefore, the present inventors have solved the above problems and developed a steel wire having excellent mechanical properties through a simple process. As a result, in the conventional steel wire manufacturing method, the temperature and time of two heat treatment methods are similar to each other, and thus the steel wire is drawn. After the bluing treatment was omitted, the heat treatment after galvanization was carried out by the bluing treatment or the hydrogen embrittlement removal treatment to the optimum conditions to produce a steel wire clamp for automotive wire clamp, the steel wire for automotive wire clamp to improve the mechanical strength Of course, the present invention has been completed by finding out that the problem of cost reduction and logistics movement due to omission of the heat treatment process can be solved.

본 발명의 목적은 기계적 강도가 향상된 자동차 와이어 클램프용 강선의 열처리 방법을 제공하는 것이다. It is an object of the present invention to provide a method for heat treatment of steel wire clamps for automobile wires with improved mechanical strength.

상기한 목적을 달성하기 위하여, 본 발명은 강선을 인발 후 아연 도금 과정을 거친 와이어 클램프 강선을 블루잉 처리 또는 수소취성 제거 처리 과정으로 열처리하는 자동차 와이어 클램프용 강선의 열처리 방법을 제공한다.In order to achieve the above object, the present invention provides a method for heat treatment of automotive wire clamp steel wire to heat-treated the wire clamp steel wire after the galvanizing process after drawing the steel wire by bluing or hydrogen embrittlement removal treatment.

이하 본 발명을 첨부 도면에 의해 더욱 상세히 설명한다.Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

도 2에서 보는 바와 같이, 본 발명의 자동차 와이어 클램프용 강선의 제조 방법은 인발 단계를 거친 강선을 아연 도금 후 블루잉 처리 또는 수소취성 제거 처리이 열처리를 거쳐 제조된다.As shown in FIG. 2, in the method for manufacturing a wire clamp for automobile wire clamp according to the present invention, a bluing treatment or a hydrogen embrittlement removal treatment after galvanizing a steel wire that has been drawn is manufactured through heat treatment.

자동차 와이어 클램프용 강선은 스프링 특성을 요하며, 특히 우수한 신율 및 인장 강도 특성이 요구된다. 본 발명에서는 종래 2단계로 블루잉 및 수소취성 제거 열처리 방법을 아연 도금 후 170∼350℃에서 30∼180 분 동안 열처리를 수행하게 된다. 상기 조건에서 열처리된 본 발명의 강선의 신율 및 인장 강도 등 우수한 기계적 물성을 나타낸다.특히, 탄소함유량이 낮은 0.6∼0.95 중량%의 저탄소강에서는 350℃ 전후에서 재결정이 일어나기 시작하므로, 재결정후 결정립의 성장에 의해 강도가 떨어지는 것을 방지하기 위해 아연 도금후 열처리 온도를 170∼300℃로 한정하는 것이 더욱 바람직하다.한편, 상기 열처리 온도를 170℃ 이하로 하면, 수소의 충분한 확산에 필요한 활성화 에너지에 미치지 못하므로 수소제거효과가 떨어짐에 주의해야 한다. Steel wire for automotive wire clamps requires spring properties, and particularly good elongation and tensile strength properties. In the present invention, the bluing and hydrogen embrittlement removal heat treatment method in the conventional two steps is carried out for 30 to 180 minutes heat treatment at 170 ~ 350 ℃ after galvanizing. It exhibits excellent mechanical properties such as elongation and tensile strength of the steel wire of the present invention heat-treated under the above conditions. Particularly, in the low carbon steel having a low carbon content of 0.6 to 0.95% by weight, recrystallization starts around 350 ° C. In order to prevent the strength from dropping by growth, it is more preferable to limit the heat treatment temperature after galvanization to 170 to 300 DEG C. On the other hand, when the heat treatment temperature is set to 170 DEG C or lower, it does not reach the activation energy required for sufficient diffusion of hydrogen. It should be noted that the effect of removing hydrogen is reduced.

본 발명의 와이어 클램프용 소재는 C 0.6∼0.95 중량%, Si 0.12∼0.32 중량%, Mn 0.3∼0.9 중량%, P 0.025 중량% 이하, S 0.025 중량% 이하, Cu 0.2 중량% 이하 및 Fe가 잔부로 구성되어 있으며, 강선을 인발하는 방법 및 아연 도금하는 방법은 통상적인 방법을 따른다.The wire clamp material of the present invention is C 0.6-0.95 wt%, Si 0.12-0.32 wt%, Mn 0.3-0.9 wt%, P 0.025 wt% or less, S 0.025 wt% or less, Cu 0.2 wt% or less, and Fe It consists of a part, and the method of drawing a steel wire and the method of galvanizing follow a conventional method.

본 발명의 열처리 방법에 의해 제조된 자동차용 강선은 인장 강도가 종래의 열처리 방법에 의해 제조된 강선 보다 인장 강도가 10 % 이상 우수하였으며, 하기 실시예에 따라 실험예의 인장 강도는 190.9 ㎏f/㎟이며, 실시예 1의 블루잉 열처리 후 인장 강도는 198.1 ㎏f/㎟ 및 실시예 2의 수소취성 제거 처리 후 인장 강도는 197.9 ㎏f/㎟ 나타났다.The steel wire for automobile produced by the heat treatment method of the present invention was 10% or more superior in tensile strength than the steel wire produced by the conventional heat treatment method, the tensile strength of the experimental example 190.9 kgf / ㎜ according to the following examples The tensile strength after the bluing heat treatment of Example 1 was 198.1 kgf / mm 2 and the tensile strength after the hydrogen embrittlement removal treatment of Example 2 was 197.9 kgf / mm 2.

또한, 제품 상태에서 인장 시험을 하는 경우, 인장 강도가 2배 정도 향상되었으며, 특히 택시의 공기 청정기 클램프(air cleaner clamp)로 시험한 결과 현재 사용하는 것 보다 수명이 6 배 이상 증가함을 알 수 있다.In addition, when the tensile test in the product state, the tensile strength is improved by about 2 times, especially the test by the air cleaner clamp of the cab shows that the life is more than six times longer than the current use. have.

본 발명의 열처리 방법은 디젤 엔진의 스프링-주사 노즐(spring-injection nozzle), 공기 청정기 클램프(air cleaner clamp) 및 와이어-도어 창 조절기(wire-door window regulator) 등을 제조하는 데 바람직하다.The heat treatment method of the present invention is preferable for manufacturing spring-injection nozzles, air cleaner clamps, wire-door window regulators, etc. of diesel engines.

이하 본 발명의 실시예를 다음에 의하여 설명한다.An embodiment of the present invention will be described below.

그러나, 본 발명이 실시예에 의해 한정되는 것은 아니다.However, the present invention is not limited by the examples.

<실시예 1> 강선의 제조 1Example 1 Manufacture of Steel Wire 1

C 0.6∼0.65 중량%, Si 0.12∼0.32 중량%, Mn 0.3∼0.9 중량%, P 0.025 중량% 이하, S 0.025 중량% 이하, Cu 0.2 중량% 이하 및 Fe 가 잔부인 강선을 이용하여 인발한 후 MFZn28-D로 아연 도금하였다. 180℃에서 100 분 동안 블루잉 열처리를 수행하여 자동차용 강선을 제조하였다C 0.6-0.65 wt%, Si 0.12-0.32 wt%, Mn 0.3-0.9 wt%, P 0.025 wt% or less, S 0.025 wt% or less, Cu 0.2 wt% or less and Fe drawn with a remainder Zinc plated with MFZn28-D. An automotive steel wire was prepared by performing a bluing heat treatment at 180 ° C. for 100 minutes.

<실시예 2> 강선의 제조 2Example 2 Production of Steel Wire 2

상기 실시예 1에서 180℃에서 100 분 동안 수소취성제거 처리를 수행한 것을 제외하고 상기 실시예 1과 동일하게 수행하였다.In Example 1 was carried out in the same manner as in Example 1 except that the hydrogen embrittlement removal treatment at 180 ℃ 100 minutes.

<비교예 1>Comparative Example 1

C 0.6∼0.65 중량%, Si 0.12∼0.32 중량%, Mn 0.3∼0.9 중량%, P 0.025 중량% 이하, S 0.025 중량% 이하, Cu 0.2 중량% 이하 및 Fe 가 잔부인 강선을 이용하여 인발한 후 열처리 단계는 180℃에서 100 분 동안 블루잉 열처리를 수행하였다. 그리고, 아연 도금은 MFZn28-D로 수행한 후. 200℃에서 100 분 동안 수소취성 제거 처리를 수행하였다.C 0.6-0.65 wt%, Si 0.12-0.32 wt%, Mn 0.3-0.9 wt%, P 0.025 wt% or less, S 0.025 wt% or less, Cu 0.2 wt% or less and Fe drawn with a remainder The heat treatment step was followed by a bluing heat treatment at 180 ° C. for 100 minutes. And after galvanizing was performed with MFZn28-D. Hydro embrittlement removal treatment was performed at 200 ° C. for 100 minutes.

<실험예> 기계적 강도 측정Experimental Example Measurement of Mechanical Strength

상기 제조된 자동차 와이어 클램프용 강선의 인장강도, 항복강도, 연신율 및 경도를 확인하기 위하여, 시편을 제조한 다음 실험을 실시하였다. 이 때 측정 결과는 하기 표 2와 같다.In order to check the tensile strength, yield strength, elongation and hardness of the manufactured steel wire clamp steel wire, the specimen was prepared and then subjected to the experiment. In this case, the measurement results are shown in Table 2 below.

인장강도(㎏f/㎟)Tensile Strength (㎏ f / ㎠) 항복강도(㎏f/㎟)Yield strength (㎏ f / ㎠) 연신율(%)Elongation (%) 경도(Hv)Hardness (Hv) 실시예 1Example 1 198.1198.1 187.9187.9 1.91.9 -- 실시예 2Example 2 197.9197.9 192.3192.3 2.22.2 524524 비교예Comparative example 190.9190.9 173.5173.5 6.26.2 514514 원소재Raw materials 183.3183.3 140.2140.2 3.53.5 499499

상기 표 2에 알 수 있듯이, 종래 열처리 방법으로 제조한 강선(비교예) 보다 본 발명의 블루잉 처리(실시예 1)또는 수소취성 제거 처리(실시예 2)로 이루어진 강선이 인장 강도가 약 10 ㎏f/㎟ 이상 우수하게 나타났다.As can be seen in Table 2 , the tensile strength of the steel wire composed of the bluing treatment (Example 1) or the hydrogen embrittlement removal treatment (Example 2) of the present invention than the steel wire prepared by the conventional heat treatment method (Comparative Example) It was excellent in more than kgf / mm 2.

또한, 상기 제조된 강선을 제품 상태에서 인장시험을 실시한 결과, 인장 강도가 2배 정도 향상되어 종래의 열처리 방법에 의한 제품의 수명이 한 달 정도였으나, 본 발명에 의한 제품은 6개월 이상 사용이 가능하다.In addition, as a result of performing a tensile test on the manufactured steel wire in the state of the product, the tensile strength was improved by about 2 times, so that the life of the product by the conventional heat treatment method was about one month, but the product according to the present invention was used for 6 months or more. It is possible.

상술한 바와 같이, 본 발명의 열처리 방법에 의한 자동차 와이어 클램프용 강선은 종래 열처리 방법에 비해 열처리 과정이 단축되어 원가 절감 및 물류 이동상의 문제를 해결 및 강도 향상의 효과가 있어 자동차 와이어 클램프용 강선의 제조에 유용하게 이용될 수 있다.As described above, the automotive wire clamp steel wire according to the heat treatment method of the present invention has a shorter heat treatment process compared to the conventional heat treatment method to solve the problem of cost reduction and logistics movement and improve the strength of the automotive wire clamp steel wire It can be usefully used for manufacturing.

도 1은 종래의 자동차 와이어 클램프용 강선의 제조방법을 나타낸 도면이고, 1 is a view showing a manufacturing method of a steel wire clamp for a conventional automotive wire clamp,

도 2는 본 발명의 자동차 와이어 클램프용 강선의 제조방법을 나타낸 도면이다. 2 is a view showing a method for manufacturing a steel wire for automotive wire clamp of the present invention.

Claims (3)

C 0.6∼0.95 중량%, Si 0.12∼0.32 중량%, Mn 0.3∼0.9 중량%, P 0.025 중량% 이하, S 0.025 중량% 이하, Cu 0.2 중량% 이하 및 Fe가 잔부로 구성되는 자동차 와이어 클램프용 강선의 열처리 방법에 있어서,C 0.6-0.95 wt%, Si 0.12-0.32 wt%, Mn 0.3-0.9 wt%, P 0.025 wt% or less, S 0.025 wt% or less, Cu wire 0.2 wt% or less In the heat treatment method of, 인발 후 아연 도금된 강선을 170∼300℃에서 30∼180 분 동안 블루잉 처리 또는 수소취성 제거 처리 중에서 선택된 방법으로 열처리 하는 것을 특징으로 하는 자동차용 강선의 열처리 방법.After drawing, the galvanized steel wire is heat-treated at 170 to 300 ° C. for 30 to 180 minutes by a method selected from a bluing treatment or a hydrogen embrittlement removal treatment. 삭제delete 삭제delete
KR10-2001-0070868A 2001-11-14 2001-11-14 Method of heat treatment of steel wire for car wire clamp KR100471807B1 (en)

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Citations (4)

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Publication number Priority date Publication date Assignee Title
JPS6130244A (en) * 1984-07-23 1986-02-12 Sumitomo Metal Ind Ltd Wire using zinc plating steel wire
JPH03249129A (en) * 1990-02-28 1991-11-07 Nippon Steel Corp Production of plated steel wire having high strength and high toughness
JPH10110216A (en) * 1996-10-04 1998-04-28 Nippon Steel Corp High strength steel wire for acsr, reduced in iron loss in medium and low magnetic field
KR20000041678A (en) * 1998-12-23 2000-07-15 이구택 Method of manufacturing steel wires for bead wire

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6130244A (en) * 1984-07-23 1986-02-12 Sumitomo Metal Ind Ltd Wire using zinc plating steel wire
JPH03249129A (en) * 1990-02-28 1991-11-07 Nippon Steel Corp Production of plated steel wire having high strength and high toughness
JPH10110216A (en) * 1996-10-04 1998-04-28 Nippon Steel Corp High strength steel wire for acsr, reduced in iron loss in medium and low magnetic field
KR20000041678A (en) * 1998-12-23 2000-07-15 이구택 Method of manufacturing steel wires for bead wire

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