KR20020053670A - A alloy steel for automobile knuckle and preparing method thereof - Google Patents

A alloy steel for automobile knuckle and preparing method thereof Download PDF

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KR20020053670A
KR20020053670A KR1020000083382A KR20000083382A KR20020053670A KR 20020053670 A KR20020053670 A KR 20020053670A KR 1020000083382 A KR1020000083382 A KR 1020000083382A KR 20000083382 A KR20000083382 A KR 20000083382A KR 20020053670 A KR20020053670 A KR 20020053670A
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South Korea
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alloy steel
weight
knuckle
knuckles
automobile
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KR1020000083382A
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Korean (ko)
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박현수
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이계안
현대자동차주식회사
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Priority to KR1020000083382A priority Critical patent/KR20020053670A/en
Publication of KR20020053670A publication Critical patent/KR20020053670A/en

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—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

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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)
  • Heat Treatment Of Steel (AREA)
  • Forging (AREA)

Abstract

PURPOSE: A method for manufacturing an alloy steel for automobile knuckle having superior microstructure and extended durability without heat treatment is provided. CONSTITUTION: The manufacture method of an alloy steel for automobile knuckle includes the steps of hot forging an alloy steel comprising C 0.15 to 0.3 wt.%, Si 0.1 to 0.4 wt.%, Mn 1 to 3 wt.%, S 0.01 to 0.07 wt.%, Cr 0.1 to 0.5 wt.%, Mo 0.01 to 0.05 wt.%, Ti 0.01 to 0.05 wt.%, Vd 0.1 to 0.4 wt.% and N 0.005 to 0.02 wt.% and a balance of Fe; air-cooling of the hot forged alloy steel at a cooling rate of 0.5 to 3°C/sec.

Description

자동차 너클용 합금강 및 그의 제조방법{A alloy steel for automobile knuckle and preparing method thereof}A alloy steel for automobile knuckle and preparing method

본 발명은 자동차 너클용 합금강 및 그의 제조방법에 관한 것으로서, 더욱 상세하게는 자동차의 너클용 합금을 제조함에 있어서, 철을 주성분으로 하고, 여기에 탄소, 규소, 망간, 황, 크롬, 몰리브덴, 티타늄, 바나듐, 질소를 첨가한 초고강도미세립 철강을 이용하여 열간단조 및 제어냉각을 실시함으로써 우수한 미세조직을 형성하여 내구수명과 안전율이 현저하게 개선되며, 열처리공정을 생략함으로써 경제적이며 환경친화적인 자동차 너클용 합금강 및 그의 제조방법에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alloy steel for automobile knuckles and a method for manufacturing the same. More specifically, in manufacturing an alloy for automobile knuckles, iron is the main component, and carbon, silicon, manganese, sulfur, chromium, molybdenum, titanium Hot forging and controlled cooling using ultra-high strength fine grained steel with vanadium and nitrogen to form excellent microstructure, significantly improving durability life and safety and eliminating heat treatment process. An alloy steel for knuckles and a method for producing the same.

일반적으로 너클은 자동차 바퀴를 본체에 고정시키는 부품으로서 차량운행시 안전과는 직접연관이 되므로 그 내구성이 매우 중요하다.In general, the knuckle is a part that fixes the car wheels to the main body, so its durability is very important because it is directly related to safety during vehicle operation.

기존에 사용되는 너클은 주로 주철 및 탄소강으로 제작되어 왔었다. 그러나 주철제 너클은 소재가격이 싼 잇점이 있으나, 강 대비 강도가 낮고 특히 내충격성이 열악하므로 조기 파손의 위험성이 높다. 따라서, 비교적 덜 가혹한 작동환경인 경차, 소형차용으로 한정적용하고 있다. 그러나, 소형차에 사용되는주철제 너클의 경우 소재특성상 단소재대비 NVH성능이 떨어지는 단점이 있다.Previously used knuckles have been mainly made of cast iron and carbon steel. However, cast iron knuckles have the advantage of low material prices, but they have a low risk compared to steel and are particularly poor in impact resistance. Therefore, the present invention is limited to light and small vehicles, which are relatively less severe operating environments. However, cast iron knuckles used in compact cars have a disadvantage in that NVH performance is lower than that of a single material due to material characteristics.

탄소강제 너클은 중·대형 승용차 및 상용차에 적용되고 있다. 그러나, 종래 탄소강은 인장강도 80 ∼ 90 kg/min급이 주로 사용되고 있어, 최근의 차량경량화를 위한 최적설계, 중량절감에 따른 부품치수 슬림화로 인한 내구강도 저하 및 안전율 감소의 문제가 있다. 따라서 기존소재대비 최소 10 ∼ 20 %의 강도향상이 요구되어지고 있다.Carbon steel knuckles are applied to medium and large passenger cars and commercial vehicles. However, the conventional carbon steel is mainly used in the 80 ~ 90 kg / min class of tensile strength, there is a problem of lowering the oral cavity and the safety factor due to the slim design of the component size according to the recent optimal design for weight reduction of the vehicle. Therefore, strength improvement of at least 10-20% is required compared to existing materials.

또한 종래 너클 소재는 소재단조후 미세조직 제거를 위한 후열처리공정을 부가적용해야 하므로 싸이클 타임(cycle time) 증가에 따른 생산비용 부담이 크다.In addition, since the conventional knuckle material must additionally apply a post-heat treatment process for removing microstructure after material forging, the production cost burden is increased due to an increase in cycle time.

따라서, 상기한 문제점들을 해결하기 위해 종래에 비하여 내구수명과 안전율이 현저하게 개선된 고강도의 너클을 간단하고 경제적으로 제조할 수 있는 너클 재질의 개발이 절실히 요구되고 있는 실정이다.Therefore, in order to solve the above problems, the development of a knuckle material capable of producing a high-strength knuckle, which has a markedly improved durability and safety factor, can be simply and economically compared to the prior art.

이에, 본 발명은 위와 같이 종래의 공법에 의해 제조되는 너클 재질의 단점과 공정상의 문제점 등을 개선하고, 내구수명과 안전율이 현저하게 개선된 고강도의 너클 재질을 제조하기 위하여 연구 노력한 결과, 종래의 너클 제조공정에 적용된 바 없는 초고강도 합금 철강을 이용하여 단조하고, 제어냉각을 통한 미세립조직을 얻고, 또한 단조 후 열처리공정을 생략하여 원가절감의 효과를 얻음으로써, 본 발명을 완성하였다.Thus, the present invention is to improve the disadvantages and process problems of the knuckle material manufactured by the conventional method as described above, and as a result of research efforts to manufacture a high-strength knuckle material markedly improved durability life and safety, The present invention has been completed by forging using an ultra high strength alloy steel that has not been applied to a knuckle manufacturing process, obtaining a fine grain structure through controlled cooling, and obtaining an effect of cost reduction by omitting a heat treatment process after forging.

따라서, 본 발명은 내구수명과 안전율이 현저하게 개선된 고강도의 너클용합금강을 제공하는데 그 목적이 있다.Therefore, an object of the present invention is to provide a high strength knuckle alloy steel with remarkably improved durability and safety.

본 발명은 자동차 너클용 합금강에 있어서, 철을 주성분으로 하고, 탄소 0.15 ∼ 0.3 중량%, 규소 0.1 ∼ 0.4 중량%, 망간 1 ∼ 3 중량%, 황 0.01 ∼ 0.07 중량%, 크롬 0.1 ∼ 0.5 중량%, 몰리브덴 0.01 ∼ 0.05 중량%, 티타늄 0.01 ∼ 0.05 중량%, 바나듐 0.1 ∼ 0.4 중량% 및 질소 0.005 ∼ 0.02 중량%가 함유된 자동차 너클용 합금강을 그 특징으로 한다.The present invention is an alloy steel for automotive knuckles, the main component of iron, carbon 0.15 to 0.3% by weight, silicon 0.1 to 0.4% by weight, manganese 1 to 3% by weight, sulfur 0.01 to 0.07% by weight, chromium 0.1 to 0.5% by weight And alloy steel for automobile knuckle containing 0.01 to 0.05% by weight of molybdenum, 0.01 to 0.05% by weight of titanium, 0.1 to 0.4% by weight of vanadium and 0.005 to 0.02% by weight of nitrogen.

본 발명은 자동차 너클용 합금강의 제조방법에 있어서, 상기 자동차 너클용 합금강의 조성성분을 사용하여 열간단조하는 단계; 단조 후 콘베이어로 단조품을 이송시키며 0.5 ∼ 3 ℃/초로 냉각속도를 조절하여 공냉시키는 제어냉각단계;로 이루어지는 자동차 너클용 합금강의 제조방법을 또 다른 특징으로 한다.The present invention relates to a method for manufacturing an alloy steel for automobile knuckles, comprising: hot forging using a composition component of the alloy steel for automobile knuckles; After the forging transfers the forged product to the conveyor and controlled cooling step of air cooling by adjusting the cooling rate to 0.5 ~ 3 ℃ / second;

이와 같은 본 발명을 더욱 상세히 설명하면 다음과 같다.Referring to the present invention in more detail as follows.

본 발명에 따른 자동차 너클용 합금강에 함유되는 각 조성성분에 대하여 보다 구체적으로 설명하면 다음과 같다.Hereinafter, the respective composition components contained in the alloy steel for automobile knuckles according to the present invention will be described in more detail.

본 발명에서 사용하는 탄소는 강도 및 소입성을 향상시키기 위하여 첨가되며, 탄소의 함량은 전체 너클 합금강에 대하여 0.15 ∼ 3 중량% 첨가된다.Carbon used in the present invention is added to improve strength and hardenability, and the carbon content is added in an amount of 0.15 to 3% by weight based on the whole knuckle alloy steel.

본 발명에서 사용하는 망간은 강도 및 소려저항성을 향상시키기 위하여 첨가되며, 망간의 함량은 전체 너클 합금강에 대하여 1 ∼ 3 중량% 첨가된다.Manganese used in the present invention is added in order to improve strength and roughness resistance, and the content of manganese is added in an amount of 1 to 3% by weight based on the whole knuckle alloy steel.

본 발명에서 사용하는 황은 절삭 가공성을 향상시키기 위하여 첨가되며, 황의 함량은 전체 너클 합금강에 대하여 0.01 ∼ 0.07 중량% 첨가된다.Sulfur used in the present invention is added to improve the machinability, and the sulfur content is added in an amount of 0.01 to 0.07% by weight based on the whole knuckle alloy steel.

본 발명에서 사용하는 크롬은 소입성 증대, 강도 및 소려저항성을 향상시키기 위하여 첨가되며, 크롬의 함량은 전체 너클 합금강에 대하여 0.1 ∼ 0.5 중량% 첨가된다.Chromium used in the present invention is added in order to increase the hardenability, improve strength and roughness resistance, and the chromium content is added in an amount of 0.1 to 0.5% by weight based on the whole knuckle alloy steel.

본 발명에서 사용하는 몰리브덴(Mo)은 내열, 내마모성, 소입성 증대, 소려저항성을 향상시키기 위하여 첨가되며, 몰리브덴의 함량은 전체 너클 합금강에 대하여 0.01 ∼ 0.05 중량% 첨가된다.Molybdenum (Mo) used in the present invention is added to improve heat resistance, abrasion resistance, hardenability, and sorrow resistance, the content of molybdenum is added 0.01 to 0.05% by weight relative to the whole knuckle alloy steel.

본 발명에서 사용하는 티타늄은 미세화 촉진 및 탄질화물을 형성시키기 위하여 첨가되며, 티타늄의 함량은 전체 너클 합금강에 대하여 0.01 ∼ 0.05 중량% 첨가된다. 만일 티타늄의 함량이 0.01 중량% 미만이면 결정립 미세화가 용이하지 않으며, 질화물 석출에 따른 강화효과를 기대할 수 없는 문제가 발생하고, 0.05 중량% 보다 과량이면 미세 균일 분산에 의한 질화물 석출강화효과를 기대하기 어려우므로 바람직하지 못하다.Titanium used in the present invention is added to promote micronization and to form carbonitride, and the content of titanium is added in an amount of 0.01 to 0.05% by weight based on the whole knuckle alloy steel. If the titanium content is less than 0.01% by weight, it is not easy to refine the grains, and the reinforcing effect due to nitride precipitation cannot be expected. If the content of titanium is more than 0.05% by weight, it is expected to enhance the nitride precipitation strengthening effect due to fine uniform dispersion. It is difficult and undesirable.

본 발명은 자동차 너클용 합금강의 제조방법에 있어서, 상기 자동차 너클용 합금강의 조성성분을 사용하여 열간단조하는 단계; 단조 후 콘베이어로 단조품을 이송시키며 0.5 ∼ 3 ℃/초로 냉각속도를 조절하여 공냉시키는 제어냉각단계;로 이루어지는 자동차 너클용 합금강의 제조방법을 포함한다.The present invention relates to a method for manufacturing an alloy steel for automobile knuckles, comprising: hot forging using a composition component of the alloy steel for automobile knuckles; It includes the method of manufacturing an alloy knuckle for automobile knuckle consisting of; a controlled cooling step of transferring the forged product to the conveyor after forging and air cooling by adjusting the cooling rate to 0.5 ~ 3 ℃ / sec.

이상과 같이 너클 합금 소재의 조성과 함량을 최적범위로 조절함으로써, 내구수명과 안전율이 개선되며, 또한 상기한 원료를 이용하여 열간단조한 후 제어냉각 과정을 거치며 후열처리공정을 생략하여 제조함으로써 경제적인 자동차 너클의합금강을 얻을 수 있다.As described above, by adjusting the composition and content of the knuckle alloy material to the optimum range, the durability life and safety factor is improved, and also by hot forging using the above raw materials, through the controlled cooling process and by eliminating the post-heat treatment process economical Alloy steel of car knuckle.

이하, 본 발명을 실시예에 의거하여 더욱 상세하게 설명하겠는바, 본 발명이 실시예에 의해 한정되는 것은 아니다.Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited by Examples.

실시예 1.Example 1.

다음 표 1에 나타낸 바와 같은 조성비로 소재를 제강하여 1100 ∼ 1200 ℃에서 단조한 후 제어냉각을 0.5 ∼ 3 ℃/초로 실시하며, 후열처리공정을 생략하여 너클용 합금강을 제조하였다.Next, as shown in Table 1, the material was steel-made and forged at 1100 to 1200 ° C., and then controlled cooling was performed at 0.5 to 3 ° C./second, and the post-heat treatment step was omitted to prepare knuckle alloy steel.

비교예 1.Comparative Example 1.

다음 표 1에 나타낸 바와 같은 조성비로 소재를 제강하여 1100 ∼ 1200 ℃에서 단조한 후, 상온까지 방냉을 실시한 다음, 후열처리 공정으로 800 ∼ 900 ℃에서 1 ∼ 2 시간 동안 용체화처리 후 유냉하고 다시 500 ∼ 650 ℃에서 소려를 행하여 제조하였다.Next, the material is steel-making at a composition ratio as shown in Table 1, forged at 1100 to 1200 ° C., and then cooled to room temperature, followed by solution treatment at 800 to 900 ° C. for 1 to 2 hours, followed by oil cooling and then again. It produced by carrying out at 500-650 degreeC.

실험예 1: 물성측정Experimental Example 1: Measurement of Properties

상기 실시예 1 및 비교예 1에 따라 제조된 너클을 KS 표준측정방법을 사용하여 물성측정을 하였으며, 그 결과를 다음 표 2에 나타내었다.The knuckles prepared according to Example 1 and Comparative Example 1 were measured for physical properties using the KS standard measurement method, and the results are shown in Table 2 below.

상기 표 2의 결과로부터, 본 발명에 따른 너클은 비교예에 비해 약 20% 이상의 강도향상효과로 인한 높은 내구수명을 얻을 수 있었다.From the results of Table 2, the knuckle according to the present invention was able to obtain a high durability life due to the strength improvement effect of about 20% or more compared to the comparative example.

상술한 바와 같이, 본 발명에 따른 초고강도 합금강 및 제어냉각을 적용한 너클은 종래소재 대비 20%이상의 강도향상효과로 인한 높은 내구수명을 얻을 수 있으며, 최적설계를 적용할 수 있어 종래 소재 대비 15%이상 경량화를 얻을 수 있다. 또한 열간단조 후, 부가 열처리 생략으로 인한 원가절감이 가능함은 물론 생산성향상에 크게 기여할 수 있어 널리 효과적으로 활용될 수 있다.As described above, the knuckle to which the ultra-high strength alloy steel and the control cooling according to the present invention are applied can obtain a high durability life due to the strength improvement effect of 20% or more compared to the conventional material, and 15% compared to the conventional material because the optimum design can be applied. Light weight can be obtained. In addition, after hot forging, it is possible to reduce the cost due to omission of additional heat treatment, as well as contribute greatly to productivity, and thus can be widely used.

Claims (2)

자동차 너클용 합금강에 있어서, 철을 주성분으로 하고, 탄소 0.15 ∼ 0.3 중량%, 규소 0.1 ∼ 0.4 중량%, 망간 1 ∼ 3 중량%, 황 0.01 ∼ 0.07 중량%, 크롬 0.1 ∼ 0.5 중량%, 몰리브덴 0.01 ∼ 0.05 중량%, 티타늄 0.01 ∼ 0.05 중량%, 바나듐 0.1 ∼ 0.4 중량% 및 질소 0.005 ∼ 0.02 중량%가 함유되어 있는 것임을 특징으로 하는 자동차 너클용 합금강.Alloy steel for automobile knuckles, with iron as the main component, carbon 0.15 to 0.3% by weight, silicon 0.1 to 0.4% by weight, manganese 1 to 3% by weight, sulfur 0.01 to 0.07% by weight, chromium 0.1 to 0.5% by weight, molybdenum 0.01 Alloy steel for automotive knuckles, characterized by containing from 0.05 to 0.05% by weight, from 0.01 to 0.05% by weight of titanium, from 0.1 to 0.4% by weight of vanadium and from 0.005 to 0.02% by weight of nitrogen. 자동차 너클용 합금강의 제조방법에 있어서,In the manufacturing method of alloy steel for automobile knuckles, 제 1 항에 따른 자동차 너클용 합금강의 조성성분을 사용하여 열간단조하는 단계;Hot forging using the composition of the alloy steel for automobile knuckle according to claim 1; 단조 후 콘베이어로 단조품을 이송시키며 0.5 ∼ 3 ℃/초로 냉각속도를 조절하여 공냉시키는 제어냉각단계;A controlled cooling step of transferring the forged product to the conveyor after forging and adjusting the cooling rate to 0.5 to 3 ° C./sec for air cooling; 로 이루어지는 자동차 너클용 합금강의 제조방법.Method for producing an alloy steel for automotive knuckles.
KR1020000083382A 2000-12-27 2000-12-27 A alloy steel for automobile knuckle and preparing method thereof KR20020053670A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63162810A (en) * 1986-12-26 1988-07-06 Kawasaki Steel Corp Manufacture of non-heattreated hot forged product
JPS64220A (en) * 1987-06-23 1989-01-05 Nippon Steel Corp Production of hot forged and non-tempered parts for machine structural purpose
JPH01176031A (en) * 1987-12-28 1989-07-12 Kawasaki Steel Corp Manufacture of non-heattreated steel for hot forging
JPH03183739A (en) * 1989-12-13 1991-08-09 Nippon Steel Corp Manufacture of high toughness non-heat treated steel for hot forging, its bar steel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63162810A (en) * 1986-12-26 1988-07-06 Kawasaki Steel Corp Manufacture of non-heattreated hot forged product
JPS64220A (en) * 1987-06-23 1989-01-05 Nippon Steel Corp Production of hot forged and non-tempered parts for machine structural purpose
JPH01176031A (en) * 1987-12-28 1989-07-12 Kawasaki Steel Corp Manufacture of non-heattreated steel for hot forging
JPH03183739A (en) * 1989-12-13 1991-08-09 Nippon Steel Corp Manufacture of high toughness non-heat treated steel for hot forging, its bar steel

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