KR20030096892A - The Manufacturing method for high strength connecting rod of large commercial vehicle - Google Patents

The Manufacturing method for high strength connecting rod of large commercial vehicle Download PDF

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KR20030096892A
KR20030096892A KR1020020033987A KR20020033987A KR20030096892A KR 20030096892 A KR20030096892 A KR 20030096892A KR 1020020033987 A KR1020020033987 A KR 1020020033987A KR 20020033987 A KR20020033987 A KR 20020033987A KR 20030096892 A KR20030096892 A KR 20030096892A
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connecting rod
weight
vanadium
manufacturing
titanium
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KR1020020033987A
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Korean (ko)
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정승철
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현대자동차주식회사
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Publication of KR20030096892A publication Critical patent/KR20030096892A/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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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 Articles (AREA)

Abstract

PURPOSE: A non quenched and tempered steel composition is provided to improve strength by adding manganese and boron to low carbon steel and obtain non-heat treatment characteristics by adding titanium, niobium and vanadium, and a manufacturing method of connecting rod for large automobile engines using the same is provided. CONSTITUTION: The non quenched and tempered steel composition comprises iron (Fe) as a principal constituent, 0.10 to 0.20 wt.% of carbon (C), 0.30 wt.% or less of silicon (Si), 1.0 to 2.5 wt.% of manganese (Mn), 0.015 wt.% or less of phosphorus (P), 0.035 wt.% or less of sulfur (S), 0.01 to 0.03 wt.% of titanium (Ti), 0.10 to 0.20 wt.% of vanadium (V) and 0.02 to 0.05 wt.% of niobium (Nb), wherein the non quenched and tempered steel composition further comprises 10 to 20 ppm of boron (B). The manufacturing method of connecting rod comprises the steps of melting the alloy composition in converter under ordinary operating conditions; continuously casting the melt; hot forging the continuously cast alloy at a temperature of 1,200 deg.C when fabricating a connecting rod; and performing controlled water cooling on the hot forged alloy to the temperature range of 100 to 250 deg.C so that a matrix structure transforms to a lath martensite at an ordinary temperature, and composite carbide of vanadium, titanium and niobium is precipitation hardened inside grains.

Description

비조질강 조성물 및 이를 이용한 커넥팅로드의 제조 방법{The Manufacturing method for high strength connecting rod of large commercial vehicle}Non-manufactured steel composition and manufacturing method for connecting rod using same {The Manufacturing method for high strength connecting rod of large commercial vehicle}

본 발명은 비조질강 조성물 및 이를 이용한 커넥팅로드의 제조 방법에 관한 것으로서, 더욱 상세하게는 강도를 높이기 위해 저탄소강에 망간, 보론등을 첨가하고, 석출경화를 통한 비열처리 특성을 부여하기 위하여 티타늄 및 니오븀, 바나듐을 복합 첨가시킨 비조질강 조성물 및 이를 이용한 대형 자동차 엔진의 커넥팅 로드 제조 방법에 관한 것이다.The present invention relates to a non-coated steel composition and a method for manufacturing a connecting rod using the same. More specifically, to increase the strength of the low carbon steel to add manganese, boron, etc., and to give the specific heat treatment properties through precipitation hardening titanium and The present invention relates to an amorphous steel composition in which niobium and vanadium are added to a compound, and a method of manufacturing a connecting rod for a large automobile engine using the same.

특히, 본 발명은 마르텐사이트형의 비조질강을 활용하여, 기존의 크롬, 몰리브텐 합금강을 대체하고, 또한 제조 공정에서는 담금질 및 뜨임을 생략하고도 부품이 필요로 하는 강도 및 인성을 얻을 수 있도록 한 비조질강 및 이를 이용한 대형 자동차 엔진의 커넥팅로드 제조 방법에 관한 것이다.In particular, the present invention utilizes martensitic non-coarse steel to replace the existing chromium and molybdenum alloy steel, and also to obtain the strength and toughness required by the part without quenching and tempering in the manufacturing process. It relates to a non-steel and a method for manufacturing a connecting rod of a large automotive engine using the same.

종래의 커넥팅 로드 제조방법은 크롬 및 몰리브덴 구조용합금강(SCM440H)을 사용하여 열간 단조후, 냉각한 다음 재가열하여 담금질 및 뜨임열처리를 실시하여, 강도와 인성을 복합적으로 부여하는 제조방법이었다.Conventional connecting rod manufacturing method using a chromium and molybdenum structural alloy steel (SCM440H) after hot forging, cooling and then reheating to quench and temper heat treatment, it was a manufacturing method to give a combination of strength and toughness.

그러나, 종래의 방법에서 열간단조후 열처리를 위하여 재가열 및 냉각 뜨임 공정으로 열처리하는 등 공정이 길고 그에따른 고비용이 발생하는 단점이 있었다.However, in the conventional method, there is a disadvantage in that the process is long and accordingly a high cost such as heat treatment by a reheating and cooling tempering process for heat treatment after hot forging.

또한, 상용차와 같은 대형 자동차 엔진의 커넥팅로드는 매우 고강도를 요구하므로, 기존의 비조질강과 제조 조건으로는 목표 물성을 만족시키는데 한계가 있었다.In addition, since the connecting rod of a large vehicle engine such as a commercial vehicle requires a very high strength, there was a limit to satisfy the target properties in the existing non-quenched steel and manufacturing conditions.

이에, 본 발명은 상기와 같은 문제점을 해결하기 위하여 예의 노력한 결과, 강도를 높이기 위해 저탄소강에 망간, 보론등을 첨가하고, 석출경화를 통한 비열처리 특성을 부여하기 위하여 티타늄 및 니오븀, 바나튬을 복합 첨가하며, 또한 경도의 지나친 상승을 통한 취성의 증대와 인성의 저감 및 가공성의 저하를 방지하기 위하여 낮춘 탄소의 영향에 의한 소입성 저하를 보론을 첨가하여 보충함으로서, 고강도, 고인성의 부품을 제조할 수 있도록 한 비조질강 조성물을 제공하는데 그 목적이 있다.Thus, the present invention, as a result of the intensive efforts to solve the above problems, to increase the strength of manganese, boron, etc. added to the low carbon steel, and to give the specific heat treatment characteristics through precipitation hardening titanium and niobium, vanadium In order to produce high strength and high toughness components by adding boron, the addition of complex and supplementing the hardenability due to excessive increase of hardness, the reduction of toughness and the lowering of hardenability due to the effect of lowered carbon in order to prevent the decrease of workability. It is an object of the present invention to provide a non-coated steel composition that can be.

또한, 본 발명은 탄소의 함량을 낮추고 대신 B, Ti, V, Nb, Mn등을 정량 조절 첨가하여, 종래의 후열처리 공정을 생략하고도 요구 특성을 얻을 수 있도록 한 커넥팅 로드의 제조 방법을 제공하는데 그 목적이 있다.In addition, the present invention provides a method of manufacturing a connecting rod by lowering the content of carbon and quantitatively adding B, Ti, V, Nb, Mn, etc., so that the required characteristics can be obtained without the conventional post-heat treatment step. Its purpose is to.

상기한 목적을 달성하기 위한 본 발명은 철(Fe)을 주성분으로 하고, 탄소(C)0.10 내지 0.20 중량%, 규소(Si) 0.30 중량% 이하, 망간(Mn) 1.0 내지 2.5 중량%, 인(P) 0.015이하 중량%, 황(S) 0.035이하 중량%, 티타늄(Ti) 0.01 내지 0.03 중량%, 바나듐(V) 0.10 내지 0.20 중량%, 나요븀(Nb) 0.02내지 0.05 중량%, 보론(B) 10 내지 20ppm 이 포함되어 이루어진 것을 특징으로 하는 비조질강 조성물을 제공한다.The present invention for achieving the above object is based on iron (Fe), carbon (C) 0.10 to 0.20% by weight, silicon (Si) 0.30% by weight or less, manganese (Mn) 1.0 to 2.5% by weight, phosphorus ( P) 0.015 wt% or less, sulfur (S) 0.035 wt%, titanium (Ti) 0.01 to 0.03 wt%, vanadium (V) 0.10 to 0.20 wt%, niobium (Nb) 0.02 to 0.05 wt%, boron (B ) Provides an amorphous steel composition comprising 10 to 20ppm.

또한, 본 발명은 철(Fe)을 주성분으로 하고, 탄소(C) 0.10 내지 0.20 중량%, 규소(Si) 0.30 중량% 이하, 망간(Mn) 1.0 내지 2.5 중량%, 인(P) 0.015이하 중량%, 황(S) 0.035이하 중량%, 티타늄(Ti) 0.01 내지 0.03 중량%, 바나듐(V) 0.10 내지 0.20 중량 %, 나요븀(Nb) 0.02내지 0.05 중량 %, 보론(B) 10 내지 20 ppm 가 포함되어 조성된 합금 성분계를 통상의 조업조건으로 전로에서 용해시키고, 연속 주조한 후, 컨넥팅 로드 제작시 1200℃ 이상에서 열간 단조작업후, 100 ∼ 250℃영역까지 제어 수냉각을 실시하여 상온에서 기지조직을 레스형 마르텐사이트화시키고, 바나듐 및 티타늄, 나요븀 복합 탄화물이 입내에 석출 경화되도록 한 것을 특징으로 하는 커넥팅 로드 제조 방법을 제공한다.In addition, the present invention is based on iron (Fe), carbon (C) 0.10 to 0.20% by weight, silicon (Si) 0.30% by weight or less, manganese (Mn) 1.0 to 2.5% by weight, phosphorus (P) 0.015 or less %, Sulfur (S) 0.035 or less, titanium (Ti) 0.01 to 0.03 weight%, vanadium (V) 0.10 to 0.20 weight%, niobium (Nb) 0.02 to 0.05 weight%, boron (B) 10 to 20 ppm The alloy component system containing the component was dissolved in a converter under normal operating conditions, continuously cast, and after hot forging at 1200 ° C. or higher during fabrication of a connecting rod, controlled water cooling was performed to a region of 100 to 250 ° C. at room temperature. The present invention provides a method for manufacturing a connecting rod, characterized in that the matrix structure is leased martensite, and vanadium, titanium, and niobium composite carbides are precipitated and hardened in the mouth.

이하, 본 발명을 보다 상세하게 설명하면 다음과 같다.Hereinafter, the present invention will be described in more detail.

본 발명의 비조질강 조성물에 있어서, 탄소(C)는 강도를 증가시켜 주고 열처리를 가능하게 하는 주요 원소이지만, 너무 높으면 취성 및 경도가 증대되어 부작용이 발생되므로 다른 첨가 원소를 복함 첨가함에 따라 0.1 ∼ 0.20 중량%를 포함시켰다.In the non-coarse steel composition of the present invention, carbon (C) is a major element that increases strength and enables heat treatment, but when too high, brittleness and hardness increase, so that side effects occur. 0.20 wt%.

이때, 상기 탄소의 함량이 0.1 중량% 미만이면 기지조직을 마르텐사이트화하여 강도를 높이는데 문제가 있다.At this time, when the content of carbon is less than 0.1% by weight, there is a problem in increasing the strength by martensifying the matrix structure.

규소(Si)는 강중에 치환형 고용체 원소로서 0.30 중량%를 포함시켰는 바, 이때 0.05 중량% 미만이면 강도가 저하되고, 0.3 중량%를 초과하면 성형성이 떨어지는 문제가 있다.Silicon (Si) contained 0.30% by weight as a substituted solid solution element in the steel. At this time, if the content is less than 0.05%, the strength is lowered.

또한, 강 중에 존재하는 황의 유해함을 방지하기 위해 첨가하는 망간(Mn)은 치환형 고용체로서 역시 강판의 강도를 증가시키는 효과가 있다.In addition, manganese (Mn) added in order to prevent the harmfulness of sulfur present in the steel has the effect of increasing the strength of the steel sheet as a substituted solid solution.

이러한 망간의 함량은 1.0 ∼ 2.5 중량%를 포함시켰는 바, 이때 1.0 중량 % 미만에서는 원하는 강도를 얻을 수 없고, 2.5 중량%를 초과하면 성형성이 떨어지는 문제점이 있어 바람직하지 않다. 또한 망간은 황과 반응하여 망간황화합물을 형성 가공성을 향상시키므로 본 발명에서는 고망간계열로 개발하였다.The content of such manganese contained 1.0 to 2.5% by weight. At this time, less than 1.0% by weight of the desired strength is not obtained, if it exceeds 2.5% by weight is not preferable because there is a problem in poor formability. In addition, since manganese reacts with sulfur to improve the processability of forming a manganese sulfur compound, the present invention was developed as a high manganese series.

본 발명의 조성물 중 인(P)은 강 중에 존재시 성형성을 저하시키고 입계에 석출하여, 연성 취성 천이온도를 높여 충돌강도를 떨어뜨리므로 0.015 중량% 이하로 제한하는 것이 바람직하다.Phosphorus (P) in the composition of the present invention is preferably limited to 0.015% by weight or less because it decreases formability and precipitates at grain boundaries, thereby increasing the soft brittle transition temperature to lower the impact strength.

또한, 황(S)은 강 중에 존재시 취성을 일으키므로 가공성을 향상시키기 위하여 0.035 중량% 이하로 제한한다.In addition, sulfur (S) is brittle when present in the steel is limited to 0.035% by weight or less in order to improve workability.

상기 티타늄(Ti)은 강 중에 존재시 탄소와 결합하여 탄화물을 만들어 봉재의 강도를 높이므로 0.01 ∼0.02 중량% 첨가시켰다.The titanium (Ti) is added to 0.01 ~ 0.02% by weight since the strength of the bar to increase the strength of the bar by bonding to carbon and carbon when present in the steel.

특히, 바나듐과 나요븀은 티타늄과 같이 강중의 탄소와 반응하여 복합탄화물을 석출시켜 강도를 향시키는데 지나친 석출에 의한 취성의 증대를 방지하기 위하여 각각 0.1 ∼0.2 중량%, 0.02∼0.05 중량%를 복합첨가시켰다.In particular, vanadium and niobium react with carbon in steel, such as titanium, to precipitate composite carbides to increase their strength. Added.

이와 같은 조성으로 이루어진 본 발명의 합금계 성분을 이용하여 고강도 고인성 강봉과 커넥팅로드를 제조하는 방법에 있어서, 먼저 상기 비조질강 조성물을 전로에서 용해시키고, 연속 주조한 후 강봉을 제조한 후에, 1200℃ 이상에서 열간단조하여 균질화 처리 및 성형을 실시한 후, 냉각속도 250∼300 ℃/분의 냉각 속도로 100∼250℃ 의 유콘 용액에 냉각 실시하여 레스형 마르텐사이트 기지조직과 바나듐, 니요븀, 티타늄의 복합탄화물이 기지조직내에 석출되도록 하였다.In the method for producing a high strength high toughness steel rod and connecting rod using the alloy-based component of the present invention having such a composition, first dissolving the non-coated steel composition in a converter, and after continuous casting, to produce a steel rod, 1200 Homogenization treatment and molding by hot forging above ° C, followed by cooling in a 100-250 ° C Yukon solution at a cooling rate of 250-300 ° C / min, and a les-type martensite matrix, vanadium, niobium, titanium The composite carbide of was precipitated in the matrix.

이때, 1200℃ 이상에서 재가열하는 것은 균일한 조직의 오스테나이트를 만들기 위해서이다.At this time, reheating at 1200 degreeC or more is for making austenite of a uniform structure.

이하, 본 발명을 실시예에 의하여 더욱 상세히 설명하고자 한다. 이들 실시예는 오로지 본 발명을 보다 구체적으로 설명하기 위한 것으로, 이들 실시예에 의하여 본 발명의 범위가 한정되는 것은 아니다.Hereinafter, the present invention will be described in more detail with reference to Examples. These examples are only for illustrating the present invention more specifically, and the scope of the present invention is not limited by these examples.

실시예 및 비교예Examples and Comparative Examples

본 발명의 비조질강 조성에 의거하여, 다음 표 1에 나타낸 바와 같은 조성 및 함량을 이용하여 통상의 방법으로 용강을 제조하고, 이를 전로에서 용해시키고 연속 주조한 및 압연을 실시한후 강봉을 제조하고, 이 소재를 1200℃ 이상으로 가열후, 열간 압연 및 수냉각 처리하여 상용차용 컨넥팅로드를 제조하였다.Based on the crude steel composition of the present invention, molten steel is prepared by a conventional method using the composition and content as shown in the following Table 1, dissolved in a converter, subjected to continuous casting and rolling, and then a steel bar is manufactured. After heating this material to 1200 degreeC or more, the hot rolling and water-cooling process manufactured the connecting rod for commercial vehicles.

표 1에 나타낸 실시예 1,2 및 비교예1,2에 따라 제조된 컨넥팅로드에 대하여 인장강도, 충격에너지, 피로시험을 평가하였으며, 그 결과를 다음 표 2에 나타내었다.Tensile strength, impact energy, and fatigue tests were evaluated for the connecting rods manufactured according to Examples 1 and 2 and Comparative Examples 1 and 2 shown in Table 1, and the results are shown in Table 2 below.

이때, 시험방법은 우선 제조된 강판으로 KS규격으로 인장 시험편을 만들고,25톤 즈빅 인장 시험기를 사용하여 20㎜/분의 속도로 인장시험하여 인장강도를 측정하였으며, 충격시험편은 V-노치 시험편을 사용하였고, 피로시험은 직경 8mm 의 회전굽힘 시험을 수행하였다.At this time, the test method was first made a tensile test piece to the KS standard from the manufactured steel plate, and the tensile strength was measured by a tensile test at a speed of 20 mm / min using a 25 ton Zvik tensile tester, the impact test piece was a V-notched test piece The fatigue test was carried out a rotary bending test of diameter 8mm.

위의 표 2에서 보는 바와 같이, 본 발명에 따라 제조된 고강도 고인성 대형차용 커넥팅 로드의 소재 및 부품은 종래의 소재-부품에 비해 인장강도, 인성, 피로강도 모두 약 10% 정도 향상되었음을 알 수 있었다.As shown in Table 2 above, the materials and components of the high-strength high toughness large-sized connecting rod manufactured according to the present invention can be seen that the tensile strength, toughness, fatigue strength of all about 10% compared to the conventional material-components. there was.

이상에서 본 바와 같이, 본 발명에 따른 비조질강 조성물 및 이를 이용한 커넥팅 로드 제조 방법에 의하면, 대형차용 고강도-고인성 컨넥팅로드는 부품이 요구하는 기본적인 특성인 강도, 인성, 내피로 특성이 기존에 비하여 모두 향상되어 저가의 소재와 공정 생략을 하고도 컨넥팅로드 고강도화를 달성할 수 있다.As described above, according to the non-coated steel composition and the connecting rod manufacturing method using the same according to the present invention, the high strength-toughness connecting rod for a large vehicle has conventional strength, toughness and fatigue resistance, which are required by components. Compared to the above, it is possible to achieve high strength of the connecting rod even if the low cost material and process are omitted.

또한, 최적 설계가 반영될 경우 약 10% 정도의 경량화 효과도 기대되어 차량의 내구성과 연비향상을 동시에 달성할 수 있다.In addition, when the optimal design is reflected, the weight reduction effect of about 10% is also expected, and thus the durability and fuel efficiency of the vehicle can be simultaneously achieved.

종래의 방법에서 열간단조후 열처리를 위하여 재가열 및 냉각 뜨임 공정으로 열처리하는 등의 후열처리 공정이 배제되어, 비용을 절감할 수 있다.In the conventional method, a post-heat treatment process such as heat treatment by a reheating and cooling tempering process for heat treatment after hot forging is excluded, thereby reducing costs.

Claims (3)

비조질강 조성물에 있어서,In a non-coated steel composition, 철(Fe)을 주성분으로 하고, 탄소(C) 0.10 내지 0.20 중량%, 규소(Si) 0.30 중량% 이하, 망간(Mn) 1.0 내지 2.5 중량%, 인(P) 0.015이하 중량%, 황(S) 0.035이하 중량%, 티타늄(Ti) 0.01 내지 0.03 중량%, 바나듐(V) 0.10 내지 0.20 중량%, 나요븀(Nb) 0.02내지 0.05 중량% 가 포함되어 이루어진 것을 특징으로 하는 비조질강 조성물을 제공한다.Main component of iron (Fe), carbon (C) 0.10 to 0.20% by weight, silicon (Si) 0.30% by weight or less, manganese (Mn) 1.0 to 2.5% by weight, phosphorus (P) 0.015% by weight, sulfur (S ) 0.035% by weight or less, 0.01 to 0.03% by weight of titanium (Ti), 0.10 to 0.20% by weight of vanadium (V), and 0.02 to 0.05% by weight of nabium (Nb). . 제 1 항에 있어서, 청구항 제1항의 조성물에 보론(B)이 10 내지 20 ppm 포함되는 것을 특징으로 하는 비조질강 조성물.The non-coated steel composition according to claim 1, wherein the composition of claim 1 contains 10 to 20 ppm of boron (B). 커넥팅 로드의 제조 방법에 있어서,In the manufacturing method of the connecting rod, 청구항 제1항의 합금계 조성물을 통상의 조업조건으로 전로에서 용해시키고, 연속 주조한 후, 컨넥팅 로드 제작시 1200℃ 이상에서 열간 단조작업후, 100 ∼ 250℃영역까지 제어 수냉각을 실시하여 상온에서 기지조직을 레스형 마르텐사이트화시키고, 바나듐 및 티타늄, 나요븀 복합 탄화물이 입내에 석출 경화되도록 한 것을 특징으로 하는 커넥팅 로드의 제조 방법.After dissolving the alloy composition of claim 1 in a converter under normal operating conditions and continuously casting, after hot forging at 1200 ° C. or higher during fabrication of a connecting rod, controlled water cooling is performed to a region of 100 to 250 ° C. at room temperature. The method for producing a connecting rod, characterized in that the matrix structure is made of the les-type martensite, and the vanadium, titanium, and niobium composite carbides are precipitated and hardened in the mouth.
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Cited By (8)

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Publication number Priority date Publication date Assignee Title
KR100656007B1 (en) * 2004-11-29 2006-12-08 현대자동차주식회사 Alloy composition for connecting rod casting and manufacturing method of connecting rod using the same
WO2015043060A1 (en) * 2013-09-26 2015-04-02 北大方正集团有限公司 Non-quenched and tempered steel and manufacturing method therefor
WO2015043059A1 (en) * 2013-09-26 2015-04-02 北大方正集团有限公司 Non-quenched and tempered steel and manufacturing method therefor
WO2015043061A1 (en) * 2013-09-26 2015-04-02 北大方正集团有限公司 Non-quenched and tempered steel and manufacturing method therefor
CN110894584A (en) * 2019-11-15 2020-03-20 江苏永钢集团有限公司 Non-quenched and tempered steel and manufacturing method thereof
CN112301266A (en) * 2019-07-25 2021-02-02 广东中坤钒钢科技有限公司 Non-quenched and tempered round steel for hot forging and production method thereof
WO2021047277A1 (en) * 2019-09-11 2021-03-18 南京钢铁股份有限公司 Method of preparing non-quenched and tempered steel and method of preparing fine-grain forged piece by using non-quenched and tempered steel
CN114959500A (en) * 2022-06-29 2022-08-30 马鞍山钢铁股份有限公司 Non-quenched and tempered steel for Nb-Ti composite reinforced medium-carbon fractured connecting rod, produced fractured connecting rod and forging and cooling control process

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100656007B1 (en) * 2004-11-29 2006-12-08 현대자동차주식회사 Alloy composition for connecting rod casting and manufacturing method of connecting rod using the same
WO2015043060A1 (en) * 2013-09-26 2015-04-02 北大方正集团有限公司 Non-quenched and tempered steel and manufacturing method therefor
WO2015043059A1 (en) * 2013-09-26 2015-04-02 北大方正集团有限公司 Non-quenched and tempered steel and manufacturing method therefor
WO2015043061A1 (en) * 2013-09-26 2015-04-02 北大方正集团有限公司 Non-quenched and tempered steel and manufacturing method therefor
CN112301266A (en) * 2019-07-25 2021-02-02 广东中坤钒钢科技有限公司 Non-quenched and tempered round steel for hot forging and production method thereof
WO2021047277A1 (en) * 2019-09-11 2021-03-18 南京钢铁股份有限公司 Method of preparing non-quenched and tempered steel and method of preparing fine-grain forged piece by using non-quenched and tempered steel
CN110894584A (en) * 2019-11-15 2020-03-20 江苏永钢集团有限公司 Non-quenched and tempered steel and manufacturing method thereof
CN114959500A (en) * 2022-06-29 2022-08-30 马鞍山钢铁股份有限公司 Non-quenched and tempered steel for Nb-Ti composite reinforced medium-carbon fractured connecting rod, produced fractured connecting rod and forging and cooling control process
CN114959500B (en) * 2022-06-29 2023-05-09 马鞍山钢铁股份有限公司 Non-quenched and tempered steel for Nb-Ti composite reinforced medium-carbon expansion-break connecting rod, expansion-break connecting rod produced by non-quenched and tempered steel, and forging and cooling control process

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