KR0147720B1 - Method for manufacturing mn-steel for conveyor chain - Google Patents

Method for manufacturing mn-steel for conveyor chain

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Publication number
KR0147720B1
KR0147720B1 KR1019950004338A KR19950004338A KR0147720B1 KR 0147720 B1 KR0147720 B1 KR 0147720B1 KR 1019950004338 A KR1019950004338 A KR 1019950004338A KR 19950004338 A KR19950004338 A KR 19950004338A KR 0147720 B1 KR0147720 B1 KR 0147720B1
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less
steel
strength
chain
rolling
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KR1019950004338A
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Korean (ko)
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KR960034449A (en
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소진왕
이홍주
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서순화
기아특수강주식회사
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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
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • 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
    • C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
    • 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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium

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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)
  • Heat Treatment Of Articles (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)

Abstract

본 발명은 강도를 향상시키고 특히 소재의 사용환경상 내마모성을 극히 우수하게 향상시켜 콘베이어 체인용으로 사용하는 고강도 표면 경화강 및 그 제조방법에 관한 것으로, 그 합금원소의 조성이 중량 %로 C : 0.15 ~ 0.30 %, Si : 0.15 ~ 0.40 %, Mn : 0.80 ~ 2.00 %, P : 0.020 % 이하, S : 0.020 % 이하, Cu : 0.25 % 이하, A1 : 0.015 ~ 0.060 %를 포함하고, 나머지는 Fe 및 제강공정에서 필연적으로 함유되는 불순물로 구성되어 있다.The present invention relates to a high-strength surface hardened steel and a method for producing the same for use in a conveyor chain by improving the strength and particularly improving the wear resistance of the environment of use of the material. 0.30%, Si: 0.15 to 0.40%, Mn: 0.80 to 2.00%, P: 0.020% or less, S: 0.020% or less, Cu: 0.25% or less, A1: 0.015 to 0.060%, the rest is Fe and steelmaking It consists of impurities which are inevitably contained in a process.

또한, 상기한 성분으로 구성된 합금원소가 함유되는 강재를 제조함에 있어서, 압연 가열온도를 1200±25℃로 하고 마무리 압연온도는 925±25℃로 하여 열간압연을 행하는 것을 특징으로 하며, 이러한 제조방법으로 제조한 강재에 대하여 모재부와 용접부의 제반 기계적 성질이 유사한 특성을 갖게하는 플래쉬 버트 용접법을 이용하여 체인을 제작하는 것을 특징으로 한다.In addition, in manufacturing a steel material containing the alloying element composed of the above components, the hot rolling is characterized by performing a hot rolling at a rolling heating temperature of 1200 ± 25 ℃ and a finish rolling temperature of 925 ± 25 ℃. It is characterized in that the chain is manufactured by using a flash butt welding method that has a similar mechanical properties of the base material and the welded part with respect to the steel produced.

아울러, 열처리 방법으로서, 전술한 제조방법으로 제조된 강재에 대하여 플래쉬 버트 용접법을 이용하여 체인을 제작한 후, 극히 우수한 내마모성의 부여를 목적으로 900 ~ 950℃에서 침탄열처리를 행하는 것을 특징으로 한다.In addition, as a heat treatment method, after producing a chain using a flash butt welding method for the steel produced by the above-described manufacturing method, it characterized in that the carburizing heat treatment at 900 ~ 950 ℃ for the purpose of providing extremely excellent wear resistance.

Description

콘베이어 체인용 Mn강 소재 및 그 제조방법Mn steel material for conveyor chain and manufacturing method

제1도는 본 발명에 따른 고강도 소재에 대하여 침탄열처리를 행한 후 침탄경화층 깊이를 측정한 결과를 보여주는 표면으로부터의 깊이에 따른 침탄 경도 그래프이다.1 is a carburized hardness graph according to the depth from the surface showing the result of measuring the carburized hardened layer depth after carburizing heat treatment for the high-strength material according to the present invention.

본 발명은 고강도 표면경화강 및 그 제조방법에 관한 것으로서, 강도를 향상시키고 특히 소재의 사용환경상 내마모성을 극히 우수하게 향상시켜 콘베이어 링크 체인용 원형강으로 사용하는 Mn강 소재, 그 제조방법, 상기 방법으로 제조한 소재에 대하여 플래쉬 버트 용접법을 이용하여 체인을 제작하는 방법 및 상기 방법으로 제작한 체인을 열처리하는 방법에 관한 것이다.The present invention relates to a high-strength surface hardened steel and a manufacturing method thereof, Mn steel material used as a circular steel for a conveyor link chain by improving the strength and particularly excellent wear resistance in the environment of use of the material, a method of manufacturing the same, the method It relates to a method for producing a chain using a flash butt welding method for the material produced by the method and a method for heat treatment of the chain produced by the above method.

본 발명의 목적은 일반적으로 사용되는 산업용 체인 소재에 비해 강도를 향상시키고 특히 내마모성을 극히 우수하게 향상시켜 그 수명에 있어서 월등히 우수한 특성을 갖는 고강도 소재를 제공하는데 있으며, 또한 모재부와 용접부의 제반 기계적 성질이 유사한 특성을 갖게하는 플래쉬 버트 용접법을 이용하여 용접부의 특성을 향상시키는데 있다.An object of the present invention is to provide a high-strength material having a superior characteristic in terms of its lifespan by improving strength and particularly excellent wear resistance compared to industrial chain materials which are generally used. It is to improve the characteristics of the weld by using a flash butt welding method having similar properties.

또한, 본 발명에 의한 고강도 소재는 최적의 침탄열처리에 의한 내마모성 및 고른 침탄성의 부여, 용접부와 모재부의 고른 소입성, 양호한 요접성을 부여하는 미세원소 첨가효과, 미세한 결정입도 형성원소의 첨가로 안정한 질화물을 생성하여 변형시효를 방지함은 물론 고온에 결정립 조대화를 방지하는 효과가 있으며, 종래의 고급강 소재 개발에 문제가 되어온 정밀 합금설계를 행한 것이 특징이다.In addition, the high-strength material according to the present invention is stable by providing the wear resistance and even carburizing property by the optimum carburizing heat treatment, the evenly hardenability of the welded part and the base material part, the effect of adding microelements, and the fine grain size forming element. It has the effect of preventing the strain aging by forming nitride as well as preventing grain coarsening at high temperature, and is characterized by precision alloy design that has been a problem in the development of conventional high-grade steel materials.

상기의 목적을 만족시키기 위한 콘베이어 체인용 소재로서 본 발명의 인장강도 60Kg/㎜2급 소재는 중량 % 로, C : 0.15 ~ 0.30 %, Si : 0.15 ~ 0.40 %, Mn : 0.80 ~ 2.00 %, P : 0.020 % 이하, S : 0.020 % 이하, Cu : 0.25 %이하, A1 : 0.015 ~ 0.060 %를 포함하고, 나머지는 Fe 및 제강공정에서 필연적으로 함유되는 불순물로 구성된다.Tensile strength 60Kg / ㎜ 2 class material of the present invention is used as material for the conveyor chain to satisfy the above-mentioned object is, by weight%, C: 0.15 ~ 0.30% , Si: 0.15 ~ 0.40%, Mn: 0.80 ~ 2.00%, P : 0.020% or less, S: 0.020% or less, Cu: 0.25% or less, A1: 0.015 to 0.060%, and the rest is composed of Fe and impurities inevitably contained in the steelmaking process.

본 발명의 고강도 소재에 있어서 첨가성분의 한정이유를 설명하면 다음과 같다.The reason for limitation of additive components in the high strength material of the present invention is as follows.

C(탄소)은 소입경도를 높이고 탄화물을 생성시켜 강도를 증대시키나, 본 강종의 경우 0.15 % 이하에서는 소요의 강도를 얻을 수 없고 0.30 % 이상에서는 탄소당량(Ceq.)을 증가시켜 용접성을 해치며 연성 및 인성을 저하시키므로 첨가성분 범위를 제한할 필요가 있다.C (carbon) increases the hardness of hardening and increases the strength by generating carbides.However, in case of this steel grade, the required strength cannot be obtained under 0.15%, and the carbon equivalent (Ceq.) Is increased above 0.30% to damage the weldability. It is necessary to limit the range of additive ingredients because it lowers the ductility and toughness.

Si(규소)은 탈산제로서 가장 유효하며 저온 소려시 충격저항을 증대시키고 저온 소려 저항성을 크게하는 성분이나, 0.15 % 이하에서는 강의 탈산이 불충분하게 되므로 탈산과 강도증가를 위해 필요하며 0.40 % 이상에서는 인성을 저해하므로 0.40 % 이하로 할 필요가 있다.Si (silicone) is the most effective as deoxidizer and it increases the shock resistance at low temperature and increases the resistance to low temperature.However, it is necessary for deoxidation and strength increase at 0.15% or less. It is necessary to make it 0.40% or less because it inhibits.

Mn(망간)은 소입성을 증대시켜 내마모성을 높이고 강도를 높이며 탈산제로서 유효한 성분이나, 본 강종의 경우 0.80 % 이하에서는 소요의 강도를 얻는 것이 곤란하고 너무 많게되면 탄소당량을 증가시켜 용접성을 해치며 소입 크랙을 일으키기도 하므로 첨가 성분 범위를 2.00 % 이내로 제한할 필요가 있다.Mn (manganese) is an ingredient that increases hardenability, improves abrasion resistance, increases strength, and is effective as a deoxidizer.However, in the case of this steel grade, it is difficult to obtain required strength at 0.80% or less. Since hardening cracks may occur, the range of added ingredients needs to be limited to within 2.00%.

P(인)는 열간 압연시 띠상조직(Banded Srtucture)을 형성시켜 조직의 균일성을 해치고 편석을 일으키기 쉬우며 충격저항을 저하시켜 소려 취성을 촉진하고 양호한 인성을 얻기 곤란하므로 0.020 % 이하로 제한할 필요가 있다.P (phosphorus) forms banded structure during hot rolling, which impairs uniformity of the structure and causes segregation, and decreases the impact resistance to promote brittleness and difficult to obtain good toughness. There is a need.

S(황)는 저융점의 유화물을 형성, 압연시 압연방향으로 점성변형되어 인성 및 충격치를 저하시키며 Fe 와의 화합물은 열간가공성을 나쁘게 하므로 상한선을 0.020 % 로 제한하였다.S (sulfur) is a low melting point of the emulsion, the viscosity in the rolling direction when rolling to reduce the toughness and impact value, and the compound with Fe deteriorate the hot workability, limiting the upper limit to 0.020%.

Cu(동)는 인성향상에 유효하지만 적열취성의 위험이 있고 용접성을 해치며 0.25 % 이상에서는 성형가공성을 저해하므로 양호하지 않다. 따라서 상한선을 0.25 %이하로 제한할 필요가 있다.Cu (copper) is effective in improving toughness, but it is not good because there is a risk of red brittleness, impairs weldability and inhibits moldability at 0.25% or more. Therefore, it is necessary to limit the upper limit to 0.25% or less.

A1(알루미늄)은 강 탈산제로서 유효하고 질화물(AIN) 형성원소로서 오스테나이트이 성장을 억제하며 결정립을 미세화한다. 또한 인성의 향상을 위해 최저 0.015 % 는 필요하지만 과량 첨가시는 천이온도를 상승시키며 산화물의 부상이 곤란하게 되어 강의 청정도를 저하시키므로 0.060 % 이하로 제한할 필요가 있다.A1 (aluminum) is effective as a strong deoxidizer and austenite as a nitride (AIN) forming element inhibits growth and refines grains. In addition, at least 0.015% is required to improve the toughness, but when it is added excessively, the transition temperature is increased, and the rise of oxide becomes difficult, which reduces the cleanliness of the steel.

본 발명은 개재물 제어기술과 고청정도강 제어기술의 응용으로 피로강도에 영향을 주는 불순물 등을 최대한 억제하여 상술한 조성을 갖는 강재를 제작하고, 1200±25℃의 온도로 가열, 중형 및 소형 열간압연을 행하여 소정의 크기로 압연한 후, 반드시 서냉시키는 것을 특징으로 하는 제조 방법으로 이루어진다.The present invention, by the application of the inclusion control technology and high cleanliness steel control technology to produce the steel having the above-mentioned composition by suppressing impurities and the like affecting the fatigue strength as much as possible, heating to a temperature of 1200 ± 25 ℃, medium and small hot rolling After rolling to a predetermined size by carrying out, it always consists of a manufacturing method characterized by slow cooling.

열간가공을 위한 가열온도는 소재의 열간강도, 생산량 등 여러 조건을 고려하여 채택되나, 가열온도의 과도한 상승은 탄질화물의 오스테나이트 결정립 성장 억제기능이 감소되어 결국 가공완료시 조대한 펄라이트를 형성하게 되므로, 본 발명에서는 압연 가열온도를 1200 ± 25℃로 하고 마무리 압연온도는 925 ± 25℃로 하는 조업 온도범위를 선택하여 열간압연을 행하였다.The heating temperature for hot processing is adopted in consideration of various conditions such as the material's hot strength and production volume, but excessive increase in the heating temperature reduces the growth inhibition of austenitic grain growth of carbonitrides and eventually forms coarse pearlite upon completion of processing. Therefore, in the present invention, the hot rolling was performed by selecting an operating temperature range in which the rolling heating temperature was 1200 ± 25 ° C and the finish rolling temperature was 925 ± 25 ° C.

또한, 본 발명은 본 발명과 같은 고강도 소재에 요구되는 인장강도, 신율, 단면수축율, 충격값 및 내마모성 등의 제반 기계적 성질을 만족시키기 위하여 침탄열처리를 행하는데, 심부까지 충분히 경화시켜줄 수 있는 온도인 900 ~ 950℃의 온도에서 침탄열처리를 행하여 강도 및 내마모성이 향상된 소재를 얻는 열처리 방법을 특징으로 한다.In addition, the present invention is subjected to carburizing heat treatment to satisfy all mechanical properties such as tensile strength, elongation, cross-sectional shrinkage, impact value and wear resistance required for high-strength materials such as the present invention, the temperature that can be sufficiently hardened to the core It is characterized by a heat treatment method of carburizing heat treatment at a temperature of 900 ~ 950 ℃ to obtain a material with improved strength and wear resistance.

이하 본 발명을 실시예에 의하영 상세히 설명하면 다음과 같다.Hereinafter, the present invention will be described in detail with reference to Examples.

[실시예]EXAMPLE

상술한 본 발명의 콘베이어 체인용 고강도 소재에 대하여 상술한 방법에 의하여 표 1 과 같은 성분의 강재를 얻었다.The steel materials of the component of Table 1 were obtained by the method mentioned above about the high strength material for conveyor chains of this invention mentioned above.

상기 본 발명의 강재는 압연 가열온도 1200℃로 가열하고 마무리 가열온도를 930℃로 하여 열간압연을 행하여 ψ26 봉강으로 제조하였고, 이렇게 만들어진 강재에 대하여 내마모성 및 강도의 부여를 위하여 920℃에서 450분간 침탄열처리를 행하였다. 이렇게 열처리를 실시한 경우의 항복강도, 인장강도, 연신율, 단면수축율, 모재부 및 요접부의 충격 흡수에너지는 표 2 에 나타낸 바와 같이 양호하였다.The steel of the present invention was heated to a rolling heating temperature of 1200 ℃ and hot-rolled at a finish heating temperature of 930 ℃ was manufactured as ψ26 bar steel, carburized for 450 minutes at 920 ℃ for granting wear resistance and strength Heat treatment was performed. The yield strength, tensile strength, elongation, cross-sectional shrinkage, impact absorption energy of the base material portion and the concave contact portion in the heat treatment were good as shown in Table 2.

또한, 본 발명에 의한 인장강도 60Kg/㎜ 급 고강도 소재에 대하여 침탄열처리를 실시한 후, 침탄 경화층 깊이를 측정한 결과 제1도에 나타낸 바와 같이 체인 굵기의 약 10 %에 상당하는 양호한 침탄층을 얻었다.In addition, the tensile strength of the present invention 60Kg / mm After carburizing heat treatment was performed on the grade high strength material, the carburized layer depth was measured, and as shown in FIG. 1, a good carburized layer corresponding to about 10% of the thickness of the chain was obtained.

Claims (2)

중량 %로 C : 0.15 ~ 0.30 %, Si : 0.15 ~ 0.40 %, Mn : 0.80 ~ 2.00 %, P : 0.020 % 이하, S : 0.020 % 이하, Cu : 0.25 %이하, A1 : 0.015 ~ 0.060 %, Ceq.: 0.65 % 이하를 포함하고, 나머지는 Fe 및 제강 공정에서 필연적으로 함유되는 불순물로 조성되는 것을 특징으로 하는 인장강도 60Kg/㎜2급 이상인 콘베이어 체인용 Mn강 소재.By weight% C: 0.15 to 0.30%, Si: 0.15 to 0.40%, Mn: 0.80 to 2.00%, P: 0.020% or less, S: 0.020% or less, Cu: 0.25% or less, A1: 0.015 to 0.060%, Ceq .: Mn steel material for conveyor chains having a tensile strength of 60 Kg / mm 2 or more, comprising 0.65% or less, and the remainder being composed of Fe and impurities inevitably contained in the steelmaking process. 중량 %로 C : 0.15 ~ 0.30 %, Si : 0.15 ~ 0.40 %, Mn : 0.80 ~ 2.00 %, P : 0.020 % 이하, S : 0.020 % 이하, Cu : 0.25 % 이하, A1 : 0.015 ~ 0.060 %, Ceq.: 0.65 % 이하 포함하고, 나머지는 Fe 및 제강 공정에서 필연적으로 함유되는 불순물로 조성되는 것을 특징으로 하는 강재를 제조한 다음, 압연 가열온도를 1200±25℃로 하고 마무리 압연온도는 925±25℃로 하여 열간압연을 행하는 것을 특징으로 하는 인장강도 60Kg/㎜2급 이상인 콘베이어 체인용 Mn강 소재의 제조방법.By weight% C: 0.15 to 0.30%, Si: 0.15 to 0.40%, Mn: 0.80 to 2.00%, P: 0.020% or less, S: 0.020% or less, Cu: 0.25% or less, A1: 0.015 to 0.060%, Ceq .: 0.65% or less, the remainder is made of Fe and impurity inevitably contained in the steelmaking process to produce a steel material, the rolling heating temperature is 1200 ± 25 ℃ and the finish rolling temperature is 925 ± 25 A method of producing a Mn steel material for a conveyor chain having a tensile strength of 60 Kg / mm 2 or more, characterized in that hot rolling is carried out at a temperature of 0C.
KR1019950004338A 1995-03-03 1995-03-03 Method for manufacturing mn-steel for conveyor chain KR0147720B1 (en)

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