KR20010066189A - Highly carbon carburizing steel - Google Patents
Highly carbon carburizing steel Download PDFInfo
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- KR20010066189A KR20010066189A KR1019990067777A KR19990067777A KR20010066189A KR 20010066189 A KR20010066189 A KR 20010066189A KR 1019990067777 A KR1019990067777 A KR 1019990067777A KR 19990067777 A KR19990067777 A KR 19990067777A KR 20010066189 A KR20010066189 A KR 20010066189A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 57
- 239000010959 steel Substances 0.000 title claims abstract description 57
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 53
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims description 50
- 238000005255 carburizing Methods 0.000 title abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000010955 niobium Substances 0.000 claims abstract description 10
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 9
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052742 iron Inorganic materials 0.000 claims abstract description 6
- 229910052710 silicon Inorganic materials 0.000 claims description 13
- 239000010703 silicon Substances 0.000 claims description 13
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 7
- 229910052717 sulfur Inorganic materials 0.000 claims description 7
- 239000011593 sulfur Substances 0.000 claims description 7
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 6
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 6
- 229910052804 chromium Inorganic materials 0.000 claims description 6
- 239000011651 chromium Substances 0.000 claims description 6
- 229910052750 molybdenum Inorganic materials 0.000 claims description 6
- 239000011733 molybdenum Substances 0.000 claims description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims description 6
- 239000011574 phosphorus Substances 0.000 claims description 6
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims description 4
- 238000005299 abrasion Methods 0.000 abstract description 9
- 238000005452 bending Methods 0.000 abstract description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 2
- 230000008021 deposition Effects 0.000 abstract 1
- 239000002075 main ingredient Substances 0.000 abstract 1
- 230000003647 oxidation Effects 0.000 abstract 1
- 238000007254 oxidation reaction Methods 0.000 abstract 1
- 239000000377 silicon dioxide Substances 0.000 abstract 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 9
- 239000000203 mixture Substances 0.000 description 5
- 230000000704 physical effect Effects 0.000 description 5
- 238000010791 quenching Methods 0.000 description 5
- 230000000171 quenching effect Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 238000005204 segregation Methods 0.000 description 4
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 239000011572 manganese Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000013021 overheating Methods 0.000 description 3
- 238000005496 tempering Methods 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 150000001247 metal acetylides Chemical class 0.000 description 2
- 239000004005 microsphere Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
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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
- 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
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
-
- 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)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
Description
본 발명은 고탄소 침탄강에 관한 것으로서, 더욱 상세하게는 침탄강 조성에 니오븀 0.015 ∼ 0.035 중량% 및 규소 0.60 ∼ 0.80 중량%가 포함되도록 고탄소 침탄강을 제조함으로써, 결정립의 미세화로 인한 내피팅성, 내마모성 및 마찰 특성이 증가되고, 탄화물의 입계 석출 저지 및 입계 산화층이 저감되는 고탄소 침탄강에 관한 것이다.The present invention relates to a high carbon carburized steel, and more particularly, by producing a high carbon carburized steel such that niobium 0.015 to 0.035% by weight and silicon 0.60 to 0.80% by weight are included in the carburized steel composition, thereby preventing fitting The present invention relates to a high carbon carburized steel having increased resistance to wear, abrasion, and friction, and reducing carbide grain boundary precipitation and grain boundary oxide layers.
일반적으로 공작 기계나 기관에 사용되는 탄소강 또는 합금강의 기어나 캠(CAM)은 내마멸성과 내충격성이 동시에 요구된다. 통상적인 담금질 처리를하면 내마멸성은 부여되나 내충격성이 없어지게 된다. 또한, 템퍼링에 의하여 인성을 증가시켜 내충격성을 향상시켜도 내마멸성이 저하하게 된다.In general, gears or cams of carbon steel or alloy steel used in machine tools or engines require both abrasion resistance and impact resistance. Normal quenching treatment gives abrasion resistance but no impact resistance. In addition, even if the toughness is increased by the tempering to improve the impact resistance, abrasion resistance is lowered.
따라서, 이러한 결점을 해결하기 위하여 인성이 있는 재료의 표면만을 경화하여 그 내부 모재의 인성이 생기도록 표면 경화(surface hardening) 처리를 한다. 이러한 표면 경화 방법에는 여러 가지 방법이 있는데, 그 중 침탄법이 주로 사용된다. 상기의 침탄법으로 제조된 침탄강은 강의 내부는 저탄소 상태이고, 강의 외부는 고탄소의 상태로서, 표면은 굳고 내부는 원래의 성질을 나타내어 내마멸성과 내충격성을 동시에 만족시킬 수 있다.Therefore, in order to solve this drawback, only the surface of the tough material is cured and the surface hardening treatment is performed so that the toughness of the internal base material is generated. There are various methods for such a surface hardening method, of which carburization is mainly used. The carburized steel produced by the carburizing method has a low carbon state inside the steel, a high carbon state outside the steel, the surface is solid, and the inside shows the original property, thereby satisfying abrasion resistance and impact resistance at the same time.
종래의 고탄소 침탄강으로는 다이도(DAIDO) 제강의 RK706및 엠엠씨(MMC) 제강의 MAC14의 두 강종이 개발되어 있다. 상기 RK706의 조성은 철을 주성분으로 하고, 탄소 0.15 중량%, 규소 0.50 중량%, 망간 0.30 중량%, 인 0.015 중량%, 황 0.015 중량%, 크롬 2.25 중량%, 몰리브덴 0.40 중량%가 함유되어 있고, 상기 MAC14의 조성은 철을 주성분으로 하고, 탄소 0.10 ∼ 0.18 중량%, 규소 0.20 ∼ 0.35 중량%, 망간 0.40 ∼ 0.70 중량%, 인 0.030 중량% 미만, 황 0.030 중량% 미만, 크롬 2.4 ∼ 2.8 중량%, 몰리브덴 0.35 ∼ 0.55 중량%가 함유되어 있다.Conventional high carbon carburized steels have been developed, two types of steel, RK706 of DAIDO steel and MAC14 of MMC steel. The composition of RK706 is based on iron, 0.15% by weight of carbon, 0.50% by weight of silicon, 0.30% by weight of manganese, 0.015% by weight of phosphorus, 0.015% by weight of sulfur, 2.25% by weight of chromium, 0.40% by weight of molybdenum, The composition of MAC14 is based on iron, 0.10 to 0.18 wt% carbon, 0.20 to 0.35 wt% silicon, 0.40 to 0.70 wt% manganese, less than 0.030 wt% phosphorus, less than 0.030 wt% sulfur, 2.4 to 2.8 wt% chromium. And 0.35 to 0.55% by weight of molybdenum.
그러나, 상기와 같은 기존의 고탄소 침탄강으로는 침탄시 탄화물의 입계 석출 저지에 한계가 있고, 트랜스미션의 기어부분 및 샤프트등의 가공 공정이 없는 경우에 있어서 입계 산화층이 각 부분의 물성에 크게 영향을 주기 때문에 이를 저감시키는 것이 필수적이다.However, the existing high carbon carburized steel has a limitation in preventing the precipitation of grain boundaries during carburization, and the grain boundary oxide layer greatly influences the physical properties of each part in the absence of machining processes such as the gear part and the shaft of the transmission. It is necessary to reduce this because
따라서, 본 발명에서는 결정립 미세화원소인 니오븀의 첨가와 규소가 포함되어 있는 고탄소 침탄강을 개발함으로써 내피팅성, 내마모성 및 마찰 특성을 증가시키고, 결정 입계에 편석 입계 탄화물 석출을 저지하며, 입계 산화층을 저감시킨 고탄소 침탄강을 제공하는데 그 목적이 있다.Therefore, in the present invention, by adding niobium, a grain refinement element, and developing a high carbon carburized steel containing silicon, the pitting resistance, abrasion resistance, and friction characteristics are increased, and segregation grain boundary carbides are prevented at grain boundaries, and grain boundary oxide layers Its purpose is to provide a high carbon carburized steel with reduced pressure.
도 1a는 기존의 고탄소 침탄강의 결정을 나타낸 것이고,Figure 1a shows a crystal of a conventional high carbon carburized steel,
도 1b는 본 발명에 따른 고탄소 침탄강의 결정을 나타낸 것이고,Figure 1b shows a crystal of high carbon carburized steel according to the present invention,
도 2a는 기존의 고탄소 침탄강의 표면조직을 나타낸 것이고,Figure 2a shows the surface structure of a conventional high carbon carburized steel,
도 2b는 본 발명에 따른 고탄소 침탄강의 표면조직을 나타낸 것이다.Figure 2b shows the surface structure of the high carbon carburized steel according to the present invention.
본 발명은 고탄소 침탄강에 있어서, 철을 주성분으로 하고, 탄소 0.17 ∼ 0.21 중량%, 규소 0.60 ∼ 0.80 중량%, 망간 0.50 ∼ 0.70 중량%, 인 0.015 중량% 미만, 황 0.015 중량% 미만, 크롬 2.2 ∼ 2.4 중량%, 몰리브덴 0.35 ∼ 0.55 중량% 및 니오븀 0.015 ∼ 0.035 중량%가 함유되어 있는 고탄소 침탄강을 그 특징으로 하고 있다.In the high carbon carburized steel, iron is mainly composed of 0.17 to 0.21 wt% of carbon, 0.60 to 0.80 wt% of silicon, 0.50 to 0.70 wt% of manganese, less than 0.015 wt% of phosphorus, less than 0.015 wt% of sulfur, and chromium. It features a high carbon carburized steel containing 2.2 to 2.4 wt%, molybdenum 0.35 to 0.55 wt%, and niobium 0.015 to 0.035 wt%.
이와 같은 본 발명을 더욱 상세하게 설명하면 다음과 같다.The present invention will be described in more detail as follows.
본 발명은 종래의 고탄소 침탄강에 니오븀 및 규소를 함유시켜 제조함으로써 내피팅성, 내마모성 및 마찰 특성이 증가되고, 결정 입계에 편석 입계 탄화물 석출이 저지되어, 입계 산화층을 저감시킨 고탄소 침탄강을 그 특징으로 하고 있다.The present invention is manufactured by containing niobium and silicon in a conventional high carbon carburized steel to increase the fitting resistance, abrasion resistance, and friction characteristics, to prevent segregation grain boundary carbide precipitation at the grain boundary, and to reduce the grain boundary oxide layer. It is characterized by.
먼저, 본 발명에 있어서, 고탄소 침탄강의 제조시 탄소의 함량에 따라 침탄강의 기계적 성질이 현저하게 변하게 된다. 본 발명에서 사용되는 탄소의 함량은 전체 고탄소 침탄강에 대하여 0.17 ∼ 0.21 중량% 첨가된다.First, in the present invention, the mechanical properties of the carburized steel are remarkably changed depending on the carbon content in the production of the high carbon carburized steel. The content of carbon used in the present invention is 0.17 to 0.21% by weight based on the total high carbon carburized steel.
특히, 본 발명에서 사용하는 규소는 고탄소 침탄강의 제조시 결정 입계에 편석 입계 탄화물의 석출을 저지하고, 입계 산화층을 동시에 저감시키는 역할은 하게된다. 또한, 규소는 강괴 중에서 편석을 만드는 경향이 있으며, SiO2로 되어 강속에 존재하여 입계 산화층을 형성하게 된다. 이러한 특성을 갖는 규소는 입계 산화층 생성에 직접적인 역할을 하지만 전체 고탄소 침탄강에 대하여 함량이 0.40 중량%까지는 입계 산화층이 증가하나, 그 이상에서는 오히려 감소하게 되어 0.60중량% 이상 첨가되면 입계 산화층을 5㎛ 이내로 줄이는 것이 가능해진다. 따라서, 본 발명에서는 상기 규소의 함량을 전체 고탄소 침탄강에 대하여 0.60 ∼ 0.80 중량%로 첨가시킨다. 이때, 만일 규소의 함량이 상기 범위보다 많거나 적은 경우 입계 산화층이 증가하며 기포가 많아지게 되어 바람직하지 못하게 된다.In particular, the silicon used in the present invention prevents precipitation of segregated grain boundary carbide at the crystal grain boundary during the production of high carbon carburized steel and simultaneously serves to reduce the grain boundary oxide layer. In addition, silicon tends to form segregation in the steel ingot, and becomes SiO 2 to exist in the steel to form a grain boundary oxide layer. Silicon with these characteristics plays a direct role in the formation of the intergranular oxide layer, but the intergranular oxide layer increases up to 0.40% by weight with respect to the total high carbon carburized steel, but it decreases more than 0.60% by weight. It becomes possible to reduce it to within micrometers. Therefore, in the present invention, the silicon content is added at 0.60 to 0.80% by weight based on the total high carbon carburized steel. At this time, if the silicon content is more or less than the above range, the grain boundary oxide layer is increased and bubbles are increased, which is undesirable.
본 발명에서 사용하는 망간은 고탄소 침탄강의 제조시 황을 MnS로 제거하기 위하여 첨가되고, 담금질 시 과열을 억제하고 침투성을 향상시키는 역할을 한다. 본 발명에서 망간의 함량은 전체 고탄소 침탄강에 대하여 0.50 ∼ 0.70 중량% 첨가된다.Manganese used in the present invention is added to remove sulfur with MnS in the manufacture of high carbon carburized steel, and serves to suppress overheating and improve permeability during quenching. In the present invention, the content of manganese is added 0.50 to 0.70% by weight based on the total high carbon carburized steel.
본 발명에서 사용하는 인은 고탄소 침탄강의 제조시 광석으로부터 잔류하는 원소로서, Fe3P로 되어 편석을 만드는 경향이 크고 충격 저항을 감소시키며 상온에서 강을 취약하게 만들게 되므로 그 함량이 적을수록 좋다. 따라서, 본 발명에서 인의 함량은 전체 고탄소 침탄강에 대하여 0.015 중량% 미만으로 억제시키며, 만일 망간의 함량이 0.015 중량% 초과되면 고탄소 침탄강의 표면 및 물성이 저하되어 바람직하지 못하다.Phosphorus used in the present invention is an element remaining from the ore during the manufacture of high carbon carburized steel, Fe 3 P has a high tendency to form segregation, decreases the impact resistance and makes the steel vulnerable at room temperature, the smaller the content is better . Therefore, the content of phosphorus in the present invention is suppressed to less than 0.015% by weight relative to the total high carbon carburized steel, and if the content of manganese exceeds 0.015% by weight, the surface and physical properties of the high carbon carburized steel is lowered, which is undesirable.
본 발명에서 사용하는 황은 고탄소 침탄강의 제조시 연료 코우크스 및 그 밖의 원소로부터 잔류하는 원소로서, FeS로 되어 철의 경정 입계에 망상으로 들어가 물성 및 표면성을 저하시키는 등 유해무익하므로 그 함량이 적을수록 좋다. 따라서, 본 발명에서 황의 함량은 전체 고탄소 침탄강에 대하여 0.015 중량% 미만으로 억제시키며, 그 사용 함량이 0.015 중량%가 초과되면 고탄소 침탄강의 표면 및 물성이 저하되어 바람직하지 못하다.Sulfur used in the present invention is an element that remains from fuel coke and other elements in the manufacture of high carbon carburized steel, and is made of FeS, which is harmful to the ferritic grain boundary of iron and deteriorates physical properties and surface properties. Less is better. Therefore, the content of sulfur in the present invention is suppressed to less than 0.015% by weight relative to the total high carbon carburized steel, when the content is more than 0.015% by weight is not preferable because the surface and physical properties of the high carbon carburized steel is lowered.
본 발명에서 사용하는 크롬은 고탄소 침탄강의 제조시 내마멸성 및 내식성을 증가시키기 위하여 첨가되고, 담금질 시 과열을 억제하고 탄화물 생성을 향상시키는 역할을 한다. 본 발명에서 크롬의 함량은 전체 고탄소 침탄강에 대하여 2.2 ∼ 2.4 중량% 첨가된다.Chromium used in the present invention is added to increase the abrasion resistance and corrosion resistance in the production of high carbon carburized steel, serves to suppress overheating and improve carbide production during quenching. In the present invention, the content of chromium is added in an amount of 2.2 to 2.4 wt% based on the total high carbon carburized steel.
본 발명에서 사용하는 몰리브덴은 고탄소 침탄강의 제조시 템퍼링 취성을 방지하고, 고온강도 및 인장강도를 증가시키기 위하여 첨가되고, 담금질 시 과열을 억제하고 침투성을 향상시키는 역할을 한다. 본 발명에서 몰리브덴의 함량은 전체 고탄소 침탄강에 대하여 0.35 ∼ 0.55 중량% 첨가된다.Molybdenum used in the present invention is added to prevent tempering embrittlement during the production of high carbon carburized steel, and to increase the high temperature strength and tensile strength, and serves to suppress overheating and improve permeability during quenching. In the present invention, the content of molybdenum is added 0.35 to 0.55% by weight based on the total high carbon carburized steel.
특히, 본 발명에서 사용하는 니오븀은 결정립 미세화 원소로서 고탄소 침탄강의 제조시 미세한 구상 탄화물을 안정적으로 결정입내에 석출시키기 위하여 첨가된다. 상기 니오븀의 첨가에 의한 결정립 미세화로 탄화물 형상을 구상으로 제어가 가능하여, 내피팅성 및 굽힘 피로특성이 향상된다. 본 발명에서 니오븀의 함량은 전체 고탄소 침탄강에 대하여 0.015 ∼ 0.035 중량% 첨가된다.In particular, niobium used in the present invention is added as a grain refinement element in order to stably deposit fine spherical carbides in the grain during the production of high carbon carburized steel. Carbide shape can be spherically controlled by the refinement of grains by the addition of niobium, thereby improving the fitting resistance and the bending fatigue characteristic. In the present invention, the niobium content is added in an amount of 0.015 to 0.035 wt% based on the total high carbon carburized steel.
상기 조성과 함량을 지닌 탄소강을 표면에 탄소를 침투시켜 표면으로부터 차례로 담금질 및 템퍼링 공정을 거쳐 표면 경도, 내피팅성 및 굽힘피로 특성이 향상된 고탄소 침탄강을 얻을 수 있다.The carbon steel having the composition and content penetrates carbon on the surface, and thus, high carbon carburized steel having improved surface hardness, fitting resistance, and bending fatigue property may be obtained by sequentially quenching and tempering from the surface.
이와 같은 본 발명을 실시예에 의거 상세히 설명하겠는 바, 본 발명이 실시예에 의해 한정되는 것은 아니다.Although this invention is demonstrated in detail based on an Example, this invention is not limited by an Example.
실시예 및 비교예Examples and Comparative Examples
다음 표 1에 나타낸 바와 같은 함량과 조성으로 통상적인 방법에 따라 고탄소 침탄강을 제조하였고, 비교예로는 기존의 엠엠씨(MMC) 제강의 MAC14 합금강을 사용하였다.Next, a high carbon carburized steel was manufactured according to a conventional method with a content and composition as shown in Table 1, and as a comparative example, a conventional MAC14 alloy steel of MMC steel was used.
그리고, 상기 실시예 및 비교예에서 제조한 고탄소 침탄강으로 물성 측정을 위한 시험편을 제작하여 표면 경도, 입계 산화층의 두께 및 굽힘 피로 특성을 통상적인 방법에 의거하여 측정하고, 그 결과를 표 1에 나타내었다.In addition, the test piece for measuring the physical properties of the high carbon carburized steel prepared in Examples and Comparative Examples was prepared, and the surface hardness, the thickness of the grain boundary oxide layer, and the bending fatigue characteristics were measured according to a conventional method, and the results are shown in Table 1 below. Shown in
상기 표 1의 결과에서 보면, 비교예의 굽힘 피로한이 82 kgf/㎟, 실시예의경우 95 kgf/㎟로 비교예에 비해 15% 우수한 결과를 나타내었다. 또한, S-N 커브상에서 고응력 저싸이클 파손형태를 고응력 고싸이클로 전환되는 특징을 나타내어 트랜스미션의 기어부분 및 샤프트 재질로서 사용이 가능함을 알 수 있다.In the results of Table 1, the bending fatigue of the comparative example was 82 kgf / mm 2, in the case of 95 kgf / mm 2 was 15% better than the comparative example. In addition, the high-stress low-cycle breakdown form on the S-N curve shows a feature that converts into a high-stress high-cycle, it can be seen that it can be used as the gear portion and shaft material of the transmission.
그리고, 상기 실시예 및 비교예의 고탄소 침탄강을 주사 전자 현미경(SEM,×500)을 통해 각각의 결정 및 표면 조직 사진을 첨부도면 도 1a, 도 1b, 도 2a, 및 도 2b에 나타내었다.And the high-carbon carburized steel of the said Example and the comparative example was shown in FIG. 1A, FIG. 1B, FIG. 2A, and FIG. 2B by the scanning electron microscope (SEM, * 500), respectively.
도 1a 및 도 2b에서는 비교예 및 실시예의 고탄소 열처리 방법으로 열처리한 시험편의 결정립 크기를 나타내었다. 비교예의 경우 고탄소 침탄강의 결정립 크기는 ASTM 그레인 크기 No.8.7이고, 실시예의 경우 본 발명의 결정립의 크기는 11.1로 비교예 비해 2.3정도 미세한 것으로 나타났다.1A and 2B show grain sizes of test pieces heat-treated by the high carbon heat treatment method of Comparative Examples and Examples. In the comparative example, the grain size of the high carbon carburized steel was ASTM grain size No. 8.7, and in the case of the example, the grain size of the present invention was 11.1, which was about 2.3 minute compared to the comparative example.
상술한 바와 같이 본 발명에 따른 고탄소 침탄강은 종래의 고탄소 침탄강에 비해 결정립의 크기가 미세하고, 굽힘 피로 싸이클이 훨씬 우수하여 내피팅성, 내마모성 및 마찰 특성이 요구되는 분야에 적용될 수 있다.As described above, the high carbon carburized steel according to the present invention has a finer grain size than the conventional high carbon carburized steel, and has a much superior bending fatigue cycle, and thus can be applied to fields requiring fitting resistance, wear resistance, and friction characteristics. have.
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| WO2012087028A2 (en) | 2010-12-23 | 2012-06-28 | 주식회사 포스코 | Steel sheet for an oil sand slurry pipe having excellent abrasion resistance, corrosion resistance and low-temperature toughness and method for manufacturing same |
| CN115323263A (en) * | 2022-06-30 | 2022-11-11 | 江阴兴澄特种钢铁有限公司 | Wear-resistant high-hardenability pinion steel for rear axle reduction gearbox of truck and manufacturing method |
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| JPH05263183A (en) * | 1992-03-19 | 1993-10-12 | Sumitomo Metal Ind Ltd | Carburized case hardening steel with excellent delayed fracture resistance |
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| JPH05263183A (en) * | 1992-03-19 | 1993-10-12 | Sumitomo Metal Ind Ltd | Carburized case hardening steel with excellent delayed fracture resistance |
| KR0141048B1 (en) * | 1994-02-03 | 1998-07-15 | 이와사끼 시게오 | Steel for carburized gear |
| JPH0873991A (en) * | 1994-09-05 | 1996-03-19 | Daido Steel Co Ltd | Carburizing steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2012087028A2 (en) | 2010-12-23 | 2012-06-28 | 주식회사 포스코 | Steel sheet for an oil sand slurry pipe having excellent abrasion resistance, corrosion resistance and low-temperature toughness and method for manufacturing same |
| US9238849B2 (en) | 2010-12-23 | 2016-01-19 | Posco | Steel sheet for an oil sand slurry pipe having excellent abrasion resistance, corrosion resistance, and low-temperature toughness and method for manufacturing same |
| CN115323263A (en) * | 2022-06-30 | 2022-11-11 | 江阴兴澄特种钢铁有限公司 | Wear-resistant high-hardenability pinion steel for rear axle reduction gearbox of truck and manufacturing method |
| CN115323263B (en) * | 2022-06-30 | 2024-05-17 | 江阴兴澄特种钢铁有限公司 | Wear-resistant high-hardenability gear steel for rear axle reduction gearbox of truck and manufacturing method |
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