High carbon carburizing material

专利摘要:
The present invention relates to a material for high carbon carburizing, and more particularly, by combining carbon, silicon, manganese, chromium, molybdenum, vanadium, and titanium to improve surface hardness and to be applicable to gears under high temperature extreme pressure lubrication. The present invention relates to a high carbon carburizing material having improved fatigue strength.
公开号:KR19980055647A
申请号:KR1019960074881
申请日:1996-12-28
公开日:1998-09-25
发明作者:안승균
申请人:박병재；현대자동차 주식회사；
IPC主号:

专利说明:

High carbon carburizing material
The present invention relates to a material for high carbon carburizing, and more particularly, by combining carbon, silicon, manganese, chromium, molybdenum, vanadium, and titanium to improve surface hardness and to be applicable to gears under high temperature extreme pressure lubrication. The present invention relates to a high carbon carburizing material having improved fatigue strength.
In general, carburizing products of transmission materials of automobiles are softened due to frictional heat under high pressure and rotation, and thus there is a problem that the resistance to minor wear and welding wear is reduced.
In order to solve this problem, research on high carbon carburizing method has been conducted since the 1960s, but it is difficult to control the amount, shape, and particle size of carbides, and it is easy to precipitate network carbides which are dangerous to austenite grain boundaries, and to alloy steels. Carbide generation element has a small problem, such as a lot of problems in practical use.
The present invention provides a high carbon carburizing material that can maximize the wear and fatigue properties of the material through the spheroidization and miniaturization of carbide by combining vanadium and titanium to solve the problems of the high carbon carburizing material as described above The purpose is.
The present invention is 0.15 to 0.25% by weight of silicon, 0.20 to 0.40% by weight of silicon, 0.30 to 0.80% by weight of manganese, 2.0 to 2.5% by weight of chromium, 0.30 to 0.70% by weight of molybdenum, 0.015 to 0.030% by weight of vanadium and 0.025 to 0.050% by weight of titanium. It is characterized by a high carbon carburizing material made by adding%.
The present invention will be described in more detail as follows.
The present invention relates to a high carbon carburizing material having improved fatigue strength.
In the present invention, carbon should be contained as a basic element for determining strength in order to obtain a heat treatment effect, and if it is less than 0.15% by weight, there is a problem that the strength drops. If the content of carbon exceeds 0.25% by weight, there is a problem inferior in toughness.
Silicon is a deoxidizer to be added when steelmaking is contained in a basic range of 0.20 to 0.40% by weight.
Manganese is an element that improves the hardenability. It is added to complement the strength instead of reducing the carbon content. If it is less than 2.0 wt%, sufficient hardening hardness cannot be obtained. If it exceeds 0.80 wt%, the hardenability becomes saturated and toughness There is a problem of deterioration.
Chromium is added to improve the quenching property. If the content is less than 0.30% by weight, the effect is insignificant, and if it exceeds 2.5% by weight, cracking occurs during water cooling.
On the other hand, molybdenum is added to the alloy powder to form hard particles to improve wear resistance. If the content is less than 0.30% by weight, the wear resistance is not effective, and when the content exceeds 0.70% by weight, the counterpart wears.
Vanadium is added as a ferrite strengthening and precipitate component, and the strength improvement effect is insignificant at less than 0.015% by weight, and the strength improvement effect no longer rises above 0.030% by weight.
Finally, titanium is added as a grain refining element, which inhibits crystal growth, especially at high temperatures, and when it is less than 0.025% by weight, the grain refining effect is insignificant, and when it exceeds 0.050% by weight, the effect is saturated.
High carbon carburizing material having the composition as described above is fine spherical carbide is formed on the carburized surface to improve the surface hardness to more than 800 Hv and the fitting strength is also improved by more than 20% compared to the general high carbon carburizing material.
In addition, the high temperature softening resistance and the fusion wear resistance are improved, which is applicable to gears in the high temperature extreme pressure lubrication state, and the bending fatigue strength is improved by 20% or more.
The high carbon carburizing material according to the present invention has excellent fatigue strength and is excellent in resistance to small wear and fusion wear without being softened due to frictional heat under high internal pressure and high rotation as a vehicle transmission material.

权利要求:
Claims (1)
[1" claim-type="Currently amended] 0.15 to 0.25% by weight of carbon, 0.20 to 0.40% by weight of silicon, 0.30 to 0.80% by weight of manganese, 2.0 to 2.5% by weight of chromium, 0.30 to 0.70% by weight of molybdenum, 0.015 to 0.030% by weight of vanadium and 0.025 to 0.050% by weight of titanium High carbon carburizing material, characterized in that made.

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同族专利:

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引用文献:

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公开号 | 申请日 | 公开日 | 申请人 | 专利标题

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法律状态:
1996-12-28|Application filed by 박병재, 현대자동차 주식회사

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1996-12-28|Priority to KR1019960074881A

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1998-09-25|Publication of KR19980055647A

优先权:

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申请号 | 申请日 | 专利标题

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KR1019960074881A|KR19980055647A|1996-12-28|1996-12-28|High carbon carburizing material|