KR101245564B1 - Gas Nitriding Heat Treatment of the Stainless steel, Heat resisting steel and High alloy steel - Google Patents

Gas Nitriding Heat Treatment of the Stainless steel, Heat resisting steel and High alloy steel Download PDF

Info

Publication number
KR101245564B1
KR101245564B1 KR1020110042893A KR20110042893A KR101245564B1 KR 101245564 B1 KR101245564 B1 KR 101245564B1 KR 1020110042893 A KR1020110042893 A KR 1020110042893A KR 20110042893 A KR20110042893 A KR 20110042893A KR 101245564 B1 KR101245564 B1 KR 101245564B1
Authority
KR
South Korea
Prior art keywords
gas
nitriding
heat treatment
temperature
ammonia
Prior art date
Application number
KR1020110042893A
Other languages
Korean (ko)
Other versions
KR20120124941A (en
Inventor
신재영
Original Assignee
주식회사 삼락열처리
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 삼락열처리 filed Critical 주식회사 삼락열처리
Priority to KR1020110042893A priority Critical patent/KR101245564B1/en
Publication of KR20120124941A publication Critical patent/KR20120124941A/en
Application granted granted Critical
Publication of KR101245564B1 publication Critical patent/KR101245564B1/en

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/24—Nitriding
    • C23C8/26—Nitriding of ferrous surfaces
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/02—Pretreatment of the material to be coated

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (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

본 발명의 목적은 부동태피막이 형성된 제품의 표면에 질화층을 형성함에 있어서 부동태피막을 제거하는 공정이 보다 간편하게 진행될 수 있고 양호한 질화층을 형성할 수 있는 가스질화 공법을 제공하는 것이다. 이에 따라 본 발명은, 대기 중에서 부동태피막이 형성된 강의 표면에 질화 경화층을 형성시키는 가스질화방법에 있어서, 열처리로의 내부에 질화처리대상물을 장입하는 단계; 상온에서 상기 열처리로의 내부에 소정의 시간동안 암모니아(NH3) 가스를 유입시켜 산소를 제거하고 암모니아 분위기로 치환하는 상온퍼지단계; 상기 상온퍼지단계후, 200~500℃의 온도까지 상승시키는 승온단계; 상기 승온단계에서 상승된 온도를 유지하면서 사염화탄소(CCl4) 또는 사염화에틸렌(C2Cl4)을 상기 열처리로의 내부로 주입하는 표면활성화단계; 및 상기 표면활성화단계 후, 상기 표면활성화단계에서의 온도 이상을 유지하면서 암모니아(NH3)가스 분위기 중에서 질화처리대상물의 표면이 질화되는 질화처리단계;를 포함하는 것을 특징으로 한다.An object of the present invention is to provide a gas nitridation method that can be more easily carried out in forming a nitride layer on the surface of the product having a passivation film formed to form a good nitride layer. Accordingly, the present invention provides a gas nitriding method for forming a nitride hardened layer on the surface of a steel on which a passivation film is formed, the method comprising the steps of: charging a nitride treatment object in a heat treatment furnace; A room temperature purge step of removing oxygen by introducing ammonia (NH 3) gas into the inside of the heat treatment furnace at a room temperature for a predetermined time; After the room temperature purge step, the temperature rising step to increase to a temperature of 200 ~ 500 ℃; Surface activation step of injecting carbon tetrachloride (CCl4) or ethylene tetrachloride (C2Cl4) into the heat treatment furnace while maintaining the elevated temperature in the temperature increase step; And a nitriding treatment step of nitriding the surface of the nitriding treatment object in an ammonia (NH 3) gas atmosphere while maintaining the temperature of the surface activation step after the surface activation step.

Description

스테인레스강, 내열강 및 고합금강에 대한 가스질화방법{Gas Nitriding Heat Treatment of the Stainless steel, Heat resisting steel and High alloy steel}Gas Nitriding Heat Treatment of the Stainless steel, Heat resisting steel and High alloy steel}

본 발명은 부동태피막이 형성된 강재(스테인레스강, 내열강, 고합금강)의 가스질화 열처리 방법에 관한 것으로, 열처리 공정 중에 표면 활성화 공정을 이용하여 매우 간단하게 부동태피막을 제거하고 표면을 질화(Nitriding)처리하는 공정 기술에 관한 것이다.The present invention relates to a method of gas-nitriding heat treatment of steel (stainless steel, heat-resistant steel, high-alloy steel) on which a passivation film is formed, and very simple to remove the passivation film and nitriding the surface by using a surface activation process during the heat treatment process. It relates to process technology.

가스질화 열처리란 암모니아(NH3) 가스의 열적, 화학적 반응에 의해 분해된 질소(N)를 강재 표면에 확산침투시키는 표면 열처리 기술이다. Gas-nitriding heat treatment is a surface heat treatment technique in which nitrogen (N), which is decomposed by a thermal and chemical reaction of ammonia (NH 3) gas, diffuses and penetrates the steel surface.

그러나 일반적인 가스질화 열처리에서는 스테인레스강, 내열강, 고합금강의 경우 질화 열처리가 용의하지 않으며, 이는 강재 표면에 매우 치밀한 격자구조를 가진 부동태 산화피막(Cr2O3)이 형성되어 있어 분해된 질소가 확산 침투되지 못하기 때문이다.However, in general gas nitriding heat treatment, nitriding heat treatment is not easy for stainless steel, heat resistant steel, and high alloyed steel, which has a highly dense passivated oxide film (Cr 2 O 3 ) formed on the surface of the steel, resulting in decomposed nitrogen. This is because the diffusion can not penetrate.

일반적으로 부동태 피막이 형성된 강재는 가스질화처리가 용의하지 않으며, 표면에 쇼트나 샌딩을 이용하여 물리적으로 부동태 피막(Cr2O3)을 제거하거나 화학적인 산처리를 통해 질화 열처리를 진행한다.In general, the steel formed with the passivation coating is not intended for the gas nitriding treatment, and the surface is subjected to nitriding heat treatment through the removal of the passivation coating (Cr 2 O 3 ) physically or by chemical acid treatment using shot or sanding.

본 발명은 일반 가스질화 공법에 표면활성화 공정을 추가하여 스테인레스강, 내열강, 고합금강, 다이스공구강(SKD), 티타늄 합금강(Ti-alloy steel) 등과 같은 강재를 용이하게 열처리하는 공법을 제공하는 것이다.The present invention is to provide a method for easily heat-treating a steel, such as stainless steel, heat-resistant steel, high alloy steel, SKD, titanium alloy steel (Ti-alloy steel) by adding a surface activation process to the general gas nitriding method.

상기 목적을 달성하기 위한 본 발명은, 가장 상용화된 가스질화장비에서 부동태피막이 형성된 강 표면의 부동태피막을 공정 중에 제거하고 질화 경화층을 형성시키는 열처리 방법이다. The present invention for achieving the above object is a heat treatment method for removing the passivation film on the steel surface on which the passivation film is formed in the most commercialized gas nitride equipment during the process to form a nitride hardened layer.

그 방법에 있어 열처리로의 내부에 질화 처리대상물을 장입하는 단계; 상온에서 상기 열처리로의 내부에 소정의 시간동안 암모니아(NH3) 가스를 유입시켜 산소를 제거하고 암모니아 분위기로 치환하는 상온퍼지단계; 상기 상온 퍼지단계 후, 200~500℃의 온도까지 상승시키는 승온단계; 상기 승온단계에서 상승된 온도를 유지하면서 사염화탄소(CCl4) 또는 사염화에틸렌(C2Cl4)을 상기 열처리로의 내부로 주입하여 제품표면을 활성화하는 단계; 및 상기 표면활성화단계 후, 상기 표면활성화단계에서의 온도 이상을 유지하면서 암모니아(NH3) 가스 분위기 중에서 질화처리대상물의 표면이 질화되는 질화처리단계;를 포함하는 것을 특징으로 한다.Charging the nitriding treatment object in the heat treatment furnace in the method; A room temperature purge step of removing oxygen by introducing ammonia (NH 3 ) gas into the inside of the heat treatment furnace at a room temperature for a predetermined time; After the normal temperature purge step, the temperature rising step to increase to a temperature of 200 ~ 500 ℃; Activating a product surface by injecting carbon tetrachloride (CCl4) or ethylene tetrachloride (C2Cl4) into the heat treatment furnace while maintaining the elevated temperature in the temperature raising step; And a nitriding treatment step of nitriding the surface of the nitriding treatment object in an ammonia (NH 3 ) gas atmosphere while maintaining the temperature of the surface activation step after the surface activation step.

또한, 본 발명은 상기 상온퍼지단계에서 상기 암모니아 가스를 유입시키기 전에 질소(N2)가스를 소정의 시간동안 유입시켜 상기 열처리로를 질소분위기로 치환하는 질소퍼지단계를 포함하는 것을 다른 특징으로 한다.In addition, the present invention is characterized in that it comprises a nitrogen purge step of introducing the nitrogen (N 2 ) gas for a predetermined time before the inflow of the ammonia gas in the room temperature purge step to replace the heat treatment furnace with a nitrogen atmosphere. .

또한, 본 발명은 상기 표면활성화단계에서 계속 암모니아 가스를 유입시키고, 상기 사염화탄소(CCl4) 또는 사염화에틸렌(C2Cl4)은 유입되는 상기 암모니아 가스와 함께 상기 열처리로의 내부에 흘러 들어가도록 주입하는 것을 또 다른 특징으로 한다.In addition, the present invention continues to introduce ammonia gas in the surface activation step, the carbon tetrachloride (CCl4) or ethylene tetrachloride (C2Cl4) is injected to flow into the interior of the heat treatment furnace with the introduced ammonia gas is another It features.

본 발명에 따른 질화처리방법은 다음과 같은 효과를 갖는다.The nitriding treatment method according to the present invention has the following effects.

첫째, 본 발명은 부동태피막이 형성된 제품의 질화처리를 위해 질화 대상물이 장입되어 있는 열처리로 내부에 사염화탄소(CCl4) 또는 사염화에틸렌(C2Cl4)을 주입하여 부동태피막을 공정 중에 제거하고 있으므로, 염산용액에 침지시키거나 표면을 샌딩처리하는 종래의 방법에 비하여 매우 간편하고 공정의 효율도 높다. 또한, 산처리에 따른 작업자의 위험성도 제거된다.First, the present invention injects carbon tetrachloride (CCl4) or ethylene tetrachloride (C2Cl4) into a heat treatment furnace in which a nitriding object is loaded for nitriding a product having a passivation film, thereby removing the passivation film during the process, soaking in a hydrochloric acid solution. Compared to the conventional method of making or sanding the surface, it is very simple and the process efficiency is high. In addition, the risk of an operator due to acid treatment is also eliminated.

둘째, 본 발명은 암모니아 분위기로 치환하는 상온퍼지단계에서 암모니아가 투입되기에 앞서 질소분위기로 전환되는 질소퍼지가 먼저 실시되므로 열처리로 내에 잔존한 산소와 암모니아가 반응하여 수분을 생성시키는 일이 발생하지 않는다.Second, in the present invention, the nitrogen purge is first converted to the nitrogen atmosphere before the ammonia is introduced in the room temperature purge step of replacing the ammonia atmosphere, so that oxygen and ammonia remaining in the heat treatment furnace react to generate moisture. Do not.

셋째, 상기 사염화탄소(CCl4) 또는 사염화에틸렌(C2Cl4)은 암모니아 가스와 함께 열처리로의 내부에 흘러 들어가도록 주입하게 되므로, 유동하는 암모니아 가스에 의해 액상인 사염화탄소(CCl4) 또는 사염화에틸렌(C2Cl4)을 쉽게 열처리로 내부로 유입시킬 수 있고 열처리로 내부에서의 확산도 양호하게 발생하게 된다.Third, since the carbon tetrachloride (CCl4) or ethylene tetrachloride (C2Cl4) is injected into the heat treatment furnace together with the ammonia gas, the liquid carbon tetrachloride (CCl4) or ethylene tetrachloride (C2Cl4) is easily injected by the flowing ammonia gas. It can be introduced into the heat treatment furnace and the diffusion in the heat treatment furnace is good.

도 1은 본 발명의 실시예에 따라 질화처리공정을 실시하기 위한 열처리로의 구성도
도 2는 본 발명에서 질화처리의 대상으로 하고 있는 금속재질을 예시한 표
도 3는 본 발명의 실시예에 따른 질화처리공정을 나타내는 그래프
도 4은 본 발명의 실시예에 따른 질화처리방법을 시험하기 위한 시편 형태
도 5 내지 도 7은 본 발명에 따라 도 3의 시편이 질화처리된 후 재질별 시료에 형성된 질화층 조직사진1 is a block diagram of a heat treatment furnace for performing a nitriding treatment process according to an embodiment of the present invention
Figure 2 is a table illustrating a metal material that is subjected to nitriding treatment in the present invention
3 is a graph showing a nitriding treatment process according to an embodiment of the present invention.
Figure 4 is a specimen form for testing the nitriding treatment method according to an embodiment of the present invention
5 to 7 is a nitride layer tissue photograph formed on the sample according to the material after the specimen of Figure 3 is nitrided according to the present invention

이하 본 발명의 바람직한 실시예를 첨부된 도면을 참조하여 보다 상세하게 설명한다. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 1은 본 발명의 실시예에 따른 질화처리공정을 실시하는 열처리로의 구조를 도시하고 있다.1 shows the structure of a heat treatment furnace for performing a nitriding treatment process according to an embodiment of the present invention.

도 1의 유입관로(22)에는 사염화탄소(CCl4) 또는 사염화에틸렌(C2Cl4)을 공급할 수 있는 주입장치(24)가 설치된다. 상기 주입장치(24)는 사염화탄소(CCl4) 또는 사염화에틸렌(C2Cl4) 용액을 유입관로(22)에서 유입되는 가스와 함께 열처리로(10) 내부에 흘러들어가도록 하는 것이다.The inlet pipe 22 of FIG. 1 is provided with an injection device 24 capable of supplying carbon tetrachloride (CCl4) or ethylene tetrachloride (C2Cl4). The injection device 24 allows the carbon tetrachloride (CCl4) or ethylene tetrachloride (C2Cl4) solution to flow into the heat treatment furnace 10 together with the gas introduced from the inlet pipe 22.

본 발명에서 질화처리의 대상으로 하고 있는 금속은 도 2에 나타내었으며 모두 다량의 크롬(Cr)이 함유되어 대기 중에서 산화크롬피막(부동태피막)이 형성되는 강재들이다. Ti6AlV4는 Ti가 주성분으로 표면에 TiO의 산화 티타늄층의 부동태 피막이 형성되어있다.The metals to be subjected to nitriding in the present invention are shown in FIG. 2 and are all steels in which a large amount of chromium (Cr) is contained to form a chromium oxide film (floating film) in the air. Ti6AlV4 has Ti as a main component and a passivation film of a titanium oxide layer of TiO is formed on the surface.

이하, 도 3을 참고하여 상기 열처리로(10)에서 이루어지는 본 발명의 가스질화방법을 설명한다.Hereinafter, the gas nitriding method of the present invention made in the heat treatment furnace 10 will be described with reference to FIG. 3.

본 발명의 실시예에 따른 가스질화방법은 열처리로(10)의 내부에 질화처리대상물(30)을 장입하는 단계; 상온에서 상기 열처리로(10)의 내부에 소정의 시간동안 암모니아(NH3)가스를 투입하여 산소를 제거하고 암모니아 분위기로 치환하는 상온퍼지단계(S1); 상기 상온퍼지단계후, 200~500℃의 온도까지 상승시키는 승온단계(S2); 상기 승온단계(S2)에서 상승된 온도를 유지하면서 사염화탄소(CCl4) 또는 사염화에틸렌(C2Cl4)을 주입하는 표면활성화단계(S3); 및 상기 표면활성화단계(S3) 후, 상기 표면활성화단계(S3)에서의 온도 이상을 유지하면서 암모니아(NH3)가스 분위기 중에서 질화처리대상물(30)의 표면이 질화되는 질화처리단계(S4);를 포함한다. Gas nitriding method according to an embodiment of the present invention comprises the steps of charging the nitriding treatment object 30 in the heat treatment furnace (10); A room temperature purge step (S1) of adding oxygen to the ammonia (NH3) gas for a predetermined time in the heat treatment furnace 10 at room temperature to remove oxygen and to substitute the ammonia atmosphere; After the room temperature purge step, the temperature rising step (S2) to increase to a temperature of 200 ~ 500 ℃; Surface activation step (S3) of injecting carbon tetrachloride (CCl4) or ethylene tetrachloride (C2Cl4) while maintaining the elevated temperature in the temperature raising step (S2); And a nitriding treatment step (S4) of nitriding the surface of the nitriding treatment object (30) in an ammonia (NH3) gas atmosphere while maintaining the temperature in the surface activation step (S3) after the surface activation step (S3). Include.

상기 상온퍼지단계(S1)는 암모니아가스를 유입시키기 전에 질소가스(N2)를 투입하는 질소퍼지단계(S1-1)를 먼저 실시한다. In the room temperature purge step S1, a nitrogen purge step S1-1 for introducing nitrogen gas N2 is first performed before introducing ammonia gas.

열처리로(10)의 내부압력을 일정하게 유지시키고, 질소가스(N2)를 수 시간 투입한다. The internal pressure of the heat treatment furnace 10 is kept constant, and nitrogen gas (N2) is added for several hours.

질소가스에 의한 열처리로(10) 내부의 퍼지가 끝나면 암모니아 퍼지를 실시한다. 열처리로(10)에 암모니아 가스를 투입할 때는 열처리로(10) 체적의 수 배 이상의 암모니아 가스를 투입한다. 또한 암모니아 가스만에 의한 상온퍼지도 가능하나, 질소 가스에 의한 퍼지를 먼저 실시함으로써 잔존하고 있는 산소와 암모니아 가스가 반응하여 수분을 생성하는 것을 방지할 수 있다. When the purge inside the heat treatment furnace 10 by nitrogen gas is finished, ammonia purge is performed. When ammonia gas is injected into the heat treatment furnace 10, ammonia gas at least several times the volume of the heat treatment furnace 10 is introduced. Moreover, although room temperature purge by only ammonia gas is possible, purge by nitrogen gas is performed first, and it can prevent that the oxygen which remain | survives reacts with ammonia gas, and produces | generates water.

상온퍼지단계(S1)가 완료되면, 200~500℃의 온도까지 상승시키는 승온단계(S2)를 실시한다. When the room temperature purge step S1 is completed, a temperature raising step S2 is performed to raise the temperature to 200 ° C to 500 ° C.

상기 승온단계(S2)가 실시되는 중에도 암모니아 가스를 계속해서 투입함으로써 암모니아 분위기를 유지시킨다.The ammonia atmosphere is maintained by continuously injecting ammonia gas even while the temperature raising step S2 is performed.

상기 승온단계(S2)가 완료되어 열처리로(10) 내부의 온도가 200 ~ 500℃의 온도가 되면, 승온된 온도를 유지하면서 표면활성화단계(S3)를 진행한다. When the temperature raising step (S2) is completed and the temperature inside the heat treatment furnace 10 is a temperature of 200 ~ 500 ℃, the surface activation step (S3) is carried out while maintaining the elevated temperature.

상기 표면활성화단계(S3)는 질화 처리대상물(30)의 표면에서 부동태피막을 제거하기 위한 과정으로, 사염화탄소(CCl4) 또는 사염화에틸렌(C2Cl4)을 투입하여 부동태피막을 제거하는 과정이다. 사염화탄소(CCl4) 또는 사염화에틸렌(C2Cl4) 용액은 도 1에서 도시하는 바와 같이 주입장치(24)를 통해서 유입관로(22)로 유입되는 가스와 함께 열처리로(10) 내부에 흘러들어가도록 한다.The surface activation step (S3) is a process for removing the passivation film from the surface of the nitride treatment object 30, and is a process of removing the passivation film by adding carbon tetrachloride (CCl4) or ethylene tetrachloride (C2Cl4). Carbon tetrachloride (CCl4) or ethylene tetrachloride (C2Cl4) solution is allowed to flow into the heat treatment furnace 10 together with the gas flowing into the inlet pipe 22 through the injection device 24 as shown in FIG.

이에 따라, 열처리로 내에서 상기 사염화탄소(CCl4) 또는 사염화에틸렌(C2Cl4)은 암모니아 가스와 반응하여 염산을 생성하고, 처리대상물(30)의 표면에 형성된 부동태피막을 산처리함으로써 부동태 피막이 제거된다. Accordingly, the carbon tetrachloride (CCl4) or ethylene tetrachloride (C2Cl4) reacts with ammonia gas to generate hydrochloric acid, and the passivation film is removed by acid treatment of the passivation film formed on the surface of the object 30 in the heat treatment furnace.

표면활성화단계(S3)에 의해 질화 처리대상물(30)의 표면에서 부동태피막이 제거되고 질화 처리가 가능한 표면이 형성된다.The passivation film is removed from the surface of the nitride treatment object 30 by the surface activation step S3, and a surface capable of nitriding treatment is formed.

상기 표면활성화단계(S3)가 완료되면, 가스질화에 의한 질화처리단계(S4)를 실시한다. 즉, 400~850℃의 온도범위 중 상기 표면활성화단계(S3)에서의 온도 이상(표면활성화단계에서 온도와 동일한 온도를 포함하는 의미이다)을 유지하면서 암모니아가스와 함께 질소가스 혹은 이산화탄소(CO2) 가스 등을 유입시켜 일반적인 가스질화를 실시한다. When the surface activation step S3 is completed, the nitriding treatment step S4 is performed by gas nitriding. That is, nitrogen gas or carbon dioxide (CO2) together with ammonia gas, while maintaining the temperature above the temperature in the surface activation step (S3) (meaning the same temperature as the temperature in the surface activation step) of the temperature range of 400 ~ 850 ℃. General gas nitriding is performed by introducing gas.

상기 질화처리단계(S4)는 획일화된 공정이 아니므로 표면활성화단계(S3) 이후에 공지된 다양한 질화처리공정이 접목될 수 있다.Since the nitriding treatment step (S4) is not a uniform process, various known nitriding treatment processes may be combined after the surface activation step (S3).

시험예Test Example

본 발명에 따른 가스질화방법을 도 4와 같은 크기의 시편에 대하여 도 2에 표시된 다양한 재질의 시료에 적용하여 시험하였다.The gas nitriding method according to the present invention was tested by applying the sample of various materials shown in FIG.

열처리로는 피트형(PIT TYPE)의 일반적인 가스질화로를 사용하였다.PIT TYPE general gas nitriding furnace was used for the heat treatment.

도 5 내지 도 7은 상기와 같이 실험된 다양한 재질의 시험결과를 나타내는 조직사진을 재질, 질화온도 및 질화시간과 함께 나타낸 것이다. 시험결과를 통해 본 발명에 따른 가스질화방법이 부동태피막을 제거하고 양호한 질화층을 형성하고 있음을 알 수 있다.5 to 7 shows a tissue photograph showing the test results of the various materials tested as described above with the material, the nitriding temperature and the nitriding time. The test results show that the gas nitriding method according to the present invention removes the passivation film and forms a good nitride layer.

상기의 실시예는 본 발명의 기술적 사상의 범위 내에 있는 일 실시예에 불과하며, 동업계의 통상의 기술자에 있어서는, 본 발명의 기술적인 사상 내에서 다른 변형된 실시가 가능함은 물론이다.The above embodiment is merely an embodiment within the scope of the technical idea of the present invention, and of course, other modifications can be made within the technical idea of the present invention by those skilled in the art.

10; 열처리로 12; 히터
13; 팬 14; 전동기
22; 유입관로 24; 주입장치
30; 질화처리대상물 42; 배출관로10; Heat treatment furnace 12; heater
13; Fan 14; Electric motor
22; Inlet line 24; Injection device
30; Nitrification target 42; As discharge pipe

Claims (3)

대기 중에서 부동태피막이 형성된 강의 표면에 질화 경화층을 형성시키는 가스질화방법에 있어서,
열처리로(10)의 내부에 질화 처리대상물(30)을 장입하는 단계;
상기 질화 처리대상물(30)의 장입 후, 상온에서 상기 열처리로(10)의 내부에 암모니아(NH3)가스를 유입시켜 산소를 제거하고 암모니아 분위기로 치환하는 상온퍼지단계(S1);
상기 상온퍼지단계(S1)후, 200~500℃의 온도까지 상승시키는 승온단계(S2);
상기 승온단계(S2)에서 상승된 온도를 유지하면서 사염화탄소(CCl4) 또는 사염화에틸렌(C2Cl4)을 상기 열처리로(10) 내부로 주입하고, 주입된 상기 사염화탄소(CCl4) 또는 사염화에틸렌(C2Cl4)이 상기 암모니아(NH3)가스와 반응함으로써 상기 질화 처리대상물(30)의 표면에 형성된 부동태피막이 제거되는 표면활성화단계(S3);
및
상기 표면활성화단계(S3) 후, 상기 표면활성화단계(S3)에서의 온도 이상을 유지하면서 암모니아(NH3)가스 분위기 중에서 질화 처리대상물(30)의 표면이 질화되는 질화처리단계(S4);를 포함하는 것을 특징으로 하는 가스질화방법In the gas nitriding method of forming a nitride hardened layer on the surface of the steel on which the passivation film is formed in the air,
Charging the nitriding treatment object 30 into the heat treatment furnace 10;
A normal temperature purge step (S1) of removing oxygen by introducing ammonia (NH 3) gas into the heat treatment furnace 10 at room temperature after charging the nitriding treatment object 30;
After the room temperature purge step (S1), the temperature rising step (S2) to increase to a temperature of 200 ~ 500 ℃;
Carbon tetrachloride (CCl4) or ethylene tetrachloride (C2Cl4) is injected into the heat treatment furnace 10 while maintaining the elevated temperature in the temperature raising step (S2), and the injected carbon tetrachloride (CCl4) or ethylene tetrachloride (C2Cl4) is A surface activation step of removing the passivation film formed on the surface of the nitriding treatment object 30 by reacting with ammonia (NH 3) gas (S 3);
And
After the surface activation step (S3), the nitriding treatment step (S4) of nitriding the surface of the nitride treatment object 30 in the ammonia (NH3) gas atmosphere while maintaining the temperature in the surface activation step (S3); Gas nitriding method, characterized in that 제1항에 있어서,
상기 상온퍼지단계(S1)에서
상기 암모니아(NH3)가스를 유입시키기 전에 질소(N2)가스를 유입시켜 상기 열처리로(10)를 질소분위기로 치환하는 질소퍼지단계(S1-1)를 포함하는 것을 특징으로 하는 가스질화방법The method of claim 1,
In the room temperature purge step (S1)
Nitrogen purge step (S1-1) for introducing a nitrogen (N2) gas before the ammonia (NH3) gas is introduced to replace the heat treatment furnace 10 with a nitrogen atmosphere (S1-1) 제1항 또는 제2항에 있어서,
상기 표면활성화단계(S3)에서 계속 암모니아가스를 유입시키고,
상기 사염화탄소(CCl4) 또는 사염화에틸렌(C2Cl4)은 유입되는 상기 암모니아 가스와 함께 상기 열처리로(10)의 내부에 흘러 들어가도록 주입하는 것을 특징으로 하는 가스질화방법The method according to claim 1 or 2,
Continued inflow of ammonia gas in the surface activation step (S3),
The carbon tetrachloride (CCl4) or ethylene tetrachloride (C2Cl4) is injected into the inside of the heat treatment furnace 10 with the ammonia gas introduced therein, characterized in that the gas nitriding method
KR1020110042893A 2011-05-06 2011-05-06 Gas Nitriding Heat Treatment of the Stainless steel, Heat resisting steel and High alloy steel KR101245564B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020110042893A KR101245564B1 (en) 2011-05-06 2011-05-06 Gas Nitriding Heat Treatment of the Stainless steel, Heat resisting steel and High alloy steel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020110042893A KR101245564B1 (en) 2011-05-06 2011-05-06 Gas Nitriding Heat Treatment of the Stainless steel, Heat resisting steel and High alloy steel

Publications (2)

Publication Number Publication Date
KR20120124941A KR20120124941A (en) 2012-11-14
KR101245564B1 true KR101245564B1 (en) 2013-03-20

Family

ID=47510196

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020110042893A KR101245564B1 (en) 2011-05-06 2011-05-06 Gas Nitriding Heat Treatment of the Stainless steel, Heat resisting steel and High alloy steel

Country Status (1)

Country Link
KR (1) KR101245564B1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101453380B1 (en) * 2012-12-20 2014-10-22 한국생산기술연구원 Metal surface nitride-treatment apparatus and method of nitride-treatment
CN104870681B (en) * 2012-12-20 2017-08-29 韩国生产技术研究院 Metal surface treating apparatus and the metal surface treating method using the device
KR102106645B1 (en) * 2018-07-25 2020-05-04 주식회사 현대케피코 Method for enhancing the property of a injector component and an injector manufactured through the method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20060114368A (en) * 2004-01-20 2006-11-06 파커 네쓰쇼리 고교 가부시키카이샤 Method for activating surface of metal member
KR20080092142A (en) * 2007-04-11 2008-10-15 김익희 Method for treat of heat resisting steel by gas nitriding

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20060114368A (en) * 2004-01-20 2006-11-06 파커 네쓰쇼리 고교 가부시키카이샤 Method for activating surface of metal member
KR20080092142A (en) * 2007-04-11 2008-10-15 김익희 Method for treat of heat resisting steel by gas nitriding

Also Published As

Publication number Publication date
KR20120124941A (en) 2012-11-14

Similar Documents

Publication Publication Date Title
KR100858598B1 (en) Method for activating surface of metal member
JP2007046088A (en) Nitrided quenched part, and method for producing the same
US9738963B2 (en) Method for manufacturing ferritic stainless steel product
KR101245564B1 (en) Gas Nitriding Heat Treatment of the Stainless steel, Heat resisting steel and High alloy steel
US8414710B2 (en) Method for surface treatment of metal material
JP2015052150A (en) Surface hardening treatment method for steel member and surface hardening treatment device
WO2016054722A1 (en) Method for heat treating long steel pipes
KR102196477B1 (en) Method of thermal nitriding of workpiece surface
JP4771718B2 (en) Metal nitriding method
KR101742685B1 (en) Low-Temperature Vacuum Carburizing Method
CN101238236B (en) Ion nitriding method
JP2021042398A (en) Nitrided steel member, and method and apparatus for manufacturing the same
CN109923219B (en) Method for heat treating workpieces made of high-alloy steel
JP6543213B2 (en) Surface hardening method and surface hardening apparatus
KR20120035444A (en) Real time nitriding depth monitoring method and apparatus for plasma nitriding process
KR102188994B1 (en) Low-Temperature Carburizing Method by Controlling Carbon Potential
KR20170052485A (en) Low-Temperature Vacuum Carburizing Method
KR101911622B1 (en) Method and apparatus for gas nitriding
KR100837789B1 (en) Nitriding treatment method
KR102188995B1 (en) Low-Temperature Carburizing Method Using Native Oxide Removal Gas
RU2796338C1 (en) Method for surface treatment of heat-resistant stainless steel
RU2790841C1 (en) Method for surface treatment of heat-resistant stainless steel
JP2005120404A (en) Gas carburization method, gas carbonitriding method, and surface treatment device
JP4858071B2 (en) Steel surface treatment method and surface-treated steel material
JP4494996B2 (en) Passivation membrane removal method

Legal Events

Date Code Title Description
A201 Request for examination
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20160202

Year of fee payment: 4

LAPS Lapse due to unpaid annual fee