KR100807807B1 - The heat treatment process of connecting member made of stainless steel on fitting tube - Google Patents

The heat treatment process of connecting member made of stainless steel on fitting tube Download PDF

Info

Publication number
KR100807807B1
KR100807807B1 KR1020070009962A KR20070009962A KR100807807B1 KR 100807807 B1 KR100807807 B1 KR 100807807B1 KR 1020070009962 A KR1020070009962 A KR 1020070009962A KR 20070009962 A KR20070009962 A KR 20070009962A KR 100807807 B1 KR100807807 B1 KR 100807807B1
Authority
KR
South Korea
Prior art keywords
connecting member
heat treatment
nitrogen
stainless steel
tube fitting
Prior art date
Application number
KR1020070009962A
Other languages
Korean (ko)
Inventor
안진현
Original Assignee
(주)세원금속
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 (주)세원금속 filed Critical (주)세원금속
Priority to KR1020070009962A priority Critical patent/KR100807807B1/en
Application granted granted Critical
Publication of KR100807807B1 publication Critical patent/KR100807807B1/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
    • C23C8/28—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 more than one element being applied in one step
    • C23C8/30—Carbo-nitriding
    • 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
    • C21D3/00—Diffusion processes for extraction of non-metals; Furnaces therefor
    • C21D3/02—Extraction of non-metals
    • C21D3/04—Decarburising
    • 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
    • C21D3/00—Diffusion processes for extraction of non-metals; Furnaces therefor
    • C21D3/02—Extraction of non-metals
    • C21D3/08—Extraction of nitrogen
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
    • 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
    • C23C8/34—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 more than one element being applied in more than one step

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Heat Treatment Of Articles (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)

Abstract

A heat treatment method for producing a high quality connecting member for tube fitting is provided to simplify the operation process and improve connecting properties of tubes by improving wear resistance of a connecting member for tube fitting made of stainless steel and reducing a corrosion phenomenon generated on a surface of the connecting member, and improve corrosion resistance by regenerating a passive film damaged in the heat treatment process of the connecting member. A heat treatment method of a connecting member for tube fitting made of stainless steel comprises: a carbonitriding process(S1) performed on a surface of the connecting member by preheating the connecting member using nitrogen gas in a combined heat treatment furnace, nitriding the preheated connecting member in a nitrogen gas atmosphere, and subjecting the nitrided connecting member to the carbonitriding process using nitrogen, ammonia and propane gas, or nitrogen, ammonia and carbon dioxide gas; a decarburizing and denitriding process(S2) performed on the carbonitrided connecting member by decarburizing the carbonitrided connecting member using air and cooling the decarburized connecting member using nitrogen; a barrel grinding process(S3) performed on the decarburized and denitrided connecting member to improve the entire surface roughness of the connecting member by grinding the connecting member; and a passive film regenerating process(S4) of inspecting the grinded connecting member and regenerating a passive film on a surface of the inspected connecting member.

Description

스테인레스강을 소재로 사용한 튜브피팅용 연결부재의 열처리 제조방법{The Heat Treatment Process of Connecting member made of Stainless Steel on Fitting Tube}The heat treatment process of connecting member made of stainless steel on fitting tube

도 1a은 락 타입(lok type) 튜브피팅의 구성도.1A is a block diagram of a lok type tube fitting.

도 1b는 도 1a의 결합 단면도.1B is a cross sectional view of FIG. 1A;

도 2a은 바이트 타입(bite type) 튜브피팅의 구성도.2A is a block diagram of a bite type tube fitting.

도 2b는 도 2a의 결합 단면도.2B is a cross sectional view of FIG. 2A;

도 3a는 딘 타입(din type) 튜브피팅의 구성도.3A is a schematic diagram of a din type tube fitting.

도 3b은 도 3a의 결합 단면도.3B is a cross sectional view of FIG. 3A.

도 4는 본 발명에 의한 스테인레스강을 소재로 사용한 튜브피팅용 연결부재의 열처리 제조공정도.Figure 4 is a heat treatment manufacturing process of the tube fitting connecting member using a stainless steel material according to the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

10 ; 피팅몸체 20 ; 전방페롤10; Fitting body 20; Anterior ferrol

30 ; 후방페롤 31 ; 전방부30; Posterior ferrol 31; Front

40 ; 너트 50 ; 튜브40; Nut 50; tube

60 ; 바이트 타입 슬리브 70 ; 딘 타입 슬리브60; Byte type sleeve 70; Dean type sleeve

본 발명은 두 배관의 연결시 사용되는 스테인레스강을 소재로 한 튜브피팅용 연결부재의 열처리 제조방법에 관한 것으로서, 보다 상세하게는 상기 연결부재의 열처리 과정중 발생하는 표면부식현상을 감소시키고, 손상된 스테인레스강의 부동태 피막을 재생시켜 내부식성을 향상시키며, 표면 가공 시간을 단축시킴과 동시에, 상기 튜브피팅용 연결부재의 튜브 물림 기능을 향상시킨 고품질의 튜브피팅용 연결부재를 생산해 낼 수 있도록 한 스테인레스강을 소재로 사용한 튜브피팅용 연결부재의 열처리 제조방법에 관한 것이다.The present invention relates to a heat treatment manufacturing method of a tube fitting connecting member made of stainless steel used when connecting two pipes, and more particularly, to reduce the surface corrosion phenomenon occurring during the heat treatment process of the connecting member, Regenerates the passivation film of stainless steel to improve corrosion resistance, shorten the surface processing time, and at the same time, to produce high quality tube fitting connecting member which improves the tube biting function of the tube fitting connecting member. It relates to a heat treatment manufacturing method of the tube fitting connecting member using the material.

일반적으로 직경이 작은 배관인 튜브등의 체결 구조물로서는 튜브피팅(Tube Fitting)을 사용한다. 도 1a내지 도 3b에 도시된 바와 같이, 튜브피팅에는 락 타입(lok type), 바이트 타입(bite type), 및 딘 타입(Din type)이 통상적으로 많이 사용되고 있다.In general, a tube fitting is used as a fastening structure such as a tube having a small diameter pipe. As shown in FIGS. 1A to 3B, a tube type, a lock type, a bite type, and a din type, are commonly used.

도 1a내지 도 1b에 도시된 바와 같이, 락 타입(lok type) 튜브피팅의 경우에는, 피팅몸체(10), 전방페롤(20), 후방페롤(30), 너트(40)로 구성되어 튜브(50)와 체결되며, 피팅(Fitting)은 전방페롤(20)과 후방페롤(30)의 조합으로 이루어진다. 또한, 전방페롤(20)과 너트(40) 사이에 위치하여 너트(40)의 조임으로 발생하는 마 찰저항을 받게 되는 후방페롤(30)은 설치환경과 그 물림기능을 향상시키기 위해 후방페롤(30)이 전방페롤(20)과 맞물리는 전단부(31)는 높은 내마모성과 내부식성이 요구된다.1A to 1B, in the case of a lok type tube fitting, the tube 10 includes a fitting body 10, a front ferrule 20, a rear ferrule 30, and a nut 40. 50), the fitting (Fitting) is made of a combination of the front ferrol 20 and the rear ferrol (30). In addition, the rear ferrol 30 is located between the front ferrol 20 and the nut 40 and subjected to frictional resistance generated by the tightening of the nut 40. 30, the front end portion 31 engaged with the front ferrol 20 requires high wear resistance and corrosion resistance.

또한, 도 2a내지 도 2b에 도시된 바와 같이, 바이트 타입(bite type)의 튜브피팅의 경우에는 피팅몸체(10), 바이트 타입 슬리브(60), 너트(40)로 구성되어 튜브(50)와 체결되며, 피팅은(Fitting)은 하나의 페롤인 슬리브(60)의 튜브 물림으로 이루어지며,In addition, as shown in Fig. 2a to 2b, in the case of the tube fitting of the bite type (bite type), the fitting body 10, the bite type sleeve 60, the nut 40 is composed of the tube 50 and The fitting is made of a tube bite of the sleeve 60 which is one ferrule,

도 3a내지 도 3b에 도시된 바와 같이, 딘 타입(din type)의 튜브피팅의 경우에는 상기 바이트 타입과 구조나 기능은 동일하나, 딘 타입 슬리브(70)의 종단의 모양이 이단으로 형성되어 이중의 튜브 물림이 이루어지는 점에서 상기 바이트 타입과 차이가 있다.As shown in FIGS. 3A to 3B, in the case of a din type tube fitting, the bite structure and the function are the same as those of the bite type, but the end of the din type sleeve 70 is formed in two stages. There is a difference from the bite type in that the tube bite is made.

튜브피팅의 경우, 이상과 같은 튜브피팅용 연결부재인 상기 전·후방 페롤이나, 슬리브들의 튜브 물림성에 의하여 튜브피팅의 이음성능이 좌우되며, 이에 따라, 상기 튜브피팅용 연결부재에는 높은 내마모성과 내부식성이 요구된다. 이를 위해 상기 연결부재에 대해서는 형상을 제조한 후 별도의 표면 열처리 공정을 거치게 되는데, 통상적인 열처리 공정은, 침탄질화공정, 확산공정, 질화공정, 연마공정, 및 검사후 표면왁스 코팅공정의 순으로 열처리공정이 이루어진다.In the case of the tube fitting, the joint performance of the tube fitting is influenced by the tube biting properties of the front and rear ferrules or the sleeves as described above, and thus, the tube fitting connecting member has high wear resistance and resistance to corrosion. Corrosiveness is required. To this end, after the shape is manufactured for the connection member is subjected to a separate surface heat treatment process, a typical heat treatment process, in the order of carburizing nitriding process, diffusion process, nitriding process, polishing process, and surface wax coating process after inspection The heat treatment process takes place.

그러나, 종래의 침탄질화열처리의 경우, 750℃ ~ 900℃의 온도에서 30분 ~ 2시간 동안 염욕에서 열처리 후 공냉시에 후방페롤의 표면이 산화되어 부식되는 문 제점이 있었고, 또한 확산공정과 질화공정 후에도 후방페롤의 표면에 부식이 발생되며, 스테인레스강의 부동태 피막도 손상되어 내부식성이 저하되는 문제점이 있었다.However, in the case of conventional carburization and nitrification heat treatment, the surface of the rear ferrol is oxidized and corroded during air cooling after heat treatment in a salt bath at a temperature of 750 ° C. to 900 ° C. for 30 minutes to 2 hours. Corrosion occurs on the surface of the rear ferrol even after the process, and the passivation film of the stainless steel is also damaged, thereby reducing the corrosion resistance.

따라서, 본 발명의 목적은, 스테인레스강을 소재로 사용한 튜브피팅용 연결부재의 내마모성을 향상시킴과 동시에, 열처리 공정중 발생되는 상기 연결부재의 표면의 부식현상을 감소시켜 표면연마에 따른 작업공정을 단순화하고, 튜브의 물림성을 향상시키며, 스테인레스강으로 제조되는 상기 연결부재의 열처리 공정중 손상된 부동태 피막을 재생하여 내부식성을 향상시킨 고품질의 튜브피팅용 연결부재의 생산을 위한 열처리 제조방법을 제공하는 것이다.Accordingly, an object of the present invention is to improve the wear resistance of a tube fitting connecting member made of stainless steel, and at the same time reduce the corrosion of the surface of the connecting member generated during the heat treatment process to reduce the work process according to surface polishing. It provides a heat treatment manufacturing method for the production of high quality tube fitting connecting member which simplifies, improves the biteability of the tube and improves corrosion resistance by regenerating the passivation film damaged during the heat treatment process of the connecting member made of stainless steel. It is.

전술한 바와 같은 발명의 목적은, 스테인레스강을 소재로 사용한 튜브피팅용 연결부재의 열처리 제조방법에 있어서, 상기 연결부재의 표면에 대해 먼저, 침탄질화공정을 실시하고, 상기 침탄질화된 연결부재에 대해 탈탄 및 탈질화공정을 실시한 후, 상기 탈탄 및 탈질화공정된 연결부재의 전체 표면조도를 개선 시키기 위한 바렐연마공정을 실시하며, 상기 바렐연마공정을 실시한 연결부재에 대해 검사후 부동태처리공정을 실시하는 것을 특징으로 하며, The object of the invention as described above, in the method of manufacturing a heat treatment of the tube member connecting member using stainless steel as a material, first to the carburizing nitriding process on the surface of the connecting member, and to the carburized nitriding connection member After the decarburization and denitrification process, the barrel polishing process is performed to improve the overall surface roughness of the connection member subjected to the decarburization and denitrification process, and the passivation process is performed after the inspection of the connection member subjected to the barrel polishing process. Characterized in that,

본 발명의 바람직한 특징에 따르면, 상기 침탄질화공정(S1)은 복합열처리로 에서 질소(N2) 가스로 예열시킨 후, 400℃ ~ 550℃의 온도에서 50분 ~ 1시간 동안 질소(N2) 가스분위기에서 질화공정을 실시하고, 600℃ ~ 800℃에서 4 ~ 18시간 동안 질소(N2)와 암모니아(NH3) 및 프로판(C3H8) 가스, 또는, 질소(N2)와 암모니아(NH3) 및 이산화탄소(CO2) 가스로, 교반시켜 침탄질화공정을 하여 상기 연결부재의 표면 경화층 깊이 80μm ~ 180μm와 표면 비커스 경도 Hv450 ~ 800을 형성하도록 하며,According to a preferred feature of the invention, the carbo-nitriding process (S1) is nitrogen (N 2) while after pre-heated to a nitrogen (N 2) gas at a combined heat treatment, at a temperature of 400 ℃ ~ 550 ℃ 50 bun ~ 1 sigan The nitriding process is carried out in a gas atmosphere, and nitrogen (N 2 ) and ammonia (NH 3 ) and propane (C 3 H 8 ) gases for 4 to 18 hours at 600 ° C. to 800 ° C., or nitrogen (N 2 ) and ammonia (NH 3 ) and carbon dioxide (CO 2 ) gas, and stirring to give a carburizing nitriding process to form a surface hardened layer depth of 80μm ~ 180μm and surface Vickers hardness Hv450 ~ 800,

본 발명의 더 바람직한 특징에 따르면, 상기 탈탄 및 탈질화공정(S2)은 630℃ ~ 830℃에서, 2 ~ 8시간 동안 공기를 이용하여 탈탄을 시킨 후 질소(N2)로 냉각시켜 상기 연결부재의 표면 탈탄 및 탈질화층 깊이 5 ~ 50μm을 형성하도록 하고, According to a more preferred feature of the present invention, the decarburization and denitrification step (S2) at 630 ℃ ~ 830 ℃, decarburization using air for 2 to 8 hours and then cooled with nitrogen (N 2 ) to the connecting member Surface decarburization and denitrification layer depth of 5 to 50μm to form,

본 발명의 더욱 더 바람직한 특징에 따르면, 상기 바렐연마공정은 상기 연결부재를 표면조도 3 ~ 6μm Ra로 연마하는 것을 특징으로 하는 스테인레스강을 소재로 사용한 튜브피팅용 연결부재의 열처리 제조방법에 의해 달성된다.According to a further preferred feature of the present invention, the barrel polishing process is achieved by a heat treatment manufacturing method of the tube member connecting member using a stainless steel material, characterized in that to polish the connecting member to a surface roughness of 3 ~ 6μm Ra. do.

이하에는, 본 발명의 바람직한 실시예를 첨부도면을 참조하여 상세하게 설명하되 이는 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자가 발명을 용이하게 실시할 수 있을 정도로 상세하게 설명하기 위한 것이지 이로인해 본 발명의 기술적인 사상 및 범주가 한정되는 것을 의미하지는 않는다.Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, which are intended to explain in detail enough to enable those skilled in the art to easily practice the invention. It is not intended that the technical spirit and scope of the present invention be limited.

락 타입(lok type) 경우에는, 도 1a내지 1b에 도시된 바와 같이, 후방페롤의 전방부의 튜브에 대한 물림성을 좋게 하기 위하여 전체 동 도금후 전방부만을 부분박리 한 후 다음의 열처리 공정을 실시하게 되며, In the case of the lok type, as shown in Figs. 1A to 1B, after the entire copper plating, only the front part is peeled off and the following heat treatment process is performed in order to improve the biting property of the front tube of the rear ferrule. Will be

바이트 타입(bite type)과 딘 타입(din type) 경우에는, 하나의 페롤인 슬리브만이 물림기능을 하게 되어 슬리브 전체 부위에 대해 다음의 열처리 공정을 실시하게 된다. In case of bite type and din type, only one ferrole sleeve has a bite function, and the following heat treatment process is performed on the entire portion of the sleeve.

도 7에 도시된 바와 같이, 본 발명에 따른 스테인레스강을 소재로 사용한 튜브피팅용 연결부재의 열처리 제조방법을 실시공정에 따라 상세히 설명하면 다음과 같다.As illustrated in FIG. 7, a method for manufacturing a heat treatment of a connection member for tube fitting using stainless steel according to the present invention will be described in detail according to an embodiment.

제 1공정 : 침탄질화공정(S1)Step 1: Carburization Nitriding Process (S1)

스테인레스강을 소재로 사용한 튜브피팅용 연결부재의 표면에 대해 먼저, 복합열처리로에서 질소(N2) 가스로 서서히 예열시킨 후, 400℃ ~ 550℃의 온도에서 50분 ~ 1시간 동안 질소(N2) 가스분위기에서 질화공정을 실시하고, 다시 600℃ ~ 800℃에서, 4 ~ 18시간 동안 질소(N2)와 암모니아(NH3) 및 프로판(C3H8) 가스, 또는, 질소(N2)와 암모니아(NH3) 및 이산화탄소(CO2) 가스로, 교반시켜 침탄질화공정을 하여 상기 연결부재의 표면 경화층 깊이 80μm ~ 180μm와 표면 비커스 경도 Hv450 ~ 800을 형성하도록 한다.On the surface of the tube fitting connecting member using stainless steel as a material, first, preheated with nitrogen (N 2 ) gas gradually in the combined heat treatment furnace, and then nitrogen (N for 50 minutes to 1 hour at a temperature of 400 ° C. to 550 ° C. 2 ) Nitriding process in a gas atmosphere, and further nitrogen (N 2 ) and ammonia (NH 3 ) and propane (C 3 H 8 ) gas or nitrogen (N) at 600 ° C. to 800 ° C. for 4 to 18 hours. 2 ) and ammonia (NH 3 ) and carbon dioxide (CO 2 ) gas to stir to form a carburizing nitriding process to form a surface hardened layer depth of 80μm ~ 180μm and surface Vickers hardness Hv450 ~ 800.

제 2공정 : 탈탄 및 탈질화공정(S2)Second Process: Decarburization and Denitrification Process (S2)

상기 침탄질화된 연결부재를 630℃ ~ 830℃에서, 상기 복합열처리로에서 2 ~ 8시간 동안 공기를 이용하여 상기 연결부재의 표면을 탈탄 시키고, 질소(N2)로 냉각시켜 상기 연결부재의 탈탄 및 탈질화층 깊이 5 ~ 50μm을 형성하도록 한다.The carburized nitriding connection member is decarburized at 630 ° C. to 830 ° C. in the composite heat treatment furnace for 2 to 8 hours using air for decarburizing the surface of the connection member and cooling with nitrogen (N 2 ). And a denitrification layer depth of 5 to 50 μm.

제 3공정 : 바렐연마공정(S3)Third process: barrel polishing process (S3)

상기 탈탄 및 탈질화공정을 거친 연결부재를 표면조도 3 ~ 6μm Ra로 연마한다. 상기 가스분위기에서 침탄질화를 실시하여 표면의 부식현상이 현저히 줄어들어 상기 바렐연마공정의 시간을 단축할 수 있으며, 연마공정 시간의 단축으로 상기 연결부재의 연마에 따른 마모량이 줄어들어 모서리 각이 라운딩 되지 않으므로 상기 튜브피팅용 연결부재의 튜브 물림기능이 향상된다.The connection member, which has undergone the decarburization and denitrification, is ground to a surface roughness of 3 to 6 μm Ra. By carburizing and nitriding in the gas atmosphere, the corrosion of the surface is significantly reduced, thereby reducing the time of the barrel polishing process, and by reducing the polishing process time, the amount of wear due to the polishing of the connecting member is reduced, so that the corner angle is not rounded. The tube biting function of the tube fitting connecting member is improved.

제 4공정 : 검사후 부동태피막 재생공정(S4)4th process: Passive film regeneration process after inspection (S4)

상기 열처리 제조공정을 거친 후, 상기 튜브피팅용 연결부재의 내마모성과 내부식성이 요구조건을 만족하는지 검사한 후 상기 열처리 공정중 손상된 부동태피막을 재생시키기 위하여 5% 크롬산 용액에 15분간 담근 후 건조시켜 0.01 ~ 0,05μm의 부동태피막층을 형성시킨다,After the heat-treatment manufacturing process, after inspecting whether the abrasion resistance and corrosion resistance of the tube fitting connecting member satisfies the requirements, soaked in 5% chromic acid solution for 15 minutes in order to regenerate the passivation film damaged during the heat treatment process and dried To form a passivation layer of 0.01 ~ 0,05μm,

이상에서 설명된 열처리 제조방법에 의하여, 종래 염욕에서 실시하던 침탄질 화공정을 혼합가스로 실시하고, 확산공정과 질화공정을 생략하고 탈탄공정을 실시하여 열처리 과정에서 발생하던 표면 부식현상을 현저히 감소 시키며, 부동태 피막의 손상을 최소화하여 내부식성을 향상 시킬 수 있게 된다. 상기 열처리 제조방법에 의하여 제조된 튜브피팅용 연결부재에 대해 100시간 동안의 염수 분무 시험을 실시한 결과 표면 부식현상이 현저히 줄어들어 내부식성이 월등히 향상되었음을 확인할 수 있었다.According to the heat treatment manufacturing method described above, the carburizing nitriding process, which has been conventionally performed in a salt bath, is carried out with a mixed gas, and the diffusion process and the nitriding process are omitted, and the decarburization process is performed to significantly reduce the surface corrosion occurring during the heat treatment process. In addition, the corrosion resistance can be improved by minimizing the damage of the passivation film. 100 hours of salt spray test was performed on the connection member for the tube fitting manufactured by the heat treatment manufacturing method, and it was confirmed that the surface corrosion phenomenon was significantly reduced and the corrosion resistance was greatly improved.

이상에서와 같이, 본 발명에 따른 스테인레스강을 소재로 사용한 튜브피팅용 연결부재의 열처리 제조방법에 의하면, 종래 염욕에서 실시되던 침탄질화공정을 혼합가스로 실시하고, 확산공정과 요소비료를 투입하여 액체내에서 실시하던 질화공정을 생략함으로써, 열처리 과정에서 발생되던 표면 부식현상을 현저히 감소시킬 수 있으며, 부식현상의 감소로 바렐연마공정에 소요되는 시간을 단축시킬 수 있고, 연마공정의 시간단축에 따른 마모량의 감소로 튜브피팅용 연결부재의 모서리 각이 라운딩 되지 않아 튜브의 물림기능이 향상되며, 더불어 탈탄 및 탈질화공정 후 부동태피막 재생공정을 실시함으로써, 손상된 스테인레스강의 부동태 피막을 재생시켜 튜브피팅용 연결부재의 튜브의 물림기능과 내부식성이 월등히 향상된 고품질의 튜브피팅용 연결부재을 생산할 수 있게 된다.As described above, according to the heat treatment manufacturing method of the tube fitting connecting member using stainless steel according to the present invention, the carburizing and nitriding process, which was conventionally performed in a salt bath, was carried out with a mixed gas, and a diffusion process and urea fertilizer were added. By omitting the nitriding process performed in the liquid, the surface corrosion phenomenon generated during the heat treatment process can be significantly reduced, and the time required for the barrel polishing process can be shortened due to the reduction of the corrosion process. Due to the reduction of wear, the corner angle of the tube fitting connecting member is not rounded, which improves the bite function of the tube. Also, by regenerating the passivation film after decarburization and denitrification, the passive film of damaged stainless steel is regenerated and the tube fitting High quality tube fittings with significantly improved bite and corrosion resistance The connecting member can be produced.

Claims (5)

스테인레스강을 소재로 사용한 튜브피팅용 연결부재의 열처리 제조방법에 있어서,In the heat treatment manufacturing method of the tube fitting connecting member using stainless steel as a material, 상기 연결부재의 표면에 대해 먼저, 침탄질화공정(S1)을 실시하고, 상기 침탄질화된 연결부재에 대해 탈탄 및 탈질화공정(S2)을 실시한 후, 상기 탈탄 및 탈질화공정된 연결부재의 전체 표면조도를 개선 시키기 위한 바렐연마공정(S3)을 실시하며, 상기 바렐연마공정을 실시한 연결부재에 대해 검사후 부동태피막 재생공정(S4)을 실시하는 것을 특징으로 하는 스테인레스강을 소재로 사용한 튜브피팅용 연결부재의 열처리 제조방법.On the surface of the connecting member, first, a carburization-nitridation step (S1) is performed, and a decarburization and denitrification step (S2) is performed on the carburization-nitridation connection member, and then the entire decarburization and denitrification process is performed on the entire connection member. A barrel fitting process (S3) is performed to improve the surface roughness, and the tube fitting using stainless steel as a material is characterized by performing the passive film regeneration process (S4) after inspection of the connection member subjected to the barrel polishing process. Method for manufacturing heat treatment of connecting members 제 1항에 있어서,The method of claim 1, 침탄질화공정(S1)은,Carburizing nitriding step (S1), 복합열처리로에서 질소(N2) 가스로 예열시킨 후, 400℃ ~ 550℃의 온도에서 50분 ~ 1시간 동안 질소(N2) 가스분위기에서 질화공정을 실시하고, 600℃ ~ 800℃에서 4 ~ 18시간 동안 질소(N2)와 암모니아(NH3) 및 프로판(C3H8) 가스, 또는, 질소(N2)와 암모니아(NH3) 및 이산화탄소(CO2) 가스로, 교반시켜 침탄질화공정을 하여 상기 연결부재의 표면 경화층 깊이 80μm ~ 180μm와 표면 비커스 경도 Hv450 ~ 800을 형성하도록 함을 특징으로 하는 스테인레스강을 소재로 사용한 튜브피팅용 연결부재의 열처리 제조방법.After preheating with nitrogen (N 2 ) gas in a combined heat treatment furnace, the nitriding process is carried out in a nitrogen (N 2 ) gas atmosphere at a temperature of 400 ° C. to 550 ° C. for 50 minutes to 1 hour, and at 600 ° C. to 800 ° C. Carburizing by stirring with nitrogen (N 2 ) and ammonia (NH 3 ) and propane (C 3 H 8 ) gas or with nitrogen (N 2 ) and ammonia (NH 3 ) and carbon dioxide (CO 2 ) gas for 18 hours A process for producing heat treatment of a tube fitting connecting member using stainless steel, characterized in that to form a nitriding process to form a surface hardened layer depth 80μm ~ 180μm and surface Vickers hardness Hv450 ~ 800 of the connection member. 제 1항에 있어서,The method of claim 1, 탈탄 및 탈질화공정(S2)은,Decarburization and denitrification process (S2), 630℃ ~ 830℃에서, 2 ~ 8시간 동안 공기를 이용하여 탈탄을 시킨 후 질소(N2)로 냉각시켜 상기 연결부재의 표면 탈탄 및 탈질화층 깊이 5 ~ 50μm을 형성하도록 함을 특징으로 하는 스테인레스강을 소재로 사용한 튜브피팅용 연결부재의 열처리 제조방법.At 630 ° C. to 830 ° C., after decarburization using air for 2 to 8 hours, cooling with nitrogen (N 2 ) to form a surface decarburization and denitrification layer depth of 5 to 50 μm of the connection member. Heat treatment manufacturing method of connecting member for tube fitting using steel as a material. 제 1항에 있어서,The method of claim 1, 바렐연마공정(S3)은,Barrel polishing process (S3), 상기 연결부재를 표면조도 3 ~ 6μm Ra로 연마하는 것을 특징으로 하는 스테인레스강을 소재로 사용한 튜브피팅용 연결부재의 열처리 제조방법.Heat treatment manufacturing method of the tube member connecting member using a stainless steel material, characterized in that for polishing the connection member with a surface roughness of 3 ~ 6μm Ra. 제 1항에 있어서,The method of claim 1, 부동태피막 재생공정(S4)은,Passive film regeneration step (S4), 상기 연결부재의 표면에 0.01 ~ 0.05μm의 부동태피막을 재생시키는 것을 특징으로 하는 스테인레스강을 소재로 사용한 튜브피팅용 연결부재의 열처리 제제방법.Heat treatment formulation method of the tube member connecting member using a stainless steel material, characterized in that for regenerating the passivating film of 0.01 ~ 0.05μm on the surface of the connecting member.
KR1020070009962A 2007-01-31 2007-01-31 The heat treatment process of connecting member made of stainless steel on fitting tube KR100807807B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020070009962A KR100807807B1 (en) 2007-01-31 2007-01-31 The heat treatment process of connecting member made of stainless steel on fitting tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020070009962A KR100807807B1 (en) 2007-01-31 2007-01-31 The heat treatment process of connecting member made of stainless steel on fitting tube

Publications (1)

Publication Number Publication Date
KR100807807B1 true KR100807807B1 (en) 2008-02-26

Family

ID=39383473

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020070009962A KR100807807B1 (en) 2007-01-31 2007-01-31 The heat treatment process of connecting member made of stainless steel on fitting tube

Country Status (1)

Country Link
KR (1) KR100807807B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101119498B1 (en) * 2009-02-09 2012-03-13 김영희 Method for Manufacturing High Corrosion Resistant Steel Materials and Components

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR930003031A (en) * 1991-07-20 1993-02-23 강진구 Disc drive device of optical disc player
KR20040043324A (en) * 2002-11-18 2004-05-24 에프에이지베어링코리아유한회사 steel for bearing and heat treatment method thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR930003031A (en) * 1991-07-20 1993-02-23 강진구 Disc drive device of optical disc player
KR20040043324A (en) * 2002-11-18 2004-05-24 에프에이지베어링코리아유한회사 steel for bearing and heat treatment method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101119498B1 (en) * 2009-02-09 2012-03-13 김영희 Method for Manufacturing High Corrosion Resistant Steel Materials and Components

Similar Documents

Publication Publication Date Title
JPH0344457A (en) Method for nitriding steel
KR20110104631A (en) Colored austenitic stainless steel article and manufacturing method of the same with excellent corrosion resistance and high surface hardness
CN110438319B (en) Heat treatment method of sliding block
KR20210019435A (en) Chemical activation of self-passivating metals
CN107245691B (en) Surface strengthening method for metal material composite heat treatment
JP3961390B2 (en) Surface carbonitrided stainless steel parts with excellent wear resistance and manufacturing method thereof
CN109183045B (en) Heat treatment process for automobile spindle
CN101392361A (en) Nitrocarburizing method of martensitic stainless steel and preparation method thereof
CN105950834A (en) Surface treatment process of stainless steel machined product
KR100807807B1 (en) The heat treatment process of connecting member made of stainless steel on fitting tube
KR100905271B1 (en) Method for treat of Heat resisting steel by Gas nitriding
US5419948A (en) Hard austenitic stainless steel screw and a method for manufacturing the same
KR101866754B1 (en) Carburizing Method in Low-Pressure Range
CN110819936B (en) Corrosion-resistant soft nitriding process method in ammonia-nitrogen-carbon dioxide atmosphere
KR20170052457A (en) Low-Temperature Vacuum Carburizing Method
KR101866752B1 (en) Low-Temperature Vacuum Carburizing Method
KR101614259B1 (en) Method for formation of hardened layer on martensitic precipitation-hardening stainless steel by the application of in-situ combination of aging treatment and plasma nitrocaburizing treatment
CN109695014B (en) Dental plate surface nitriding treatment process
CN109811295B (en) Vacuum carburizing furnace 750 ℃ low-temperature carburizing process for precision parts
JP5558296B2 (en) Gas soft nitriding method
JPH06108223A (en) Pre-treatment of carburizing cr-containing steel-made member
KR100837789B1 (en) Nitriding treatment method
JP2733608B2 (en) Bearing steel and method of manufacturing the same
KR102264958B1 (en) Pretreatment Solution for Soot Reduction and Low-Temperature Vacuum Carburizing Method Using the Same
JP2918765B2 (en) Nickel alloy products whose surface is nitrided and hardened

Legal Events

Date Code Title Description
A201 Request for examination
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
LAPS Lapse due to unpaid annual fee