KR102512057B1 - 비접촉식 전해연마 공정을 포함하는 강관의 제조방법, 이로부터 제조되는 강관 - Google Patents
비접촉식 전해연마 공정을 포함하는 강관의 제조방법, 이로부터 제조되는 강관 Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F3/00—Electrolytic etching or polishing
- C25F3/16—Polishing
- C25F3/22—Polishing of heavy metals
- C25F3/24—Polishing of heavy metals of iron or steel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/08—Making tubes with welded or soldered seams
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- 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
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
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- 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
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
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- 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
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
- C23C14/14—Metallic material, boron or silicon
- C23C14/16—Metallic material, boron or silicon on metallic substrates or on substrates of boron or silicon
- C23C14/165—Metallic material, boron or silicon on metallic substrates or on substrates of boron or silicon by cathodic sputtering
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F7/00—Constructional parts, or assemblies thereof, of cells for electrolytic removal of material from objects; Servicing or operating
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Abstract
이러한 본 발명은, 강판를 재단하여 용접부가 형성된 튜브로 성형하는 조관단계; 튜브를 환원성 분위기에서 열처리하여 산화를 방지하는 광휘소둔단계; 열처리된 튜브를 재열처리하여 튜브와 용접부의 조직을 안정화시키는 재결정단계; 재결정된 튜브의 탄화 및 입계부식을 방지하는 급랭단계; 급랭된 튜브의 형태를 교정하는 교정단계; 교정된 튜브의 내면을 표면처리하는 전해연마단계;를 포함하고, 전해연마단계는, 표면처리용액이 수용되고 전극봉이 배치된 처리조를 준비하고, 튜브를 전극봉의 외부에 일정 간격 이격되게 설치한 후 전해연마함으로써, 튜브의 내면에 산화 박막을 형성하는 것을 특징으로 하는 비접촉식 전해연마 공정을 포함하는 강관의 제조방법, 이로부터 제조되는 강관을 기술적 요지로 한다.
Description
도 2는 본 발명에 따른 조관 과정을 나타낸 예시도.
도 3은 본 발명에 따른 승온코일라인 상에서 튜브가 재결정되는 모습을 나타낸 예시도.
도 4는 본 발명에 따른 스퍼터 건을 이용한 스퍼터링 증착 과정을 나타낸 예시도.
도 5는 본 발명에 따른 듀얼 스퍼터 건을 이용한 스퍼터링 증착 과정을 나타낸 예시도.
도 6은 본 발명에 따른 튜브 내면에 산화 박막이 형성되는 과정을 나타낸 예시도.
도 7은 본 발명에 따른 전극봉을 나타낸 예시도.
도 8은 본 발명에 따른 전해연마 시 전류밀도와 표면 거칠기 간의 상관관계를 나타낸 그래프.
도 9는 본 발명에 따른 전해연마 시 처리시간과 표면 거칠기 간의 상관관계를 나타낸 그래프.
도 10은 본 발명에 따른 전해연마 시 표면처리용액 온도와 표면 거칠기 간의 상관관계를 나타낸 그래프.
w1: 접합부
w2: 용접부
100: 승온코일라인
110: 나선형 코일
120: 직선형 코일
200: 스퍼터 건
210: 제1스퍼터 건
220: 제2스퍼터 건
300: 전극봉
310: 지그
Claims (8)
- 강판를 재단하여 용접부가 형성된 튜브로 성형하는 조관단계;
상기 튜브를 환원성 분위기에서 열처리하여 산화를 방지하는 광휘소둔단계;
상기 열처리된 튜브를 재열처리하여 상기 튜브와 상기 용접부를 재결정화시키는 재결정단계;
상기 재결정된 튜브의 탄화 및 입계부식을 방지하는 급랭단계;
상기 급랭된 튜브의 형태를 교정하는 교정단계; 및
상기 교정된 튜브의 내면을 표면처리하는 전해연마단계;를 포함하고,
상기 전해연마단계는,
표면처리용액이 수용되고 전극봉이 배치된 처리조를 준비하고, 상기 튜브를 상기 전극봉의 외부에 일정 간격 이격되게 설치한 후 전해연마함으로써, 상기 튜브의 내면에 산화 박막을 형성하되,
상기 급랭단계와 상기 교정단계의 사이에는,
1종 이상의 금속 분말을 스퍼터 건에 장착하고, 스퍼터 공간에 반응 가스를 유입하면서 상기 금속 분말에 전력을 인가하며 상기 스퍼터 공간에 플라즈마 분위기를 형성하여 상기 금속 분말을 스퍼터링함으로써, 상기 튜브의 외면에 금속 박막을 형성하는 스퍼터링단계;를 더 포함하고,
상기 급랭단계 이후 스퍼터링단계에서 스퍼터링하기 전에는,
상기 튜브의 표면에 레이저를 조사하여 마이크로 크기의 거칠기 패턴을 형성한 후, 상기 마이크로 크기의 거칠기 패턴 상에 전기화학적 에칭하여 나노 크기의 거칠기 패턴을 형성하여, 상기 튜브의 표면에 복합 구조의 패턴층을 형성하되,
상기 마이크로 크기의 거칠기 패턴은 2 ~ 11㎛ 크기의 거칠기(Surface roughness)를 가지는 패턴이고,
상기 나노 크기의 거칠기 패턴은 400 ~ 1600㎚ 크기의 거칠기(Surface roughness)를 가지는 패턴인 것을 특징으로 하는 비접촉식 전해연마 공정을 포함하는 강관의 제조방법. - 제1항에 있어서,
상기 튜브와 상기 전극봉 사이에 5 내지 10mm 범위의 이격 공간이 유지되도록, 상기 전극봉의 외면 둘레를 따라 지그가 설치되는 것을 특징으로 하는 비접촉식 전해연마 공정을 포함하는 강관의 제조방법. - 제1항에 있어서,
상기 전극봉은,
은(Ag), 구리(Cu) 및 백금(Pt)으로 이루어진 군으로부터 선택되는 1종 이상의 재질로 이루어지고, 300 내지 500mm 길이를 갖는 것을 특징으로 하는 비접촉식 전해연마 공정을 포함하는 강관의 제조방법. - 제1항에 있어서,
상기 표면처리용액은,
탈이온수 5 내지 15중량%, 황산 25 내지 35중량% 및 인산 55 내지 65중량%를 혼합하여 형성되는 것을 특징으로 하는 비접촉식 전해연마 공정을 포함하는 강관의 제조방법. - 삭제
- 제1항에 있어서,
상기 스퍼터링은,
상기 스퍼터 공간에 설치되는 제1스퍼터 건과 제2스퍼터 건을 포함하는 듀얼 스퍼터 건을 이용하여 실시되는 것을 특징으로 하는 비접촉식 전해연마 공정을 포함하는 강관의 제조방법. - 제6항에 있어서,
상기 튜브의 외면으로부터 상기 제1스퍼터 건 및 상기 제2스퍼터 건의 이격 거리를 제어하여 상기 박막의 두께가 조절되는 것을 특징으로 하는 비접촉식 전해연마 공정을 포함하는 강관의 제조방법. - 제1항 내지 제4항, 제6항 및 제7항 중 어느 한 항의 방법으로 제조되는 것을 특징으로 하는 강관.
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