용접맨
2008-01-10 16:47:24
2
714
테크노넷에서 유용한 정보를 많이 얻고 있어 항상 고맙게 생각하는 사이트 입니다.
다름이 아니오라 SUS347 & SUS321 강관(두께 20~30t)을 용접 후 고용화 열처리를 실시하는데(1050℃-1Hr/inch-수냉) 용접직후에는 균열 발생이 없으나 고용화 열처리를 실시한 후에는 용접부 균열이 관찰되어집니다.
고용화 열처리 조건이 잘못 되어서 그런지 자문을 좀 구합니다.
그리고 스테인리스 강판의 외관 및 광택, 내부 잔류 응력 제거를 위하여 광휘소둔열처리를 실시하는것으로 알고 있는데 문헌을 보면 SUS321 & SUS316LN 강재같은 경우는 광휘소둔열처리가 부적합하다고 하는데 이유가 무엇인지 알고 싶습니다.
다름이 아니오라 SUS347 & SUS321 강관(두께 20~30t)을 용접 후 고용화 열처리를 실시하는데(1050℃-1Hr/inch-수냉) 용접직후에는 균열 발생이 없으나 고용화 열처리를 실시한 후에는 용접부 균열이 관찰되어집니다.
고용화 열처리 조건이 잘못 되어서 그런지 자문을 좀 구합니다.
그리고 스테인리스 강판의 외관 및 광택, 내부 잔류 응력 제거를 위하여 광휘소둔열처리를 실시하는것으로 알고 있는데 문헌을 보면 SUS321 & SUS316LN 강재같은 경우는 광휘소둔열처리가 부적합하다고 하는데 이유가 무엇인지 알고 싶습니다.
I believe the weldments contain multiaxial residual stresses (as elastic strain) at/above uniaxial yield strength level.
Please find the following case studies.
[References] Reheat (or Stress Relief or Stress Relaxation) Crack in Stabilized ASS
- API RP571, 4.2.19 Reheat Cracking, 2003
- R. J. Christoffel, Cracking in type 347 heat-affected zone during stress relaxation, Welding Research Supplement, p-251s, Jun. 1962
- WRC 150, R.W. Fawley and M. Prager; J.S. Carlton and M. Prager; M. Prager and G. Sines, Recent Studies of Cracking During Postwelding Heat Treatment of Nickel-Base Alloys: Evaluating the Resistance of Rene 41 to Strain-Age Cracking; Variable Influencing the Strain-Age Cracking and Mechan, 1970
- WRC 211, C.F. Meitzner , Stress-Relief Cracking in Steel Weldments, 1975
- R. Gommans, Comparison of Characteristics and Properties of New High Temperature Austenitic Steels, Stainless Steels World, p75-81, Oct. 1999
- A. Dhooge, Survey on reheat Cracking in Austenitic Stainless Steel and Ni Based Alloys, Welding in the World, 41 (1998), p206-219
- ASM Metal Handbook, Properties of Metals, Vol.4, p504, 1961
- ASTM Special Technical Publication No. 124, Report on the Elevated Properties of Stainless Steels, p6, 1952
- W. T. Delong, Ferrite Fissuring in Austenitic Stainless Steel Weld Metal, Welding Research Supplement to the Welding Journal, p241-246, Aug. 1975
- NiDI Publication, Series No. 9004, High Temperature Characteristics of Stainless Steels, 1979
- L Li and R. W. Messler, Jr., Stress Relaxation Study of HAZ Reheat Cracking in Type 347 SS, Welding Research Supplement to The Welding Journal, p137-144, June 2000
- Erich Folkard, Welding Metallurgy of Stainless Steels, Revised Translation: Springer Verlag New York, p108, 136, and 221, 1984
- J. J. Smith, Influence of Microstructure and Composition on the Mechanical Properties of Some AISI 300 Series Weld Metals, International Materials Review, Vol. 38, No. 1, p31 and 47, 1993
- R.D. Thomas, HAZ Cracking in Thick Section of Austenitic Stainless Steels-Part II, Supplement to the Welding Journal, p364-365, Dec. 1984
- Edition Welding Institute, Session 12: Postweld Treatment - Evaluation of PWHT cracking in nickel-based alloys and stainless steels,
- Hiroshi Yamamoto, Reheat cracking sensitivity and hydrogen effect on mechanical properties of type 347 stainless steel weld metal, ASME PVP-vol.380, 1998
- Larry J. Barley, The keys to welding corrosion resistant austenitic stainless steels, Welding Journal, p57, Nov. 1998
- M. Chabaud-Reytier, L. Allais, C. Caes, P. Dubuisson and A. Pineau, Mechanisms of stress relief cracking in titanium stabilized austenitic stainless steel, Journal of Nuclear Materials, Volume 323, Issue 1, 15, Pages 123-137, November 2003
Please find the following case studies.
[References] Reheat (or Stress Relief or Stress Relaxation) Crack in Stabilized ASS
- API RP571, 4.2.19 Reheat Cracking, 2003
- R. J. Christoffel, Cracking in type 347 heat-affected zone during stress relaxation, Welding Research Supplement, p-251s, Jun. 1962
- WRC 150, R.W. Fawley and M. Prager; J.S. Carlton and M. Prager; M. Prager and G. Sines, Recent Studies of Cracking During Postwelding Heat Treatment of Nickel-Base Alloys: Evaluating the Resistance of Rene 41 to Strain-Age Cracking; Variable Influencing the Strain-Age Cracking and Mechan, 1970
- WRC 211, C.F. Meitzner , Stress-Relief Cracking in Steel Weldments, 1975
- R. Gommans, Comparison of Characteristics and Properties of New High Temperature Austenitic Steels, Stainless Steels World, p75-81, Oct. 1999
- A. Dhooge, Survey on reheat Cracking in Austenitic Stainless Steel and Ni Based Alloys, Welding in the World, 41 (1998), p206-219
- ASM Metal Handbook, Properties of Metals, Vol.4, p504, 1961
- ASTM Special Technical Publication No. 124, Report on the Elevated Properties of Stainless Steels, p6, 1952
- W. T. Delong, Ferrite Fissuring in Austenitic Stainless Steel Weld Metal, Welding Research Supplement to the Welding Journal, p241-246, Aug. 1975
- NiDI Publication, Series No. 9004, High Temperature Characteristics of Stainless Steels, 1979
- L Li and R. W. Messler, Jr., Stress Relaxation Study of HAZ Reheat Cracking in Type 347 SS, Welding Research Supplement to The Welding Journal, p137-144, June 2000
- Erich Folkard, Welding Metallurgy of Stainless Steels, Revised Translation: Springer Verlag New York, p108, 136, and 221, 1984
- J. J. Smith, Influence of Microstructure and Composition on the Mechanical Properties of Some AISI 300 Series Weld Metals, International Materials Review, Vol. 38, No. 1, p31 and 47, 1993
- R.D. Thomas, HAZ Cracking in Thick Section of Austenitic Stainless Steels-Part II, Supplement to the Welding Journal, p364-365, Dec. 1984
- Edition Welding Institute, Session 12: Postweld Treatment - Evaluation of PWHT cracking in nickel-based alloys and stainless steels,
- Hiroshi Yamamoto, Reheat cracking sensitivity and hydrogen effect on mechanical properties of type 347 stainless steel weld metal, ASME PVP-vol.380, 1998
- Larry J. Barley, The keys to welding corrosion resistant austenitic stainless steels, Welding Journal, p57, Nov. 1998
- M. Chabaud-Reytier, L. Allais, C. Caes, P. Dubuisson and A. Pineau, Mechanisms of stress relief cracking in titanium stabilized austenitic stainless steel, Journal of Nuclear Materials, Volume 323, Issue 1, 15, Pages 123-137, November 2003
공지사항
그 보다는 용접과정에서 재열균열이 발생했을 가능성이 더 많아 보입니다.
물론 정확한 것은 균열이 발생한 단면을 조사해 보면 확인이 가능하겠지요.
두번째 질문하신 내용은 관련 문헌을 첨부해서 추가 질의해 주세요
아마도 일반적인 내용보다는 뭔가 다른 이유가 있을 것 같습니다.
광휘열처리는 수소 혹은 헬륨 등이 채워진 환경에서 실시하여 강재 표면에 산화물이 생기지 않도록 하는데, 그렇다고 해서 문제가 생긴다는 얘기는 뭔가 좀 특별한 얘기를 주제로 하는 것 같네요.