METHOD FOR POST-HEAT TREATMENT FOR REDUCING PRIMARY WATER STRESS CORROSION CRACKING IN DISSIMILAR WELD SO AS TO IMPROVE MICROSTRUCTURE OF MATERIAL

WIPO Patent Application WO/2018/070769

A1

The present invention relates to a method for post-heat treatment for reducing PWSCC in a dissimilar weld so as to improve the microstructure of a material, the method comprising: a step of heating the external surface of a dissimilar weld of a pipe to a temperature of 570℃ to 620℃; a step of maintaining the temperature of the heated state for 4 to 10 hours; and a step of having the inner surface of the dissimilar weld remain cool (at room temperature) by using cooling water or a sprinkler while the temperature of the outer surface of the weld is maintained at 570℃ to 620℃. The method produces a PWSCC resistance-increasing precipitate in the microstructure of the dissimilar weld and can prevent cracking therein and does not cause stainless steel sensitization.

WO/2008/061722	METHOD AND APPARATUS FOR THE HEAT TREATMENT OF WELDS
JP2015510452	A method of manufacturing steel components by flash butt welding, and components created using this method.
WO/2006/090889	HIGH-STRENGTH WELDED STEEL PIPE EXCELLENT IN HYDROGEN EMBRITTLEMENT CRACKING RESISTANCE OF WELD METAL AND PROCESS FOR PRODUCING THE SAME

OH SEUNG JIN (KR)
WON SE YOUL (KR)
LEE KYOUNG SOO (KR)

PCT/KR2017/011169

April 19, 2018

October 11, 2017

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KOREA HYDRO & NUCLEAR POWER CO (KR)

C21D9/50; B23K31/02; C21D9/08

KR20150131418A	2015-11-25
JP2005320626A	2005-11-17
JP2008105050A	2008-05-08
KR20110074136A	2011-06-30
JPH10339041A	1998-12-22

KIM, Yoon Bae (KR)

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