유정길
2005-08-05 19:24:58
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nace mr0175 재질의 배관재 용접시 사용하여야 할 용접봉 사양을 알고 싶습니다.
You may have to consider the followings;
1. Is it correct the applicable standard, NACE MR0175?
Because more than 98% of needs in Korean industries including oversea projects are related in oil refinery plants, not oil & gas production.
2. What is your material?
Because the requirement is different per materials.
3. What is your concern in sour service? e.g., SSC or HIC (Blistering/Stepwise Cracking) or SOHIC
4. If you are concerning about oil refinery plants, the followings (Welding Point of View-Not base metal) are recommended.
4.1 To apply NACE MR0103-2003 (Only for SSC prevention of Several Materials)
(1) Hardness for base metal and weldments
(2) Carbon equivalent (Ceq) < 0.43%
(3) Ni content for base metal and weld metal : No restriction
4.2. To apply NACE publ.8X-194-1994 (For prevention of SSC or HIC or SOHIC of carbon steel only)
(1) All requirements in para.4.1
(2) Carbon equivalent (Ceq) <0.38% when V + Cb > 0.03% or each > 0.02%
(3) Strong NDE requirements -e.g., WFMT, UT on weldments
Please find the attachment for more detail information.
NACE Corrosion and Materials Selection/Design Specialist
thomaseun@hanmail.net (for Korean)
HydrogenDamage.pdf
1. Is it correct the applicable standard, NACE MR0175?
Because more than 98% of needs in Korean industries including oversea projects are related in oil refinery plants, not oil & gas production.
2. What is your material?
Because the requirement is different per materials.
3. What is your concern in sour service? e.g., SSC or HIC (Blistering/Stepwise Cracking) or SOHIC
4. If you are concerning about oil refinery plants, the followings (Welding Point of View-Not base metal) are recommended.
4.1 To apply NACE MR0103-2003 (Only for SSC prevention of Several Materials)
(1) Hardness for base metal and weldments
(2) Carbon equivalent (Ceq) < 0.43%
(3) Ni content for base metal and weld metal : No restriction
4.2. To apply NACE publ.8X-194-1994 (For prevention of SSC or HIC or SOHIC of carbon steel only)
(1) All requirements in para.4.1
(2) Carbon equivalent (Ceq) <0.38% when V + Cb > 0.03% or each > 0.02%
(3) Strong NDE requirements -e.g., WFMT, UT on weldments
Please find the attachment for more detail information.
NACE Corrosion and Materials Selection/Design Specialist
thomaseun@hanmail.net (for Korean)
HydrogenDamage.pdf
공지사항
Code상에는 Ni Content의 제한등이 언급되어 있지만, 예를 들어 A516-60을 용접한다고 하면, 그냥 E7016으로 용접하면 됩니다.
그냥 저수소계 용접봉을 구매하여 사용하시면 됩니다.
단, 용접부 경도 규정은 준수해야겠지요.