Dears,

What is the allowable stress for B861/862 Gr 2H in ASME B31.3:2010 for varius temperatures ? I could not locate the same there. Titanium Grade 2 has 50/40 ksi as min Su/Sy at 20C, whereas grade 2H has 58/40 ksi as min Su/Sy at 20C. What is Su at temperaure for grade 2H ?

Is H class in Titanium is for pressure vessel application only?
If I get Su & Sy at temperature from Sec II D, can I use the same to infer the allowable stress for the same in B31.3 ?

What is the allowable stress the titanium piping users in PTA industries using since 2006 when grade 2H has been introduced in ASME ?

regards,

sam

It is not listed.

http://www.astm.org/Standards/B862.htm

http://www.astm.org/Standards/B861.htm

"Note 1—H grade material is identical to the corresponding numeric grade (that is, Grade 2H = Grade 2) except for the higher guaranteed minimum UTS, and may always be certified as meeting the requirements of its corresponding numeric grade. Grades 2H, 7H, 16H, and 26H are intended primarily for pressure vessel use.
The H grades were added in response to a user association request based on its study of over 5200 commercial Grade 2, 7, 16, and 26 test reports, where over 99 % met the 58 ksi minimum UTS."


I think that you should treat as unlisted material therefore better to stay out of this. You maybe noted that the use of this grade is not permited for Section I, Section III and Section IX.

Regards,