Sackchai According Table A-1 (basic allowable stresses in tension for metals) of ASME B31.3-2002, the minimum temperature for A333 Gr6 is –45ºC and for A333 Gr3 is –101ºC. You should consult ASTM A333-98 for impact test requirements of these materials. I only have ASTM A333-81 and at that time on table 5 the minimum impact test temperature for A333 Gr6 was –46ºC and for A333 Gr3 was –101ºC. If your material is for a work service above –45ºC and bellow 0ºC in this case I think you can use A336 Gr6. Regards Luis Marques

Luis / Sackchai I have posted information on impact properties for a question raised in this forum by Debasis Mitra and Gopal Sankar for A333 Grades 6, 3 & 7. just a few days back. This will give answer to your question. If the temperature of operation is likely to go to - 50 o C, A333 Grade 3 / 7 should be considered for the question asked by Sakchai from imapct strength requirements. Trust this is of help to you C.V.Srinivasan Nishi Engineers Pvt Ltd India Sept 20 E-mail:nishi@vsnl.com >Sackchai > >According Table A-1 (basic allowable stresses in tension for >metals) of ASME B31.3-2002, the minimum temperature for A333 >Gr6 is –45ºC and for A333 Gr3 is –101ºC. You should consult >ASTM A333-98 for impact test requirements of these >materials. I only have ASTM A333-81 and at that time on >table 5 the minimum impact test temperature for A333 Gr6 was >–46ºC and for A333 Gr3 was –101ºC. >If your material is for a work service above –45ºC and >bellow 0ºC in this case I think you can use A336 Gr6. > >Regards > >Luis Marques