Differencies between ASTM A320 L7M and ASTM A320 L7
Differencies between ASTM A320 L7M and ASTM A320 L7
(OP)
hi, to all.
I'm interested to know if there are differencies between ASTM A320-L7M and L7.I'm selecting bolts and nuts for Low Temp Valves. About their differencies i have found that L7 are mechanically better than L7M and also that L7M are in accordance to NACE requiremnts. Tis means that L7M can be considered NACE?
I have also noted, for example that comapny as Shell uses indistinctly for sour and not sour always ASTM A 320 L7M.
Thanks for all.
Best Regards Vincenzo
I'm interested to know if there are differencies between ASTM A320-L7M and L7.I'm selecting bolts and nuts for Low Temp Valves. About their differencies i have found that L7 are mechanically better than L7M and also that L7M are in accordance to NACE requiremnts. Tis means that L7M can be considered NACE?
I have also noted, for example that comapny as Shell uses indistinctly for sour and not sour always ASTM A 320 L7M.
Thanks for all.
Best Regards Vincenzo





RE: Differencies between ASTM A320 L7M and ASTM A320 L7
RE: Differencies between ASTM A320 L7M and ASTM A320 L7
Thanks for your help/explanation i want to attach a good document that i have found on web about Nace Stud Bolts Classes and API requirements in wich it is clear when the L7M or 7M is necessary instead L7 or 7 grades.
Nace after 1997 had eliminated the classes and now speaks only about h2s presence or not.
For these reasons the stud and bolt Classes 1 and 2 means the use of L7M and 7M grades while for the Classes 3 and 4 it is not necessary the use of a NACE material (h2s not present)so are suitables 7M and 7 grades rispectively for ASTM A320 and ASTM A194.
Thaks for all i hope that the attached document is usefull not only for me but to the other peopole.
With my best regards Vincenzo Saviello.