Dear All,

I am performing a design using ASME VIII Div.1 Code and
I am keen to understand if the bolting material ASTM A 453 660 Gr. A & B comply with the NACE 0103 and 0175 requirements ( above all regarding the hardness limit).

I have to design internal bolting in contact with H2S enviroment. I should also try to avoid high strength material BUT the pressure is PRETTY HIGH and the conventional stainless steel material such as B8M, B8MA, B8T do not help me since the relating allowable stress are low with the consequent BIG DIAMETER BOLTS RESULTS.....
(in addition some od them are limited insize).

That is why I would like to use A 453 660 boltings which allow to obtain smaller diameter.

I unsuccesfully tried to find allowable stresses higher than A 453 material but it seems no way than the use of A 453.

many thanks in advance for your kind attention and help.

GENGI