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"ASTM A193 Gr B7" Hydrochloric acid service

"ASTM A193 Gr B7" Hydrochloric acid service

"ASTM A193 Gr B7" Hydrochloric acid service

(OP)
Hi,
On a FRP tank for Hydrochloric acid 32% in ambient temperature, we proposed Hastelloy, but vendor says:"ASTM A193 Gr B7" for stud bolts. Which is better material?
(Outdoor tank, min Amb. Temp = minus 45 deg C)

Regards

RE: "ASTM A193 Gr B7" Hydrochloric acid service

Will the bolts be wet by the acid or fumes?  If so, they won't be bolts for long-they're low-alloy steel like 4140.  Which Hast. would be used?

RE: "ASTM A193 Gr B7" Hydrochloric acid service

B7 No; Hastelloy C Yes.  
We also use a lot of Silicon Bronze in this service for flange bolting, especially in the smaller sizes.

RE: "ASTM A193 Gr B7" Hydrochloric acid service

PTFE-coated B7 studs and 2H nuts are commonly used, temperature permitting.  Forget about Hastelloy bolting- $$$ and galling tendency will both be enormous.  

RE: "ASTM A193 Gr B7" Hydrochloric acid service

(OP)
Thanks. Your comment are very helpful.

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