SAE equivalent to ASTM A193-B16

[SMF1964]

Does anybody have a listing of what the equivalent SAE grade for A193-B16 bolt material? The material is 1Cr-0.5Mo-0.25V with (roughly) 0.4 Carbon. A number of my SAE charts don't list it but I'm fairly certain my charts are not complete.

 

[unclesyd]

Someone may correct me but as far as I know there is no equivalent. Even though the same materials could be used for manufacture the required higher tempering temperature (1100°F)of B-16 is the main difference. Some of the materials used for Grade 8 will fall off appreciably in strength if tempered at this temperature. Grade 8 bolts don't have to have a pedigree as required of B-16.

 

[metengr]

unclesyd is correct. The SAE steel bolting grades are not typically used in elevated temperature service because SAE J429 Grade 8 or 8.1 do not contain vanadium in comparison to ASTM A 193 Grade B16. The vanadium addition to the Cr-Mo base alloy provides elevated temperature strength and increased creep resistance.

 

[SMF1964]

Yeah, I had a copy of J429 and it only listed carbon steels (not suitable for 1000F piping flange bolts). I did not know if there was another spec that listed CrMoV steels in it.

 

[TVP]

There are some SAE AMS standards for CrMoV steels (6302, 6303, 6428, 6430, etc.) but none of them exactly match the composition of given in ASTM A 193.

 

[stanweld]

SAE AMS 6304H and 6305C,UNS K14675,0.95 Cr-0.55 Mo-0.30V (0.40-0.50 C) can be used as fasteners up to 1000 F have chemistry very similar to B16. It is up to the user of these materials to additionally specify heat treatment and minimimum/maximum mechanical properties and hardness as well as thread design etc.

 

[unclesyd]

Why not stay with the Code approved B-16 as the other materials are going to be more expensive and harder to find.
When you add the AMS Spec to anything you increase the price and in the case of most fasteners you could easily double the price.

At the present time it is a sellers market. Prices are increasing almost daily. You don't want to start putting adders on any fasteners at the present time.

 

[SMF1964]

This has become a dead issue, it appears, as B31.1 lists ASTM grade alloys, not SAE. I'm not sure why they wanted SAE grades, unless it was a convenience issue for ordering.