Galling Issue

[Erkamal]

Hi Dear All,
I am working in valve industry.

Input like : Design pressure 5000 PSI, Temp. Up 10 175Deg .C. I have uplex body. material is ASTM A182-F51( UNS S31800) .i am worrying about bolting cause galling issue. what type of material should i use? i am reffering ASTM A 193, ASTM A 453,ASTM 449. but also. but i am not getting ideal from it. so can anybody help me on this matter?

 

[CoryPad]

For your application, you could consider a duplex fastener material such as UNS S31803 according to ASTM A1082. You may want to consider a lubricant to prevent galling. Lubricant options include various anti-seize compounds manually applied to the fasteners (e.g. FastLUBE AG) or a pre-applied dry-film lubricant (e.g. Molykote) or a pre-applied PTFE-type coating (e.g. Xylan).

 

[ctopher]

Also see thread404-367508

Chris, CSWA
SolidWorks 14
ctopher's home
SolidWorks Legion

 

[Erkamal]

Thx, to give me answer on my question.
it will be very useful for me.

Have you any idea on below point.

In Api 6A, they have suggested only ASTM 193,194,320, and 453 for bolting. If i will use ASTM 1082 or nitronic 60 , is there any issue relate to API 6 A standard? lIke can i use or not?

 

[btrueblood]

You can purchase Nitronic 60 fasteners meeting ASTM A193. I believe you would specify Grade B8S, either Class 1C or 1D.